Thuban/UI/view.py

# Copyright (c) 2001, 2002, 2003 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
# Frank Koormann <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

"""
Classes for display of a map and interaction with it
"""

__version__ = "$Revision$"

from Thuban import _

import os.path

from wxPython.wx import wxWindow, \
     wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
     EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW, \
     wxPlatform, wxBeginBusyCursor, wxEndBusyCursor, wxFileDialog, wxSAVE, \
     wxOVERWRITE_PROMPT, wxID_OK

# Export related stuff
if wxPlatform == '__WXMSW__':
    from wxPython.wx import wxMetaFileDC

from wxPython import wx

from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
     LAYER_VISIBILITY_CHANGED

from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer

import labeldialog

from viewport import ViewPort, PanTool, output_transform

class CanvasPanTool(PanTool):

    """The Canvas Pan Tool"""

    def MouseMove(self, event):
        if self.dragging:
            PanTool.MouseMove(self, event)
            sx, sy = self.start
            x, y = self.current
            width, height = self.view.GetSizeTuple()

            bitmapdc = wx.wxMemoryDC()
            bitmapdc.SelectObject(self.view.bitmap)

            dc = self.view.drag_dc
            dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)

class MapPrintout(wx.wxPrintout):

    """
    wxPrintout class for printing Thuban maps
    """

    def __init__(self, canvas, map, region, selected_layer, selected_shapes):
        wx.wxPrintout.__init__(self)
        self.canvas = canvas
        self.map = map
        self.region = region
        self.selected_layer = selected_layer
        self.selected_shapes = selected_shapes

    def GetPageInfo(self):
        return (1, 1, 1, 1)

    def HasPage(self, pagenum):
        return pagenum == 1

    def OnPrintPage(self, pagenum):
        if pagenum == 1:
            self.draw_on_dc(self.GetDC())

    def draw_on_dc(self, dc):
        width, height = self.GetPageSizePixels()
        scale, offset, mapregion = output_transform(self.canvas.scale,
                                                    self.canvas.offset,
                                                    self.canvas.GetSizeTuple(),
                                                    self.GetPageSizePixels())
        resx, resy = self.GetPPIPrinter()
        renderer = PrinterRenderer(dc, scale, offset, resolution = resy)
        x, y, width, height = self.region
        canvas_scale = self.canvas.scale
        renderer.RenderMap(self.map, 
                           (0,0,
                                (width/canvas_scale)*scale,
                                (height/canvas_scale)*scale), 
                                mapregion,
                           self.selected_layer, self.selected_shapes)
        return True

class MapCanvas(wxWindow, ViewPort):

    """A widget that displays a map and offers some interaction"""

    def __init__(self, parent, winid):
        wxWindow.__init__(self, parent, winid)
        ViewPort.__init__(self)

        self.SetBackgroundColour(wxColour(255, 255, 255))

        # the bitmap serving as backing store
        self.bitmap = None

        self.backgroundColor = wx.wxWHITE_BRUSH

        # Set to true if there ever is an error during redraw. There
        # should never be errors, but unfortunately bugs happen.
        self.error_on_redraw = 0

        # subscribe the WX events we're interested in
        EVT_PAINT(self, self.OnPaint)
        EVT_LEFT_DOWN(self, self.OnLeftDown)
        EVT_LEFT_UP(self, self.OnLeftUp)
        EVT_MOTION(self, self.OnMotion)
        EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
        wx.EVT_SIZE(self, self.OnSize)
        wx.EVT_IDLE(self, self.OnIdle)

    def __del__(self):
        wxWindow.__del__(self)
        ViewPort.__del__(self)

    def PanTool(self):
        """Start the canvas pan tool"""
        self.SelectTool(CanvasPanTool(self))
        
    def SetMap(self, map):
        redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
                           LAYER_VISIBILITY_CHANGED)
        if self.Map() is not None:
            for channel in redraw_channels:
                self.Map().Unsubscribe(channel, self.full_redraw)

        ViewPort.SetMap(self, map)

        if self.Map() is not None:
            for channel in redraw_channels:
                self.Map().Subscribe(channel, self.full_redraw)

        # force a redraw. If map is not empty, it's already been called
        # by FitMapToWindow but if map is empty it hasn't been called
        # yet so we have to explicitly call it.
        self.full_redraw()

    def OnPaint(self, event):
        dc = wxPaintDC(self)

        if self.Map() is not None and self.Map().HasLayers():
            if self.bitmap in (None, -1):
                # set the flag that we should redraw the 
                # bitmap in idle time
                self.bitmap = -1
            else:
                # blit the bitmap to the screen
                dc.BeginDrawing()
                dc.DrawBitmap(self.bitmap, 0, 0)
                dc.EndDrawing()
        else:
            # If we've got no map or if the map is empty, simply clear
            # the screen.

            # XXX it's probably possible to get rid of this. The
            # background color of the window is already white and the
            # only thing we may have to do is to call self.Refresh()
            # with a true argument in the right places.
            dc.BeginDrawing()
            dc.SetBackground(self.backgroundColor)
            dc.Clear()
            dc.EndDrawing()

    def OnIdle(self, event):
        """Idle handler. Redraw the bitmap if necessary"""

        if self.bitmap != -1:
            return
        if self.error_on_redraw:
            return

        wxBeginBusyCursor()
        try:
            try:
                self._do_redraw()
            except:
                self.error_on_redraw = True
                raise
        finally:
            wxEndBusyCursor()

    def _do_redraw(self):
        """Called by OnIdle to do the actual redraw.
        """
        width, height = self.GetSizeTuple()

        bitmap = wx.wxEmptyBitmap(width, height)
        dc = wx.wxMemoryDC()
        dc.SelectObject(bitmap)
        dc.BeginDrawing()

        dc.SetBackground(self.backgroundColor)
        dc.Clear()

        selected_layer = self.selection.SelectedLayer()
        selected_shapes = self.selection.SelectedShapes()

        # draw the map into the bitmap
        renderer = ScreenRenderer(dc, self.scale, self.offset)

        # Pass the entire bitmap as update region to the renderer.
        # We're redrawing the whole bitmap, after all.
        renderer.RenderMap(self.Map(), (0, 0, width, height),
                           selected_layer, selected_shapes)

        dc.EndDrawing()
        dc.SelectObject(wx.wxNullBitmap)

        self.bitmap = bitmap
        # This causes a paint event that then draws the bitmap
        self.redraw()

    def Export(self):

        if hasattr(self, "export_path"):
            export_path = self.export_path
        else:
            export_path="."
        dlg = wxFileDialog(self, _("Export Map"), export_path, "", 
                           "Enhanced Metafile (*.wmf)|*.wmf", 
                           wxSAVE|wxOVERWRITE_PROMPT)
        if dlg.ShowModal() == wxID_OK:
            self.export_path = os.path.dirname(dlg.GetPath())
            dc = wxMetaFileDC(dlg.GetPath())
    
            scale, offset, mapregion = output_transform(self.scale,
                                                        self.offset,
                                                        self.GetSizeTuple(),
                                                        dc.GetSizeTuple())

            selected_layer = self.selection.SelectedLayer()
            selected_shapes = self.selection.SelectedShapes()

            renderer = ExportRenderer(dc, scale, offset)

            # Pass the entire bitmap as update region to the renderer.
            # We're redrawing the whole bitmap, after all.
            width, height = self.GetSizeTuple()
            renderer.RenderMap(self.Map(), 
                                (0,0,
                                    (width/self.scale)*scale,
                                    (height/self.scale)*scale),
                                mapregion,
                                selected_layer, selected_shapes)
            dc.EndDrawing()
            dc.Close()
        dlg.Destroy()
        
    def Print(self):
        printer = wx.wxPrinter()
        width, height = self.GetSizeTuple()
        selected_layer = self.selection.SelectedLayer()
        selected_shapes = self.selection.SelectedShapes()
        
        printout = MapPrintout(self, self.Map(), (0, 0, width, height), 
                               selected_layer, selected_shapes)
        printer.Print(self, printout, True)
        printout.Destroy()

    def redraw(self, *args):
        self.Refresh(False)

    def full_redraw(self, *args):
        self.bitmap = None
        self.redraw()

    def map_projection_changed(self, map, old_proj):
        ViewPort.map_projection_changed(self, map, old_proj)
        self.full_redraw()

    def layer_projection_changed(self, *args):
        ViewPort.layer_projection_changed(self, args)
        self.full_redraw()

    def set_view_transform(self, scale, offset):
        ViewPort.set_view_transform(self, scale, offset)
        self.full_redraw()

    def GetPortSizeTuple(self):
        return self.GetSizeTuple()

    def OnLeftDown(self, event):
        self.MouseLeftDown(event)
        if self.tool is not None:
            self.drag_dc = wxClientDC(self)
            self.drag_dc.SetLogicalFunction(wxINVERT)
            self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
            self.tool.Show(self.drag_dc)
            self.CaptureMouse()
            self.dragging = 1

    def OnLeftUp(self, event):
        """Handle EVT_LEFT_UP

        Release the mouse if it was captured, if a tool is active call
        its Hide method and call self.MouseLeftUp.
        """
        # It's important that ReleaseMouse is called before MouseLeftUp.
        # MouseLeftUp may pop up modal dialogs which leads to an
        # effectively frozen X session because the user can only
        # interact with the dialog but the mouse is still grabbed by the
        # canvas.
        if self.dragging:
            if self.HasCapture():
                self.ReleaseMouse()
            try:
                self.tool.Hide(self.drag_dc)
            finally:
                self.drag_dc = None
                self.dragging = 0
        self.MouseLeftUp(event)

    def OnMotion(self, event):
        if self.dragging:
            self.tool.Hide(self.drag_dc)

        self.MouseMove(event)

        if self.dragging:
            self.tool.Show(self.drag_dc)

    def OnLeaveWindow(self, event):
        self.set_current_position(None)

    def OnSize(self, event):
        # the window's size has changed. We have to get a new bitmap. If
        # we want to be clever we could try to get by without throwing
        # everything away. E.g. when the window gets smaller, we could
        # either keep the bitmap or create the new one from the old one.
        # Even when the window becomes larger some parts of the bitmap
        # could be reused.
        self.full_redraw()

    def shape_selected(self, layer, shape):
        """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
        # The selection object takes care that it only issues
        # SHAPES_SELECTED messages when the set of selected shapes has
        # actually changed, so we can do a full redraw unconditionally.
        # FIXME: We should perhaps try to limit the redraw to the are
        # actually covered by the shapes before and after the selection
        # change.
        ViewPort.shape_selected(self, layer, shape)
        self.full_redraw()

    def GetTextExtent(self, text):
        dc = wxClientDC(self)
        font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
        dc.SetFont(font)
        return dc.GetTextExtent(text)

    def LabelShapeAt(self, x, y, text=None):
        """Add or remove a label at window position x, y.

        If there's a label at the given position, remove it. Otherwise
        determine the shape at the position, run the label dialog and
        unless the user cancels the dialog, add a label.
        """
        label_layer = self.map.LabelLayer()
        layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
        if layer is None and shape_index is not None:
            ViewPort.LabelShapeAt(self, x, y)
        elif layer is not None:
            text = labeldialog.run_label_dialog(self,
                                                layer.ShapeStore().Table(),
                                                shape_index)
            ViewPort.LabelShapeAt(self, x, y, text)
1	# Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2	# Authors:
3	# Bernhard Herzog <[email protected]>
4	# Frank Koormann <[email protected]>
5	#
6	# This program is free software under the GPL (>=v2)
7	# Read the file COPYING coming with Thuban for details.
8
9	"""
10	Classes for display of a map and interaction with it
11	"""
12
13	__version__ = "$Revision$"
14
15	from Thuban import _
16
17	import os.path
18
19	from wxPython.wx import wxWindow, \
20	wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
21	EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW, \
22	wxPlatform, wxBeginBusyCursor, wxEndBusyCursor, wxFileDialog, wxSAVE, \
23	wxOVERWRITE_PROMPT, wxID_OK
24
25	# Export related stuff
26	if wxPlatform == '__WXMSW__':
27	from wxPython.wx import wxMetaFileDC
28
29	from wxPython import wx
30
31	from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
32	LAYER_VISIBILITY_CHANGED
33
34	from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
35
36	import labeldialog
37
38	from viewport import ViewPort, PanTool, output_transform
39
40	class CanvasPanTool(PanTool):
41
42	"""The Canvas Pan Tool"""
43
44	def MouseMove(self, event):
45	if self.dragging:
46	PanTool.MouseMove(self, event)
47	sx, sy = self.start
48	x, y = self.current
49	width, height = self.view.GetSizeTuple()
50
51	bitmapdc = wx.wxMemoryDC()
52	bitmapdc.SelectObject(self.view.bitmap)
53
54	dc = self.view.drag_dc
55	dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
56
57	class MapPrintout(wx.wxPrintout):
58
59	"""
60	wxPrintout class for printing Thuban maps
61	"""
62
63	def __init__(self, canvas, map, region, selected_layer, selected_shapes):
64	wx.wxPrintout.__init__(self)
65	self.canvas = canvas
66	self.map = map
67	self.region = region
68	self.selected_layer = selected_layer
69	self.selected_shapes = selected_shapes
70
71	def GetPageInfo(self):
72	return (1, 1, 1, 1)
73
74	def HasPage(self, pagenum):
75	return pagenum == 1
76
77	def OnPrintPage(self, pagenum):
78	if pagenum == 1:
79	self.draw_on_dc(self.GetDC())
80
81	def draw_on_dc(self, dc):
82	width, height = self.GetPageSizePixels()
83	scale, offset, mapregion = output_transform(self.canvas.scale,
84	self.canvas.offset,
85	self.canvas.GetSizeTuple(),
86	self.GetPageSizePixels())
87	resx, resy = self.GetPPIPrinter()
88	renderer = PrinterRenderer(dc, scale, offset, resolution = resy)
89	x, y, width, height = self.region
90	canvas_scale = self.canvas.scale
91	renderer.RenderMap(self.map,
92	(0,0,
93	(width/canvas_scale)*scale,
94	(height/canvas_scale)*scale),
95	mapregion,
96	self.selected_layer, self.selected_shapes)
97	return True
98
99	class MapCanvas(wxWindow, ViewPort):
100
101	"""A widget that displays a map and offers some interaction"""
102
103	def __init__(self, parent, winid):
104	wxWindow.__init__(self, parent, winid)
105	ViewPort.__init__(self)
106
107	self.SetBackgroundColour(wxColour(255, 255, 255))
108
109	# the bitmap serving as backing store
110	self.bitmap = None
111
112	self.backgroundColor = wx.wxWHITE_BRUSH
113
114	# Set to true if there ever is an error during redraw. There
115	# should never be errors, but unfortunately bugs happen.
116	self.error_on_redraw = 0
117
118	# subscribe the WX events we're interested in
119	EVT_PAINT(self, self.OnPaint)
120	EVT_LEFT_DOWN(self, self.OnLeftDown)
121	EVT_LEFT_UP(self, self.OnLeftUp)
122	EVT_MOTION(self, self.OnMotion)
123	EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
124	wx.EVT_SIZE(self, self.OnSize)
125	wx.EVT_IDLE(self, self.OnIdle)
126
127	def __del__(self):
128	wxWindow.__del__(self)
129	ViewPort.__del__(self)
130
131	def PanTool(self):
132	"""Start the canvas pan tool"""
133	self.SelectTool(CanvasPanTool(self))
134
135	def SetMap(self, map):
136	redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
137	LAYER_VISIBILITY_CHANGED)
138	if self.Map() is not None:
139	for channel in redraw_channels:
140	self.Map().Unsubscribe(channel, self.full_redraw)
141
142	ViewPort.SetMap(self, map)
143
144	if self.Map() is not None:
145	for channel in redraw_channels:
146	self.Map().Subscribe(channel, self.full_redraw)
147
148	# force a redraw. If map is not empty, it's already been called
149	# by FitMapToWindow but if map is empty it hasn't been called
150	# yet so we have to explicitly call it.
151	self.full_redraw()
152
153	def OnPaint(self, event):
154	dc = wxPaintDC(self)
155
156	if self.Map() is not None and self.Map().HasLayers():
157	if self.bitmap in (None, -1):
158	# set the flag that we should redraw the
159	# bitmap in idle time
160	self.bitmap = -1
161	else:
162	# blit the bitmap to the screen
163	dc.BeginDrawing()
164	dc.DrawBitmap(self.bitmap, 0, 0)
165	dc.EndDrawing()
166	else:
167	# If we've got no map or if the map is empty, simply clear
168	# the screen.
169
170	# XXX it's probably possible to get rid of this. The
171	# background color of the window is already white and the
172	# only thing we may have to do is to call self.Refresh()
173	# with a true argument in the right places.
174	dc.BeginDrawing()
175	dc.SetBackground(self.backgroundColor)
176	dc.Clear()
177	dc.EndDrawing()
178
179	def OnIdle(self, event):
180	"""Idle handler. Redraw the bitmap if necessary"""
181
182	if self.bitmap != -1:
183	return
184	if self.error_on_redraw:
185	return
186
187	wxBeginBusyCursor()
188	try:
189	try:
190	self._do_redraw()
191	except:
192	self.error_on_redraw = True
193	raise
194	finally:
195	wxEndBusyCursor()
196
197	def _do_redraw(self):
198	"""Called by OnIdle to do the actual redraw.
199	"""
200	width, height = self.GetSizeTuple()
201
202	bitmap = wx.wxEmptyBitmap(width, height)
203	dc = wx.wxMemoryDC()
204	dc.SelectObject(bitmap)
205	dc.BeginDrawing()
206
207	dc.SetBackground(self.backgroundColor)
208	dc.Clear()
209
210	selected_layer = self.selection.SelectedLayer()
211	selected_shapes = self.selection.SelectedShapes()
212
213	# draw the map into the bitmap
214	renderer = ScreenRenderer(dc, self.scale, self.offset)
215
216	# Pass the entire bitmap as update region to the renderer.
217	# We're redrawing the whole bitmap, after all.
218	renderer.RenderMap(self.Map(), (0, 0, width, height),
219	selected_layer, selected_shapes)
220
221	dc.EndDrawing()
222	dc.SelectObject(wx.wxNullBitmap)
223
224	self.bitmap = bitmap
225	# This causes a paint event that then draws the bitmap
226	self.redraw()
227
228	def Export(self):
229
230	if hasattr(self, "export_path"):
231	export_path = self.export_path
232	else:
233	export_path="."
234	dlg = wxFileDialog(self, _("Export Map"), export_path, "",
235	"Enhanced Metafile (.wmf)\|.wmf",
236	wxSAVE\|wxOVERWRITE_PROMPT)
237	if dlg.ShowModal() == wxID_OK:
238	self.export_path = os.path.dirname(dlg.GetPath())
239	dc = wxMetaFileDC(dlg.GetPath())
240
241	scale, offset, mapregion = output_transform(self.scale,
242	self.offset,
243	self.GetSizeTuple(),
244	dc.GetSizeTuple())
245
246	selected_layer = self.selection.SelectedLayer()
247	selected_shapes = self.selection.SelectedShapes()
248
249	renderer = ExportRenderer(dc, scale, offset)
250
251	# Pass the entire bitmap as update region to the renderer.
252	# We're redrawing the whole bitmap, after all.
253	width, height = self.GetSizeTuple()
254	renderer.RenderMap(self.Map(),
255	(0,0,
256	(width/self.scale)*scale,
257	(height/self.scale)*scale),
258	mapregion,
259	selected_layer, selected_shapes)
260	dc.EndDrawing()
261	dc.Close()
262	dlg.Destroy()
263
264	def Print(self):
265	printer = wx.wxPrinter()
266	width, height = self.GetSizeTuple()
267	selected_layer = self.selection.SelectedLayer()
268	selected_shapes = self.selection.SelectedShapes()
269
270	printout = MapPrintout(self, self.Map(), (0, 0, width, height),
271	selected_layer, selected_shapes)
272	printer.Print(self, printout, True)
273	printout.Destroy()
274
275	def redraw(self, *args):
276	self.Refresh(False)
277
278	def full_redraw(self, *args):
279	self.bitmap = None
280	self.redraw()
281
282	def map_projection_changed(self, map, old_proj):
283	ViewPort.map_projection_changed(self, map, old_proj)
284	self.full_redraw()
285
286	def layer_projection_changed(self, *args):
287	ViewPort.layer_projection_changed(self, args)
288	self.full_redraw()
289
290	def set_view_transform(self, scale, offset):
291	ViewPort.set_view_transform(self, scale, offset)
292	self.full_redraw()
293
294	def GetPortSizeTuple(self):
295	return self.GetSizeTuple()
296
297	def OnLeftDown(self, event):
298	self.MouseLeftDown(event)
299	if self.tool is not None:
300	self.drag_dc = wxClientDC(self)
301	self.drag_dc.SetLogicalFunction(wxINVERT)
302	self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
303	self.tool.Show(self.drag_dc)
304	self.CaptureMouse()
305	self.dragging = 1
306
307	def OnLeftUp(self, event):
308	"""Handle EVT_LEFT_UP
309
310	Release the mouse if it was captured, if a tool is active call
311	its Hide method and call self.MouseLeftUp.
312	"""
313	# It's important that ReleaseMouse is called before MouseLeftUp.
314	# MouseLeftUp may pop up modal dialogs which leads to an
315	# effectively frozen X session because the user can only
316	# interact with the dialog but the mouse is still grabbed by the
317	# canvas.
318	if self.dragging:
319	if self.HasCapture():
320	self.ReleaseMouse()
321	try:
322	self.tool.Hide(self.drag_dc)
323	finally:
324	self.drag_dc = None
325	self.dragging = 0
326	self.MouseLeftUp(event)
327
328	def OnMotion(self, event):
329	if self.dragging:
330	self.tool.Hide(self.drag_dc)
331
332	self.MouseMove(event)
333
334	if self.dragging:
335	self.tool.Show(self.drag_dc)
336
337	def OnLeaveWindow(self, event):
338	self.set_current_position(None)
339
340	def OnSize(self, event):
341	# the window's size has changed. We have to get a new bitmap. If
342	# we want to be clever we could try to get by without throwing
343	# everything away. E.g. when the window gets smaller, we could
344	# either keep the bitmap or create the new one from the old one.
345	# Even when the window becomes larger some parts of the bitmap
346	# could be reused.
347	self.full_redraw()
348
349	def shape_selected(self, layer, shape):
350	"""Receiver for the SHAPES_SELECTED messages. Redraw the map."""
351	# The selection object takes care that it only issues
352	# SHAPES_SELECTED messages when the set of selected shapes has
353	# actually changed, so we can do a full redraw unconditionally.
354	# FIXME: We should perhaps try to limit the redraw to the are
355	# actually covered by the shapes before and after the selection
356	# change.
357	ViewPort.shape_selected(self, layer, shape)
358	self.full_redraw()
359
360	def GetTextExtent(self, text):
361	dc = wxClientDC(self)
362	font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
363	dc.SetFont(font)
364	return dc.GetTextExtent(text)
365
366	def LabelShapeAt(self, x, y, text=None):
367	"""Add or remove a label at window position x, y.
368
369	If there's a label at the given position, remove it. Otherwise
370	determine the shape at the position, run the label dialog and
371	unless the user cancels the dialog, add a label.
372	"""
373	label_layer = self.map.LabelLayer()
374	layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
375	if layer is None and shape_index is not None:
376	ViewPort.LabelShapeAt(self, x, y)
377	elif layer is not None:
378	text = labeldialog.run_label_dialog(self,
379	layer.ShapeStore().Table(),
380	shape_index)
381	ViewPort.LabelShapeAt(self, x, y, text)
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