# -*- coding: utf-8 -*- """ Created on Wed Jul 18 10:46:25 2012 @author: pietro """ import ctypes import numpy as np import re import grass.lib.gis as libgis import grass.lib.vector as libvect from basic import Ilist, Bbox, Cats WKT = {'POINT\((.*)\)': 'point', # 'POINT\(\s*([+-]*\d+\.*\d*)+\s*\)' 'LINESTRING\((.*)\)': 'line'} def read_WKT(string): """Read the string and return a geometry object WKT: POINT(0 0) LINESTRING(0 0,1 1,1 2) POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1)) MULTIPOINT(0 0,1 2) MULTILINESTRING((0 0,1 1,1 2),(2 3,3 2,5 4)) MULTIPOLYGON(((0 0,4 0,4 4,0 4,0 0),(1 1,2 1,2 2,1 2,1 1)), ((-1 -1,-1 -2,-2 -2,-2 -1,-1 -1))) GEOMETRYCOLLECTION(POINT(2 3),LINESTRING(2 3,3 4)) EWKT: POINT(0 0 0) -- XYZ SRID=32632;POINT(0 0) -- XY with SRID POINTM(0 0 0) -- XYM POINT(0 0 0 0) -- XYZM SRID=4326;MULTIPOINTM(0 0 0,1 2 1) -- XYM with SRID MULTILINESTRING((0 0 0,1 1 0,1 2 1),(2 3 1,3 2 1,5 4 1)) POLYGON((0 0 0,4 0 0,4 4 0,0 4 0,0 0 0),(1 1 0,2 1 0,2 2 0,1 2 0,1 1 0)) MULTIPOLYGON(((0 0 0,4 0 0,4 4 0,0 4 0,0 0 0), (1 1 0,2 1 0,2 2 0,1 2 0,1 1 0)), ((-1 -1 0,-1 -2 0,-2 -2 0,-2 -1 0,-1 -1 0))) GEOMETRYCOLLECTIONM( POINTM(2 3 9), LINESTRINGM(2 3 4, 3 4 5) ) MULTICURVE( (0 0, 5 5), CIRCULARSTRING(4 0, 4 4, 8 4) ) POLYHEDRALSURFACE( ((0 0 0, 0 0 1, 0 1 1, 0 1 0, 0 0 0)), ((0 0 0, 0 1 0, 1 1 0, 1 0 0, 0 0 0)), ((0 0 0, 1 0 0, 1 0 1, 0 0 1, 0 0 0)), ((1 1 0, 1 1 1, 1 0 1, 1 0 0, 1 1 0)), ((0 1 0, 0 1 1, 1 1 1, 1 1 0, 0 1 0)), ((0 0 1, 1 0 1, 1 1 1, 0 1 1, 0 0 1)) ) TRIANGLE ((0 0, 0 9, 9 0, 0 0)) TIN( ((0 0 0, 0 0 1, 0 1 0, 0 0 0)), ((0 0 0, 0 1 0, 1 1 0, 0 0 0)) ) """ for regexp, obj in WKT.items(): if re.match(regexp, string): geo = 10 return obj(geo) def read_WKB(buff): """Read the binary buffer and return a geometry object""" pass #============================================= # GEOMETRY #============================================= def get_xyz(pnt): """Return a tuple with: x, y, z. :: >>> pnt = Point(0, 0) >>> get_xyz(pnt) (0.0, 0.0, 0.0) >>> get_xyz((1, 1)) (1, 1, 0.0) >>> get_xyz((1, 1, 2)) (1, 1, 2) >>> get_xyz((1, 1, 2, 2)) #doctest: +ELLIPSIS Traceback (most recent call last): ... ValueError: The the format of the point is not supported: (1, 1, 2, 2) .. """ if isinstance(pnt, Point): if pnt.is2D: x, y = pnt.x, pnt.y z = 0. else: x, y, z = pnt.x, pnt.y, pnt.z else: if len(pnt) == 2: x, y = pnt z = 0. elif len(pnt) == 3: x, y, z = pnt else: str_error = "The the format of the point is not supported: {0!r}" raise ValueError(str_error.format(pnt)) return x, y, z class Geo(object): """ >>> geo0 = Geo() >>> points = ctypes.pointer(libvect.line_pnts()) >>> cats = ctypes.pointer(libvect.line_cats()) >>> geo1 = Geo(c_points=points, c_cats=cats) """ def __init__(self, v_id=None, c_mapinfo=None, c_points=None, c_cats=None): self.id = v_id # vector id self.c_mapinfo = c_mapinfo # set c_points if c_points is None: self.c_points = ctypes.pointer(libvect.line_pnts()) else: self.c_points = c_points # set c_cats if c_cats is None: self.c_cats = ctypes.pointer(libvect.line_cats()) else: self.c_cats = c_cats def is_with_topology(self): if self.c_mapinfo is not None: return self.c_mapinfo.contents.level == 2 else: return False def read(self): """Read and set the coordinates of the centroid from the vector map, using the centroid_id and calling the Vect_read_line C function""" libvect.Vect_read_line(self.c_mapinfo, self.c_points, self.c_cats, self.id) def write(self): """Write the centroid to the Map.""" libvect.Vect_write_line(self.c_mapinfo, libvect.GV_CENTROID, self.c_points, self.c_cats) class Point(Geo): """Instantiate a Point object that could be 2 or 3D, default parameters are 0. :: >>> pnt = Point() >>> pnt.x 0.0 >>> pnt.y 0.0 >>> pnt.z >>> pnt.is2D True >>> pnt Point(0.000000, 0.000000) >>> pnt.z = 0 >>> pnt.is2D False >>> pnt Point(0.000000, 0.000000, 0.000000) >>> print pnt POINT(0.000000, 0.000000, 0.000000) .. """ def __init__(self, x=0, y=0, z=None, is2D=True, **kargs): super(Point, self).__init__(**kargs) if self.id is not None: self.read() self.is2D = is2D else: self.is2D = True if z is None else False z = z if z is not None else 0 libvect.Vect_append_point(self.c_points, x, y, z) # geometry type self.gtype = libvect.GV_POINT def _get_x(self): return self.c_points.contents.x[0] def _set_x(self, value): self.c_points.contents.x[0] = value x = property(fget=_get_x, fset=_set_x) def _get_y(self): return self.c_points.contents.y[0] def _set_y(self, value): self.c_points.contents.y[0] = value y = property(fget=_get_y, fset=_set_y) def _get_z(self): if self.is2D: return None return self.c_points.contents.z[0] def _set_z(self, value): if value is None: self.is2D = True self.c_points.contents.z[0] = 0 else: self.c_points.contents.z[0] = value self.is2D = False z = property(fget=_get_z, fset=_set_z) def __str__(self): return self.get_wkt() def __repr__(self): return "Point(%s)" % ', '.join(['%f' % coor for coor in self.coords()]) def __eq__(self, pnt): if isinstance(pnt, Point): return pnt.coords() == self.coords() return Point(*pnt).coords() == self.coords() def coords(self): """Return a tuple with the point coordinates. :: >>> pnt = Point(10, 100) >>> pnt.coords() (10.0, 100.0) If the point is 2D return a x, y tuple. But if we change the ``z`` the Point object become a 3D point, therefore the method return a x, y, z tuple. :: >>> pnt.z = 1000. >>> pnt.coords() (10.0, 100.0, 1000.0) .. """ if self.is2D: return self.x, self.y else: return self.x, self.y, self.z def get_wkt(self): """Return a "well know text" (WKT) geometry string. :: >>> pnt = Point(10, 100) >>> pnt.get_wkt() 'POINT(10.000000, 100.000000)' .. warning:: Only ``POINT`` (2/3D) are supported, ``POINTM`` and ``POINT`` with: ``XYZM`` are not supported yet. """ return "POINT(%s)" % ', '.join(['%f' % coord for coord in self.coords()]) def get_wkb(self): """Return a "well know binary" (WKB) geometry buffer .. warning:: Not implemented yet. """ pass def distance(self, pnt): """Calculate distance of 2 points, using the Vect_points_distance C function, If one of the point have z == None, return the 2D distance. :: >>> pnt0 = Point(0, 0, 0) >>> pnt1 = Point(1, 0) >>> pnt0.distance(pnt1) 1.0 >>> pnt1.z = 1 >>> pnt1 Point(1.000000, 0.000000, 1.000000) >>> pnt0.distance(pnt1) 1.4142135623730951 The distance method require a :class:Point or a tuple with the coordinates. """ if self.is2D or pnt.is2D: return libvect.Vect_points_distance(self.x, self.y, 0, pnt.x, pnt.y, 0, 0) else: return libvect.Vect_points_distance(self.x, self.y, self.z, pnt.x, pnt.y, pnt.z, 1) def buffer(self, dist=None, dist_x=None, dist_y=None, angle=0, round_=True, tol=0.1): """Return an Area object using the ``Vect_point_buffer2`` C function. Creates buffer around the point (px, py). """ print "Not implemented yet" raise if dist is not None: dist_x = dist dist_y = dist area = Area() libvect.Vect_point_buffer2(self.x, self.y, dist_x, dist_y, angle, int(round_), tol, area.c_points) return area class Line(Geo): """Instantiate a new Line with a list of tuple, or with a list of Point. :: >>> line = Line([(0, 0), (1, 1), (2, 0), (1, -1)]) >>> line #doctest: +NORMALIZE_WHITESPACE Line([Point(0.000000, 0.000000), Point(1.000000, 1.000000), Point(2.000000, 0.000000), Point(1.000000, -1.000000)]) .. """ def __init__(self, points=None, is2D=True, **kargs): super(Line, self).__init__(**kargs) if points is not None: for pnt in points: self.append(pnt) self.is2D = is2D # geometry type self.gtype = libvect.GV_LINE def __getitem__(self, key): """Get line point of given index, slice allowed. :: >>> line = Line([(0, 0), (1, 1), (2, 2), (3, 3)]) >>> line[1] Point(1.000000, 1.000000) >>> line[-1] Point(3.000000, 3.000000) >>> line[:2] [Point(0.000000, 0.000000), Point(1.000000, 1.000000)] .. """ #TODO: # line[0].x = 10 is not working #pnt.c_px = ctypes.pointer(self.c_points.contents.x[indx]) # pnt.c_px = ctypes.cast(id(self.c_points.contents.x[indx]), # ctypes.POINTER(ctypes.c_double)) if isinstance(key, slice): #import pdb; pdb.set_trace() #Get the start, stop, and step from the slice return [Point(self.c_points.contents.x[indx], self.c_points.contents.y[indx], None if self.is2D else self.c_points.contents.z[indx]) for indx in xrange(*key.indices(len(self)))] elif isinstance(key, int): if key < 0: # Handle negative indices key += self.c_points.contents.n_points if key >= self.c_points.contents.n_points: raise IndexError('Index out of range') return Point(self.c_points.contents.x[key], self.c_points.contents.y[key], None if self.is2D else self.c_points.contents.z[key]) else: raise ValueError("Invalid argument type: %r." % key) def __setitem__(self, indx, pnt): """Change the coordinate of point. :: >>> line = Line([(0, 0), (1, 1)]) >>> line[0] = (2, 2) >>> line Line([Point(2.000000, 2.000000), Point(1.000000, 1.000000)]) .. """ x, y, z = get_xyz(pnt) self.c_points.contents.x[indx] = x self.c_points.contents.y[indx] = y self.c_points.contents.z[indx] = z def __iter__(self): """Return a Point generator of the Line""" return (self.__getitem__(i) for i in range(self.__len__())) def __len__(self): """Return the number of points of the line.""" return self.c_points.contents.n_points def __str__(self): return self.get_wkt() def __repr__(self): return "Line([%s])" % ', '.join([repr(pnt) for pnt in self.__iter__()]) def get_pnt(self, distance, angle=0, slope=0): """Return a Point object on line in the specified distance, using the `Vect_point_on_line` C function. Raise a ValueError If the distance exceed the Line length. :: >>> line = Line([(0, 0), (1, 1)]) >>> line.get_pnt(5) #doctest: +ELLIPSIS +NORMALIZE_WHITESPACE Traceback (most recent call last): ... ValueError: The distance exceed the lenght of the line, that is: 1.414214 >>> line.get_pnt(1) Point(0.707107, 0.707107) .. """ # instantiate an empty Point object maxdist = self.length() if distance > maxdist: str_err = "The distance exceed the lenght of the line, that is: %f" raise ValueError(str_err % maxdist) pnt = Point(0, 0, -9999) libvect.Vect_point_on_line(self.c_points, distance, pnt.c_points.contents.x, pnt.c_points.contents.y, pnt.c_points.contents.z, angle, slope) pnt.is2D = self.is2D return pnt def append(self, pnt): """Appends one point to the end of a line, using the ``Vect_append_point`` C function. :: >>> line = Line() >>> line.append((10, 100)) >>> line Line([Point(10.000000, 100.000000)]) >>> line.append((20, 200)) >>> line Line([Point(10.000000, 100.000000), Point(20.000000, 200.000000)]) Like python list. """ x, y, z = get_xyz(pnt) libvect.Vect_append_point(self.c_points, x, y, z) def bbox(self): """Return the bounding box of the line, using ``Vect_line_box`` C function. :: >>> line = Line([(0, 0), (0, 1), (2, 1), (2, 0)]) >>> bbox = line.bbox() >>> bbox Bbox(1.0, 0.0, 2.0, 0.0) .. """ bbox = Bbox() libvect.Vect_line_box(self.c_points, bbox.c_bbox) return bbox def extend(self, line, forward=True): """Appends points to the end of a line. It is possible to extend a line, give a list of points, or directly with a line_pnts struct. If forward is True the line is extend forward otherwise is extend backward. The method use the `Vect_append_points` C function. :: >>> line = Line([(0, 0), (1, 1)]) >>> line.extend( Line([(2, 2), (3, 3)]) ) >>> line #doctest: +NORMALIZE_WHITESPACE Line([Point(0.000000, 0.000000), Point(1.000000, 1.000000), Point(2.000000, 2.000000), Point(3.000000, 3.000000)]) Like python list, it is possible to extend a line, with another line or with a list of points. """ # set direction if forward: direction = libvect.GV_FORWARD else: direction = libvect.GV_BACKWARD # check if is a Line object if isinstance(line, Line): c_points = line.c_points else: # instantiate a Line object lin = Line() for pnt in line: # add the points to the line lin.append(pnt) c_points = lin.c_points libvect.Vect_append_points(self.c_points, c_points, direction) def insert(self, indx, pnt): """Insert new point at index position and move all old points at that position and above up, using ``Vect_line_insert_point`` C function. :: >>> line = Line([(0, 0), (1, 1)]) >>> line.insert(0, Point(1.000000, -1.000000) ) >>> line #doctest: +NORMALIZE_WHITESPACE Line([Point(1.000000, -1.000000), Point(0.000000, 0.000000), Point(1.000000, 1.000000)]) .. """ if indx < 0: # Handle negative indices indx += self.c_points.contents.n_points if indx >= self.c_points.contents.n_points: raise IndexError('Index out of range') x, y, z = get_xyz(pnt) libvect.Vect_line_insert_point(self.c_points, indx, x, y, z) def length(self): """Calculate line length, 3D-length in case of 3D vector line, using `Vect_line_length` C function. :: >>> line = Line([(0, 0), (1, 1), (0, 1)]) >>> line.length() 2.414213562373095 .. """ return libvect.Vect_line_length(self.c_points) def length_geodesic(self): """Calculate line length, usig `Vect_line_geodesic_length` C function. :: >>> line = Line([(0, 0), (1, 1), (0, 1)]) >>> line.length_geodesic() 2.414213562373095 .. """ return libvect.Vect_line_geodesic_length(self.c_points) def distance(self, pnt): """Return a tuple with: * the closest point on the line, * the distance between these two points, * distance of point from segment beginning * distance of point from line The distance is compute using the ``Vect_line_distance`` C function. """ # instantite outputs cx = ctypes.c_double(0) cy = ctypes.c_double(0) cz = ctypes.c_double(0) dist = ctypes.c_double(0) sp_dist = ctypes.c_double(0) lp_dist = ctypes.c_double(0) libvect.Vect_line_distance(self.c_points, pnt.x, pnt.y, pnt.z, 0 if self.is2D else 1, ctypes.byref(cx), ctypes.byref(cy), ctypes.byref(cz), ctypes.byref(dist), ctypes.byref(sp_dist), ctypes.byref(lp_dist)) # instantiate the Point class point = Point(cx.value, cy.value, cz.value) point.is2D = self.is2D return point, dist, sp_dist, lp_dist def get_first_cat(self): """Fetches FIRST category number for given vector line and field, using the ``Vect_get_line_cat`` C function. .. warning:: Not implemented yet. """ # TODO: add this method. libvect.Vect_get_line_cat(self.map, self.id, self.field) pass def pop(self, indx): """Return the point in the index position and remove from the Line. :: >>> line = Line([(0, 0), (1, 1), (2, 2)]) >>> midle_pnt = line.pop(1) >>> midle_pnt Point(1.000000, 1.000000) >>> line Line([Point(0.000000, 0.000000), Point(2.000000, 2.000000)]) .. """ if indx < 0: # Handle negative indices indx += self.c_points.contents.n_points if indx >= self.c_points.contents.n_points: raise IndexError('Index out of range') pnt = self.__getitem__(indx) libvect.Vect_line_delete_point(self.c_points, indx) return pnt def delete(self, indx): """Remove the point in the index position. :: >>> line = Line([(0, 0), (1, 1), (2, 2)]) >>> line.delete(-1) >>> line Line([Point(0.000000, 0.000000), Point(1.000000, 1.000000)]) .. """ if indx < 0: # Handle negative indices indx += self.c_points.contents.n_points if indx >= self.c_points.contents.n_points: raise IndexError('Index out of range') libvect.Vect_line_delete_point(self.c_points, indx) def prune(self): """Remove duplicate points, i.e. zero length segments, using `Vect_line_prune` C function. :: >>> line = Line([(0, 0), (1, 1), (1, 1), (2, 2)]) >>> line.prune() >>> line #doctest: +NORMALIZE_WHITESPACE Line([Point(0.000000, 0.000000), Point(1.000000, 1.000000), Point(2.000000, 2.000000)]) .. """ libvect.Vect_line_prune(self.c_points) def prune_thresh(self, threshold): """Remove points in threshold, using the ``Vect_line_prune_thresh`` C funtion. :: >>> line = Line([(0, 0), (1.0, 1.0), (1.2, 0.9), (2, 2)]) >>> line.prune_thresh(0.5) >>> line #doctest: +SKIP +NORMALIZE_WHITESPACE Line([Point(0.000000, 0.000000), Point(1.000000, 1.000000), Point(2.000000, 2.000000)]) .. warning :: prune_thresh is not working yet. """ libvect.Vect_line_prune(self.c_points, ctypes.c_double(threshold)) def remove(self, pnt): """Delete point at given index and move all points above down, using `Vect_line_delete_point` C function. :: >>> line = Line([(0, 0), (1, 1), (2, 2)]) >>> line.remove((2, 2)) >>> line[-1] Point(1.000000, 1.000000) .. """ for indx, point in enumerate(self.__iter__()): if pnt == point: libvect.Vect_line_delete_point(self.c_points, indx) return raise ValueError('list.remove(x): x not in list') def reverse(self): """Reverse the order of vertices, using `Vect_line_reverse` C function. :: >>> line = Line([(0, 0), (1, 1), (2, 2)]) >>> line.reverse() >>> line #doctest: +NORMALIZE_WHITESPACE Line([Point(2.000000, 2.000000), Point(1.000000, 1.000000), Point(0.000000, 0.000000)]) .. """ libvect.Vect_line_reverse(self.c_points) def segment(self, start, end): """Create line segment. using the ``Vect_line_segment`` C function.""" line = Line() libvect.Vect_line_segment(self.c_points, start, end, line.c_points) return line def tolist(self): """Return a list of tuple. :: >>> line = Line([(0, 0), (1, 1), (2, 0), (1, -1)]) >>> line.tolist() [(0.0, 0.0), (1.0, 1.0), (2.0, 0.0), (1.0, -1.0)] .. """ return [pnt.coords() for pnt in self.__iter__()] def toarray(self): """Return an array of coordinates. :: >>> line = Line([(0, 0), (1, 1), (2, 0), (1, -1)]) >>> line.toarray() #doctest: +NORMALIZE_WHITESPACE array([[ 0., 0.], [ 1., 1.], [ 2., 0.], [ 1., -1.]]) .. """ return np.array(self.tolist()) def get_wkt(self): """Return a Well Known Text string of the line. :: >>> line = Line([(0, 0), (1, 1), (1, 2)]) >>> line.get_wkt() #doctest: +ELLIPSIS 'LINESTRING(0.000000 0.000000, ..., 1.000000 2.000000)' .. """ return "LINESTRING(%s)" % ', '.join([ ' '.join(['%f' % coord for coord in pnt.coords()]) for pnt in self.__iter__()]) def from_wkt(self, wkt): """Read a WKT string. :: >>> line = Line() >>> line.from_wkt("LINESTRING(0 0,1 1,1 2)") >>> line #doctest: +NORMALIZE_WHITESPACE Line([Point(0.000000, 0.000000), Point(1.000000, 1.000000), Point(1.000000, 2.000000)]) .. """ match = re.match('LINESTRING\((.*)\)', wkt) if match: self.reset() for coord in match.groups()[0].strip().split(','): self.append(tuple([float(e) for e in coord.split(' ')])) else: return None def get_wkb(self): """Return a WKB buffer. .. warning:: Not implemented yet. """ pass def buffer(self, dist=None, dist_x=None, dist_y=None, angle=0, round_=True, tol=0.1): """Return the buffer area around the line, using the ``Vect_line_buffer2`` C function. .. warning:: Not implemented yet. """ if dist is not None: dist_x = dist dist_y = dist area = Area() libvect.Vect_line_buffer2(self.c_points, dist_x, dist_y, angle, int(round_), tol, area.boundary.c_points, area.isles.c_points, area.num_isles) return area def reset(self): """Reset line, using `Vect_reset_line` C function. :: >>> line = Line([(0, 0), (1, 1), (2, 0), (1, -1)]) >>> len(line) 4 >>> line.reset() >>> len(line) 0 >>> line Line([]) .. """ libvect.Vect_reset_line(self.c_points) class Node(object): pass class Boundary(Line): """ """ def __init__(self, area_id=None, lines=None, left=None, right=None, **kargs): super(Boundary, self).__init__(**kargs) self.area_id = area_id self.ilist = Ilist() self.lines = lines if lines: if len(lines) != len(left) or len(lines) != len(right): str_err = "Left and right must have the same length of lines" raise ValueError(str_err) self.left = Ilist() self.right = Ilist() # geometry type self.gtype = libvect.GV_BOUNDARY def __repr__(self): return "Boundary(v_id=%r)" % self.id def boundaries(self): """Returna Ilist object with the line id""" bounds = Ilist() libvect.Vect_get_area_boundaries(self.c_mapinfo, self.area_id, bounds.c_ilist) return bounds def get_left_right(self): """Return left and right value""" left = ctypes.poiter(ctypes.c_int()) right = ctypes.poiter(ctypes.c_int()) libvect.Vect_get_line_areas(self.c_mapinfo, self.id, left, right) return left.contents.value, right.contents.value class Centroid(Point): """The Centroid class inherit from the Point class. Centroid contains an attribute with the C Map_info struct, and attributes with the id of the Area. :: >>> centroid = Centroid(x=0, y=10) >>> centroid Centoid(0.000000, 10.000000) >>> import pygrass >>> mun = pygrass.vector.VectorTopo('boundary_municp_sqlite') >>> mun.open() >>> centroid = Centroid(v_id=5129, c_mapinfo=mun.c_mapinfo) >>> centroid Centoid(463784.493822, 311023.913274) .. """ def __init__(self, area_id=None, **kargs): super(Centroid, self).__init__(**kargs) self.area_id = area_id if self.id and self.c_mapinfo and self.area_id is None: self.area_id = self.get_area_id() elif self.c_mapinfo and self.area_id and self.id is None: self.id = self.get_centroid_id() if self.area_id is not None: self.cats = Cats(c_mapinfo=self.c_mapinfo, v_id=self.area_id) #TODO: why not pass the self.id? self.read() # geometry type self.gtype = libvect.GV_CENTROID #self.c_pline = ctypes.pointer(libvect.P_line()) if topology else None def __repr__(self): return "Centoid(%s)" % ', '.join(['%f' % co for co in self.coords()]) def get_centroid_id(self): """Return the centroid_id, using the c_mapinfo and an area_id attributes of the class, and calling the Vect_get_area_centroid C function, if no centroid_id were found return None""" centroid_id = libvect.Vect_get_area_centroid(self.c_mapinfo, self.area_id) return centroid_id if centroid_id != 0 else None def get_area_id(self): """Return the area_id, using the c_mapinfo and an centroid_id attributes of the class, and calling the Vect_get_centroid_area C function, if no area_id were found return None""" area_id = libvect.Vect_get_centroid_area(self.c_mapinfo, self.id) return area_id if area_id != 0 else None class Isle(Geo): """An Isle is an area contained by another area. """ def __init__(self, **kargs): super(Isle, self).__init__(**kargs) #self.area_id = area_id def __repr__(self): return "Isle(%d)" % (self.id) def boundaries(self): ilist = Ilist() libvect.Vect_get_isle_boundaries(self.c_mapinfo, self.id, ilist.c_ilist) return ilist def bbox(self): bbox = Bbox() libvect.Vect_get_isle_box(self.c_mapinfo, self.id, bbox.c_bbox) return bbox def points(self): """Return a Line object with the outer ring points""" line = Line() libvect.Vect_get_isle_points(self.c_mapinfo, self.id, line.c_points) return line def points_geos(self): """Return a Line object with the outer ring points """ return libvect.Vect_get_isle_points_geos(self.c_mapinfo, self.id) def area_id(self): """Returns area id for isle.""" return libvect.Vect_get_isle_area(self.c_mapinfo, self.id) def alive(self): """Check if isle is alive or dead (topology required)""" return bool(libvect.Vect_isle_alive(self.c_mapinfo, self.id)) def contain_pnt(self, pnt): """Check if point is in area.""" bbox = self.bbox() return bool(libvect.Vect_point_in_island(pnt.x, pnt.y, self.c_mapinfo, self.id, bbox.c_bbox.contents)) def area(self): """Return the area value of an Isle""" border = self.points() return libgis.G_area_of_polygon(border.c_points.contents.x, border.c_points.contents.y, border.c_points.contents.n_points) def perimeter(self): """Return the perimeter value of an Isle. :: double Vect_area_perimeter() """ border = self.points() return libvect.Vect_area_perimeter(border.c_points) class Isles(object): def __init__(self, c_mapinfo, area_id): self.c_mapinfo = c_mapinfo self.area_id = area_id self._isles_id = self.get_isles_id() self._isles = self.get_isles() def __len__(self): return libvect.Vect_get_area_num_isles(self.c_mapinfo, self.area_id) def __repr__(self): return "Isles(%r)" % self._isles def __getitem__(self, key): return self._isles[key] def get_isles_id(self): return [libvect.Vect_get_area_isle(self.c_mapinfo, self.area_id, i) for i in range(self.__len__())] def get_isles(self): return [Isle(v_id=isle_id, c_mapinfo=self.c_mapinfo) for isle_id in self._isles_id] def select_by_bbox(self, bbox): """Vect_select_isles_by_box""" pass class Area(Geo): """ 'Vect_build_line_area', 'Vect_find_area', 'Vect_get_area_box', 'Vect_get_area_points_geos', 'Vect_get_centroid_area', 'Vect_get_isle_area', 'Vect_get_line_areas', 'Vect_get_num_areas', 'Vect_get_point_in_area', 'Vect_isle_find_area', 'Vect_point_in_area', 'Vect_point_in_area_outer_ring', 'Vect_read_area_geos', 'Vect_remove_small_areas', 'Vect_select_areas_by_box', 'Vect_select_areas_by_polygon'] """ def __init__(self, boundary=None, centroid=None, isles=[], **kargs): super(Area, self).__init__(**kargs) self.boundary = self.points() self.centroid = self.centroid() self.isles = self.get_isles() # geometry type self.gtype = libvect.GV_AREA def __repr__(self): return "Area(%d)" % self.id def init_from_id(self, area_id=None): """Return an Area object""" if area_id is None and self.id is None: raise ValueError("You need to give or set the area_id") self.id = area_id if area_id is not None else self.id # get boundary self.get_boundary() # get isles self.get_isles() pass def points(self): """Return a Line object with the outer ring""" line = Line() libvect.Vect_get_area_points(self.c_mapinfo, self.id, line.c_points) return line def centroid(self): centroid_id = libvect.Vect_get_area_centroid(self.c_mapinfo, self.id) #import pdb; pdb.set_trace() return Centroid(v_id=centroid_id, c_mapinfo=self.c_mapinfo, area_id=self.id) def num_isles(self): return libvect.Vect_get_area_num_isles(self.c_mapinfo, self.id) def get_isles(self): """Instantiate the boundary attribute reading area_id""" return Isles(self.c_mapinfo, self.id) def area(self): """Returns area of area without areas of isles. double Vect_get_area_area (const struct Map_info *Map, int area) """ return libvect.Vect_get_area_area(self.c_mapinfo, self.id) def alive(self): """Check if area is alive or dead (topology required) """ return bool(libvect.Vect_area_alive(self.c_mapinfo, self.id)) def bbox(self): """ Vect_get_area_box """ bbox = Bbox() libvect.Vect_get_area_box(self.c_mapinfo, self.id, bbox.c_bbox) return bbox def buffer(self): """Creates buffer around area. Parameters: Map vector map area area id da distance along major axis db distance along minor axis dalpha angle between 0x and major axis round make corners round caps add caps at line ends tol maximum distance between theoretical arc and output segments [out] oPoints output polygon outer border (ccw order) [out] inner_count number of holes [out] iPoints array of output polygon's holes (cw order) void Vect_area_buffer2(const struct Map_info * Map, int area, double da, double db, double dalpha, int round, int caps, double tol, struct line_pnts ** oPoints, struct line_pnts *** iPoints, int * inner_count) """ pass def boundaries(self): """Creates list of boundaries for given area. int Vect_get_area_boundaries(const struct Map_info *Map, int area, struct ilist *List) """ ilist = Ilist() libvect.Vect_get_area_boundaries(self.c_mapinfo, self.id, ilist.c_ilist) return ilist def cats(self): """Get area categories. int Vect_get_area_cats (const struct Map_info *Map, int area, struct line_cats *Cats) """ return Cats(self.c_mapinfo, self.id) def get_first_cat(self): """Find FIRST category of given field and area. int Vect_get_area_cat(const struct Map_info *Map, int area, int field) """ pass def contain_pnt(self, pnt): """Check if point is in area. int Vect_point_in_area(double x, double y, const struct Map_info *Map, int area, struct bound_box box) """ bbox = self.bbox() libvect.Vect_point_in_area(pnt.x, pnt.y, self.c_mapinfo, self.id, bbox.c_bbox) return bbox def perimeter(self): """Calculate area perimeter. double Vect_area_perimeter (const struct line_pnts *Points) """ border = self.points() return libvect.Vect_area_perimeter(border.c_points)