Geografic-Information-System/gui/wxpython/psmap/frame.py

"""
@package psmap.frame

@brief GUI for ps.map

Classes:
 - frame::PsMapFrame
 - frame::PsMapBufferedWindow

(C) 2011-2012 by Anna Kratochvilova, and the GRASS Development Team
This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.

@author Anna Kratochvilova <kratochanna gmail.com> (bachelor's project)
@author Martin Landa <landa.martin gmail.com> (mentor)
"""

import os
import sys
if sys.version_info.major == 2:
    import Queue
else:
    import queue as Queue
from math import sin, cos, pi, sqrt

import wx

try:
    import wx.lib.agw.flatnotebook as fnb
except ImportError:
    import wx.lib.flatnotebook as fnb

import grass.script as grass

from core import globalvar
from gui_core.menu import Menu
from core.gconsole import CmdThread, EVT_CMD_DONE
from psmap.toolbars import PsMapToolbar
from core.gcmd import RunCommand, GError, GMessage
from core.settings import UserSettings
from core.utils import PilImageToWxImage
from gui_core.forms import GUI
from gui_core.dialogs import HyperlinkDialog
from gui_core.ghelp import ShowAboutDialog
from gui_core.wrap import ClientDC, PseudoDC, Rect, StockCursor, EmptyBitmap
from psmap.menudata import PsMapMenuData
from gui_core.toolbars import ToolSwitcher

from psmap.dialogs import *
from psmap.instructions import *
from psmap.utils import *


class PsMapFrame(wx.Frame):

    def __init__(self, parent=None, id=wx.ID_ANY,
                 title=_("GRASS GIS Cartographic Composer"), **kwargs):
        """Main window of ps.map GUI

        :param parent: parent window
        :param id: window id
        :param title: window title

        :param kwargs: wx.Frames' arguments
        """
        self.parent = parent

        wx.Frame.__init__(
            self,
            parent=parent,
            id=id,
            title=title,
            name="PsMap",
            **kwargs)
        self.SetIcon(
            wx.Icon(
                os.path.join(
                    globalvar.ICONDIR,
                    'grass.ico'),
                wx.BITMAP_TYPE_ICO))
        # menubar
        self.menubar = Menu(
            parent=self,
            model=PsMapMenuData().GetModel(
                separators=True))
        self.SetMenuBar(self.menubar)
        # toolbar

        self._toolSwitcher = ToolSwitcher()
        self.toolbar = PsMapToolbar(
            parent=self, toolSwitcher=self._toolSwitcher)
        # workaround for http://trac.wxwidgets.org/ticket/13888
        if sys.platform != 'darwin':
            self.SetToolBar(self.toolbar)

        self.iconsize = (16, 16)
        # satusbar
        self.statusbar = self.CreateStatusBar(number=1)

        # mouse attributes -- position on the screen, begin and end of
        # dragging, and type of drawing
        self.mouse = {
            'begin': [0, 0],  # screen coordinates
            'end': [0, 0],
            'use': "pointer",
        }
        # available cursors
        self.cursors = {
            "default": StockCursor(wx.CURSOR_ARROW),
            "cross": StockCursor(wx.CURSOR_CROSS),
            "hand": StockCursor(wx.CURSOR_HAND),
            "sizenwse": StockCursor(wx.CURSOR_SIZENWSE)
        }
        # pen and brush
        self.pen = {
            'paper': wx.Pen(colour="BLACK", width=1),
            'margins': wx.Pen(colour="GREY", width=1),
            'map': wx.Pen(colour=wx.Colour(86, 122, 17), width=2),
            'rasterLegend': wx.Pen(colour=wx.Colour(219, 216, 4), width=2),
            'vectorLegend': wx.Pen(colour=wx.Colour(219, 216, 4), width=2),
            'mapinfo': wx.Pen(colour=wx.Colour(5, 184, 249), width=2),
            'scalebar': wx.Pen(colour=wx.Colour(150, 150, 150), width=2),
            'image': wx.Pen(colour=wx.Colour(255, 150, 50), width=2),
            'northArrow': wx.Pen(colour=wx.Colour(200, 200, 200), width=2),
            'point': wx.Pen(colour=wx.Colour(100, 100, 100), width=2),
            'line': wx.Pen(colour=wx.Colour(0, 0, 0), width=2),
            'box': wx.Pen(colour='RED', width=2, style=wx.SHORT_DASH),
            'select': wx.Pen(colour='BLACK', width=1, style=wx.SHORT_DASH),
            'resize': wx.Pen(colour='BLACK', width=1)
        }
        self.brush = {
            'paper': wx.WHITE_BRUSH,
            'margins': wx.TRANSPARENT_BRUSH,
            'map': wx.Brush(wx.Colour(151, 214, 90)),
            'rasterLegend': wx.Brush(wx.Colour(250, 247, 112)),
            'vectorLegend': wx.Brush(wx.Colour(250, 247, 112)),
            'mapinfo': wx.Brush(wx.Colour(127, 222, 252)),
            'scalebar': wx.Brush(wx.Colour(200, 200, 200)),
            'image': wx.Brush(wx.Colour(255, 200, 50)),
            'northArrow': wx.Brush(wx.Colour(255, 255, 255)),
            'point': wx.Brush(wx.Colour(200, 200, 200)),
            'line': wx.TRANSPARENT_BRUSH,
            'box': wx.TRANSPARENT_BRUSH,
            'select': wx.TRANSPARENT_BRUSH,
            'resize': wx.BLACK_BRUSH
        }

        # list of objects to draw
        self.objectId = []

        # instructions
        self.instruction = Instruction(
            parent=self, objectsToDraw=self.objectId)
        # open dialogs
        self.openDialogs = dict()

        self.pageId = NewId()
        # current page of flatnotebook
        self.currentPage = 0
        # canvas for draft mode
        self.canvas = PsMapBufferedWindow(
            parent=self,
            mouse=self.mouse,
            pen=self.pen,
            brush=self.brush,
            cursors=self.cursors,
            instruction=self.instruction,
            openDialogs=self.openDialogs,
            pageId=self.pageId,
            objectId=self.objectId,
            preview=False)

        self.canvas.SetCursor(self.cursors["default"])
        self.getInitMap()

        # image path
        env = grass.gisenv()
        self.imgName = grass.tempfile()

        # canvas for preview
        self.previewCanvas = PsMapBufferedWindow(
            parent=self,
            mouse=self.mouse,
            cursors=self.cursors,
            pen=self.pen,
            brush=self.brush,
            preview=True)

        # set WIND_OVERRIDE
        grass.use_temp_region()

        self.toolbar.SelectDefault()

        # create queues
        self.requestQ = Queue.Queue()
        self.resultQ = Queue.Queue()
        # thread
        self.cmdThread = CmdThread(self, self.requestQ, self.resultQ)

        self._layout()
        self.SetMinSize(wx.Size(775, 600))
        # workaround for http://trac.wxwidgets.org/ticket/13628
        self.SetSize(self.GetBestSize())

        self.Bind(fnb.EVT_FLATNOTEBOOK_PAGE_CHANGED, self.OnPageChanged)
        self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
        self.Bind(EVT_CMD_DONE, self.OnCmdDone)

        if not havePILImage:
            wx.CallAfter(self._showErrMsg)

    def _showErrMsg(self):
        """Show error message (missing preview)
        """
        GError(parent=self,
               message=_("Python Imaging Library is not available.\n"
                         "'Preview' functionality won't work."),
               showTraceback=False)

    def _layout(self):
        """Do layout
        """
        mainSizer = wx.BoxSizer(wx.VERTICAL)
        if globalvar.hasAgw:
            self.book = fnb.FlatNotebook(parent=self,
                                         id=wx.ID_ANY,
                                         agwStyle=globalvar.FNPageDStyle)
        else:
            self.book = fnb.FlatNotebook(parent=self,
                                         id=wx.ID_ANY,
                                         style=globalvar.FNPageDStyle)

        self.book.AddPage(self.canvas, "Draft mode")
        self.book.AddPage(self.previewCanvas, "Preview")
        self.book.SetSelection(0)

        mainSizer.Add(self.book, 1, wx.EXPAND)

        self.SetSizer(mainSizer)
        mainSizer.Fit(self)

    def _checkMapFrameExists(self, type_id):
        """Check if map frame exists

        :param int type_id: type id (raster, vector,...)

        :return bool: False if map frame doesn't exists
        """
        if self.instruction.FindInstructionByType('map'):
            mapId = self.instruction.FindInstructionByType('map').id
        else:
            mapId = None

        if not type_id:
            if not mapId:
                GMessage(message=_("Please, create map frame first."))
                return False
        return True

    def _switchToPage(self, page_index=0):
        """Switch to page (default to Draft page)

        :param int page_index: page index where you want to switch
        """
        self.book.SetSelection(page_index)
        self.currentPage = page_index

    def InstructionFile(self):
        """Creates mapping instructions"""

        text = str(self.instruction)
        try:
            text = text.encode('Latin_1')
        except UnicodeEncodeError as err:
            try:
                pos = str(err).split('position')[1].split(':')[0].strip()
            except IndexError:
                pos = ''
            if pos:
                message = _("Characters on position %s are not supported "
                            "by ISO-8859-1 (Latin 1) encoding "
                            "which is required by module ps.map.") % pos
            else:
                message = _("Not all characters are supported "
                            "by ISO-8859-1 (Latin 1) encoding "
                            "which is required by module ps.map.")
            GMessage(message=message)
            return ''
        return text

    def OnPSFile(self, event):
        """Generate PostScript"""
        filename = self.getFile(
            wildcard="PostScript (*.ps)|*.ps|Encapsulated PostScript (*.eps)|*.eps")
        if filename:
            self.PSFile(filename)

    def OnPsMapDialog(self, event):
        """Launch ps.map dialog
        """
        GUI(parent=self).ParseCommand(cmd=['ps.map'])

    def OnPDFFile(self, event):
        """Generate PDF from PS with ps2pdf if available"""
        if not sys.platform == 'win32':
            try:
                p = grass.Popen(["ps2pdf"], stderr=grass.PIPE)
                p.stderr.close()

            except OSError:
                GMessage(
                    parent=self,
                    message=_(
                        "Program ps2pdf is not available. Please install it first to create PDF."))
                return

        filename = self.getFile(wildcard="PDF (*.pdf)|*.pdf")
        if filename:
            self.PSFile(filename, pdf=True)

    def OnPreview(self, event):
        """Run ps.map and show result"""
        self.PSFile()

    def PSFile(self, filename=None, pdf=False):
        """Create temporary instructions file and run ps.map with output = filename"""
        instrFile = grass.tempfile()
        instrFileFd = open(instrFile, mode='wb')
        content = self.InstructionFile()
        if not content:
            return
        instrFileFd.write(content)
        instrFileFd.flush()
        instrFileFd.close()

        temp = False
        regOld = grass.region()

        if pdf:
            pdfname = filename
        else:
            pdfname = None
        #preview or pdf
        if not filename or (filename and pdf):
            temp = True
            filename = grass.tempfile()
            if not pdf:  # lower resolution for preview
                if self.instruction.FindInstructionByType('map'):
                    mapId = self.instruction.FindInstructionByType('map').id
                    SetResolution(dpi=100, width=self.instruction[mapId]['rect'][
                                  2], height=self.instruction[mapId]['rect'][3])

        cmd = ['ps.map', '--overwrite']
        if os.path.splitext(filename)[1] == '.eps':
            cmd.append('-e')
        if self.instruction[self.pageId]['Orientation'] == 'Landscape':
            cmd.append('-r')
        cmd.append('input=%s' % instrFile)
        cmd.append('output=%s' % filename)
        if pdf:
            self.SetStatusText(_('Generating PDF...'), 0)
        elif not temp:
            self.SetStatusText(_('Generating PostScript...'), 0)
        else:
            self.SetStatusText(_('Generating preview...'), 0)

        self.cmdThread.RunCmd(
            cmd,
            userData={
                'instrFile': instrFile,
                'filename': filename,
                'pdfname': pdfname,
                'temp': temp,
                'regionOld': regOld})

    def OnCmdDone(self, event):
        """ps.map process finished"""

        if event.returncode != 0:
            GMessage(
                parent=self,
                message=_("Ps.map exited with return code %s") %
                event.returncode)

            grass.try_remove(event.userData['instrFile'])
            if event.userData['temp']:
                grass.try_remove(event.userData['filename'])
            return

        if event.userData['pdfname']:
            if sys.platform == 'win32':
                command = ['gswin32c',
                           '-P-', '-dSAFER',
                           '-dCompatibilityLevel=1.4',
                           '-q', '-P-',
                           '-dNOPAUSE', '-dBATCH',
                           '-sDEVICE=pdfwrite',
                           '-dPDFSETTINGS=/prepress', '-r1200',
                           '-sstdout=%stderr',
                           '-sOutputFile=%s' % event.userData['pdfname'],
                           '-P-', '-dSAFER',
                           '-dCompatibilityLevel=1.4',
                           '-c', '.setpdfwrite', '-f',
                           event.userData['filename']]
            else:
                command = [
                    'ps2pdf',
                    '-dPDFSETTINGS=/prepress',
                    '-r1200',
                    event.userData['filename'],
                    event.userData['pdfname']]
            try:
                proc = grass.Popen(command)
                ret = proc.wait()
                if ret > 0:
                    GMessage(
                        parent=self,
                        message=_("%(prg)s exited with return code %(code)s") % {
                            'prg': command[0],
                            'code': ret})
                else:
                    self.SetStatusText(_('PDF generated'), 0)
            except OSError as e:
                GError(parent=self, message=_(
                    "Program ps2pdf is not available. Please install it to create PDF.\n\n %s") % e)

        elif not event.userData['temp']:
            self.SetStatusText(_('PostScript file generated'), 0)

        # show preview only when user doesn't want to create ps or pdf
        if havePILImage and event.userData[
                'temp'] and not event.userData['pdfname']:
            RunCommand('g.region', cols=event.userData['regionOld'][
                       'cols'], rows=event.userData['regionOld']['rows'])
            # wx.BusyInfo does not display the message
            busy = wx.BusyInfo(
                _("Generating preview, wait please"),
                parent=self)
            wx.GetApp().Yield()
            try:
                im = PILImage.open(event.userData['filename'])
                if self.instruction[self.pageId]['Orientation'] == 'Landscape':
                    import numpy as np
                    im_array = np.array(im)
                    im = PILImage.fromarray(np.rot90(im_array, 3))

                # hack for Windows, change method for loading EPS
                if sys.platform == 'win32':
                    import types
                    im.load = types.MethodType(loadPSForWindows, im)
                im.save(self.imgName, format='PNG')
            except (IOError, OSError) as e:
                del busy
                dlg = HyperlinkDialog(
                    self, title=_("Preview not available"),
                    message=_(
                        "Preview is not available probably because Ghostscript is not installed or not on PATH."),
                    hyperlink='http://trac.osgeo.org/grass/wiki/CompileOnWindows#Ghostscript',
                    hyperlinkLabel=_(
                        "Please follow instructions on GRASS Trac Wiki."))
                dlg.ShowModal()
                dlg.Destroy()
                return

            rect = self.previewCanvas.ImageRect()
            self.previewCanvas.image = wx.Image(
                self.imgName, wx.BITMAP_TYPE_PNG)
            self.previewCanvas.DrawImage(rect=rect)

            del busy
            self.SetStatusText(_('Preview generated'), 0)
            self.book.SetSelection(1)
            self.currentPage = 1

        grass.try_remove(event.userData['instrFile'])
        if event.userData['temp']:
            grass.try_remove(event.userData['filename'])

        self.delayedCall = wx.CallLater(
            4000, lambda: self.SetStatusText("", 0))

    def getFile(self, wildcard):
        suffix = []
        for filter in wildcard.split('|')[1::2]:
            s = filter.strip('*').split('.')[1]
            if s:
                s = '.' + s
            suffix.append(s)
        raster = self.instruction.FindInstructionByType('raster')
        if raster:
            rasterId = raster.id
        else:
            rasterId = None

        if rasterId and self.instruction[rasterId]['raster']:
            mapName = self.instruction[rasterId][
                'raster'].split('@')[0] + suffix[0]
        else:
            mapName = ''

        filename = ''
        dlg = wx.FileDialog(
            self, message=_("Save file as"),
            defaultDir="", defaultFile=mapName, wildcard=wildcard,
            style=wx.FD_CHANGE_DIR | wx.FD_SAVE | wx.FD_OVERWRITE_PROMPT)
        if dlg.ShowModal() == wx.ID_OK:
            filename = dlg.GetPath()
            suffix = suffix[dlg.GetFilterIndex()]
            if not os.path.splitext(filename)[1]:
                filename = filename + suffix
            elif os.path.splitext(filename)[1] != suffix and suffix != '':
                filename = os.path.splitext(filename)[0] + suffix

        dlg.Destroy()
        return filename

    def OnInstructionFile(self, event):
        filename = self.getFile(
            wildcard="*.psmap|*.psmap|Text file(*.txt)|*.txt|All files(*.*)|*.*")
        if filename:
            instrFile = open(filename, "wb")
            content = self.InstructionFile()
            if not content:
                return
            instrFile.write(content)
            instrFile.close()

    def OnLoadFile(self, event):
        """Launch file dialog and load selected file"""
        # find file
        filename = ''
        dlg = wx.FileDialog(
            self,
            message="Find instructions file",
            defaultDir="",
            defaultFile='',
            wildcard="All files (*.*)|*.*",
            style=wx.FD_CHANGE_DIR | wx.FD_OPEN)
        if dlg.ShowModal() == wx.ID_OK:
            filename = dlg.GetPath()
        dlg.Destroy()
        if not filename:
            return
        # load instructions
        self.LoadFile(filename)

    def LoadFile(self, filename):
        """Load file and read instructions"""
        readObjectId = []
        readInstruction = Instruction(parent=self, objectsToDraw=readObjectId)
        ok = readInstruction.Read(filename)
        if not ok:
            GMessage(_("Failed to read file %s.") % filename)
        else:
            self.instruction = self.canvas.instruction = readInstruction
            self.objectId = self.canvas.objectId = readObjectId
            self.pageId = self.canvas.pageId = self.instruction.FindInstructionByType(
                'page').id
            self.canvas.UpdateMapLabel()
            self.canvas.dragId = -1
            self.canvas.Clear()
            self.canvas.SetPage()
            # self.canvas.ZoomAll()

            self.DialogDataChanged(self.objectId)

    def OnPageSetup(self, event=None):
        """Specify paper size, margins and orientation"""
        id = self.instruction.FindInstructionByType('page').id
        dlg = PageSetupDialog(self, id=id, settings=self.instruction)
        dlg.CenterOnParent()
        val = dlg.ShowModal()
        if val == wx.ID_OK:
            self.canvas.SetPage()
            self.getInitMap()
            self.canvas.RecalculatePosition(ids=self.objectId)
        dlg.Destroy()

    def OnPointer(self, event):
        self.mouse["use"] = "pointer"
        self.canvas.SetCursor(self.cursors["default"])
        self.previewCanvas.SetCursor(self.cursors["default"])

    def OnPan(self, event):
        self.mouse["use"] = "pan"
        self.canvas.SetCursor(self.cursors["hand"])
        self.previewCanvas.SetCursor(self.cursors["hand"])

    def OnZoomIn(self, event):
        self.mouse["use"] = "zoomin"
        self.canvas.SetCursor(self.cursors["cross"])
        self.previewCanvas.SetCursor(self.cursors["cross"])

    def OnZoomOut(self, event):
        self.mouse["use"] = "zoomout"
        self.canvas.SetCursor(self.cursors["cross"])
        self.previewCanvas.SetCursor(self.cursors["cross"])

    def OnZoomAll(self, event):
        self.mouseOld = self.mouse['use']
        if self.currentPage == 0:
            self.cursorOld = self.canvas.GetCursor()
        else:
            self.cursorOld = self.previewCanvas.GetCursor()
            self.previewCanvas.GetCursor()
        self.mouse["use"] = "zoomin"
        if self.currentPage == 0:
            self.canvas.ZoomAll()
        else:
            self.previewCanvas.ZoomAll()
        self.mouse["use"] = self.mouseOld
        if self.currentPage == 0:
            self.canvas.SetCursor(self.cursorOld)
        else:
            self.previewCanvas.SetCursor(self.cursorOld)

    def OnAddMap(self, event, notebook=False):
        """Add or edit map frame"""
        if self.instruction.FindInstructionByType('map'):
            mapId = self.instruction.FindInstructionByType('map').id
        else:
            mapId = None
        id = [mapId, None, None]

        if notebook:
            if self.instruction.FindInstructionByType('vector'):
                vectorId = self.instruction.FindInstructionByType('vector').id
            else:
                vectorId = None
            if self.instruction.FindInstructionByType('raster'):
                rasterId = self.instruction.FindInstructionByType('raster').id
            else:
                rasterId = None
            id[1] = rasterId
            id[2] = vectorId

        if mapId:  # map exists
            self.toolbar.SelectDefault()

            if notebook:
                # check map, raster, vector and save, destroy them
                if 'map' in self.openDialogs:
                    self.openDialogs['map'].OnOK(event=None)
                if 'raster' in self.openDialogs:
                    self.openDialogs['raster'].OnOK(event=None)
                if 'vector' in self.openDialogs:
                    self.openDialogs['vector'].OnOK(event=None)

                if 'mapNotebook' not in self.openDialogs:
                    dlg = MapDialog(
                        parent=self,
                        id=id,
                        settings=self.instruction,
                        notebook=notebook)
                    self.openDialogs['mapNotebook'] = dlg
                self.openDialogs['mapNotebook'].Show()
            else:
                if 'mapNotebook' in self.openDialogs:
                    self.openDialogs['mapNotebook'].notebook.ChangeSelection(0)
                else:
                    if 'map' not in self.openDialogs:
                        dlg = MapDialog(
                            parent=self,
                            id=id,
                            settings=self.instruction,
                            notebook=notebook)
                        self.openDialogs['map'] = dlg
                    self.openDialogs['map'].Show()

        else:    # sofar no map
            self.mouse["use"] = "addMap"
            self.canvas.SetCursor(self.cursors["cross"])
            if self.currentPage == 1:
                self.book.SetSelection(0)
                self.currentPage = 0

    def OnAddRaster(self, event):
        """Add raster map"""
        if self.instruction.FindInstructionByType('raster'):
            id = self.instruction.FindInstructionByType('raster').id
        else:
            id = None

        if not self._checkMapFrameExists(type_id=id):
            return

##        dlg = RasterDialog(self, id = id, settings = self.instruction)
# dlg.ShowModal()
        if 'mapNotebook' in self.openDialogs:
            self.openDialogs['mapNotebook'].notebook.ChangeSelection(1)
        else:
            if 'raster' not in self.openDialogs:
                dlg = RasterDialog(self, id=id, settings=self.instruction)
                self.openDialogs['raster'] = dlg
            self.openDialogs['raster'].Show()

    def OnAddVect(self, event):
        """Add vector map"""
        if self.instruction.FindInstructionByType('vector'):
            id = self.instruction.FindInstructionByType('vector').id
        else:
            id = None

        if not self._checkMapFrameExists(type_id=id):
            return

##        dlg = MainVectorDialog(self, id = id, settings = self.instruction)
# dlg.ShowModal()
        if 'mapNotebook' in self.openDialogs:
            self.openDialogs['mapNotebook'].notebook.ChangeSelection(2)
        else:
            if 'vector' not in self.openDialogs:
                dlg = MainVectorDialog(self, id=id, settings=self.instruction)
                self.openDialogs['vector'] = dlg
            self.openDialogs['vector'].Show()

    def OnAddScalebar(self, event):
        """Add scalebar"""
        if projInfo()['proj'] == 'll':
            GMessage(
                message=_("Scalebar is not appropriate for this projection"))
            return
        if self.instruction.FindInstructionByType('scalebar'):
            id = self.instruction.FindInstructionByType('scalebar').id
        else:
            id = None

        if 'scalebar' not in self.openDialogs:
            dlg = ScalebarDialog(self, id=id, settings=self.instruction)
            self.openDialogs['scalebar'] = dlg
        self.openDialogs['scalebar'].Show()

    def OnAddLegend(self, event, page=0):
        """Add raster or vector legend"""
        if self.instruction.FindInstructionByType('rasterLegend'):
            idR = self.instruction.FindInstructionByType('rasterLegend').id
        else:
            idR = None
        if self.instruction.FindInstructionByType('vectorLegend'):
            idV = self.instruction.FindInstructionByType('vectorLegend').id
        else:
            idV = None

        if 'rasterLegend' not in self.openDialogs:
            dlg = LegendDialog(
                self, id=[idR, idV],
                settings=self.instruction, page=page)
            self.openDialogs['rasterLegend'] = dlg
            self.openDialogs['vectorLegend'] = dlg
        self.openDialogs['rasterLegend'].notebook.ChangeSelection(page)
        self.openDialogs['rasterLegend'].Show()

    def OnAddMapinfo(self, event):
        if self.instruction.FindInstructionByType('mapinfo'):
            id = self.instruction.FindInstructionByType('mapinfo').id
        else:
            id = None

        if 'mapinfo' not in self.openDialogs:
            dlg = MapinfoDialog(self, id=id, settings=self.instruction)
            self.openDialogs['mapinfo'] = dlg
        self.openDialogs['mapinfo'].Show()

    def OnAddImage(self, event, id=None):
        """Show dialog for image adding and editing"""
        position = None
        if 'image' in self.openDialogs:
            position = self.openDialogs['image'].GetPosition()
            self.openDialogs['image'].OnApply(event=None)
            self.openDialogs['image'].Destroy()
        dlg = ImageDialog(self, id=id, settings=self.instruction)
        self.openDialogs['image'] = dlg
        if position:
            dlg.SetPosition(position)
        dlg.Show()

    def OnAddNorthArrow(self, event, id=None):
        """Show dialog for north arrow adding and editing"""
        if self.instruction.FindInstructionByType('northArrow'):
            id = self.instruction.FindInstructionByType('northArrow').id
        else:
            id = None

        if 'northArrow' not in self.openDialogs:
            dlg = NorthArrowDialog(self, id=id, settings=self.instruction)
            self.openDialogs['northArrow'] = dlg
        self.openDialogs['northArrow'].Show()

    def OnAddText(self, event, id=None):
        """Show dialog for text adding and editing"""
        position = None
        if 'text' in self.openDialogs:
            position = self.openDialogs['text'].GetPosition()
            self.openDialogs['text'].OnApply(event=None)
            self.openDialogs['text'].Destroy()
        dlg = TextDialog(self, id=id, settings=self.instruction)
        self.openDialogs['text'] = dlg
        if position:
            dlg.SetPosition(position)
        dlg.Show()

    def OnAddPoint(self, event):
        """Add point action selected"""
        self.mouse["use"] = "addPoint"
        self.canvas.SetCursor(self.cursors["cross"])
        self._switchToPage()

    def AddPoint(self, id=None, coordinates=None):
        """Add point and open property dialog.

        :param id: id point id (None if creating new point)
        :param coordinates: coordinates of new point
        """
        position = None
        if 'point' in self.openDialogs:
            position = self.openDialogs['point'].GetPosition()
            self.openDialogs['point'].OnApply(event=None)
            self.openDialogs['point'].Destroy()
        dlg = PointDialog(self, id=id, settings=self.instruction,
                          coordinates=coordinates)
        self.openDialogs['point'] = dlg
        if position:
            dlg.SetPosition(position)
        if coordinates:
            dlg.OnApply(event=None)
        dlg.Show()

    def OnAddLine(self, event):
        """Add line action selected"""
        self.mouse["use"] = "addLine"
        self.canvas.SetCursor(self.cursors["cross"])
        self._switchToPage()

    def AddLine(self, id=None, coordinates=None):
        """Add line and open property dialog.

        :param id: id line id (None if creating new line)
        :param coordinates: coordinates of new line
        """
        position = None
        if 'line' in self.openDialogs:
            position = self.openDialogs['line'].GetPosition()
            self.openDialogs['line'].OnApply(event=None)
            self.openDialogs['line'].Destroy()
        dlg = RectangleDialog(self, id=id, settings=self.instruction,
                              type='line', coordinates=coordinates)
        self.openDialogs['line'] = dlg
        if position:
            dlg.SetPosition(position)
        if coordinates:
            dlg.OnApply(event=None)
        dlg.Show()

    def OnAddRectangle(self, event):
        """Add rectangle action selected"""
        self.mouse["use"] = "addRectangle"
        self.canvas.SetCursor(self.cursors["cross"])
        self._switchToPage()

    def AddRectangle(self, id=None, coordinates=None):
        """Add rectangle and open property dialog.

        :param id: id rectangle id (None if creating new rectangle)
        :param coordinates: coordinates of new rectangle
        """
        position = None
        if 'rectangle' in self.openDialogs:
            position = self.openDialogs['rectangle'].GetPosition()
            self.openDialogs['rectangle'].OnApply(event=None)
            self.openDialogs['rectangle'].Destroy()
        dlg = RectangleDialog(self, id=id, settings=self.instruction,
                              type='rectangle', coordinates=coordinates)
        self.openDialogs['rectangle'] = dlg
        if position:
            dlg.SetPosition(position)
        if coordinates:
            dlg.OnApply(event=None)
        dlg.Show()

    def OnAddLabels(self, event, id=None):
        """Show dialog for labels"""
        if self.instruction.FindInstructionByType('labels'):
            id = self.instruction.FindInstructionByType('labels').id
        else:
            id = None

        if not self._checkMapFrameExists(type_id=id):
            return

        if 'labels' not in self.openDialogs:
            dlg = LabelsDialog(self, id=id, settings=self.instruction)
            self.openDialogs['labels'] = dlg
        self.openDialogs['labels'].Show()

    def getModifiedTextBounds(self, x, y, textExtent, rotation):
        """computes bounding box of rotated text, not very precisely"""
        w, h = textExtent
        rotation = float(rotation) / 180 * pi
        H = float(w) * sin(rotation)
        W = float(w) * cos(rotation)
        X, Y = x, y
        if pi / 2 < rotation <= 3 * pi / 2:
            X = x + W
        if 0 < rotation < pi:
            Y = y - H
        if rotation == 0:
            return Rect(x, y, *textExtent)
        else:
            return Rect(X, Y, abs(W), abs(H)).Inflate(h, h)

    def makePSFont(self, textDict):
        """creates a wx.Font object from selected postscript font. To be
        used for estimating bounding rectangle of text"""

        fontsize = textDict['fontsize'] * self.canvas.currScale
        fontface = textDict['font'].split('-')[0]
        try:
            fontstyle = textDict['font'].split('-')[1]
        except IndexError:
            fontstyle = ''

        if fontface == "Times":
            family = wx.FONTFAMILY_ROMAN
            face = "times"
        elif fontface == "Helvetica":
            family = wx.FONTFAMILY_SWISS
            face = 'helvetica'
        elif fontface == "Courier":
            family = wx.FONTFAMILY_TELETYPE
            face = 'courier'
        else:
            family = wx.FONTFAMILY_DEFAULT
            face = ''

        style = wx.FONTSTYLE_NORMAL
        weight = wx.FONTWEIGHT_NORMAL

        if 'Oblique' in fontstyle:
            style = wx.FONTSTYLE_SLANT

        if 'Italic' in fontstyle:
            style = wx.FONTSTYLE_ITALIC

        if 'Bold' in fontstyle:
            weight = wx.FONTWEIGHT_BOLD

        try:
            fn = wx.Font(pointSize=fontsize, family=family, style=style,
                         weight=weight, face=face)
        except:
            fn = wx.Font(
                pointSize=fontsize,
                family=wx.FONTFAMILY_DEFAULT,
                style=wx.FONTSTYLE_NORMAL,
                weight=wx.FONTWEIGHT_NORMAL)

        return fn

    def getTextExtent(self, textDict):
        """Estimates bounding rectangle of text"""
        #fontsize = str(fontsize if fontsize >= 4 else 4)
        # dc created because of method GetTextExtent, which pseudoDC lacks
        dc = ClientDC(self)

        fn = self.makePSFont(textDict)

        try:
            dc.SetFont(fn)
            w, h, lh = dc.GetFullMultiLineTextExtent(textDict['text'])
            return (w, h)
        except:
            return (0, 0)

    def getInitMap(self):
        """Create default map frame when no map is selected, needed for coordinates in map units"""
        instrFile = grass.tempfile()
        instrFileFd = open(instrFile, mode='wb')
        content = self.InstructionFile()
        if not content:
            return
        instrFileFd.write(content)
        instrFileFd.flush()
        instrFileFd.close()

        page = self.instruction.FindInstructionByType('page')
        mapInitRect = GetMapBounds(
            instrFile, portrait=(
                page['Orientation'] == 'Portrait'))
        grass.try_remove(instrFile)

        region = grass.region()
        units = UnitConversion(self)
        realWidth = units.convert(
            value=abs(region['w'] - region['e']),
            fromUnit='meter', toUnit='inch')
        scale = mapInitRect.Get()[2] / realWidth

        initMap = self.instruction.FindInstructionByType('initMap')
        if initMap:
            id = initMap.id
        else:
            id = None

        if not id:
            id = NewId()
            initMap = InitMap(id)
            self.instruction.AddInstruction(initMap)
        self.instruction[id].SetInstruction(
            dict(rect=mapInitRect, scale=scale))

    def OnDelete(self, event):
        if self.canvas.dragId != -1 and self.currentPage == 0:
            if self.instruction[self.canvas.dragId].type == 'map':
                self.deleteObject(self.canvas.dragId)
                self.getInitMap()
                self.canvas.RecalculateEN()
            else:
                self.deleteObject(self.canvas.dragId)

    def deleteObject(self, id):
        """Deletes object, his id and redraws"""
        # delete from canvas
        self.canvas.pdcObj.RemoveId(id)
        if id == self.canvas.dragId:
            self.canvas.pdcTmp.RemoveAll()
            self.canvas.dragId = -1
        self.canvas.Refresh()

        # delete from instructions
        del self.instruction[id]

    def DialogDataChanged(self, id):
        ids = id
        if isinstance(id, int):
            ids = [id]
        for id in ids:
            itype = self.instruction[id].type

            if itype in ('scalebar', 'mapinfo', 'image'):
                drawRectangle = self.canvas.CanvasPaperCoordinates(
                    rect=self.instruction[id]['rect'], canvasToPaper=False)
                self.canvas.UpdateLabel(itype=itype, id=id)
                self.canvas.Draw(
                    pen=self.pen[itype],
                    brush=self.brush[itype],
                    pdc=self.canvas.pdcObj,
                    drawid=id,
                    pdctype='rectText',
                    bb=drawRectangle)
                self.canvas.RedrawSelectBox(id)
            if itype == 'northArrow':
                self.canvas.UpdateLabel(itype=itype, id=id)
                drawRectangle = self.canvas.CanvasPaperCoordinates(
                    rect=self.instruction[id]['rect'], canvasToPaper=False)
                self.canvas.Draw(
                    pen=self.pen[itype],
                    brush=self.brush[itype],
                    pdc=self.canvas.pdcObj,
                    drawid=id,
                    pdctype='bitmap',
                    bb=drawRectangle)
                self.canvas.RedrawSelectBox(id)

            if itype in ('point', 'line', 'rectangle'):
                drawRectangle = self.canvas.CanvasPaperCoordinates(
                    rect=self.instruction[id]['rect'], canvasToPaper=False)
                # coords only for line
                coords = None
                if itype == 'line':
                    point1 = self.instruction[id]['where'][0]
                    point2 = self.instruction[id]['where'][1]
                    point1Coords = self.canvas.CanvasPaperCoordinates(
                        rect=Rect2DPS(point1, (0, 0)), canvasToPaper=False)[:2]
                    point2Coords = self.canvas.CanvasPaperCoordinates(
                        rect=Rect2DPS(point2, (0, 0)), canvasToPaper=False)[:2]
                    coords = (point1Coords, point2Coords)

                # fill color is not in line
                fcolor = None
                if 'fcolor' in self.instruction[id].GetInstruction():
                    fcolor = self.instruction[id]['fcolor']
                # width is not in point
                width = None
                if 'width' in self.instruction[id].GetInstruction():
                    width = self.instruction[id]['width']

                self.canvas.DrawGraphics(
                    drawid=id,
                    color=self.instruction[id]['color'],
                    shape=itype,
                    fcolor=fcolor,
                    width=width,
                    bb=drawRectangle,
                    lineCoords=coords)

                self.canvas.RedrawSelectBox(id)

            if itype == 'text':

                if self.instruction[id]['rotate']:
                    rot = float(self.instruction[id]['rotate'])
                else:
                    rot = 0

                extent = self.getTextExtent(
                    textDict=self.instruction[id].GetInstruction())
                rect = Rect2DPS(self.instruction[id]['where'], (0, 0))
                self.instruction[id]['coords'] = list(
                    self.canvas.CanvasPaperCoordinates(
                        rect=rect, canvasToPaper=False)[: 2])

                # computes text coordinates according to reference point, not
                # precisely
                if self.instruction[id]['ref'].split()[0] == 'lower':
                    self.instruction[id]['coords'][1] -= extent[1]
                elif self.instruction[id]['ref'].split()[0] == 'center':
                    self.instruction[id]['coords'][1] -= extent[1] / 2
                if self.instruction[id]['ref'].split()[1] == 'right':
                    self.instruction[id]['coords'][
                        0] -= extent[0] * cos(rot / 180 * pi)
                    self.instruction[id]['coords'][
                        1] += extent[0] * sin(rot / 180 * pi)
                elif self.instruction[id]['ref'].split()[1] == 'center':
                    self.instruction[id]['coords'][
                        0] -= extent[0] / 2 * cos(rot / 180 * pi)
                    self.instruction[id]['coords'][
                        1] += extent[0] / 2 * sin(rot / 180 * pi)

                self.instruction[id]['coords'][
                    0] += self.instruction[id]['xoffset']
                self.instruction[id]['coords'][
                    1] -= self.instruction[id]['yoffset']
                coords = self.instruction[id]['coords']
                self.instruction[id]['rect'] = bounds = self.getModifiedTextBounds(
                    coords[0], coords[1], extent, rot)
                self.canvas.DrawRotText(
                    pdc=self.canvas.pdcObj, drawId=id,
                    textDict=self.instruction[id].GetInstruction(),
                    coords=coords, bounds=bounds)
                self.canvas.RedrawSelectBox(id)

            if itype in ('map', 'vector', 'raster', 'labels'):

                if itype == 'raster':  # set resolution
                    info = grass.raster_info(self.instruction[id]['raster'])
                    RunCommand(
                        'g.region',
                        nsres=info['nsres'],
                        ewres=info['ewres'])
                    # change current raster in raster legend

                if 'rasterLegend' in self.openDialogs:
                    self.openDialogs['rasterLegend'].updateDialog()
                id = self.instruction.FindInstructionByType('map').id

                # check resolution
                if itype == 'raster':
                    SetResolution(dpi=self.instruction[id]['resolution'],
                                  width=self.instruction[id]['rect'].width,
                                  height=self.instruction[id]['rect'].height)
                rectCanvas = self.canvas.CanvasPaperCoordinates(
                    rect=self.instruction[id]['rect'], canvasToPaper=False)
                self.canvas.RecalculateEN()
                self.canvas.UpdateMapLabel()

                self.canvas.Draw(
                    pen=self.pen['map'],
                    brush=self.brush['map'],
                    pdc=self.canvas.pdcObj,
                    drawid=id,
                    pdctype='rectText',
                    bb=rectCanvas)
                # redraw select box
                self.canvas.RedrawSelectBox(id)
                self.canvas.pdcTmp.RemoveId(self.canvas.idZoomBoxTmp)
                # redraw to get map to the bottom layer
                #self.canvas.Zoom(zoomFactor = 1, view = (0, 0))

            if itype == 'rasterLegend':
                if self.instruction[id]['rLegend']:
                    self.canvas.UpdateLabel(itype=itype, id=id)
                    drawRectangle = self.canvas.CanvasPaperCoordinates(
                        rect=self.instruction[id]['rect'], canvasToPaper=False)
                    self.canvas.Draw(
                        pen=self.pen[itype],
                        brush=self.brush[itype],
                        pdc=self.canvas.pdcObj,
                        drawid=id,
                        pdctype='rectText',
                        bb=drawRectangle)
                    self.canvas.RedrawSelectBox(id)
                else:
                    self.deleteObject(id)

            if itype == 'vectorLegend':
                if not self.instruction.FindInstructionByType('vector'):
                    self.deleteObject(id)
                elif self.instruction[id]['vLegend']:
                    self.canvas.UpdateLabel(itype=itype, id=id)
                    drawRectangle = self.canvas.CanvasPaperCoordinates(
                        rect=self.instruction[id]['rect'], canvasToPaper=False)
                    self.canvas.Draw(
                        pen=self.pen[itype],
                        brush=self.brush[itype],
                        pdc=self.canvas.pdcObj,
                        drawid=id,
                        pdctype='rectText',
                        bb=drawRectangle)
                    self.canvas.RedrawSelectBox(id)

                else:
                    self.deleteObject(id)

    def OnPageChanged(self, event):
        """Flatnotebook page has changed"""
        self.currentPage = self.book.GetPageIndex(self.book.GetCurrentPage())
        if self.currentPage == 1:
            self.SetStatusText(
                _("Press button with green triangle icon to generate preview."))
        else:
            self.SetStatusText('')

    def OnHelp(self, event):
        """Show help"""
        if self.parent and self.parent.GetName() == 'LayerManager':
            log = self.parent.GetLogWindow()
            log.RunCmd(['g.manual',
                        'entry=wxGUI.psmap'])
        else:
            RunCommand('g.manual',
                       quiet=True,
                       entry='wxGUI.psmap')

    def OnAbout(self, event):
        """Display About window"""
        ShowAboutDialog(
            prgName=_('wxGUI Cartographic Composer'),
            startYear='2011')

    def OnCloseWindow(self, event):
        """Close window"""
        try:
            os.remove(self.imgName)
        except OSError:
            pass
        grass.set_raise_on_error(False)
        if hasattr(self, 'delayedCall') and self.delayedCall.IsRunning():
            self.delayedCall.Stop()
        self.Destroy()


class PsMapBufferedWindow(wx.Window):
    """A buffered window class."""

    def __init__(self, parent, id=wx.ID_ANY,
                 style=wx.NO_FULL_REPAINT_ON_RESIZE,
                 **kwargs):
        """
        :param parent: parent window
        :param kwargs: other wx.Window parameters
        """
        wx.Window.__init__(self, parent, id=id, style=style)
        self.parent = parent

        self.FitInside()

        # store an off screen empty bitmap for saving to file
        self._buffer = None
        # indicates whether or not a resize event has taken place
        self.resize = False

        self.mouse = kwargs['mouse']
        self.cursors = kwargs['cursors']
        self.preview = kwargs['preview']
        self.pen = kwargs['pen']
        self.brush = kwargs['brush']

        if 'instruction' in kwargs:
            self.instruction = kwargs['instruction']
        if 'openDialogs' in kwargs:
            self.openDialogs = kwargs['openDialogs']
        if 'pageId' in kwargs:
            self.pageId = kwargs['pageId']
        if 'objectId' in kwargs:
            self.objectId = kwargs['objectId']

        # labels
        self.itemLabelsDict = {'map': _("MAP FRAME"),
                               'rasterLegend': _("RASTER LEGEND"),
                               'vectorLegend': _("VECTOR LEGEND"),
                               'mapinfo': _("MAP INFO"),
                               'scalebar': _("SCALE BAR"),
                               'image': _("IMAGE"),
                               'northArrow': _("NORTH ARROW")}
        self.itemLabels = {}

        # define PseudoDC
        self.pdc = PseudoDC()
        self.pdcObj = PseudoDC()
        self.pdcPaper = PseudoDC()
        self.pdcTmp = PseudoDC()
        self.pdcImage = PseudoDC()

        self.SetClientSize((700, 510))  # ?
        self._buffer = EmptyBitmap(*self.GetClientSize())

        self.idBoxTmp = NewId()
        self.idZoomBoxTmp = NewId()
        self.idResizeBoxTmp = NewId()
        # ids of marks for moving line vertices
        self.idLinePointsTmp = (NewId(), NewId())

        self.resizeBoxSize = wx.Size(8, 8)
        self.showResizeHelp = False  # helper for correctly working statusbar

        self.dragId = -1

        if self.preview:
            self.image = None
            self.imageId = 2000
            self.imgName = self.parent.imgName

        self.currScale = None

        self.Clear()

        self.Bind(wx.EVT_ERASE_BACKGROUND, lambda x: None)

        self.Bind(wx.EVT_PAINT, self.OnPaint)
        self.Bind(wx.EVT_SIZE, self.OnSize)
        self.Bind(wx.EVT_IDLE, self.OnIdle)
        # self.Bind(wx.EVT_MOUSE_EVENTS, self.OnMouse)
        self.Bind(wx.EVT_MOUSE_EVENTS, self.MouseActions)

    def Clear(self):
        """Clear canvas and set paper
        """
        bg = wx.LIGHT_GREY_BRUSH
        self.pdcPaper.BeginDrawing()
        self.pdcPaper.SetBackground(bg)
        self.pdcPaper.Clear()
        self.pdcPaper.EndDrawing()

        self.pdcObj.RemoveAll()
        self.pdcTmp.RemoveAll()

        if not self.preview:
            self.SetPage()

    def CanvasPaperCoordinates(self, rect, canvasToPaper=True):
        """Converts canvas (pixel) -> paper (inch) coordinates and size and vice versa"""

        units = UnitConversion(self)

        fromU = 'pixel'
        toU = 'inch'
        pRect = self.pdcPaper.GetIdBounds(self.pageId)
        pRectx, pRecty = pRect.x, pRect.y
        scale = 1 / self.currScale
        if not canvasToPaper:  # paper -> canvas
            fromU = 'inch'
            toU = 'pixel'
            scale = self.currScale
            pRectx = units.convert(
                value=- pRect.x,
                fromUnit='pixel',
                toUnit='inch') / scale  # inch, real, negative
            pRecty = units.convert(
                value=- pRect.y,
                fromUnit='pixel',
                toUnit='inch') / scale
        Width = units.convert(
            value=rect.GetWidth(),
            fromUnit=fromU,
            toUnit=toU) * scale
        Height = units.convert(
            value=rect.GetHeight(),
            fromUnit=fromU,
            toUnit=toU) * scale
        X = units.convert(
            value=(
                rect.GetX() - pRectx),
            fromUnit=fromU,
            toUnit=toU) * scale
        Y = units.convert(
            value=(
                rect.GetY() - pRecty),
            fromUnit=fromU,
            toUnit=toU) * scale

        return Rect2D(X, Y, Width, Height)

    def SetPage(self):
        """Sets and changes page, redraws paper"""

        page = self.instruction[self.pageId]
        if not page:
            page = PageSetup(id=self.pageId)
            self.instruction.AddInstruction(page)

        ppi = wx.ClientDC(self).GetPPI()
        cW, cH = self.GetClientSize()
        pW, pH = page['Width'] * ppi[0], page['Height'] * ppi[1]

        if self.currScale is None:
            self.currScale = min(cW / pW, cH / pH)
        pW = pW * self.currScale
        pH = pH * self.currScale

        x = cW / 2 - pW / 2
        y = cH / 2 - pH / 2
        self.DrawPaper(Rect(x, y, pW, pH))

    def modifyRectangle(self, r):
        """Recalculates rectangle not to have negative size"""
        if r.GetWidth() < 0:
            r.SetX(r.GetX() + r.GetWidth())
        if r.GetHeight() < 0:
            r.SetY(r.GetY() + r.GetHeight())
        r.SetWidth(abs(r.GetWidth()))
        r.SetHeight(abs(r.GetHeight()))
        return r

    def RecalculateEN(self):
        """Recalculate east and north for texts (eps, points) after their or map's movement"""
        try:
            mapId = self.instruction.FindInstructionByType('map').id
        except AttributeError:
            mapId = self.instruction.FindInstructionByType('initMap').id

        for itemType in ('text', 'image', 'northArrow',
                         'point', 'line', 'rectangle'):
            items = self.instruction.FindInstructionByType(itemType, list=True)
            for item in items:
                instr = self.instruction[item.id]
                if itemType in ('line', 'rectangle'):
                    if itemType == 'line':
                        e1, n1 = PaperMapCoordinates(
                            mapInstr=self.instruction[mapId],
                            x=instr['where'][0][0],
                            y=instr['where'][0][1],
                            paperToMap=True)
                        e2, n2 = PaperMapCoordinates(
                            mapInstr=self.instruction[mapId],
                            x=instr['where'][1][0],
                            y=instr['where'][1][1],
                            paperToMap=True)
                    else:
                        e1, n1 = PaperMapCoordinates(
                            mapInstr=self.instruction[mapId],
                            x=instr['rect'].GetLeft(),
                            y=instr['rect'].GetTop(),
                            paperToMap=True)
                        e2, n2 = PaperMapCoordinates(
                            mapInstr=self.instruction[mapId],
                            x=instr['rect'].GetRight(),
                            y=instr['rect'].GetBottom(),
                            paperToMap=True)
                    instr['east1'] = e1
                    instr['north1'] = n1
                    instr['east2'] = e2
                    instr['north2'] = n2
                else:
                    e, n = PaperMapCoordinates(
                        mapInstr=self.instruction[mapId],
                        x=instr['where'][0],
                        y=instr['where'][1],
                        paperToMap=True)
                    instr['east'], instr['north'] = e, n

    def OnPaint(self, event):
        """Draw pseudo DC to buffer
        """
        if not self._buffer:
            return
        dc = wx.BufferedPaintDC(self, self._buffer)
        # use PrepareDC to set position correctly
        # probably does nothing, removed from wxPython 2.9
        # self.PrepareDC(dc)

        dc.SetBackground(wx.LIGHT_GREY_BRUSH)
        dc.Clear()

        # draw paper
        if not self.preview:
            self.pdcPaper.DrawToDC(dc)
        # draw to the DC using the calculated clipping rect

        rgn = self.GetUpdateRegion()

        if not self.preview:
            self.pdcObj.DrawToDCClipped(dc, rgn.GetBox())
        else:
            self.pdcImage.DrawToDCClipped(dc, rgn.GetBox())
        self.pdcTmp.DrawToDCClipped(dc, rgn.GetBox())

    def MouseActions(self, event):
        """Mouse motion and button click notifier
        """
        disable = self.preview and self.mouse['use'] in ('pointer', 'resize',
                                                         'addMap', 'addPoint',
                                                         'addLine', 'addRectangle')
        # zoom with mouse wheel
        if event.GetWheelRotation() != 0:
            self.OnMouseWheel(event)

        # left mouse button pressed
        elif event.LeftDown() and not disable:
            self.OnLeftDown(event)

        # left mouse button released
        elif event.LeftUp() and not disable:
            self.OnLeftUp(event)

        # dragging
        elif event.Dragging() and not disable:
            self.OnDragging(event)

        # double click
        elif event.ButtonDClick() and not disable:
            self.OnButtonDClick(event)

        # middle mouse button pressed
        elif event.MiddleDown():
            self.OnMiddleDown(event)

        elif event.Moving():
            self.OnMouseMoving(event)

    def OnMouseWheel(self, event):
        """Mouse wheel scrolled.

        Changes zoom."""
        if UserSettings.Get(group='display',
                            key='mouseWheelZoom',
                            subkey='selection') == 2:
            event.Skip()
            return

        zoom = event.GetWheelRotation()
        oldUse = self.mouse['use']
        self.mouse['begin'] = event.GetPosition()

        if UserSettings.Get(group='display',
                            key='scrollDirection',
                            subkey='selection'):
            zoom *= -1

        if zoom > 0:
            self.mouse['use'] = 'zoomin'
        else:
            self.mouse['use'] = 'zoomout'

        zoomFactor, view = self.ComputeZoom(Rect(0, 0, 0, 0))
        self.Zoom(zoomFactor, view)
        self.mouse['use'] = oldUse

    def OnMouseMoving(self, event):
        """Mouse cursor moving.

        Change cursor when moving over resize marker.
        """
        if self.preview:
            return

        if self.mouse['use'] in ('pointer', 'resize'):
            pos = event.GetPosition()
            foundResize = self.pdcTmp.FindObjects(pos[0], pos[1])
            if foundResize and foundResize[0] in (
                    self.idResizeBoxTmp,) + self.idLinePointsTmp:
                self.SetCursor(self.cursors["sizenwse"])
                self.parent.SetStatusText(
                    _('Click and drag to resize object'), 0)
                self.showResizeHelp = True
            else:
                if self.showResizeHelp:
                    self.parent.SetStatusText('', 0)
                    self.SetCursor(self.cursors["default"])
                    self.showResizeHelp = False

    def OnLeftDown(self, event):
        """Left mouse button pressed.

        Select objects, redraw, prepare for moving/resizing.
        """
        self.mouse['begin'] = event.GetPosition()
        self.begin = self.mouse['begin']

        # select
        if self.mouse['use'] == 'pointer':
            found = self.pdcObj.FindObjects(
                self.mouse['begin'][0],
                self.mouse['begin'][1])
            foundResize = self.pdcTmp.FindObjects(
                self.mouse['begin'][0], self.mouse['begin'][1])

            if foundResize and foundResize[0] in (
                    self.idResizeBoxTmp,) + self.idLinePointsTmp:
                self.mouse['use'] = 'resize'

                # when resizing, proportions match region
                if self.instruction[self.dragId].type == 'map':
                    self.constraint = False
                    self.mapBounds = self.pdcObj.GetIdBounds(self.dragId)
                    if self.instruction[self.dragId]['scaleType'] in (0, 1, 2):
                        self.constraint = True
                        self.mapBounds = self.pdcObj.GetIdBounds(self.dragId)

                if self.instruction[self.dragId].type == 'line':
                    self.currentLinePoint = self.idLinePointsTmp.index(
                        foundResize
                        [0])

            elif found:
                self.dragId = found[0]
                self.RedrawSelectBox(self.dragId)
                if self.instruction[
                        self.dragId].type not in (
                        'map', 'rectangle'):
                    self.pdcTmp.RemoveId(self.idResizeBoxTmp)
                    self.Refresh()
                if self.instruction[self.dragId].type != 'line':
                    for id in self.idLinePointsTmp:
                        self.pdcTmp.RemoveId(id)
                    self.Refresh()

            else:
                self.dragId = -1
                self.pdcTmp.RemoveId(self.idBoxTmp)
                self.pdcTmp.RemoveId(self.idResizeBoxTmp)
                for id in self.idLinePointsTmp:
                    self.pdcTmp.RemoveId(id)
                self.Refresh()

    def OnLeftUp(self, event):
        """Left mouse button released.

        Recalculate zooming/resizing/moving and redraw.
        """
        # zoom in, zoom out
        if self.mouse['use'] in ('zoomin', 'zoomout'):
            zoomR = self.pdcTmp.GetIdBounds(self.idZoomBoxTmp)
            self.pdcTmp.RemoveId(self.idZoomBoxTmp)
            self.Refresh()
            zoomFactor, view = self.ComputeZoom(zoomR)
            self.Zoom(zoomFactor, view)

        # draw map frame
        if self.mouse['use'] == 'addMap':
            rectTmp = self.pdcTmp.GetIdBounds(self.idZoomBoxTmp)
            # too small rectangle, it's usually some mistake
            if rectTmp.GetWidth() < 20 or rectTmp.GetHeight() < 20:
                self.pdcTmp.RemoveId(self.idZoomBoxTmp)
                self.Refresh()
                return
            rectPaper = self.CanvasPaperCoordinates(
                rect=rectTmp, canvasToPaper=True)

            dlg = MapDialog(
                parent=self.parent, id=[None, None, None],
                settings=self.instruction, rect=rectPaper)
            self.openDialogs['map'] = dlg
            self.openDialogs['map'].Show()

            self.parent.toolbar.SelectDefault()
            return

        # resize resizable objects (map, line, rectangle)
        if self.mouse['use'] == 'resize':
            mapObj = self.instruction.FindInstructionByType('map')
            if not mapObj:
                mapObj = self.instruction.FindInstructionByType('initMap')
            mapId = mapObj.id

            if self.dragId == mapId:
                # necessary to change either map frame (scaleType 0,1,2) or
                # region (scaletype 3)
                newRectCanvas = self.pdcObj.GetIdBounds(mapId)
                newRectPaper = self.CanvasPaperCoordinates(
                    rect=newRectCanvas, canvasToPaper=True)
                self.instruction[mapId]['rect'] = newRectPaper

                if self.instruction[mapId]['scaleType'] in (0, 1, 2):
                    if self.instruction[mapId]['scaleType'] == 0:

                        scale, foo, rect = AutoAdjust(
                            self, scaleType=0, map=self.instruction[mapId]
                            ['map'],
                            mapType=self.instruction[mapId]['mapType'],
                            rect=self.instruction[mapId]['rect'])

                    elif self.instruction[mapId]['scaleType'] == 1:
                        scale, foo, rect = AutoAdjust(
                            self, scaleType=1,
                            region=self.instruction[mapId]['region'],
                            rect=self.instruction[mapId]['rect'])
                    else:
                        scale, foo, rect = AutoAdjust(
                            self, scaleType=2, rect=self.instruction[mapId]['rect'])
                    self.instruction[mapId]['rect'] = rect
                    self.instruction[mapId]['scale'] = scale

                    rectCanvas = self.CanvasPaperCoordinates(
                        rect=rect, canvasToPaper=False)
                    self.Draw(
                        pen=self.pen['map'],
                        brush=self.brush['map'],
                        pdc=self.pdcObj,
                        drawid=mapId,
                        pdctype='rectText',
                        bb=rectCanvas)

                elif self.instruction[mapId]['scaleType'] == 3:
                    ComputeSetRegion(
                        self, mapDict=self.instruction[mapId].GetInstruction())
                # check resolution
                SetResolution(dpi=self.instruction[mapId]['resolution'],
                              width=self.instruction[mapId]['rect'].width,
                              height=self.instruction[mapId]['rect'].height)

                self.RedrawSelectBox(mapId)
                self.Zoom(zoomFactor=1, view=(0, 0))

            elif self.instruction[self.dragId].type == 'line':
                points = self.instruction[self.dragId]['where']
                self.instruction[
                    self.dragId]['rect'] = Rect2DPP(
                    points[0], points[1])
                self.RecalculatePosition(ids=[self.dragId])

            elif self.instruction[self.dragId].type == 'rectangle':
                self.RecalculatePosition(ids=[self.dragId])

            self.mouse['use'] = 'pointer'

        # recalculate the position of objects after dragging
        if self.mouse['use'] in ('pointer', 'resize') and self.dragId != -1:
            if self.mouse['begin'] != event.GetPosition():  # for double click

                self.RecalculatePosition(ids=[self.dragId])
                if self.instruction[self.dragId].type in self.openDialogs:
                    self.openDialogs[
                        self.instruction[
                            self.dragId].type].updateDialog()

        elif self.mouse['use'] in ('addPoint', 'addLine', 'addRectangle'):
            endCoordinates = self.CanvasPaperCoordinates(rect=Rect(
                event.GetX(), event.GetY(), 0, 0), canvasToPaper=True)[:2]

            diffX = event.GetX() - self.mouse['begin'][0]
            diffY = event.GetY() - self.mouse['begin'][1]

            if self.mouse['use'] == 'addPoint':
                self.parent.AddPoint(coordinates=endCoordinates)
            elif self.mouse['use'] in ('addLine', 'addRectangle'):
                # not too small lines/rectangles
                if sqrt(diffX * diffX + diffY * diffY) < 5:
                    self.pdcTmp.RemoveId(self.idZoomBoxTmp)
                    self.Refresh()
                    return

                beginCoordinates = self.CanvasPaperCoordinates(
                    rect=Rect(
                        self.mouse['begin'][0],
                        self.mouse['begin'][1],
                        0, 0),
                    canvasToPaper=True)[
                    : 2]
                if self.mouse['use'] == 'addLine':
                    self.parent.AddLine(
                        coordinates=[
                            beginCoordinates,
                            endCoordinates])
                else:
                    self.parent.AddRectangle(
                        coordinates=[
                            beginCoordinates,
                            endCoordinates])
                self.pdcTmp.RemoveId(self.idZoomBoxTmp)
                self.Refresh()

    def OnButtonDClick(self, event):
        """Open object dialog for editing."""
        if self.mouse['use'] == 'pointer' and self.dragId != -1:
            itemCall = {'text': self.parent.OnAddText,
                        'mapinfo': self.parent.OnAddMapinfo,
                        'scalebar': self.parent.OnAddScalebar,
                        'image': self.parent.OnAddImage,
                        'northArrow': self.parent.OnAddNorthArrow,
                        'point': self.parent.AddPoint,
                        'line': self.parent.AddLine,
                        'rectangle': self.parent.AddRectangle,
                        'rasterLegend': self.parent.OnAddLegend,
                        'vectorLegend': self.parent.OnAddLegend,
                        'map': self.parent.OnAddMap}

            itemArg = {'text': dict(event=None, id=self.dragId),
                       'mapinfo': dict(event=None),
                       'scalebar': dict(event=None),
                       'image': dict(event=None, id=self.dragId),
                       'northArrow': dict(event=None, id=self.dragId),
                       'point': dict(id=self.dragId),
                       'line': dict(id=self.dragId),
                       'rectangle': dict(id=self.dragId),
                       'rasterLegend': dict(event=None),
                       'vectorLegend': dict(event=None, page=1),
                       'map': dict(event=None, notebook=True)}

            type = self.instruction[self.dragId].type
            itemCall[type](**itemArg[type])

    def OnDragging(self, event):
        """Process panning/resizing/drawing/moving."""
        if event.MiddleIsDown():
            # panning
            self.mouse['end'] = event.GetPosition()
            self.Pan(begin=self.mouse['begin'], end=self.mouse['end'])
            self.mouse['begin'] = event.GetPosition()

        elif event.LeftIsDown():
            # draw box when zooming, creating map
            if self.mouse['use'] in (
                    'zoomin', 'zoomout', 'addMap', 'addLine', 'addRectangle'):
                self.mouse['end'] = event.GetPosition()
                r = Rect(
                    self.mouse['begin'][0],
                    self.mouse['begin'][1],
                    self.mouse['end'][0] -
                    self.mouse['begin'][0],
                    self.mouse['end'][1] -
                    self.mouse['begin'][1])
                r = self.modifyRectangle(r)

                if self.mouse['use'] in ('addLine', 'addRectangle'):
                    if self.mouse['use'] == 'addLine':
                        pdcType = 'line'
                        lineCoords = (self.mouse['begin'], self.mouse['end'])
                    else:
                        pdcType = 'rect'
                        lineCoords = None
                        if r[2] < 2 or r[3] < 2:
                            # to avoid strange behavoiur
                            return

                    self.Draw(pen=self.pen['line'], brush=self.brush['line'],
                              pdc=self.pdcTmp, drawid=self.idZoomBoxTmp,
                              pdctype=pdcType, bb=r, lineCoords=lineCoords)

                else:
                    self.Draw(pen=self.pen['box'], brush=self.brush['box'],
                              pdc=self.pdcTmp, drawid=self.idZoomBoxTmp,
                              pdctype='rect', bb=r)

            # panning
            if self.mouse["use"] == 'pan':
                self.mouse['end'] = event.GetPosition()
                self.Pan(begin=self.mouse['begin'], end=self.mouse['end'])
                self.mouse['begin'] = event.GetPosition()

            # move object
            if self.mouse['use'] == 'pointer' and self.dragId != -1:
                self.mouse['end'] = event.GetPosition()
                dx, dy = self.mouse['end'][
                    0] - self.begin[0], self.mouse['end'][1] - self.begin[1]
                self.pdcObj.TranslateId(self.dragId, dx, dy)
                self.pdcTmp.TranslateId(self.idBoxTmp, dx, dy)
                self.pdcTmp.TranslateId(self.idResizeBoxTmp, dx, dy)
                for id in self.idLinePointsTmp:
                    self.pdcTmp.TranslateId(id, dx, dy)
                if self.instruction[self.dragId].type == 'text':
                    self.instruction[self.dragId]['coords'] = self.instruction[self.dragId][
                        'coords'][0] + dx, self.instruction[self.dragId]['coords'][1] + dy
                self.begin = event.GetPosition()
                self.Refresh()

            # resize object
            if self.mouse['use'] == 'resize':
                pos = event.GetPosition()
                diffX = pos[0] - self.mouse['begin'][0]
                diffY = pos[1] - self.mouse['begin'][1]
                if self.instruction[self.dragId].type == 'map':
                    x, y = self.mapBounds.GetX(), self.mapBounds.GetY()
                    width, height = self.mapBounds.GetWidth(), self.mapBounds.GetHeight()
                    # match given region
                    if self.constraint:
                        if width > height:
                            newWidth = width + diffX
                            newHeight = height + diffX * \
                                (float(height) / width)
                        else:
                            newWidth = width + diffY * (float(width) / height)
                            newHeight = height + diffY
                    else:
                        newWidth = width + diffX
                        newHeight = height + diffY

                    if newWidth < 10 or newHeight < 10:
                        return

                    bounds = Rect(x, y, newWidth, newHeight)
                    self.Draw(
                        pen=self.pen['map'],
                        brush=self.brush['map'],
                        pdc=self.pdcObj,
                        drawid=self.dragId,
                        pdctype='rectText',
                        bb=bounds)

                elif self.instruction[self.dragId].type == 'rectangle':
                    instr = self.instruction[self.dragId]
                    rect = self.CanvasPaperCoordinates(
                        rect=instr['rect'], canvasToPaper=False)
                    rect.SetWidth(rect.GetWidth() + diffX)
                    rect.SetHeight(rect.GetHeight() + diffY)

                    if rect.GetWidth() < 5 or rect.GetHeight() < 5:
                        return

                    self.DrawGraphics(
                        drawid=self.dragId,
                        shape='rectangle',
                        color=instr['color'],
                        fcolor=instr['fcolor'],
                        width=instr['width'],
                        bb=rect)

                elif self.instruction[self.dragId].type == 'line':
                    instr = self.instruction[self.dragId]
                    points = instr['where']
                    # moving point
                    if self.currentLinePoint == 0:
                        pPaper = points[1]
                    else:
                        pPaper = points[0]
                    pCanvas = self.CanvasPaperCoordinates(
                        rect=Rect2DPS(pPaper, (0, 0)), canvasToPaper=False)[:2]
                    bounds = wx.Rect(pCanvas, pos)
                    self.DrawGraphics(
                        drawid=self.dragId,
                        shape='line',
                        color=instr['color'],
                        width=instr['width'],
                        bb=bounds,
                        lineCoords=(
                            pos,
                            pCanvas))

                    # update paper coordinates
                    points[self.currentLinePoint] = self.CanvasPaperCoordinates(
                        rect=Rect(pos[0], pos[1], 0, 0), canvasToPaper=True)[:2]

                self.RedrawSelectBox(self.dragId)

    def OnMiddleDown(self, event):
        """Middle mouse button pressed."""
        self.mouse['begin'] = event.GetPosition()

    def Pan(self, begin, end):
        """Move canvas while dragging.

        :param begin: x,y coordinates of first point
        :param end: x,y coordinates of second point
        """
        view = begin[0] - end[0], begin[1] - end[1]
        zoomFactor = 1
        self.Zoom(zoomFactor, view)

    def RecalculatePosition(self, ids):
        for id in ids:
            itype = self.instruction[id].type
            if itype in ('map', 'rectangle'):
                self.instruction[id]['rect'] = self.CanvasPaperCoordinates(
                    rect=self.pdcObj.GetIdBounds(id), canvasToPaper=True)
                self.RecalculateEN()

            elif itype in ('mapinfo', 'rasterLegend', 'vectorLegend', 'image', 'northArrow'):
                self.instruction[id]['rect'] = self.CanvasPaperCoordinates(
                    rect=self.pdcObj.GetIdBounds(id), canvasToPaper=True)
                self.instruction[id]['where'] = self.CanvasPaperCoordinates(
                    rect=self.pdcObj.GetIdBounds(id), canvasToPaper=True)[:2]
                if itype in ('image', 'northArrow'):
                    self.RecalculateEN()

            elif itype == 'point':
                rect = self.pdcObj.GetIdBounds(id)
                self.instruction[id]['rect'] = self.CanvasPaperCoordinates(
                    rect=rect, canvasToPaper=True)
                rect.Offset(
                    dx=rect.GetWidth() / 2, dy=rect.GetHeight() / 2,
                )
                self.instruction[id]['where'] = self.CanvasPaperCoordinates(
                    rect=rect, canvasToPaper=True)[: 2]
                self.RecalculateEN()

            elif itype == 'line':
                rect = self.pdcObj.GetIdBounds(id)
                oldRect = self.instruction[id]['rect']
                newRect = self.CanvasPaperCoordinates(
                    rect=rect, canvasToPaper=True)
                xDiff = newRect[0] - oldRect[0]
                yDiff = newRect[1] - oldRect[1]
                self.instruction[id]['rect'] = newRect

                point1 = wx.Point2D(*self.instruction[id]['where'][0])
                point2 = wx.Point2D(*self.instruction[id]['where'][1])
                point1 += wx.Point2D(xDiff, yDiff)
                point2 += wx.Point2D(xDiff, yDiff)
                self.instruction[id]['where'] = [point1, point2]

                self.RecalculateEN()

            elif itype == 'scalebar':
                self.instruction[id]['rect'] = self.CanvasPaperCoordinates(
                    rect=self.pdcObj.GetIdBounds(id), canvasToPaper=True)

                self.instruction[id]['where'] = self.instruction[
                    id]['rect'].GetCentre()

            elif itype == 'text':
                x, y = self.instruction[id]['coords'][0] - self.instruction[id]['xoffset'],\
                    self.instruction[id]['coords'][1] + self.instruction[id]['yoffset']
                extent = self.parent.getTextExtent(
                    textDict=self.instruction[id])
                if self.instruction[id]['rotate'] is not None:
                    rot = float(self.instruction[id]['rotate']) / 180 * pi
                else:
                    rot = 0

                if self.instruction[id]['ref'].split()[0] == 'lower':
                    y += extent[1]
                elif self.instruction[id]['ref'].split()[0] == 'center':
                    y += extent[1] / 2
                if self.instruction[id]['ref'].split()[1] == 'right':
                    x += extent[0] * cos(rot)
                    y -= extent[0] * sin(rot)
                elif self.instruction[id]['ref'].split()[1] == 'center':
                    x += extent[0] / 2 * cos(rot)
                    y -= extent[0] / 2 * sin(rot)

                self.instruction[id]['where'] = self.CanvasPaperCoordinates(
                    rect=Rect2D(x, y, 0, 0), canvasToPaper=True)[:2]
                self.RecalculateEN()

    def ComputeZoom(self, rect):
        """Computes zoom factor and scroll view"""
        zoomFactor = 1
        cW, cH = self.GetClientSize()
        cW = float(cW)
        if rect.IsEmpty():  # clicked on canvas
            zoomFactor = 1.5
            if self.mouse['use'] == 'zoomout':
                zoomFactor = 1. / zoomFactor
            x, y = self.mouse['begin']
            xView = x - x / zoomFactor  # x - cW/(zoomFactor * 2)
            yView = y - y / zoomFactor  # y - cH/(zoomFactor * 2)

        else:  # dragging
            rW, rH = float(rect.GetWidth()), float(rect.GetHeight())
            try:
                zoomFactor = 1 / max(rW / cW, rH / cH)
            except ZeroDivisionError:
                zoomFactor = 1
            # when zooming to full extent, in some cases, there was zoom
            # 1.01..., which causes problem
            if abs(zoomFactor - 1) > 0.01:
                zoomFactor = zoomFactor
            else:
                zoomFactor = 1.

            if self.mouse['use'] == 'zoomout':
                zoomFactor = min(rW / cW, rH / cH)
            try:
                if rW / rH > cW / cH:
                    yView = rect.GetY() - (rW * (cH / cW) - rH) / 2
                    xView = rect.GetX()

                    if self.mouse['use'] == 'zoomout':
                        x, y = rect.GetX() + (rW - (cW / cH) * rH) / 2, rect.GetY()
                        xView, yView = -x, -y
                else:
                    xView = rect.GetX() - (rH * (cW / cH) - rW) / 2
                    yView = rect.GetY()
                    if self.mouse['use'] == 'zoomout':
                        x, y = rect.GetX(), rect.GetY() + (rH - (cH / cW) * rW) / 2
                        xView, yView = -x, -y
            except ZeroDivisionError:
                xView, yView = rect.GetX(), rect.GetY()
        return zoomFactor, (int(xView), int(yView))

    def Zoom(self, zoomFactor, view):
        """Zoom to specified region, scroll view, redraw"""
        if not self.currScale:
            return
        self.currScale = self.currScale * zoomFactor

        if self.currScale > 10 or self.currScale < 0.1:
            self.currScale = self.currScale / zoomFactor
            return
        if not self.preview:
            # redraw paper
            pRect = self.pdcPaper.GetIdBounds(self.pageId)
            if globalvar.wxPythonPhoenix:
                pRect.Offset(-view[0], -view[1])
            else:
                pRect.OffsetXY(-view[0], -view[1])
            pRect = self.ScaleRect(rect=pRect, scale=zoomFactor)
            self.DrawPaper(pRect)

            # redraw objects
            for id in self.objectId:
                type = self.instruction[id].type
                if type == 'labels':  # why it's here? it should not
                    continue
                oRect = self.CanvasPaperCoordinates(
                    rect=self.instruction[id]['rect'], canvasToPaper=False)

                if type == 'text':
                    # recalculate coordinates, they are not equal to BB
                    coords = self.instruction[id]['coords']
                    self.instruction[id]['coords'] = coords = [
                        (int(coord) - view[i]) * zoomFactor for i, coord in enumerate(coords)]
                    extent = self.parent.getTextExtent(
                        textDict=self.instruction[id])
                    if self.instruction[id]['rotate']:
                        rot = float(self.instruction[id]['rotate'])
                    else:
                        rot = 0
                    self.instruction[id]['rect'] = bounds = self.parent.getModifiedTextBounds(
                        coords[0], coords[1], extent, rot)
                    self.DrawRotText(
                        pdc=self.pdcObj,
                        drawId=id,
                        textDict=self.instruction[id],
                        coords=coords,
                        bounds=bounds)

                    self.pdcObj.SetIdBounds(id, bounds)

                elif type == 'northArrow':
                    self.Draw(
                        pen=self.pen[type],
                        brush=self.brush[type],
                        pdc=self.pdcObj,
                        drawid=id,
                        pdctype='bitmap',
                        bb=oRect)

                elif type in ('point', 'line', 'rectangle'):
                    instr = self.instruction[id]
                    color = self.instruction[id]['color']
                    width = fcolor = coords = None

                    if type in ('point', 'rectangle'):
                        fcolor = self.instruction[id]['fcolor']
                    if type in ('line', 'rectangle'):
                        width = self.instruction[id]['width']
                    if type in ('line'):
                        point1, point2 = instr['where'][0], instr['where'][1]
                        point1 = self.CanvasPaperCoordinates(
                            rect=Rect2DPS(point1, (0, 0)), canvasToPaper=False)[:2]
                        point2 = self.CanvasPaperCoordinates(
                            rect=Rect2DPS(point2, (0, 0)), canvasToPaper=False)[:2]
                        coords = (point1, point2)

                    self.DrawGraphics(
                        drawid=id,
                        shape=type,
                        bb=oRect,
                        lineCoords=coords,
                        color=color,
                        fcolor=fcolor,
                        width=width)

                else:
                    self.Draw(
                        pen=self.pen[type],
                        brush=self.brush[type],
                        pdc=self.pdcObj,
                        drawid=id,
                        pdctype='rectText',
                        bb=oRect)
            # redraw tmp objects
            if self.dragId != -1:
                self.RedrawSelectBox(self.dragId)

        # redraw preview
        else:  # preview mode
            imageRect = self.pdcImage.GetIdBounds(self.imageId)
            if globalvar.wxPythonPhoenix:
                imageRect.Offset(-view[0], -view[1])
            else:
                imageRect.OffsetXY(-view[0], -view[1])
            imageRect = self.ScaleRect(rect=imageRect, scale=zoomFactor)
            self.DrawImage(imageRect)

    def ZoomAll(self):
        """Zoom to full extent"""
        if not self.preview:
            bounds = self.pdcPaper.GetIdBounds(self.pageId)
        else:
            bounds = self.pdcImage.GetIdBounds(self.imageId)
        zoomP = bounds.Inflate(bounds.width / 20, bounds.height / 20)
        zoomFactor, view = self.ComputeZoom(zoomP)
        self.Zoom(zoomFactor, view)

    def Draw(self, pen, brush, pdc, drawid=None, pdctype='rect',
             bb=Rect(0, 0, 0, 0), lineCoords=None):
        """Draw object with given pen and brush.

        :param pdc: PseudoDC
        :param pdctype: 'bitmap'/'rectText'/'rect'/'point'/'line'
        :param bb: bounding box
        :param lineCoords: coordinates of line start, end points (wx.Point, wx.Point)
        """
        if drawid is None:
            drawid = NewId()
        bb = bb.Get()
        pdc.BeginDrawing()
        pdc.RemoveId(drawid)
        pdc.SetId(drawid)
        pdc.SetPen(pen)
        pdc.SetBrush(brush)

        if pdctype == 'bitmap':
            if havePILImage:
                file = self.instruction[drawid]['epsfile']
                rotation = self.instruction[drawid]['rotate']
                self.DrawBitmap(
                    pdc=pdc,
                    filePath=file,
                    rotation=rotation,
                    bbox=bb)
            else:  # draw only rectangle with label
                pdctype = 'rectText'

        if pdctype in ('rect', 'rectText'):
            pdc.DrawRectangle(*bb)

        if pdctype == 'rectText':
            # dc created because of method GetTextExtent, which pseudoDC lacks
            dc = ClientDC(self)
            font = dc.GetFont()
            size = 10
            font.SetPointSize(size)
            font.SetStyle(wx.ITALIC)
            dc.SetFont(font)
            pdc.SetFont(font)
            text = '\n'.join(self.itemLabels[drawid])
            w, h, lh = dc.GetFullMultiLineTextExtent(text)
            textExtent = (w, h)
            textRect = Rect(0, 0, *textExtent).CenterIn(bb)
            r = map(int, bb)
            while not Rect(*r).ContainsRect(textRect) and size >= 8:
                size -= 2
                font.SetPointSize(size)
                dc.SetFont(font)
                pdc.SetFont(font)
                textExtent = dc.GetTextExtent(text)
                textRect = Rect(0, 0, *textExtent).CenterIn(bb)
            pdc.SetTextForeground(wx.Colour(100, 100, 100, 200))
            pdc.SetBackgroundMode(wx.TRANSPARENT)
            pdc.DrawLabel(text=text, rect=textRect)

        elif pdctype == 'point':
            pdc.DrawCircle(x=bb[0] + bb[2] / 2,
                           y=bb[1] + bb[3] / 2,
                           radius=bb[2] / 2)

        elif pdctype == 'line':
            pdc.DrawLinePoint(lineCoords[0], lineCoords[1])

        pdc.SetIdBounds(drawid, bb)
        pdc.EndDrawing()
        self.Refresh()

        return drawid

    def DrawGraphics(self, drawid, shape, color, bb,
                     width=None, fcolor=None, lineCoords=None):
        """Draw point/line/rectangle with given color and width

        :param drawid: id of drawn object
        :param shape: drawn shape 'point'/'line'/'rectangle'
        :param color: pen outline color ('RRR:GGG:BBB')
        :param fcolor: brush fill color, if meaningful ('RRR:GGG:BBB')
        :param width: pen width
        :param bb: bounding box
        :param lineCoords: line coordinates (for line only)
        """
        pdctype = {'point': 'point',
                   'line': 'line',
                   'rectangle': 'rect'}

        if color == 'none':
            pen = wx.TRANSPARENT_PEN
        else:
            if width is not None:
                units = UnitConversion(self)
                width = int(
                    units.convert(
                        value=width,
                        fromUnit='point',
                        toUnit='pixel') *
                    self.currScale)
            else:
                width = 2
            pen = wx.Pen(colour=convertRGB(color), width=width)
            pen.SetCap(wx.CAP_BUTT)  # this is how ps.map draws

        brush = wx.TRANSPARENT_BRUSH
        if fcolor and fcolor != 'none':
            brush = wx.Brush(colour=convertRGB(fcolor))

        self.Draw(
            pen=pen,
            brush=brush,
            pdc=self.pdcObj,
            pdctype=pdctype[shape],
            drawid=drawid,
            bb=bb,
            lineCoords=lineCoords)

    def DrawBitmap(self, pdc, filePath, rotation, bbox):
        """Draw bitmap using PIL"""
        pImg = PILImage.open(filePath)
        if sys.platform == 'win32' and \
           'eps' in os.path.splitext(filePath)[1].lower():
            import types
            pImg.load = types.MethodType(loadPSForWindows, pImg)

        if rotation:
            # get rid of black background
            pImg = pImg.convert("RGBA")
            rot = pImg.rotate(rotation, expand=1)
            new = PILImage.new('RGBA', rot.size, (255,) * 4)
            pImg = PILImage.composite(rot, new, rot)
        pImg = pImg.resize(
            (int(
                bbox[2]), int(
                bbox[3])), resample=PILImage.BICUBIC)
        img = PilImageToWxImage(pImg)
        bitmap = img.ConvertToBitmap()
        mask = wx.Mask(bitmap, wx.WHITE)
        bitmap.SetMask(mask)
        pdc.DrawBitmap(bitmap, bbox[0], bbox[1], useMask=True)

    def DrawRotText(self, pdc, drawId, textDict, coords, bounds):
        if textDict['rotate']:
            rot = float(textDict['rotate'])
        else:
            rot = 0

        if textDict['background'] != 'none':
            background = textDict['background']
        else:
            background = None

        pdc.RemoveId(drawId)
        pdc.SetId(drawId)
        pdc.BeginDrawing()

        # border is not redrawn when zoom changes, why?
# if textDict['border'] != 'none' and not rot:
##            units = UnitConversion(self)
# borderWidth = units.convert(value = textDict['width'],
# fromUnit = 'point', toUnit = 'pixel' ) * self.currScale
##            pdc.SetPen(wx.Pen(colour = convertRGB(textDict['border']), width = borderWidth))
# pdc.DrawRectangle(*bounds)

        if background:
            pdc.SetTextBackground(convertRGB(background))
            pdc.SetBackgroundMode(wx.SOLID)
        else:
            pdc.SetBackgroundMode(wx.TRANSPARENT)

        fn = self.parent.makePSFont(textDict)

        pdc.SetFont(fn)
        pdc.SetTextForeground(convertRGB(textDict['color']))
        if rot == 0:
            pdc.DrawLabel(text=textDict['text'], rect=bounds)
        else:
            pdc.DrawRotatedText(textDict['text'], coords[0], coords[1], rot)

        pdc.SetIdBounds(drawId, Rect(*bounds))
        self.Refresh()
        pdc.EndDrawing()

    def DrawImage(self, rect):
        """Draw preview image to pseudoDC"""
        self.pdcImage.ClearId(self.imageId)
        self.pdcImage.SetId(self.imageId)
        img = self.image

        if img.GetWidth() != rect.width or img.GetHeight() != rect.height:
            img = img.Scale(rect.width, rect.height)
        bitmap = img.ConvertToBitmap()

        self.pdcImage.BeginDrawing()
        self.pdcImage.DrawBitmap(bitmap, rect.x, rect.y)
        self.pdcImage.SetIdBounds(self.imageId, rect)
        self.pdcImage.EndDrawing()
        self.Refresh()

    def DrawPaper(self, rect):
        """Draw paper and margins"""
        page = self.instruction[self.pageId]
        scale = page['Width'] / rect.GetWidth()
        w = (page['Width'] - page['Right'] - page['Left']) / scale
        h = (page['Height'] - page['Top'] - page['Bottom']) / scale
        x = page['Left'] / scale + rect.GetX()
        y = page['Top'] / scale + rect.GetY()

        self.pdcPaper.BeginDrawing()
        self.pdcPaper.RemoveId(self.pageId)
        self.pdcPaper.SetId(self.pageId)
        self.pdcPaper.SetPen(self.pen['paper'])
        self.pdcPaper.SetBrush(self.brush['paper'])
        self.pdcPaper.DrawRectangleRect(rect)

        self.pdcPaper.SetPen(self.pen['margins'])
        self.pdcPaper.SetBrush(self.brush['margins'])
        self.pdcPaper.DrawRectangle(x, y, w, h)

        self.pdcPaper.SetIdBounds(self.pageId, rect)
        self.pdcPaper.EndDrawing()
        self.Refresh()

    def ImageRect(self):
        """Returns image centered in canvas, computes scale"""
        img = wx.Image(self.imgName, wx.BITMAP_TYPE_PNG)
        cW, cH = self.GetClientSize()
        iW, iH = img.GetWidth(), img.GetHeight()

        self.currScale = min(float(cW) / iW, float(cH) / iH)
        iW = iW * self.currScale
        iH = iH * self.currScale
        x = cW / 2 - iW / 2
        y = cH / 2 - iH / 2
        imageRect = Rect(x, y, iW, iH)

        return imageRect

    def RedrawSelectBox(self, id):
        """Redraws select box when selected object changes its size"""
        if self.dragId == id:
            rect = self.pdcObj.GetIdBounds(id)
            if self.instruction[id].type != 'line':
                rect = rect.Inflate(3, 3)
            # draw select box around object
            self.Draw(
                pen=self.pen['select'],
                brush=self.brush['select'],
                pdc=self.pdcTmp,
                drawid=self.idBoxTmp,
                pdctype='rect',
                bb=rect)

            # draw small marks signalizing resizing
            if self.instruction[id].type in ('map', 'rectangle'):
                controlP = self.pdcObj.GetIdBounds(id).GetBottomRight()
                rect = Rect(controlP[0], controlP[1], self.resizeBoxSize[0], self.resizeBoxSize[1])
                self.Draw(
                    pen=self.pen['resize'],
                    brush=self.brush['resize'],
                    pdc=self.pdcTmp,
                    drawid=self.idResizeBoxTmp,
                    pdctype='rect',
                    bb=rect)

            elif self.instruction[id].type == 'line':
                p1Paper = self.instruction[id]['where'][0]
                p2Paper = self.instruction[id]['where'][1]
                p1Canvas = self.CanvasPaperCoordinates(
                    rect=Rect2DPS(p1Paper, (0, 0)), canvasToPaper=False)[:2]
                p2Canvas = self.CanvasPaperCoordinates(
                    rect=Rect2DPS(p2Paper, (0, 0)), canvasToPaper=False)[:2]
                rect = []
                box = Rect(0, 0, self.resizeBoxSize[0], self.resizeBoxSize[1])
                rect.append(box.CenterIn(Rect(p1Canvas[0], p1Canvas[1], 0, 0)))
                rect.append(box.CenterIn(Rect(p2Canvas[0], p2Canvas[1], 0, 0)))
                for i, point in enumerate((p1Canvas, p2Canvas)):
                    self.Draw(
                        pen=self.pen['resize'],
                        brush=self.brush['resize'],
                        pdc=self.pdcTmp,
                        drawid=self.idLinePointsTmp[i],
                        pdctype='rect',
                        bb=rect[i])

    def UpdateMapLabel(self):
        """Updates map frame label"""

        vector = self.instruction.FindInstructionByType('vector')
        if vector:
            vectorId = vector.id
        else:
            vectorId = None

        raster = self.instruction.FindInstructionByType('raster')
        if raster:
            rasterId = raster.id
        else:
            rasterId = None

        rasterName = 'None'
        if rasterId:
            rasterName = self.instruction[rasterId]['raster'].split('@')[0]

        mapId = self.instruction.FindInstructionByType('map').id
        self.itemLabels[mapId] = []
        self.itemLabels[mapId].append(self.itemLabelsDict['map'])
        self.itemLabels[mapId].append("raster: " + rasterName)
        if vectorId:
            for map in self.instruction[vectorId]['list']:
                self.itemLabels[mapId].append(
                    'vector: ' + map[0].split('@')[0])

        labels = self.instruction.FindInstructionByType('labels')
        if labels:
            labelFiles = self.instruction[labels.id]['labels']
            if not labelFiles:
                return
            labelFiles = [lFile.split('@')[0] for lFile in labelFiles]
            self.itemLabels[mapId].append(
                _("labels: ") + ', '.join(labelFiles))

    def UpdateLabel(self, itype, id):
        self.itemLabels[id] = []
        self.itemLabels[id].append(self.itemLabelsDict[itype])
        if itype == 'image':
            file = os.path.basename(self.instruction[id]['epsfile'])
            self.itemLabels[id].append(file)

    def OnSize(self, event):
        """Init image size to match window size
        """
        # not zoom all when notebook page is changed
        if self.preview and self.parent.currentPage == 1 or not self.preview and self.parent.currentPage == 0:
            self.ZoomAll()
        self.OnIdle(None)
        event.Skip()

    def OnIdle(self, event):
        """Only re-render a image during idle time instead of
        multiple times during resizing.
        """

        width, height = self.GetClientSize()
        # Make new off screen bitmap: this bitmap will always have the
        # current drawing in it, so it can be used to save the image
        # to a file, or whatever.
        width = max(width, 20)
        height = max(height, 20)
        self._buffer = EmptyBitmap(width, height)
        # re-render image on idle
        self.resize = True

    def ScaleRect(self, rect, scale):
        """Scale rectangle"""
        return Rect(rect.GetLeft() * scale, rect.GetTop() * scale,
                       rect.GetSize()[0] * scale, rect.GetSize()[1] * scale)