Geografic-Information-System/gui/wxpython/gui_modules/mapdisp.py

"""!
@package mapdisp.py

@brief Map display with toolbar for various display management
functions, and additional toolbars (vector digitizer, 3d view).

Can be used either from Layer Manager or as d.mon backend.

Classes:
- MapFrame
- MapApp

Usage:
python mapdisp.py monitor-identifier /path/to/map/file /path/to/command/file /path/to/env/file

(C) 2006-2011 by 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 Michael Barton
@author Jachym Cepicky
@author Martin Landa <landa.martin gmail.com>
"""

import os
import sys
import glob
import math
import tempfile
import copy

import globalvar
import wx
import wx.aui

sys.path.append(os.path.join(globalvar.ETCWXDIR, "icons"))
sys.path.append(os.path.join(globalvar.ETCDIR,   "python"))

import render
import toolbars
import menuform
import gselect
import disp_print
import gcmd
import dbm
import dbm_dialogs
import histogram
import profile
import globalvar
import utils
import gdialogs
from debug       import Debug
from icon        import Icons
from preferences import globalSettings as UserSettings

from mapdisp_command import Command
from mapdisp_window  import BufferedWindow

from grass.script import core as grass

# for standalone app
monFile = { 'cmd' : None,
            'map' : None,
            'env' : None,
            }
monName = None

haveCtypes = False

class MapFrame(wx.Frame):
    """!Main frame for map display window. Drawing takes place in
    child double buffered drawing window.
    """
    def __init__(self, parent = None, id = wx.ID_ANY, title = _("GRASS GIS - Map display"),
                 style = wx.DEFAULT_FRAME_STYLE, toolbars = ["map"],
                 tree = None, notebook = None, lmgr = None, page = None,
                 Map = None, auimgr = None, **kwargs):
        """!Main map display window with toolbars, statusbar and
        BufferedWindow (map canvas)
        
        @param toolbars array of activated toolbars, e.g. ['map', 'digit']
        @param tree reference to layer tree
        @param notebook control book ID in Layer Manager
        @param lmgr Layer Manager
        @param page notebook page with layer tree
        @param Map instance of render.Map
        @param auimgs AUI manager
        @param kwargs wx.Frame attribures
        """
        self._layerManager = lmgr   # Layer Manager object
        self.Map        = Map       # instance of render.Map
        self.tree       = tree      # Layer Manager layer tree object
        self.page       = page      # Notebook page holding the layer tree
        self.layerbook  = notebook  # Layer Manager layer tree notebook
        self.parent     = parent
        
        if 'name' not in kwargs:
            kwargs['name'] = 'MapWindow'
        wx.Frame.__init__(self, parent, id, title, style = style, **kwargs)
        
        # available cursors
        self.cursors = {
            # default: cross
            # "default" : wx.StockCursor(wx.CURSOR_DEFAULT),
            "default" : wx.StockCursor(wx.CURSOR_ARROW),
            "cross"   : wx.StockCursor(wx.CURSOR_CROSS),
            "hand"    : wx.StockCursor(wx.CURSOR_HAND),
            "pencil"  : wx.StockCursor(wx.CURSOR_PENCIL),
            "sizenwse": wx.StockCursor(wx.CURSOR_SIZENWSE)
            }
        
        #
        # set the size & system icon
        #
        self.SetClientSize(self.GetSize())
        self.iconsize = (16, 16)

        self.SetIcon(wx.Icon(os.path.join(globalvar.ETCICONDIR, 'grass_map.ico'), wx.BITMAP_TYPE_ICO))

        #
        # Fancy gui
        #
        self._mgr = wx.aui.AuiManager(self)

        #
        # Add toolbars
        #
        self.toolbars = { 'map' : None,
                          'vdigit' : None,
                          'georect' : None, 
                          'gcpdisp' : None, 
                          'nviz' : None }
        for toolb in toolbars:
            self.AddToolbar(toolb)

        #
        # Add statusbar
        #
        self.statusbar = self.CreateStatusBar(number = 4, style = 0)
        self.statusbar.SetStatusWidths([-5, -2, -1, -1])
        self.statusbarWin = dict()
        self.statusbarWin['toggle'] = wx.Choice(self.statusbar, wx.ID_ANY,
                                                choices = globalvar.MAP_DISPLAY_STATUSBAR_MODE)
        self.statusbarWin['toggle'].SetSelection(UserSettings.Get(group = 'display',
                                                                  key = 'statusbarMode',
                                                                  subkey = 'selection'))
        self.statusbar.Bind(wx.EVT_CHOICE, self.OnToggleStatus, self.statusbarWin['toggle'])
        # auto-rendering checkbox
        self.statusbarWin['render'] = wx.CheckBox(parent = self.statusbar, id = wx.ID_ANY,
                                                  label = _("Render"))
        self.statusbar.Bind(wx.EVT_CHECKBOX, self.OnToggleRender, self.statusbarWin['render'])
        self.statusbarWin['render'].SetValue(UserSettings.Get(group = 'display',
                                                              key = 'autoRendering',
                                                              subkey = 'enabled'))
        self.statusbarWin['render'].SetToolTip(wx.ToolTip (_("Enable/disable auto-rendering")))
        # show region
        self.statusbarWin['region'] = wx.CheckBox(parent = self.statusbar, id = wx.ID_ANY,
                                                  label = _("Show computational extent"))
        self.statusbar.Bind(wx.EVT_CHECKBOX, self.OnToggleShowRegion, self.statusbarWin['region'])
        
        self.statusbarWin['region'].SetValue(False)
        self.statusbarWin['region'].Hide()
        self.statusbarWin['region'].SetToolTip(wx.ToolTip (_("Show/hide computational "
                                                             "region extent (set with g.region). "
                                                             "Display region drawn as a blue box inside the "
                                                             "computational region, "
                                                             "computational region inside a display region "
                                                             "as a red box).")))
        # set resolution
        self.statusbarWin['resolution'] = wx.CheckBox(parent = self.statusbar, id = wx.ID_ANY,
                                                      label = _("Constrain display resolution to computational settings"))
        self.statusbar.Bind(wx.EVT_CHECKBOX, self.OnToggleResolution, self.statusbarWin['resolution'])
        self.statusbarWin['resolution'].SetValue(UserSettings.Get(group = 'display', key = 'compResolution', subkey = 'enabled'))
        self.statusbarWin['resolution'].Hide()
        self.statusbarWin['resolution'].SetToolTip(wx.ToolTip (_("Constrain display resolution "
                                                                 "to computational region settings. "
                                                                 "Default value for new map displays can "
                                                                 "be set up in 'User GUI settings' dialog.")))
        # map scale
        self.statusbarWin['mapscale'] = wx.ComboBox(parent = self.statusbar, id = wx.ID_ANY,
                                                    style = wx.TE_PROCESS_ENTER,
                                                    size = (150, -1))
        self.statusbarWin['mapscale'].SetItems(['1:1000',
                                                '1:5000',
                                                '1:10000',
                                                '1:25000',
                                                '1:50000',
                                                '1:100000',
                                                '1:1000000'])
        self.statusbarWin['mapscale'].Hide()
        self.statusbar.Bind(wx.EVT_TEXT_ENTER, self.OnChangeMapScale, self.statusbarWin['mapscale'])
        self.statusbar.Bind(wx.EVT_COMBOBOX, self.OnChangeMapScale, self.statusbarWin['mapscale'])

        # go to
        self.statusbarWin['goto'] = wx.TextCtrl(parent = self.statusbar, id = wx.ID_ANY,
                                                value = "", style = wx.TE_PROCESS_ENTER,
                                                size = (300, -1))
        self.statusbarWin['goto'].Hide()
        self.statusbar.Bind(wx.EVT_TEXT_ENTER, self.OnGoTo, self.statusbarWin['goto'])

        # projection
        self.statusbarWin['projection'] = wx.CheckBox(parent = self.statusbar, id = wx.ID_ANY,
                                                      label = _("Use defined projection"))
        self.statusbarWin['projection'].SetValue(False)
        size = self.statusbarWin['projection'].GetSize()
        self.statusbarWin['projection'].SetMinSize((size[0] + 150, size[1]))
        self.statusbarWin['projection'].SetToolTip(wx.ToolTip (_("Reproject coordinates displayed "
                                                                 "in the statusbar. Projection can be "
                                                                 "defined in GUI preferences dialog "
                                                                 "(tab 'Display')")))
        self.statusbarWin['projection'].Hide()
        
        # mask
        self.statusbarWin['mask'] = wx.StaticText(parent = self.statusbar, id = wx.ID_ANY,
                                                  label = '')
        self.statusbarWin['mask'].SetForegroundColour(wx.Colour(255, 0, 0))
        
        # on-render gauge
        self.statusbarWin['progress'] = wx.Gauge(parent = self.statusbar, id = wx.ID_ANY,
                                      range = 0, style = wx.GA_HORIZONTAL)
        self.statusbarWin['progress'].Hide()
        
        self.StatusbarReposition() # reposition statusbar

        #
        # Init map display (buffered DC & set default cursor)
        #
        self.MapWindow2D = BufferedWindow(self, id = wx.ID_ANY,
                                          Map = self.Map, tree = self.tree, lmgr = self._layerManager)
        # default is 2D display mode
        self.MapWindow = self.MapWindow2D
        self.MapWindow.SetCursor(self.cursors["default"])
        # used by vector digitizer
        self.MapWindowVDigit = None
        # used by Nviz (3D display mode)
        self.MapWindow3D = None 

        #
        # initialize region values
        #
        self._initDisplay() 

        #
        # Bind various events
        #
        self.Bind(wx.EVT_ACTIVATE, self.OnFocus)
        self.Bind(wx.EVT_CLOSE,    self.OnCloseWindow)
        self.Bind(render.EVT_UPDATE_PRGBAR, self.OnUpdateProgress)
        
        #
        # Update fancy gui style
        #
        self._mgr.AddPane(self.MapWindow, wx.aui.AuiPaneInfo().CentrePane().
                          Dockable(False).BestSize((-1,-1)).
                          CloseButton(False).DestroyOnClose(True).
                          Layer(0))
        self._mgr.Update()

        #
        # Init print module and classes
        #
        self.printopt = disp_print.PrintOptions(self, self.MapWindow)
        
        #
        # Init zoom history
        #
        self.MapWindow.ZoomHistory(self.Map.region['n'],
                                   self.Map.region['s'],
                                   self.Map.region['e'],
                                   self.Map.region['w'])

        #
        # Re-use dialogs
        #
        self.dialogs = {}
        self.dialogs['attributes'] = None
        self.dialogs['category'] = None
        self.dialogs['barscale'] = None
        self.dialogs['legend'] = None

        self.decorationDialog = None # decoration/overlays

    def _addToolbarVDigit(self):
        """!Add vector digitizer toolbar
        """
        from vdigit import haveVDigit
        
        if not haveVDigit:
            from vdigit import errorMsg
            msg = _("Unable to start wxGUI vector digitizer.\nDo you want to start "
                    "TCL/TK digitizer (v.digit) instead?\n\n"
                    "Details: %s" % errorMsg)
            
            self.toolbars['map'].combo.SetValue(_("2D view"))
            dlg = wx.MessageDialog(parent = self,
                                   message = msg,
                                   caption=_("Vector digitizer failed"),
                                   style = wx.YES_NO | wx.CENTRE)
            if dlg.ShowModal() == wx.ID_YES:
                mapName = self.tree.GetPyData(self.tree.layer_selected)[0]['maplayer'].GetName()
                self._layerManager.goutput.RunCmd(['v.digit', 'map=%s' % mapName],
                                                  switchPage = False)
            dlg.Destroy()
            
            self.toolbars['map'].combo.SetValue(_("2D view"))
            return
        
        if self._layerManager:
            log = self._layerManager.goutput
        else:
            log = None
        
        if not self.MapWindowVDigit:
            from mapdisp_vdigit import VDigitWindow
            self.MapWindowVDigit = VDigitWindow(self, id = wx.ID_ANY,
                                                Map = self.Map, tree = self.tree,
                                                lmgr = self._layerManager)
            self.MapWindowVDigit.Show()
        
        self.MapWindow = self.MapWindowVDigit
        
        self._mgr.DetachPane(self.MapWindow2D)
        self.MapWindow2D.Hide()
        
        self.toolbars['vdigit'] = toolbars.VDigitToolbar(parent = self, mapcontent = self.Map,
                                                         layerTree = self.tree,
                                                         log = log)
        self.MapWindowVDigit.SetToolbar(self.toolbars['vdigit'])
        
        self._mgr.AddPane(self.MapWindowVDigit, wx.aui.AuiPaneInfo().CentrePane().
                          Dockable(False).BestSize((-1,-1)).
                          CloseButton(False).DestroyOnClose(True).
                          Layer(0))
        self._mgr.AddPane(self.toolbars['vdigit'],
                          wx.aui.AuiPaneInfo().
                          Name("vdigittoolbar").Caption(_("Vector Digitizer Toolbar")).
                          ToolbarPane().Top().Row(1).
                          LeftDockable(False).RightDockable(False).
                          BottomDockable(False).TopDockable(True).
                          CloseButton(False).Layer(2).
                          BestSize((self.toolbars['vdigit'].GetBestSize())))
        # change mouse to draw digitized line
        self.MapWindow.mouse['box'] = "point"
        self.MapWindow.zoomtype     = 0
        self.MapWindow.pen          = wx.Pen(colour = 'red',   width = 2, style = wx.SOLID)
        self.MapWindow.polypen      = wx.Pen(colour = 'green', width = 2, style = wx.SOLID)

    def _addToolbarNviz(self):
        """!Add 3D view mode toolbar
        """
        import nviz
        Debug.msg(5, "MapFrame._addToolbarNviz(): begin")
        # check for GLCanvas and OpenGL
        if not nviz.haveNviz:
            self.toolbars['map'].combo.SetValue(_("2D view"))
            wx.MessageBox(parent = self,
                          message = _("Unable to switch to 3D display mode.\nThe Nviz python extension "
                                      "was not found or loaded properly.\n"
                                      "Switching back to 2D display mode.\n\nDetails: %s" % nviz.errorMsg),
                          caption = _("Error"),
                          style = wx.OK | wx.ICON_ERROR | wx.CENTRE)
            return
        
        # add Nviz toolbar and disable 2D display mode tools
        self.toolbars['nviz'] = toolbars.NvizToolbar(self, self.Map)
        # disable 3D mode for other displays
        for page in range(0, self._layerManager.gm_cb.GetPageCount()):
            if self._layerManager.gm_cb.GetPage(page) != self._layerManager.curr_page:
                if '3D' in self._layerManager.gm_cb.GetPage(page).maptree.mapdisplay.toolbars['map'].combo.GetString(1):
                    self._layerManager.gm_cb.GetPage(page).maptree.mapdisplay.toolbars['map'].combo.Delete(1)
        self.toolbars['map'].Enable2D(False)
        
        # update status bar
        self.statusbarWin['toggle'].Enable(False)
        
        # erase map window
        self.MapWindow.EraseMap()
        
        self._layerManager.goutput.WriteCmdLog(_("Starting 3D view mode..."))
        self.statusbar.SetStatusText(_("Please wait, loading data..."), 0)
        
        # create GL window & NVIZ toolbar
        if not self.MapWindow3D:
            Debug.msg(5, "MapFrame._addToolbarNviz(): GLWindow will be created")
            self.MapWindow3D = nviz.GLWindow(self, id = wx.ID_ANY,
                                             Map = self.Map, tree = self.tree, lmgr = self._layerManager)
            self.MapWindow = self.MapWindow3D
            self.MapWindow.SetCursor(self.cursors["default"])
            
                # add Nviz notebookpage
            self._layerManager.AddNviz()
            
            self.MapWindow3D.OnPaint(None) # -> LoadData
            self.MapWindow3D.Show()
            self.MapWindow3D.UpdateView(None)
        else:
            self.MapWindow = self.MapWindow3D
            # add Nviz notebookpage
            self._layerManager.AddNviz()
            for page in ('view', 'light', 'fringe', 'constant', 'cplane'):
                self._layerManager.nviz.UpdatePage(page)

        
        # switch from MapWindow to MapWindowGL
        # add nviz toolbar
        self._mgr.DetachPane(self.MapWindow2D)
        self.MapWindow2D.Hide()
        self._mgr.AddPane(self.MapWindow3D, wx.aui.AuiPaneInfo().CentrePane().
                          Dockable(False).BestSize((-1,-1)).
                          CloseButton(False).DestroyOnClose(True).
                          Layer(0))
        self._mgr.AddPane(self.toolbars['nviz'],
                          wx.aui.AuiPaneInfo().
                          Name("nviztoolbar").Caption(_("3D View Toolbar")).
                          ToolbarPane().Top().Row(1).
                          LeftDockable(False).RightDockable(False).
                          BottomDockable(False).TopDockable(True).
                          CloseButton(False).Layer(2).
                          BestSize((self.toolbars['nviz'].GetBestSize())))
        
        self.SetStatusText("", 0)
        Debug.msg(5, "MapFrame._addToolbarNviz(): end")

    def AddToolbar(self, name):
        """!Add defined toolbar to the window
        
        Currently known toolbars are:
         - 'map'     - basic map toolbar
         - 'vdigit'  - vector digitizer
         - 'gcpdisp' - GCP Manager Display
         - 'georect' - georectifier
         - 'nviz'    - 3D view mode
        """
        # default toolbar
        if name == "map":
            self.toolbars['map'] = toolbars.MapToolbar(self, self.Map)
            
            self._mgr.AddPane(self.toolbars['map'],
                              wx.aui.AuiPaneInfo().
                              Name("maptoolbar").Caption(_("Map Toolbar")).
                              ToolbarPane().Top().
                              LeftDockable(False).RightDockable(False).
                              BottomDockable(False).TopDockable(True).
                              CloseButton(False).Layer(2).
                              BestSize((self.toolbars['map'].GetBestSize())))
            
        # vector digitizer
        elif name == "vdigit":
            self._addToolbarVDigit()
        
        # georectifier
        elif name == "georect":
            self.toolbars['georect'] = toolbars.GRToolbar(self, self.Map)
            
            self._mgr.AddPane(self.toolbars['georect'],
                              wx.aui.AuiPaneInfo().
                              Name("georecttoolbar").Caption(_("Georectification Toolbar")).
                              ToolbarPane().Top().
                              LeftDockable(False).RightDockable(False).
                              BottomDockable(False).TopDockable(True).
                              CloseButton(False).Layer(2).
                              BestSize((self.toolbars['georect'].GetBestSize())))
        
        # nviz
        elif name == "nviz":
            self._addToolbarNviz()
        
        self._mgr.Update()
        
    def RemoveToolbar (self, name):
        """!Removes defined toolbar from the window

        @todo Only hide, activate by calling AddToolbar()
        """
        # cannot hide main toolbar
        if name == "map":
            return
        
        self._mgr.DetachPane(self.toolbars[name])
        self.toolbars[name].Destroy()
        self.toolbars[name] = None
        
        if name == 'vdigit':
            self._mgr.DetachPane(self.MapWindowVDigit)
            self.MapWindowVDigit.Hide()
            self.MapWindow2D.Show()
            self._mgr.AddPane(self.MapWindow2D, wx.aui.AuiPaneInfo().CentrePane().
                              Dockable(False).BestSize((-1,-1)).
                              CloseButton(False).DestroyOnClose(True).
                              Layer(0))
            self.MapWindow = self.MapWindow2D
        
        elif name == 'nviz':
            # unload data
            # self.MapWindow3D.Reset()
            # switch from MapWindowGL to MapWindow
            self._mgr.DetachPane(self.MapWindow3D)
            self.MapWindow3D.Hide()
            self.MapWindow2D.Show()
            self._mgr.AddPane(self.MapWindow2D, wx.aui.AuiPaneInfo().CentrePane().
                              Dockable(False).BestSize((-1,-1)).
                              CloseButton(False).DestroyOnClose(True).
                              Layer(0))
            self.MapWindow = self.MapWindow2D
            # remove nviz notebook page
            self._layerManager.RemoveNviz()
            
            self.MapWindow.UpdateMap()
        
        self.toolbars['map'].combo.SetValue(_("2D view"))
        self.toolbars['map'].Enable2D(True)
        self.statusbarWin['toggle'].Enable(True)
        
        self._mgr.Update()

    def _initDisplay(self):
        """!Initialize map display, set dimensions and map region
        """
        if not grass.find_program('g.region', ['--help']):
            sys.exit(_("GRASS module '%s' not found. Unable to start map "
                       "display window.") % 'g.region')
        
        self.width, self.height = self.GetClientSize()
        
        Debug.msg(2, "MapFrame._initDisplay():")
        self.Map.ChangeMapSize(self.GetClientSize())
        self.Map.region = self.Map.GetRegion() # g.region -upgc
        # self.Map.SetRegion() # adjust region to match display window
        
    def OnUpdateProgress(self, event):
        """!Update progress bar info
        """
        self.statusbarWin['progress'].SetValue(event.value)
        
        event.Skip()
        
    def OnFocus(self, event):
        """
        Change choicebook page to match display.
        Or set display for georectifying
        """
        if self._layerManager and \
                self._layerManager.georectifying:
            # in georectifying session; display used to get geographic
            # coordinates for GCPs
            self.OnPointer(event)
        else:
            # change bookcontrol page to page associated with display
            if self.page:
                pgnum = self.layerbook.GetPageIndex(self.page)
                if pgnum > -1:
                    self.layerbook.SetSelection(pgnum)
                    self._layerManager.curr_page = self.layerbook.GetCurrentPage()
                    self.layerbook
        
        event.Skip()
        
    def OnDraw(self, event):
        """!Re-display current map composition
        """
        self.MapWindow.UpdateMap(render = False)
        
    def OnRender(self, event):
        """!Re-render map composition (each map layer)
        """
        # delete tmp map layers (queries)
        qlayer = self.Map.GetListOfLayers(l_name = globalvar.QUERYLAYER)
        for layer in qlayer:
            self.Map.DeleteLayer(layer)
        
        # delete tmp lines
        if self.MapWindow.mouse["use"] in ("measure",
                                           "profile"):
            self.MapWindow.polycoords = []
            self.MapWindow.ClearLines()
        
        # deselect features in vdigit
        if self.toolbars['vdigit']:
            self.MapWindow.digit.GetDisplay().SetSelected([])
            self.MapWindow.UpdateMap(render = True, renderVector = True)
        else:
            self.MapWindow.UpdateMap(render = True)
        
        # update statusbar
        self.StatusbarUpdate()

    def OnPointer(self, event):
        """!Pointer button clicked
        """
        if self.toolbars['map']:
            if event:
                self.toolbars['map'].OnTool(event)
            self.toolbars['map'].action['desc'] = ''
        
        self.MapWindow.mouse['use'] = "pointer"
        self.MapWindow.mouse['box'] = "point"

        # change the cursor
        if self.toolbars['vdigit']:
            # digitization tool activated
            self.MapWindow.SetCursor(self.cursors["cross"])

            # reset mouse['box'] if needed
            if self.toolbars['vdigit'].GetAction() in ['addLine']:
                if self.toolbars['vdigit'].GetAction('type') in ['point', 'centroid']:
                    self.MapWindow.mouse['box'] = 'point'
                else: # line, boundary
                    self.MapWindow.mouse['box'] = 'line'
            elif self.toolbars['vdigit'].GetAction() in ['addVertex', 'removeVertex', 'splitLine',
                                                         'editLine', 'displayCats', 'displayAttrs',
                                                         'copyCats']:
                self.MapWindow.mouse['box'] = 'point'
            else: # moveLine, deleteLine
                self.MapWindow.mouse['box'] = 'box'
        
        elif self._layerManager and self._layerManager.georectifying:
            self.MapWindow.SetCursor(self.cursors["cross"])
        
        else:
            self.MapWindow.SetCursor(self.cursors["default"])

    def OnZoomIn(self, event):
        """!Zoom in the map.
        Set mouse cursor, zoombox attributes, and zoom direction
        """
        if self.toolbars['map']:
            self.toolbars['map'].OnTool(event)
            self.toolbars['map'].action['desc'] = ''
        
        self.MapWindow.mouse['use'] = "zoom"
        self.MapWindow.mouse['box'] = "box"
        self.MapWindow.zoomtype = 1
        self.MapWindow.pen = wx.Pen(colour = 'Red', width = 2, style = wx.SHORT_DASH)
        
        # change the cursor
        self.MapWindow.SetCursor(self.cursors["cross"])

    def OnZoomOut(self, event):
        """!Zoom out the map.
        Set mouse cursor, zoombox attributes, and zoom direction
        """
        if self.toolbars['map']:
            self.toolbars['map'].OnTool(event)
            self.toolbars['map'].action['desc'] = ''
        
        self.MapWindow.mouse['use'] = "zoom"
        self.MapWindow.mouse['box'] = "box"
        self.MapWindow.zoomtype = -1
        self.MapWindow.pen = wx.Pen(colour = 'Red', width = 2, style = wx.SHORT_DASH)
        
        # change the cursor
        self.MapWindow.SetCursor(self.cursors["cross"])

    def OnZoomBack(self, event):
        """!Zoom last (previously stored position)
        """
        self.MapWindow.ZoomBack()

    def OnPan(self, event):
        """!Panning, set mouse to drag
        """
        if self.toolbars['map']:
            self.toolbars['map'].OnTool(event)
            self.toolbars['map'].action['desc'] = ''
        
        self.MapWindow.mouse['use'] = "pan"
        self.MapWindow.mouse['box'] = "pan"
        self.MapWindow.zoomtype = 0
        
        # change the cursor
        self.MapWindow.SetCursor(self.cursors["hand"])

    def OnErase(self, event):
        """!Erase the canvas
        """
        self.MapWindow.EraseMap()

    def OnZoomRegion(self, event):
        """!Zoom to region
        """
        self.Map.getRegion()
        self.Map.getResolution()
        self.UpdateMap()
        # event.Skip()

    def OnAlignRegion(self, event):
        """!Align region
        """
        if not self.Map.alignRegion:
            self.Map.alignRegion = True
        else:
            self.Map.alignRegion = False
        # event.Skip()

    def OnToggleRender(self, event):
        """!Enable/disable auto-rendering
        """
        if self.statusbarWin['render'].GetValue():
            self.OnRender(None)

    def IsAutoRendered(self):
        """!Check if auto-rendering is enabled"""
        return self.statusbarWin['render'].IsChecked()
    
    def OnToggleShowRegion(self, event):
        """!Show/Hide extent in map canvas
        """
        if self.statusbarWin['region'].GetValue():
            # show extent
            self.MapWindow.regionCoords = []
        else:
            del self.MapWindow.regionCoords

        # redraw map if auto-rendering is enabled
        if self.statusbarWin['render'].GetValue():
            self.OnRender(None)

    def OnToggleResolution(self, event):
        """
        Use resolution of computation region settings
        for redering image instead of display resolution
        """
        # redraw map if auto-rendering is enabled
        if self.statusbarWin['render'].GetValue():
            self.OnRender(None)
        
    def OnToggleStatus(self, event):
        """
        Toggle status text
        """
        self.StatusbarUpdate()

    def OnChangeMapScale(self, event):
        """
        Map scale changed by user
        """
        scale = event.GetString()

        try:
            if scale[:2] != '1:':
                raise ValueError
            value = int(scale[2:])
        except ValueError:
            self.statusbarWin['mapscale'].SetValue('1:%ld' % int(self.mapScaleValue))
            return

        dEW = value * (self.Map.region['cols'] / self.ppm[0])
        dNS = value * (self.Map.region['rows'] / self.ppm[1])
        self.Map.region['n'] = self.Map.region['center_northing'] + dNS / 2.
        self.Map.region['s'] = self.Map.region['center_northing'] - dNS / 2.
        self.Map.region['w'] = self.Map.region['center_easting']  - dEW / 2.
        self.Map.region['e'] = self.Map.region['center_easting']  + dEW / 2.
        
        # add to zoom history
        self.MapWindow.ZoomHistory(self.Map.region['n'], self.Map.region['s'],
                                   self.Map.region['e'], self.Map.region['w'])
        
        # redraw a map
        self.MapWindow.UpdateMap()
        self.statusbarWin['mapscale'].SetFocus()
        
    def OnGoTo(self, event):
        """
        Go to position
        """
        try:
            if self.statusbarWin['projection'].IsChecked():
                if not UserSettings.Get(group = 'projection', key = 'statusbar', subkey = 'proj4'):
                    self.statusbar.SetStatusText(_("Projection not defined (check the settings)"), 0)
                else:
                    # reproject values
                    projIn = UserSettings.Get(group = 'projection',
                                              key = 'statusbar',
                                              subkey = 'proj4')
                    projOut = gcmd.RunCommand('g.proj',
                                              flags = 'jf',
                                              read = True)
                    proj = projIn.split(' ')[0].split('=')[1]
                    if proj in ('ll', 'latlong', 'longlat'):
                        e, n = self.statusbarWin['goto'].GetValue().split(';')
                        e, n = utils.DMS2Deg(e, n)
                        proj, coord1 = utils.ReprojectCoordinates(coord = (e, n),
                                                                  projIn = projIn,
                                                                  projOut = projOut, flags = 'd')
                        e, n = coord1
                    else:
                        e, n = map(float, self.statusbarWin['goto'].GetValue().split(';'))
                        proj, coord1 = utils.ReprojectCoordinates(coord = (e, n),
                                                                  projIn = projIn,
                                                                  projOut = projOut, flags = 'd')
                        e, n = coord1
            else:
                if self.Map.projinfo['proj'] == 'll':
                    e, n = self.statusbarWin['goto'].GetValue().split(';')
                else:
                    e, n = map(float, self.statusbarWin['goto'].GetValue().split(';'))
                    
            region = self.Map.GetCurrentRegion()
            if self.statusbarWin['projection'].IsChecked():
                if not UserSettings.Get(group = 'projection', key = 'statusbar', subkey = 'proj4'):
                    self.statusbar.SetStatusText(_("Projection not defined (check the settings)"), 0)
                else:
                    region['center_easting'], region['center_northing'] = e, n
            else:
                if self.Map.projinfo['proj'] == 'll':
                    region['center_easting'], region['center_northing'] = utils.DMS2Deg(e, n)
                else:
                    region['center_easting'], region['center_northing'] = e, n
        except ValueError:
            region = self.Map.GetCurrentRegion()
            precision = int(UserSettings.Get(group = 'projection', key = 'format',
                                             subkey = 'precision'))
            format = UserSettings.Get(group = 'projection', key = 'format',
                                      subkey = 'll')
            if self.Map.projinfo['proj'] == 'll' and format == 'DMS':
                    self.statusbarWin['goto'].SetValue("%s" % utils.Deg2DMS(region['center_easting'], 
                                                                            region['center_northing'],
                                                                            precision = precision))
            else:
                self.statusbarWin['goto'].SetValue("%.*f; %.*f" % \
                                                       (precision, region['center_easting'],
                                                        precision, region['center_northing']))
            return
        
        
        dn = (region['nsres'] * region['rows']) / 2.
        region['n'] = region['center_northing'] + dn
        region['s'] = region['center_northing'] - dn
        de = (region['ewres'] * region['cols']) / 2.
        region['e'] = region['center_easting'] + de
        region['w'] = region['center_easting'] - de
        
        self.Map.AdjustRegion()

        # add to zoom history
        self.MapWindow.ZoomHistory(region['n'], region['s'],
                                   region['e'], region['w'])
        
        # redraw a map
        self.MapWindow.UpdateMap()
        self.statusbarWin['goto'].SetFocus()
        
    def StatusbarUpdate(self):
        """!Update statusbar content"""

        self.statusbarWin['region'].Hide()
        self.statusbarWin['resolution'].Hide()
        self.statusbarWin['mapscale'].Hide()
        self.statusbarWin['goto'].Hide()
        self.statusbarWin['projection'].Hide()
        self.mapScaleValue = self.ppm = None

        if self.statusbarWin['toggle'].GetSelection() == 0: # Coordinates
            self.statusbar.SetStatusText("", 0)
            # enable long help
            self.StatusbarEnableLongHelp()

        elif self.statusbarWin['toggle'].GetSelection() in (1, 2): # Extent
            sel = self.statusbarWin['toggle'].GetSelection()
            if sel == 1:
                region = self.Map.region
            else:
                region = self.Map.GetRegion() # computation region

            precision = int(UserSettings.Get(group = 'projection', key = 'format',
                                             subkey = 'precision'))
            format = UserSettings.Get(group = 'projection', key = 'format',
                                      subkey = 'll')
            
            if self.statusbarWin['projection'].IsChecked():
                if not UserSettings.Get(group = 'projection', key = 'statusbar', subkey = 'proj4'):
                    self.statusbar.SetStatusText(_("Projection not defined (check the settings)"), 0)
                else:
                    projOut = UserSettings.Get(group = 'projection',
                                               key = 'statusbar',
                                               subkey = 'proj4')
                    proj, coord1 = utils.ReprojectCoordinates(coord = (region["w"], region["s"]),
                                                              projOut = projOut, flags = 'd')
                    proj, coord2 = utils.ReprojectCoordinates(coord = (region["e"], region["n"]),
                                                          projOut = projOut, flags = 'd')
                    if sel == 2:
                        proj, coord3 = utils.ReprojectCoordinates(coord = (0.0, 0.0),
                                                                  projOut = projOut, flags = 'd')
                        proj, coord4 = utils.ReprojectCoordinates(coord = (region["ewres"], region["nsres"]),
                                                                  projOut = projOut, flags = 'd')
                    if coord1 and coord2:
                        if proj in ('ll', 'latlong', 'longlat') and format == 'DMS':
                            w, s = utils.Deg2DMS(coord1[0], coord1[1], string = False,
                                                 precision = precision)
                            e, n = utils.Deg2DMS(coord2[0], coord2[1], string = False,
                                                 precision = precision)
                            if sel == 1:
                                self.statusbar.SetStatusText("%s - %s, %s - %s" %
                                                             (w, e, s, n), 0)
                            else:
                                ewres, nsres = utils.Deg2DMS(abs(coord3[0]) - abs(coord4[0]),
                                                             abs(coord3[1]) - abs(coord4[1]),
                                                             string = False, hemisphere = False,
                                                             precision = precision)
                                self.statusbar.SetStatusText("%s - %s, %s - %s (%s, %s)" %
                                                             (w, e, s, n, ewres, nsres), 0)
                        else:
                            w, s = coord1
                            e, n = coord2
                            if sel == 1:
                                self.statusbar.SetStatusText("%.*f - %.*f, %.*f - %.*f" %
                                                         (precision, w, precision, e,
                                                          precision, s, precision, n), 0)
                            else:
                                ewres, nsres = coord3
                                self.statusbar.SetStatusText("%.*f - %.*f, %.*f - %.*f (%.*f, %.*f)" %
                                                             (precision, w, precision, e,
                                                              precision, s, precision, n,
                                                              precision, ewres, precision, nsres), 0)
                    else:
                        self.statusbar.SetStatusText(_("Error in projection (check the settings)"), 0)
            else:
                if self.Map.projinfo['proj'] == 'll' and format == 'DMS':
                    w, s = utils.Deg2DMS(region["w"], region["s"],
                                         string = False, precision = precision)
                    e, n = utils.Deg2DMS(region["e"], region["n"],
                                         string = False, precision = precision)
                    if sel == 1:
                        self.statusbar.SetStatusText("%s - %s, %s - %s" %
                                                     (w, e, s, n), 0)
                    else:
                        ewres, nsres = utils.Deg2DMS(region['ewres'], region['nsres'],
                                                     string = False, precision = precision)
                        self.statusbar.SetStatusText("%s - %s, %s - %s (%s, %s)" %
                                                     (w, e, s, n, ewres, nsres), 0)
                else:
                    w, s = region["w"], region["s"]
                    e, n = region["e"], region["n"]
                    if sel == 1:
                        self.statusbar.SetStatusText("%.*f - %.*f, %.*f - %.*f" %
                                                     (precision, w, precision, e,
                                                      precision, s, precision, n), 0)
                    else:
                        ewres, nsres = region['ewres'], region['nsres']
                        self.statusbar.SetStatusText("%.*f - %.*f, %.*f - %.*f (%.*f, %.*f)" %
                                                     (precision, w, precision, e,
                                                      precision, s, precision, n,
                                                      precision, ewres, precision, nsres), 0)
            # enable long help
            self.StatusbarEnableLongHelp()

        elif self.statusbarWin['toggle'].GetSelection() == 3: # Show comp. extent
            self.statusbar.SetStatusText("", 0)
            self.statusbarWin['region'].Show()
            # disable long help
            self.StatusbarEnableLongHelp(False)

        elif self.statusbarWin['toggle'].GetSelection() == 4: # Display mode
            self.statusbar.SetStatusText("", 0)
            self.statusbarWin['resolution'].Show()
            # disable long help
            self.StatusbarEnableLongHelp(False)

        elif self.statusbarWin['toggle'].GetSelection() == 5: # Display geometry
            self.statusbar.SetStatusText("rows=%d; cols=%d; nsres=%.2f; ewres=%.2f" %
                                         (self.Map.region["rows"], self.Map.region["cols"],
                                          self.Map.region["nsres"], self.Map.region["ewres"]), 0)
            # enable long help
            self.StatusbarEnableLongHelp()

        elif self.statusbarWin['toggle'].GetSelection() == 6: # Map scale
            # TODO: need to be fixed...
            ### screen X region problem
            ### user should specify ppm
            dc = wx.ScreenDC()
            dpSizePx = wx.DisplaySize()   # display size in pixels
            dpSizeMM = wx.DisplaySizeMM() # display size in mm (system)
            dpSizeIn = (dpSizeMM[0] / 25.4, dpSizeMM[1] / 25.4) # inches
            sysPpi  = dc.GetPPI()
            comPpi = (dpSizePx[0] / dpSizeIn[0],
                      dpSizePx[1] / dpSizeIn[1])

            ppi = comPpi                  # pixel per inch
            self.ppm = ((ppi[0] / 2.54) * 100, # pixel per meter
                        (ppi[1] / 2.54) * 100)

            Debug.msg(4, "MapFrame.StatusbarUpdate(mapscale): size: px=%d,%d mm=%f,%f "
                      "in=%f,%f ppi: sys=%d,%d com=%d,%d; ppm=%f,%f" % \
                          (dpSizePx[0], dpSizePx[1], dpSizeMM[0], dpSizeMM[1],
                           dpSizeIn[0], dpSizeIn[1],
                           sysPpi[0], sysPpi[1], comPpi[0], comPpi[1],
                           self.ppm[0], self.ppm[1]))

            region = self.Map.region

            heightCm = region['rows'] / self.ppm[1] * 100
            widthCm  = region['cols'] / self.ppm[0] * 100

            Debug.msg(4, "MapFrame.StatusbarUpdate(mapscale): width_cm=%f, height_cm=%f" %
                      (widthCm, heightCm))

            xscale = (region['e'] - region['w']) / (region['cols'] / self.ppm[0])
            yscale = (region['n'] - region['s']) / (region['rows'] / self.ppm[1])
            scale = (xscale + yscale) / 2.
            
            Debug.msg(3, "MapFrame.StatusbarUpdate(mapscale): xscale=%f, yscale=%f -> scale=%f" % \
                          (xscale, yscale, scale))

            self.statusbar.SetStatusText("")
            try:
                self.statusbarWin['mapscale'].SetValue("1:%ld" % (scale + 0.5))
            except TypeError:
                pass
            self.mapScaleValue = scale
            self.statusbarWin['mapscale'].Show()

            # disable long help
            self.StatusbarEnableLongHelp(False)

        elif self.statusbarWin['toggle'].GetSelection() == 7: # go to
            self.statusbar.SetStatusText("")
            region = self.Map.GetCurrentRegion()
            precision = int(UserSettings.Get(group = 'projection', key = 'format',
                                             subkey = 'precision'))
            format = UserSettings.Get(group = 'projection', key = 'format',
                                      subkey = 'll')
            
            if self.statusbarWin['projection'].IsChecked():
                if not UserSettings.Get(group='projection', key='statusbar', subkey='proj4'):
                    self.statusbar.SetStatusText(_("Projection not defined (check the settings)"), 0)
                else:
                    proj, coord  = utils.ReprojectCoordinates(coord = (region['center_easting'],
                                                                       region['center_northing']),
                                                              projOut = UserSettings.Get(group = 'projection',
                                                                                         key = 'statusbar',
                                                                                         subkey = 'proj4'),
                                                              flags = 'd')
                    if coord:
                        if proj in ('ll', 'latlong', 'longlat') and format == 'DMS':
                            self.statusbarWin['goto'].SetValue("%s" % utils.Deg2DMS(coord[0],
                                                                                    coord[1],
                                                                                    precision = precision))
                        else:
                            self.statusbarWin['goto'].SetValue("%.*f; %.*f" % (precision, coord[0],
                                                                               precision, coord[1]))
                    else:
                        self.statusbar.SetStatusText(_("Error in projection (check the settings)"), 0)
            else:
                if self.Map.projinfo['proj'] == 'll' and format == 'DMS':
                    self.statusbarWin['goto'].SetValue("%s" % utils.Deg2DMS(region['center_easting'], 
                                                                            region['center_northing'],
                                                                            precision = precision))
                else:
                    self.statusbarWin['goto'].SetValue("%.*f; %.*f" % (precision, region['center_easting'],
                                                                       precision, region['center_northing']))
            self.statusbarWin['goto'].Show()

            # disable long help
            self.StatusbarEnableLongHelp(False)
        
        elif self.statusbarWin['toggle'].GetSelection() == 8: # projection
            self.statusbar.SetStatusText("")
            epsg = UserSettings.Get(group = 'projection', key = 'statusbar', subkey = 'epsg')
            if epsg:
                label = '%s (EPSG: %s)' % (_("Use defined projection"), epsg)
                self.statusbarWin['projection'].SetLabel(label)
            else:
                self.statusbarWin['projection'].SetLabel(_("Use defined projection"))
            self.statusbarWin['projection'].Show()
            
            # disable long help
            self.StatusbarEnableLongHelp(False)
            
        else:
            self.statusbar.SetStatusText("", 1)

    def StatusbarEnableLongHelp(self, enable = True):
        """!Enable/disable toolbars long help"""
        for toolbar in self.toolbars.itervalues():
            if toolbar:
                toolbar.EnableLongHelp(enable)
                
    def StatusbarReposition(self):
        """!Reposition checkbox in statusbar"""
        # reposition checkbox
        widgets = [(0, self.statusbarWin['region']),
                   (0, self.statusbarWin['resolution']),
                   (0, self.statusbarWin['mapscale']),
                   (0, self.statusbarWin['progress']),
                   (0, self.statusbarWin['projection']),
                   (1, self.statusbarWin['toggle']),
                   (2, self.statusbarWin['mask']),
                   (3, self.statusbarWin['render'])]
        for idx, win in widgets:
            rect = self.statusbar.GetFieldRect(idx)
            if idx == 0: # show region / mapscale / process bar
                # -> size
                wWin, hWin = win.GetBestSize()
                if win == self.statusbarWin['progress']:
                    wWin = rect.width - 6
                # -> position
                # if win == self.statusbarWin['region']:
                # x, y = rect.x + rect.width - wWin, rect.y - 1
                # align left
                # else:
                x, y = rect.x + 3, rect.y - 1
                w, h = wWin, rect.height + 2
            else: # choice || auto-rendering
                x, y = rect.x, rect.y - 1
                w, h = rect.width, rect.height + 2
                if idx == 2: # mask
                    x += 5
                    y += 4
                elif idx == 3: # render
                    x += 5
            win.SetPosition((x, y))
            win.SetSize((w, h))

    def SaveToFile(self, event):
        """!Save map to image
        """
        if self.toolbars['nviz']:
            filetype = "PPM file (*.ppm)|*.ppm|TIF file (*.tif)|*.tif"
            ltype = [{ 'ext' : 'ppm', 'type' : -1 },
                     { 'ext' : 'tif', 'type' : wx.BITMAP_TYPE_TIF }]
        else:
            img = self.MapWindow.img
            if not img:
                gcmd.GMessage(parent = self,
                              message = _("Nothing to render (empty map). Operation canceled."))
                return
            filetype, ltype = gdialogs.GetImageHandlers(img)
        
        # get size
        dlg = gdialogs.ImageSizeDialog(self)
        dlg.CentreOnParent()
        if dlg.ShowModal() != wx.ID_OK:
            dlg.Destroy()
            return
        width, height = dlg.GetValues()
        dlg.Destroy()
        
        # get filename
        dlg = wx.FileDialog(parent = self,
                            message = _("Choose a file name to save the image "
                                        "(no need to add extension)"),
                            wildcard = filetype,
                            style = wx.SAVE | wx.FD_OVERWRITE_PROMPT)
        
        if dlg.ShowModal() == wx.ID_OK:
            path = dlg.GetPath()
            if not path:
                dlg.Destroy()
                return
            
            base, ext = os.path.splitext(path)
            fileType = ltype[dlg.GetFilterIndex()]['type']
            extType  = ltype[dlg.GetFilterIndex()]['ext']
            if ext != extType:
                path = base + '.' + extType
            
            self.MapWindow.SaveToFile(path, fileType,
                                      width, height)
            
        dlg.Destroy()

    def PrintMenu(self, event):
        """
        Print options and output menu for map display
        """
        point = wx.GetMousePosition()
        printmenu = wx.Menu()
        # Add items to the menu
        setup = wx.MenuItem(printmenu, wx.ID_ANY, _('Page setup'))
        printmenu.AppendItem(setup)
        self.Bind(wx.EVT_MENU, self.printopt.OnPageSetup, setup)

        preview = wx.MenuItem(printmenu, wx.ID_ANY, _('Print preview'))
        printmenu.AppendItem(preview)
        self.Bind(wx.EVT_MENU, self.printopt.OnPrintPreview, preview)

        doprint = wx.MenuItem(printmenu, wx.ID_ANY, _('Print display'))
        printmenu.AppendItem(doprint)
        self.Bind(wx.EVT_MENU, self.printopt.OnDoPrint, doprint)

        # Popup the menu.  If an item is selected then its handler
        # will be called before PopupMenu returns.
        self.PopupMenu(printmenu)
        printmenu.Destroy()

    def OnCloseWindow(self, event):
        """!Window closed.
        Also close associated layer tree page
        """
        pgnum = None
        self.Map.Clean()
        
        # close edited map and 3D tools properly
        if self.toolbars['vdigit']:
            maplayer = self.toolbars['vdigit'].GetLayer()
            if maplayer:
                self.toolbars['vdigit'].OnExit()
        
        if self.toolbars['nviz']:
            self.toolbars['nviz'].OnExit()
        
        if not self._layerManager:
            self.Destroy()
        elif self.page:
            pgnum = self.layerbook.GetPageIndex(self.page)
            if pgnum > -1:
                self.layerbook.DeletePage(pgnum)
        
    def GetRender(self):
        """!Returns current instance of render.Map()
        """
        return self.Map

    def GetWindow(self):
        """!Get map window"""
        return self.MapWindow

    def _OnQuery(self):
        """!Internal method used by OnQuery*() methods"""
        if self.toolbars['map'].GetAction() == 'displayAttrb':
            # switch to output console to show query results
            self._layerManager.notebook.SetSelectionByName('output')
        
        self.MapWindow.mouse['box'] = "point"
        self.MapWindow.zoomtype = 0
        
        # change the cursor
        self.MapWindow.SetCursor(self.cursors["cross"])
        
    def OnQueryDisplay(self, event):
        """!Query currrent raster/vector map layers (display mode) -
        2D view mode
        """
        if self.toolbars['map'].GetAction() == 'displayAttrb': # select previous action
            self.toolbars['map'].SelectDefault(event)
            return
        
        self.toolbars['map'].action['desc'] = 'displayAttrb'
        
        self.MapWindow.mouse['use'] = "query"
        self._OnQuery()
        
    def OnQueryModify(self, event):
        """!Query vector map layer (edit mode) - 2D view mode
        """
        if self.toolbars['map'].GetAction() == 'modifyAttrb': # select previous action
            self.toolbars['map'].SelectDefault(event)
            return
        
        self.toolbars['map'].action['desc'] = 'modifyAttrb'
        
        self.MapWindow.mouse['use'] = "queryVector"
        self.MapWindow.pen = wx.Pen(colour = 'Red', width = 2, style = wx.SHORT_DASH)
        self._OnQuery()
        
    def OnNvizQuerySurface(self, event):
        """!Query current surface in 3D view mode"""
        if self.toolbars['map'].GetAction() == 'nvizQuerySurface':
            self.toolbars['map'].SelectDefault(event)
            return
        
        self.toolbars['map'].action['desc'] = 'nvizQuerySurface'
        
        self.MapWindow.mouse['use'] = "nvizQuerySurface"
        self._OnQuery()

    def OnNvizQueryVector(self, event):
        """!Query current vector in 3D view mode"""
        if self.toolbars['map'].GetAction() == 'nvizQueryVector':
            self.toolbars['map'].SelectDefault(event)
            return
        
        self.toolbars['map'].action['desc'] = 'nvizQueryVector'
        
        self.MapWindow.mouse['use'] = "nvizQueryVector"
        self._OnQuery()
        
    def QueryMap(self, x, y):
        """!Query map layer features
        
        Currently only raster and vector map layers are supported.
        
        @param x,y coordinates
        """
        #set query snap distance for v.what at mapunit equivalent of 10 pixels
        qdist = 10.0 * ((self.Map.region['e'] - self.Map.region['w']) / self.Map.width)
        east, north = self.MapWindow.Pixel2Cell((x, y))
        
        num = 0
        for layer in self.tree.GetSelections():
            type = self.tree.GetPyData(layer)[0]['maplayer'].GetType()
            if type in ('raster', 'rgb', 'his',
                        'vector', 'thememap', 'themechart'):
                num += 1
        
        if num < 1:
            dlg = wx.MessageDialog(parent = self,
                                   message = _('No raster or vector map layer selected for querying.'),
                                   caption = _('No map layer selected'),
                                   style = wx.OK | wx.ICON_INFORMATION | wx.CENTRE)
            dlg.ShowModal()
            dlg.Destroy()
            return
        
        mapname = None
        raststr = ''
        vectstr = ''
        rcmd = ['r.what', '--v']
        vcmd = ['v.what', '--v']
        for layer in self.tree.GetSelections():
            type = self.tree.GetPyData(layer)[0]['maplayer'].GetType()
            dcmd = self.tree.GetPyData(layer)[0]['cmd']
            name, found = utils.GetLayerNameFromCmd(dcmd)
            if not found:
                continue
            if type in ('raster', 'rgb', 'his'):
                raststr += "%s," % name
            elif type in ('vector', 'thememap', 'themechart'):
                vectstr += "%s," % name
        
        # use display region settings instead of computation region settings
        self.tmpreg = os.getenv("GRASS_REGION")
        os.environ["GRASS_REGION"] = self.Map.SetRegion(windres = False)
        
        # build query commands for any selected rasters and vectors
        if raststr != '':
            rcmd.append('-f')
            rcmd.append('input=%s' % raststr.rstrip(','))
            rcmd.append('east_north=%f,%f' % (float(east), float(north)))
        
        if vectstr != '':
            # check for vector maps open to be edited
            digitToolbar = self.toolbars['vdigit']
            if digitToolbar:
                map = digitToolbar.GetLayer().GetName()
                vect = []
                for vector in vectstr.split(','):
                    if map == vector:
                        self._layerManager.goutput.WriteWarning("Vector map <%s> "
                                                                "opened for editing - skipped." % map)
                        continue
                    vect.append(vector)
                vectstr = ','.join(vect)
            
            if len(vectstr) <= 1:
                self._layerManager.goutput.WriteCmdLog("Nothing to query.")
                return
            
            vcmd.append('-a')
            vcmd.append('map=%s' % vectstr.rstrip(','))
            vcmd.append('east_north=%f,%f' % (float(east), float(north)))
            vcmd.append('distance=%f' % float(qdist))
        
        # parse query command(s)
        if self._layerManager:
            if raststr:
                self._layerManager.goutput.RunCmd(rcmd,
                                                  compReg = False,
                                                  onDone  =  self._QueryMapDone)
            if vectstr:
                self._layerManager.goutput.RunCmd(vcmd,
                                                  onDone = self._QueryMapDone)
        else:
            if raststr:
                gcmd.RunCommand(rcmd)
            if vectstr:
                gcmd.RunCommand(vcmd)
        
    def _QueryMapDone(self, cmd, returncode):
        """!Restore settings after querying (restore GRASS_REGION)
        
        @param returncode command return code
        """
        if hasattr(self, "tmpreg"):
            if self.tmpreg:
                os.environ["GRASS_REGION"] = self.tmpreg
            elif 'GRASS_REGION' in os.environ:
                del os.environ["GRASS_REGION"]
        elif 'GRASS_REGION' in os.environ:
            del os.environ["GRASS_REGION"]
        
        if hasattr(self, "tmpreg"):
            del self.tmpreg
        
    def QueryVector(self, x, y):
        """!Query vector map layer features

        Attribute data of selected vector object are displayed in GUI dialog.
        Data can be modified (On Submit)
        """
        if not self.tree.layer_selected or \
                self.tree.GetPyData(self.tree.layer_selected)[0]['type'] != 'vector':
            wx.MessageBox(parent = self,
                          message = _("No vector map selected for querying."),
                          caption = _("Vector querying"),
                          style = wx.OK | wx.ICON_INFORMATION | wx.CENTRE)
            return
        
        if self.tree.GetPyData(self.tree.layer_selected)[0]['maplayer'].GetMapset() != \
                grass.gisenv()['MAPSET']:
            wx.MessageBox(parent = self,
                          message = _("Only vector map from the current mapset can be modified."),
                          caption = _("Vector querying"),
                          style = wx.OK | wx.ICON_INFORMATION | wx.CENTRE)
            return
        
        posWindow = self.ClientToScreen((x + self.MapWindow.dialogOffset,
                                         y + self.MapWindow.dialogOffset))

        qdist = 10.0 * ((self.Map.region['e'] - self.Map.region['w']) /
                        self.Map.width)
        
        east, north = self.MapWindow.Pixel2Cell((x, y))
        
        mapName = self.tree.GetPyData(self.tree.layer_selected)[0]['maplayer'].name
        
        if self.dialogs['attributes'] is None:
            self.dialogs['attributes'] = \
                dbm_dialogs.DisplayAttributesDialog(parent = self.MapWindow,
                                                    map = mapName,
                                                    query = ((east, north), qdist),
                                                    pos = posWindow,
                                                    action = "update")
        else:
            # selection changed?
            if not self.dialogs['attributes'].mapDBInfo or \
                    self.dialogs['attributes'].mapDBInfo.map != mapName:
                self.dialogs['attributes'].UpdateDialog(map = mapName, query = ((east, north), qdist))
            else:
                self.dialogs['attributes'].UpdateDialog(query = ((east, north), qdist))
                
        cats = self.dialogs['attributes'].GetCats()
        
        try:
            qlayer = self.Map.GetListOfLayers(l_name = globalvar.QUERYLAYER)[0]
        except IndexError:
            qlayer = None
        
        if self.dialogs['attributes'].mapDBInfo and cats:
            # highlight feature & re-draw map
            if qlayer:
                qlayer.SetCmd(self.AddTmpVectorMapLayer(mapName, cats,
                                                        useId = False,
                                                        addLayer = False))
            else:
                qlayer = self.AddTmpVectorMapLayer(mapName, cats, useId = False)
            
            # set opacity based on queried layer
            opacity = self.tree.GetPyData(self.tree.layer_selected)[0]['maplayer'].GetOpacity(float = True)
            qlayer.SetOpacity(opacity)
            
            self.MapWindow.UpdateMap(render = False, renderVector = False)
            if not self.dialogs['attributes'].IsShown():
                self.dialogs['attributes'].Show()
        else:
            if qlayer:
                self.Map.DeleteLayer(qlayer)
                self.MapWindow.UpdateMap(render = False, renderVector = False)
            if self.dialogs['attributes'].IsShown():
                self.dialogs['attributes'].Hide()
        
    def OnQuery(self, event):
        """!Query tools menu"""
        if self.toolbars['map']:
            self.toolbars['map'].OnTool(event)
            action = self.toolbars['map'].GetAction()
        
        point = wx.GetMousePosition()
        toolsmenu = wx.Menu()

        # add items to the menu
        if self.toolbars['nviz']:
            raster = wx.MenuItem(parentMenu = toolsmenu, id = wx.ID_ANY,
                                 text = _("Query surface (raster map)"),
                                 kind = wx.ITEM_CHECK)
            toolsmenu.AppendItem(raster)
            self.Bind(wx.EVT_MENU, self.OnNvizQuerySurface, raster)
            if action == "nvizQuerySurface":
                raster.Check(True)
            vector = wx.MenuItem(parentMenu = toolsmenu, id = wx.ID_ANY,
                                 text = _("Query vector map"),
                                 kind = wx.ITEM_CHECK)
            toolsmenu.AppendItem(vector)
            self.Bind(wx.EVT_MENU, self.OnNvizQueryVector, vector)
            if action == "nvizQueryVector":
                vector.Check(True)
        else:
            display = wx.MenuItem(parentMenu = toolsmenu, id = wx.ID_ANY,
                                  text = _("Query raster/vector map(s) (display mode)"),
                                  kind = wx.ITEM_CHECK)
            toolsmenu.AppendItem(display)
            self.Bind(wx.EVT_MENU, self.OnQueryDisplay, display)
            numLayers = 0
            for layer in self.tree.GetSelections():
                type = self.tree.GetPyData(layer)[0]['maplayer'].GetType()
                if type in ('raster', 'rgb', 'his',
                            'vector', 'thememap', 'themechart'):
                    numLayers += 1
            if numLayers < 1:
                display.Enable(False)
            if action == "displayAttrb":
                display.Check(True)
            
            modify = wx.MenuItem(parentMenu = toolsmenu, id = wx.ID_ANY,
                                 text = _("Query vector map (edit mode)"),
                                 kind = wx.ITEM_CHECK)
            toolsmenu.AppendItem(modify)
            self.Bind(wx.EVT_MENU, self.OnQueryModify, modify)
            modify.Enable(False)
            if action == "modifyAttrb":
                modify.Check(True)
            
            digitToolbar = self.toolbars['vdigit']
            if self.tree.layer_selected:
                mapLayer = self.tree.GetPyData(self.tree.layer_selected)[0]['maplayer']
                if mapLayer.GetType() == 'vector' and \
                        mapLayer.GetMapset() == grass.gisenv()['MAPSET'] and \
                        (not digitToolbar or (digitToolbar and \
                             digitToolbar.GetLayer() != mapLayer)):
                    modify.Enable(True)
            else:
                if action == "modifyAttrb":
                    modify.Check(True)
        
        self.PopupMenu(toolsmenu)
        toolsmenu.Destroy()

    def AddTmpVectorMapLayer(self, name, cats, useId = False, addLayer = True):
        """!Add temporal vector map layer to map composition

        @param name name of map layer
        @param useId use feature id instead of category 
        """
        # color settings from ATM
        color = UserSettings.Get(group = 'atm', key = 'highlight', subkey = 'color')
        colorStr = str(color[0]) + ":" + \
            str(color[1]) + ":" + \
            str(color[2])

        # icon used in vector display and its size
        icon = ''
        size = 0
        vparam = self.tree.GetPyData(self.tree.layer_selected)[0]['cmd']
        for p in vparam:
            if '=' in p:
                parg,pval = p.split('=')
                if parg == 'icon': icon = pval
                elif parg == 'size': size = int(pval)

        pattern = ["d.vect",
                   "map=%s" % name,
                   "color=%s" % colorStr,
                   "fcolor=%s" % colorStr,
                   "width=%d"  % UserSettings.Get(group = 'atm', key = 'highlight', subkey = 'width')]
        if icon != '':
            pattern.append('icon=%s' % icon)
        if size > 0:
            pattern.append('size=%i' % size)
        
        if useId:
            cmd = pattern
            cmd.append('-i')
            cmd.append('cats=%s' % str(cats))
        else:
            cmd = []
            for layer in cats.keys():
                cmd.append(copy.copy(pattern))
                lcats = cats[layer]
                cmd[-1].append("layer=%d" % layer)
                cmd[-1].append("cats=%s" % utils.ListOfCatsToRange(lcats))
        
        if addLayer:
            if useId:
                return self.Map.AddLayer(type = 'vector', name = globalvar.QUERYLAYER, command = cmd,
                                         l_active = True, l_hidden = True, l_opacity = 1.0)
            else:
                return self.Map.AddLayer(type = 'command', name = globalvar.QUERYLAYER, command = cmd,
                                         l_active = True, l_hidden = True, l_opacity = 1.0)
        else:
            return cmd

    def OnAnalyze(self, event):
        """!Analysis tools menu
        """
        point = wx.GetMousePosition()
        toolsmenu = wx.Menu()
        icons = Icons['displayWindow']
        
        # Add items to the menu
        measure = wx.MenuItem(toolsmenu, wx.ID_ANY, icons["measure"].GetLabel())
        measure.SetBitmap(icons["measure"].GetBitmap(self.iconsize))
        toolsmenu.AppendItem(measure)
        self.Bind(wx.EVT_MENU, self.OnMeasure, measure)
        
        profile = wx.MenuItem(toolsmenu, wx.ID_ANY, icons["profile"].GetLabel())
        profile.SetBitmap(icons["profile"].GetBitmap(self.iconsize))
        toolsmenu.AppendItem(profile)
        self.Bind(wx.EVT_MENU, self.Profile, profile)

        histogram = wx.MenuItem(toolsmenu, wx.ID_ANY, icons["histogram"].GetLabel())
        histogram.SetBitmap(icons["histogram"].GetBitmap(self.iconsize))
        toolsmenu.AppendItem(histogram)
        self.Bind(wx.EVT_MENU, self.Histogram, histogram)

        # Popup the menu.  If an item is selected then its handler
        # will be called before PopupMenu returns.
        self.PopupMenu(toolsmenu)
        toolsmenu.Destroy()

    def OnMeasure(self, event):
        """!Init measurement routine that calculates map distance
        along transect drawn on map display
        """
        self.totaldist = 0.0 # total measured distance
        
        # switch Layer Manager to output console to show measure results
        self._layerManager.notebook.SetSelectionByName('output')
        
        # change mouse to draw line for measurement
        self.MapWindow.mouse['use'] = "measure"
        self.MapWindow.mouse['box'] = "line"
        self.MapWindow.zoomtype = 0
        self.MapWindow.pen     = wx.Pen(colour = 'red', width = 2, style = wx.SHORT_DASH)
        self.MapWindow.polypen = wx.Pen(colour = 'green', width = 2, style = wx.SHORT_DASH)
        
        # change the cursor
        self.MapWindow.SetCursor(self.cursors["pencil"])
        
        # initiating output
        style = self._layerManager.goutput.cmd_output.StyleWarning
        self._layerManager.goutput.WriteLog(_('Click and drag with left mouse button '
                                              'to measure.%s'
                                              'Double click with left button to clear.') % \
                                                (os.linesep), style)
        if self.Map.projinfo['proj'] != 'xy':
            units = self.Map.projinfo['units']
            self._layerManager.goutput.WriteCmdLog(_('Measuring distance') + ' ('
                                                   + units + '):')
        else:
            self._layerManager.goutput.WriteCmdLog(_('Measuring distance:'))
        
        if self.Map.projinfo['proj'] == 'll':
            try:
                import grass.lib.gis as gislib
                global haveCtypes
                haveCtypes = True

                gislib.G_begin_distance_calculations()
            except ImportError, e:
                self._layerManager.goutput.WriteWarning(_('Geodesic distance is not yet '
                                                          'supported by this tool.\n'
                                                          'Reason: %s' % e))
        
    def MeasureDist(self, beginpt, endpt):
        """!Calculate map distance from screen distance
        and print to output window
        """
        self._layerManager.notebook.SetSelectionByName('output')
        
        dist, (north, east) = self.MapWindow.Distance(beginpt, endpt)
        
        dist = round(dist, 3)
        d, dunits = self.FormatDist(dist)
        
        self.totaldist += dist
        td, tdunits = self.FormatDist(self.totaldist)
        
        strdist = str(d)
        strtotdist = str(td)
        
        if self.Map.projinfo['proj'] == 'xy' or 'degree' not in self.Map.projinfo['unit']:
            angle = int(math.degrees(math.atan2(north,east)) + 0.5)
            angle = 180 - angle
            if angle < 0:
                angle = 360 + angle
            
            mstring = '%s = %s %s\n%s = %s %s\n%s = %d %s\n%s' \
                % (_('segment'), strdist, dunits,
                   _('total distance'), strtotdist, tdunits,
                   _('bearing'), angle, _('deg'),
                   '-' * 60)
        else:
            mstring = '%s = %s %s\n%s = %s %s\n%s' \
                % (_('segment'), strdist, dunits,
                   _('total distance'), strtotdist, tdunits,
                   '-' * 60)
        
        self._layerManager.goutput.WriteLog(mstring)
        
        return dist

    def Profile(self, event):
        """!Init profile canvas and tools
        """
        raster = []
        if self.tree.layer_selected and \
                self.tree.GetPyData(self.tree.layer_selected)[0]['type'] == 'raster':
            raster.append(self.tree.GetPyData(self.tree.layer_selected)[0]['maplayer'].name)

        self.profile = profile.ProfileFrame(self,
                                            id = wx.ID_ANY, pos = wx.DefaultPosition, size = (700,300),
                                            style = wx.DEFAULT_FRAME_STYLE, rasterList = raster)
        self.profile.Show()
        # Open raster select dialog to make sure that a raster (and the desired raster)
        # is selected to be profiled
        self.profile.OnSelectRaster(None)

    def FormatDist(self, dist):
        """!Format length numbers and units in a nice way,
        as a function of length. From code by Hamish Bowman
        Grass Development Team 2006"""
        
        mapunits = self.Map.projinfo['units']
        if mapunits == 'metres':
            mapunits = 'meters'
        outunits = mapunits
        dist = float(dist)
        divisor = 1.0
        
        # figure out which units to use
        if mapunits == 'meters':
            if dist > 2500.0:
                outunits = 'km'
                divisor = 1000.0
            else: outunits = 'm'
        elif mapunits == 'feet':
            # nano-bug: we match any "feet", but US Survey feet is really
            #  5279.9894 per statute mile, or 10.6' per 1000 miles. As >1000
            #  miles the tick markers are rounded to the nearest 10th of a
            #  mile (528'), the difference in foot flavours is ignored.
            if dist > 5280.0:
                outunits = 'miles'
                divisor = 5280.0
            else:
                outunits = 'ft'
        elif 'degree' in mapunits and \
                not haveCtypes:
            if dist < 1:
                outunits = 'min'
                divisor = (1/60.0)
            else:
                outunits = 'deg'
        else:
            outunits = 'meters'
        
        # format numbers in a nice way
        if (dist/divisor) >= 2500.0:
            outdist = round(dist/divisor)
        elif (dist/divisor) >= 1000.0:
            outdist = round(dist/divisor,1)
        elif (dist/divisor) > 0.0:
            outdist = round(dist/divisor,int(math.ceil(3-math.log10(dist/divisor))))
        else:
            outdist = float(dist/divisor)
        
        return (outdist, outunits)
    
    def Histogram(self, event):
        """!Init histogram display canvas and tools
        """
        self.histogram = histogram.HistFrame(self,
                                             id = wx.ID_ANY, size = globalvar.HIST_WINDOW_SIZE,
                                             style = wx.DEFAULT_FRAME_STYLE)

        #show new display
        self.histogram.Show()
        self.histogram.Refresh()
        self.histogram.Update()


    def OnDecoration(self, event):
        """!Decorations overlay menu
        """
        point = wx.GetMousePosition()
        decmenu = wx.Menu()
        icons = Icons['displayWindow']
        
        # Add items to the menu
        AddScale = wx.MenuItem(decmenu, wx.ID_ANY, icons["addBarscale"].GetLabel())
        AddScale.SetBitmap(icons["addBarscale"].GetBitmap(self.iconsize))
        decmenu.AppendItem(AddScale)
        self.Bind(wx.EVT_MENU, self.OnAddBarscale, AddScale)
        
        AddLegend = wx.MenuItem(decmenu, wx.ID_ANY, icons["addLegend"].GetLabel())
        AddLegend.SetBitmap(icons["addLegend"].GetBitmap(self.iconsize))
        decmenu.AppendItem(AddLegend)
        self.Bind(wx.EVT_MENU, self.OnAddLegend, AddLegend)
        
        AddText = wx.MenuItem(decmenu, wx.ID_ANY, icons["addText"].GetLabel())
        AddText.SetBitmap(icons["addText"].GetBitmap(self.iconsize))
        decmenu.AppendItem(AddText)
        self.Bind(wx.EVT_MENU, self.OnAddText, AddText)
        
        # Popup the menu.  If an item is selected then its handler
        # will be called before PopupMenu returns.
        self.PopupMenu(decmenu)
        decmenu.Destroy()
        
    def OnAddBarscale(self, event):
        """!Handler for scale/arrow map decoration menu selection.
        """
        if self.dialogs['barscale']:
            return
        
        id = 0 # unique index for overlay layer

        # If location is latlon, only display north arrow (scale won't work)
        #        proj = self.Map.projinfo['proj']
        #        if proj == 'll':
        #            barcmd = 'd.barscale -n'
        #        else:
        #            barcmd = 'd.barscale'

        # decoration overlay control dialog
        self.dialogs['barscale'] = \
            gdialogs.DecorationDialog(parent = self, title = _('Scale and North arrow'),
                                      size = (350, 200),
                                      style = wx.DEFAULT_DIALOG_STYLE | wx.CENTRE,
                                      cmd = ['d.barscale', 'at=0,95'],
                                      ovlId = id,
                                      name = 'barscale',
                                      checktxt = _("Show/hide scale and North arrow"),
                                      ctrltxt = _("scale object"))

        self.dialogs['barscale'].CentreOnParent()
        ### dialog cannot be show as modal - in the result d.barscale is not selectable
        ### self.dialogs['barscale'].ShowModal()
        self.dialogs['barscale'].Show()
        self.MapWindow.mouse['use'] = 'pointer'

    def OnAddLegend(self, event):
        """!Handler for legend map decoration menu selection.
        """
        if self.dialogs['legend']:
            return
        
        id = 1 # index for overlay layer in render

        cmd = ['d.legend', 'at=5,50,2,5']
        if self.tree.layer_selected and \
                self.tree.GetPyData(self.tree.layer_selected)[0]['type'] == 'raster':
            cmd.append('map=%s' % self.tree.GetPyData(self.tree.layer_selected)[0]['maplayer'].name)

        # Decoration overlay control dialog
        self.dialogs['legend'] = \
            gdialogs.DecorationDialog(parent = self, title = ('Legend'),
                                      size = (350, 200),
                                      style = wx.DEFAULT_DIALOG_STYLE | wx.CENTRE,
                                      cmd = cmd,
                                      ovlId = id,
                                      name = 'legend',
                                      checktxt = _("Show/hide legend"),
                                      ctrltxt = _("legend object")) 

        self.dialogs['legend'].CentreOnParent() 
        ### dialog cannot be show as modal - in the result d.legend is not selectable
        ### self.dialogs['legend'].ShowModal()
        self.dialogs['legend'].Show()
        self.MapWindow.mouse['use'] = 'pointer'

    def OnAddText(self, event):
        """!Handler for text decoration menu selection.
        """
        if self.MapWindow.dragid > -1:
            id = self.MapWindow.dragid
        else:
            # index for overlay layer in render
            if len(self.MapWindow.textdict.keys()) > 0:
                id = self.MapWindow.textdict.keys()[-1] + 1
            else:
                id = 101

        self.dialogs['text'] = gdialogs.TextLayerDialog(parent = self, ovlId = id, 
                                                        title = _('Add text layer'),
                                                        size = (400, 200))
        self.dialogs['text'].CenterOnParent()

        # If OK button pressed in decoration control dialog
        if self.dialogs['text'].ShowModal() == wx.ID_OK:
            text = self.dialogs['text'].GetValues()['text']
            active = self.dialogs['text'].GetValues()['active']
            coords, w, h = self.MapWindow.TextBounds(self.dialogs['text'].GetValues())
        
            # delete object if it has no text or is not active
            if text == '' or active == False:
                try:
                    self.MapWindow.pdc.ClearId(id)
                    self.MapWindow.pdc.RemoveId(id)
                    del self.MapWindow.textdict[id]
                except:
                    pass
                return

            self.MapWindow.pdc.ClearId(id)
            self.MapWindow.pdc.SetId(id)
            self.MapWindow.textdict[id] = self.dialogs['text'].GetValues()
            
            self.MapWindow.Draw(self.MapWindow.pdcDec, img = self.MapWindow.textdict[id],
                                drawid = id, pdctype = 'text', coords = coords)
            
            self.MapWindow.UpdateMap(render = False, renderVector = False)
            
        self.MapWindow.mouse['use'] = 'pointer'

    def GetOptData(self, dcmd, type, params, propwin):
        """!Callback method for decoration overlay command generated by
        dialog created in menuform.py
        """
        # Reset comand and rendering options in render.Map. Always render decoration.
        # Showing/hiding handled by PseudoDC
        self.Map.ChangeOverlay(ovltype = type, type = 'overlay', name = '', command = dcmd,
                               l_active = True, l_render = False)
        self.params[type] = params
        self.propwin[type] = propwin

    def OnZoomToMap(self, event):
        """!Set display extents to match selected raster (including
        NULLs) or vector map.
        """
        self.MapWindow.ZoomToMap()

    def OnZoomToRaster(self, event):
        """!Set display extents to match selected raster map (ignore NULLs)
        """
        self.MapWindow.ZoomToMap(ignoreNulls = True)

    def OnZoomToWind(self, event):
        """!Set display geometry to match computational region
        settings (set with g.region)
        """
        self.MapWindow.ZoomToWind()
        
    def OnZoomToDefault(self, event):
        """!Set display geometry to match default region settings
        """
        self.MapWindow.ZoomToDefault()
        
    def OnZoomToSaved(self, event):
        """!Set display geometry to match extents in
        saved region file
        """
        self.MapWindow.ZoomToSaved()
        
    def OnDisplayToWind(self, event):
        """!Set computational region (WIND file) to match display
        extents
        """
        self.MapWindow.DisplayToWind()
 
    def SaveDisplayRegion(self, event):
        """!Save display extents to named region file.
        """
        self.MapWindow.SaveDisplayRegion()
        
    def OnZoomMenu(self, event):
        """!Popup Zoom menu
        """
        point = wx.GetMousePosition()
        zoommenu = wx.Menu()
        # Add items to the menu

        zoomwind = wx.MenuItem(zoommenu, wx.ID_ANY, _('Zoom to computational region'))
        zoommenu.AppendItem(zoomwind)
        self.Bind(wx.EVT_MENU, self.OnZoomToWind, zoomwind)

        zoomdefault = wx.MenuItem(zoommenu, wx.ID_ANY, _('Zoom to default region'))
        zoommenu.AppendItem(zoomdefault)
        self.Bind(wx.EVT_MENU, self.OnZoomToDefault, zoomdefault)

        zoomsaved = wx.MenuItem(zoommenu, wx.ID_ANY, _('Zoom to saved region'))
        zoommenu.AppendItem(zoomsaved)
        self.Bind(wx.EVT_MENU, self.OnZoomToSaved, zoomsaved)

        savewind = wx.MenuItem(zoommenu, wx.ID_ANY, _('Set computational region from display'))
        zoommenu.AppendItem(savewind)
        self.Bind(wx.EVT_MENU, self.OnDisplayToWind, savewind)

        savezoom = wx.MenuItem(zoommenu, wx.ID_ANY, _('Save display geometry to named region'))
        zoommenu.AppendItem(savezoom)
        self.Bind(wx.EVT_MENU, self.SaveDisplayRegion, savezoom)

        # Popup the menu. If an item is selected then its handler
        # will be called before PopupMenu returns.
        self.PopupMenu(zoommenu)
        zoommenu.Destroy()
        
    def SetProperties(self, render = False, mode = 0, showCompExtent = False,
                      constrainRes = False, projection = False):
        """!Set properies of map display window"""
        self.statusbarWin['render'].SetValue(render)
        self.statusbarWin['toggle'].SetSelection(mode)
        self.StatusbarUpdate()
        self.statusbarWin['region'].SetValue(showCompExtent)
        self.statusbarWin['resolution'].SetValue(constrainRes)
        self.statusbarWin['projection'].SetValue(projection)
        if showCompExtent:
            self.MapWindow.regionCoords = []
        
    def IsStandalone(self):
        """!Check if Map display is standalone"""
        if self._layerManager:
            return False
        
        return True
    
    def GetLayerManager(self):
        """!Get reference to Layer Manager

        @return window reference
        @return None (if standalone)
        """
        return self._layerManager
    
class MapApp(wx.App):
    def OnInit(self):
        wx.InitAllImageHandlers()
        if __name__ == "__main__":
            self.cmdTimeStamp = os.path.getmtime(monFile['cmd'])
            Map = render.Map(cmdfile = monFile['cmd'], mapfile = monFile['map'],
                             envfile = monFile['env'], monitor = monName)
        else:
            Map = None
        
        self.mapFrm = MapFrame(parent = None, id = wx.ID_ANY, Map = Map,
                               size = globalvar.MAP_WINDOW_SIZE)
        # self.SetTopWindow(Map)
        self.mapFrm.Show()
        
        if __name__ == "__main__":
            #status = Command(self, Map, cmdfile)
            # status.start()
            self.timer = wx.PyTimer(self.watcher)
            #check each 0.5s
            global mtime
            mtime = 500
            self.timer.Start(mtime)
            
        return True
    
    def OnExit(self):
        if __name__ == "__main__":
            # stop the timer
            # self.timer.Stop()
            # terminate thread
            for f in monFile.itervalues():
                grass.try_remove(f)
            
    def watcher(self):
        """!Redraw, if new layer appears (check's timestamp of
        cmdfile)
        """
        # todo: events
        if os.path.getmtime(monFile['cmd']) > self.cmdTimeStamp:
            self.timer.Stop()
            self.cmdTimeStamp = os.path.getmtime(monFile['cmd'])
            self.mapFrm.OnDraw(None)
            self.timer.Start(mtime)
        
if __name__ == "__main__":
    # set command variable
    if len(sys.argv) != 5:
        print __doc__
        sys.exit(1)
    
    monName = sys.argv[1]
    monFile = { 'map' : sys.argv[2],
                'cmd' : sys.argv[3],
                'env' : sys.argv[4],
                }
    
    import gettext
    gettext.install('grasswxpy', os.path.join(os.getenv("GISBASE"), 'locale'), unicode = True)
    
    grass.verbose(_("Starting map display <%s>...") % (monName))

    gcmd.RunCommand('g.gisenv',
                    set = 'MONITOR_%s_PID=%d' % (monName, os.getpid()))
    
    gm_map = MapApp(0)
    # set title
    gm_map.mapFrm.SetTitle(_("GRASS GIS Map Display: " +
                             monName + 
                             " - Location: " + grass.gisenv()["LOCATION_NAME"]))
    
    gm_map.MainLoop()
    
    grass.verbose(_("Stopping map display <%s>...") % (monName))

    # clean up GRASS env variables
    env = grass.gisenv()
    env_name = 'MONITOR_%s' % monName
    for key in env.keys():
        if key.find(env_name) == 0:
            gcmd.RunCommand('g.gisenv',
                              set = '%s=' % key)
        if key == 'MONITOR' and env[key] == monName:
            gcmd.RunCommand('g.gisenv',
                            set = '%s=' % key)
    
    sys.exit(0)