/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 60 by bh, Thu Sep 13 14:47:39 2001 UTC revision 2066 by bh, Mon Feb 16 19:39:28 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003, 2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Frank Koormann <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 9  Line 10 
10  Classes for display of a map and interaction with it  Classes for display of a map and interaction with it
11  """  """
12    
13    from __future__ import generators
14    
15  __version__ = "$Revision$"  __version__ = "$Revision$"
16    # $Source$
17    # $Id$
18    
19  from math import hypot  import os.path
20    import time
21    import traceback
22    
23  from wxPython.wx import wxWindow,\  from wxPython.wx import wxWindow, \
24       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
25       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW, \
26         wxPlatform, wxBeginBusyCursor, wxEndBusyCursor, wxFileDialog, wxSAVE, \
27         wxOVERWRITE_PROMPT, wxID_OK
28    
29    # Export related stuff
30    if wxPlatform == '__WXMSW__':
31        from wxPython.wx import wxMetaFileDC
32    
33  from wxPython import wx  from wxPython import wx
34    
35  from wxproj import point_in_polygon_shape, shape_centroid  from Thuban import _
   
36    
37  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
38       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED       LAYER_VISIBILITY_CHANGED
 from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  
      SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT  
39    
40    from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
 from renderer import ScreenRenderer, PrinterRender  
41    
42  import labeldialog  import labeldialog
43    
44  from messages import SELECTED_SHAPE  from viewport import ViewPort, PanTool, output_transform
   
45    
46  #  class CanvasPanTool(PanTool):
 #   The tools  
 #  
   
 class Tool:  
47    
48      """      """The Canvas Pan Tool"""
     Base class for the interactive tools  
     """  
   
     def __init__(self, view):  
         """Intitialize the tool. The view is the canvas displaying the map"""  
         self.view = view  
         self.start = self.current = None  
         self.dragging = 0  
         self.drawn = 0  
   
     def Name(self):  
         """Return the tool's name"""  
         return ''  
   
     def drag_start(self, x, y):  
         self.start = self.current = x, y  
         self.dragging = 1  
   
     def drag_move(self, x, y):  
         self.current = x, y  
   
     def drag_stop(self, x, y):  
         self.current = x, y  
         self.dragging = 0  
   
     def Show(self, dc):  
         if not self.drawn:  
             self.draw(dc)  
         self.drawn = 1  
   
     def Hide(self, dc):  
         if self.drawn:  
             self.draw(dc)  
         self.drawn = 0  
   
     def draw(self, dc):  
         pass  
   
     def MouseDown(self, event):  
         self.drag_start(event.m_x, event.m_y)  
49    
50      def MouseMove(self, event):      def MouseMove(self, event):
51          if self.dragging:          if self.dragging:
52              self.drag_move(event.m_x, event.m_y)              PanTool.MouseMove(self, event)
   
     def MouseUp(self, event):  
         if self.dragging:  
             self.drag_move(event.m_x, event.m_y)  
   
     def Cancel(self):  
         self.dragging = 0  
   
   
 class RectTool(Tool):  
   
     """Base class for tools that draw rectangles while dragging"""  
   
     def draw(self, dc):  
         sx, sy = self.start  
         cx, cy = self.current  
         dc.DrawRectangle(sx, sy, cx - sx, cy - sy)  
   
 class ZoomInTool(RectTool):  
   
     """The Zoom-In Tool"""  
   
     def Name(self):  
         return "ZoomInTool"  
   
     def proj_rect(self):  
         """return the rectangle given by start and current in projected  
         coordinates"""  
         sx, sy = self.start  
         cx, cy = self.current  
         left, top = self.view.win_to_proj(sx, sy)  
         right, bottom = self.view.win_to_proj(cx, cy)  
         return (min(left, right), min(top, bottom),  
                 max(left, right), max(top, bottom))  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
53              sx, sy = self.start              sx, sy = self.start
             cx, cy = self.current  
             if sx == cx and sy == cy:  
                 # Just a mouse click. Simply zoom in by a factor of two  
                 self.view.ZoomFactor(2, center = (cx, cy))  
             else:  
                 # A drag. Zoom in to the rectangle  
                 self.view.FitRectToWindow(self.proj_rect())  
   
   
 class ZoomOutTool(RectTool):  
   
     """The Zoom-Out Tool"""  
       
     def Name(self):  
         return "ZoomOutTool"  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             if sx == cx and sy == cy:  
                 # Just a mouse click. Simply zoom out by a factor of two  
                 self.view.ZoomFactor(0.5, center = (cy, cy))  
             else:  
                 # A drag. Zoom out to the rectangle  
                 self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),  
                                          max(sx, cx), max(sy, cy)))  
   
   
 class PanTool(Tool):  
   
     """The Pan Tool"""  
   
     def Name(self):  
         return "PanTool"  
   
     def MouseMove(self, event):  
         if self.dragging:  
             x0, y0 = self.current  
             Tool.MouseMove(self, event)  
54              x, y = self.current              x, y = self.current
55              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
             dc = self.view.drag_dc  
             dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y)  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             self.view.Translate(cx - sx, cy - sy)  
           
 class IdentifyTool(Tool):  
   
     """The "Identify" Tool"""  
       
     def Name(self):  
         return "IdentifyTool"  
   
     def MouseUp(self, event):  
         self.view.SelectShapeAt(event.m_x, event.m_y)  
   
   
 class LabelTool(Tool):  
   
     """The "Label" Tool"""  
   
     def Name(self):  
         return "LabelTool"  
   
     def MouseUp(self, event):  
         self.view.LabelShapeAt(event.m_x, event.m_y)  
   
56    
57                bitmapdc = wx.wxMemoryDC()
58                bitmapdc.SelectObject(self.view.PreviewBitmap())
59    
60                dc = self.view.drag_dc
61                dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
62    
63  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.wxPrintout):
64    
# Line 211  class MapPrintout(wx.wxPrintout): Line 66  class MapPrintout(wx.wxPrintout):
66      wxPrintout class for printing Thuban maps      wxPrintout class for printing Thuban maps
67      """      """
68    
69      def __init__(self, map):      def __init__(self, canvas, map, region, selected_layer, selected_shapes):
70          wx.wxPrintout.__init__(self)          wx.wxPrintout.__init__(self)
71            self.canvas = canvas
72          self.map = map          self.map = map
73            self.region = region
74            self.selected_layer = selected_layer
75            self.selected_shapes = selected_shapes
76    
77      def GetPageInfo(self):      def GetPageInfo(self):
78          return (1, 1, 1, 1)          return (1, 1, 1, 1)
# Line 227  class MapPrintout(wx.wxPrintout): Line 86  class MapPrintout(wx.wxPrintout):
86    
87      def draw_on_dc(self, dc):      def draw_on_dc(self, dc):
88          width, height = self.GetPageSizePixels()          width, height = self.GetPageSizePixels()
89          llx, lly, urx, ury = self.map.ProjectedBoundingBox()          scale, offset, mapregion = output_transform(self.canvas.scale,
90          scalex = width / (urx - llx)                                                      self.canvas.offset,
91          scaley = height / (ury - lly)                                                      self.canvas.GetSizeTuple(),
92          scale = min(scalex, scaley)                                                      self.GetPageSizePixels())
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
   
93          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
94          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          canvas_scale = self.canvas.scale
95          renderer.RenderMap(self.map)          x, y, width, height = self.region
96          return wx.true          renderer = PrinterRenderer(dc, self.map, scale, offset,
97                                               region = (0, 0,
98                                                 (width/canvas_scale)*scale,
99                                                 (height/canvas_scale)*scale),
100                                       resolution = resy,
101                                       destination_region = mapregion)
102            renderer.RenderMap(self.selected_layer, self.selected_shapes)
103            return True
104    
105  class MapCanvas(wxWindow):  
106    class MapCanvas(wxWindow, ViewPort):
107    
108      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
109    
110      def __init__(self, parent, winid, interactor):      def __init__(self, parent, winid):
111          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
112            ViewPort.__init__(self)
113    
114          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
115          self.map = None  
116          self.scale = 1.0          # the bitmap serving as backing store
117          self.offset = (0, 0)          self.bitmap = None
118          self.dragging = 0          # the monochrome bitmap with the selection if any
119          self.tool = None          self.selection_bitmap = None
120          self.redraw_on_idle = 0  
121            self.backgroundColor = wx.wxWHITE_BRUSH
122    
123            # The rendering iterator object. Used when rendering
124            # incrementally
125            self.render_iter = None
126    
127            # subscribe the WX events we're interested in
128          EVT_PAINT(self, self.OnPaint)          EVT_PAINT(self, self.OnPaint)
129          EVT_LEFT_DOWN(self, self.OnLeftDown)          EVT_LEFT_DOWN(self, self.OnLeftDown)
130          EVT_LEFT_UP(self, self.OnLeftUp)          EVT_LEFT_UP(self, self.OnLeftUp)
131          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
132            EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
133            wx.EVT_SIZE(self, self.OnSize)
134          wx.EVT_IDLE(self, self.OnIdle)          wx.EVT_IDLE(self, self.OnIdle)
135          self.interactor = interactor  
136          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)      def __del__(self):
137            wxWindow.__del__(self)
138            ViewPort.__del__(self)
139    
140        def PreviewBitmap(self):
141            return self.bitmap
142    
143        def PanTool(self):
144            """Start the canvas pan tool"""
145            self.SelectTool(CanvasPanTool(self))
146            
147        def SetMap(self, map):
148            redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
149                               LAYER_VISIBILITY_CHANGED)
150            if self.Map() is not None:
151                for channel in redraw_channels:
152                    self.Map().Unsubscribe(channel, self.full_redraw)
153    
154            ViewPort.SetMap(self, map)
155    
156            if self.Map() is not None:
157                for channel in redraw_channels:
158                    self.Map().Subscribe(channel, self.full_redraw)
159    
160            # force a redraw. If map is not empty, it's already been called
161            # by FitMapToWindow but if map is empty it hasn't been called
162            # yet so we have to explicitly call it.
163            self.full_redraw()
164    
165      def OnPaint(self, event):      def OnPaint(self, event):
166          dc = wxPaintDC(self)          dc = wxPaintDC(self)
167          if self.map is not None and self.map.HasLayers():          if self.Map() is not None and self.Map().HasLayers():
168              # We have a non-empty map. Redraw it in idle time              if self.bitmap is not None:
169              self.redraw_on_idle = 1                  dc.BeginDrawing()
170                    dc.DrawBitmap(self.bitmap, 0, 0)
171                    if self.selection_bitmap is not None:
172                        dc.DrawBitmap(self.selection_bitmap, 0, 0, True)
173                    dc.EndDrawing()
174          else:          else:
175              # If we've got no map or if the map is empty, simply clear              # If we've got no map or if the map is empty, simply clear
176              # the screen.              # the screen.
177                
178              # XXX it's probably possible to get rid of this. The              # XXX it's probably possible to get rid of this. The
179              # background color of the window is already white and the              # background color of the window is already white and the
180              # only thing we may have to do is to call self.Refresh()              # only thing we may have to do is to call self.Refresh()
181              # with a true argument in the right places.              # with a true argument in the right places.
182              dc.BeginDrawing()              dc.BeginDrawing()
183              dc.Clear()                          dc.SetBackground(self.backgroundColor)
184                dc.Clear()
185              dc.EndDrawing()              dc.EndDrawing()
186    
187      def do_redraw(self):      def OnIdle(self, event):
188          # This should only be called if we have a non-empty map. We draw          """Idle handler. Redraw the bitmap if necessary"""
189          # it into a memory DC and then blit it to the screen.          if (self.bitmap is None
190                or self.render_iter is not None
191                or (self.HasSelectedShapes()
192                    and self.selection_bitmap is None)):
193                event.RequestMore(self._do_redraw())
194    
195        def _do_redraw(self):
196            """Redraw a bit and return whether this method has to be called again.
197    
198            Called by OnIdle to handle the actual redraw. Redraw is
199            incremental for both the bitmap with the normal layers and the
200            bitmap with the selection.
201            """
202            finished = False
203            if self.render_iter is not None:
204                try:
205                    if self.render_iter.next():
206                        # Redraw if the last preview redraw was some time
207                        # ago and the user is not currently dragging the
208                        # mouse because redrawing would interfere with what
209                        # the current tool is drawing on the window.
210                        if not self.dragging \
211                               and time.time() - self.render_last_preview > 0.5:
212                            client_dc = wxClientDC(self)
213                            client_dc.BeginDrawing()
214                            client_dc.DrawBitmap(self.bitmap, 0, 0)
215                            client_dc.EndDrawing()
216                            self.render_last_preview = time.time()
217                    else:
218                        self.render_iter = None
219                        # Redraw if not dragging because redrawing would
220                        # interfere with what the current tool is drawing on
221                        # the window.
222                        if not self.dragging:
223                            self.redraw()
224                        finished = True
225                except StopIteration:
226                    finished = True
227                    self.render_iter = None
228                except:
229                    finished = True
230                    self.render_iter = None
231                    traceback.print_exc()
232            else:
233                self.render_iter = self._render_iterator()
234                self.render_last_preview = time.time()
235            return not finished
236    
237        def _render_iterator(self):
238          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
         bitmap = wx.wxEmptyBitmap(width, height)  
239          dc = wx.wxMemoryDC()          dc = wx.wxMemoryDC()
         dc.SelectObject(bitmap)  
         dc.BeginDrawing()  
240    
241          # clear the background          render_start = time.time()
         dc.SetBrush(wx.wxWHITE_BRUSH)  
         dc.SetPen(wx.wxTRANSPARENT_PEN)  
         dc.DrawRectangle(0, 0, width, height)  
   
         if 1: #self.interactor.selected_map is self.map:  
             selected_layer = self.interactor.selected_layer  
             selected_shape = self.interactor.selected_shape  
         else:  
             selected_layer = None  
             selected_shape = None  
242    
243          # draw the map into the bitmap          if self.bitmap is None:
244          renderer = ScreenRenderer(dc, self.scale, self.offset)              self.bitmap = wx.wxEmptyBitmap(width, height)
245          renderer.RenderMap(self.map, selected_layer, selected_shape)              dc.SelectObject(self.bitmap)
246                dc.BeginDrawing()
         dc.EndDrawing()  
   
         # blit the bitmap to the screen  
         clientdc = wxClientDC(self)  
         clientdc.BeginDrawing()  
         clientdc.Blit(0, 0, width, height, dc, 0, 0)  
         clientdc.EndDrawing()  
247    
248      def Print(self):              dc.SetBackground(self.backgroundColor)
249          printer = wx.wxPrinter()              dc.Clear()
         printout = MapPrintout(self.map)  
         printer.Print(self, printout, wx.true)  
         printout.Destroy()  
           
     def SetMap(self, map):  
         redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,  
                            LAYER_VISIBILITY_CHANGED)  
         if self.map is not None:  
             for channel in redraw_channels:  
                 self.map.Unsubscribe(channel, self.redraw)  
             self.map.Unsubscribe(MAP_PROJECTION_CHANGED,  
                                  self.projection_changed)  
         self.map = map  
         if self.map is not None:  
             for channel in redraw_channels:  
                 self.map.Subscribe(channel, self.redraw)  
             self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)  
         self.FitMapToWindow()  
         # 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.redraw()  
250    
251      def Map(self):              # draw the map into the bitmap
252          return self.map              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
253                                          (0, 0, width, height))
254                for cont in renderer.RenderMapIncrementally():
255                    yield True
256    
257      def redraw(self, *args):              dc.EndDrawing()
258          self.Refresh(0)              dc.SelectObject(wx.wxNullBitmap)
259    
260      def projection_changed(self, *args):          if self.HasSelectedShapes() and self.selection_bitmap is None:
261          self.FitMapToWindow()              bitmap = wx.wxEmptyBitmap(width, height)
262          self.redraw()              dc.SelectObject(bitmap)
263                dc.BeginDrawing()
264                dc.SetBackground(wx.wxWHITE_BRUSH)
265                dc.Clear()
266    
267      def set_view_transform(self, scale, offset):              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
268          self.scale = scale                                        (0, 0, width, height))
269          self.offset = offset              layer = self.SelectedLayer()
270          self.redraw()              shapes = self.selection.SelectedShapes()
271                for cont in renderer.draw_selection_incrementally(layer, shapes):
272                    yield True
273    
274      def proj_to_win(self, x, y):              dc.EndDrawing()
275          """\              dc.SelectObject(wx.wxNullBitmap)
         Return the point in  window coords given by projected coordinates x y  
         """  
         offx, offy = self.offset  
         return (self.scale * x + offx, -self.scale * y + offy)  
276    
277      def win_to_proj(self, x, y):              bitmap.SetMask(wx.wxMaskColour(bitmap, wx.wxWHITE))
278          """\              self.selection_bitmap = bitmap
         Return the point in projected coordinates given by window coords x y  
         """  
         offx, offy = self.offset  
         return ((x - offx) / self.scale, (offy - y) / self.scale)  
279    
280      def FitRectToWindow(self, rect):          yield False
         width, height = self.GetSizeTuple()  
         llx, lly, urx, ury = rect  
         if llx == urx or lly == ury:  
             # zero with or zero height. Do Nothing  
             return  
         scalex = width / (urx - llx)  
         scaley = height / (ury - lly)  
         scale = min(scalex, scaley)  
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
         self.set_view_transform(scale, (offx, offy))  
   
     def FitMapToWindow(self):  
         """\  
         Set the scale and offset so that the map is centered in the  
         window  
         """  
         bbox = self.map.ProjectedBoundingBox()  
         if bbox is not None:  
             self.FitRectToWindow(bbox)  
   
     def ZoomFactor(self, factor, center = None):  
         """Multiply the zoom by factor and center on center.  
   
         The optional parameter center is a point in window coordinates  
         that should be centered. If it is omitted, it defaults to the  
         center of the window  
         """  
         width, height = self.GetSizeTuple()  
         scale = self.scale * factor  
         offx, offy = self.offset  
         if center is not None:  
             cx, cy = center  
         else:  
             cx = width / 2  
             cy = height / 2  
         offset = (factor * (offx - cx) + width / 2,  
                   factor * (offy - cy) + height / 2)  
         self.set_view_transform(scale, offset)  
281    
282      def ZoomOutToRect(self, rect):      def Export(self):
         # rect is given in window coordinates  
283    
284          # determine the bbox of the displayed region in projected          if hasattr(self, "export_path"):
285          # coordinates              export_path = self.export_path
286          width, height = self.GetSizeTuple()          else:
287          llx, lly = self.win_to_proj(0, height - 1)              export_path="."
288          urx, ury = self.win_to_proj(width - 1, 0)          dlg = wxFileDialog(self, _("Export Map"), export_path, "",
289                               "Enhanced Metafile (*.wmf)|*.wmf",
290                               wxSAVE|wxOVERWRITE_PROMPT)
291            if dlg.ShowModal() == wxID_OK:
292                self.export_path = os.path.dirname(dlg.GetPath())
293                dc = wxMetaFileDC(dlg.GetPath())
294        
295                scale, offset, mapregion = output_transform(self.scale,
296                                                            self.offset,
297                                                            self.GetSizeTuple(),
298                                                            dc.GetSizeTuple())
299    
300                selected_layer = self.selection.SelectedLayer()
301                selected_shapes = self.selection.SelectedShapes()
302    
303                width, height = self.GetSizeTuple()
304                renderer = ExportRenderer(dc, self.Map(), scale, offset,
305                                          region = (0, 0,
306                                                    (width/self.scale)*scale,
307                                                    (height/self.scale)*scale),
308                                          destination_region = mapregion)
309                renderer.RenderMap(selected_layer, selected_shapes)
310                renderer.RenderMap(selected_layer, selected_shapes)
311    
312          sx, sy, ex, ey = rect              dc.EndDrawing()
313          scalex = (ex - sx) / (urx - llx)              dc.Close()
314          scaley = (ey - sy) / (ury - lly)          dlg.Destroy()
315          scale = min(scalex, scaley)          
316        def Print(self):
317          offx = 0.5 * ((ex + sx) - (urx + llx) * scale)          printer = wx.wxPrinter()
318          offy = 0.5 * ((ey + sy) + (ury + lly) * scale)          width, height = self.GetSizeTuple()
319          self.set_view_transform(scale, (offx, offy))          selected_layer = self.selection.SelectedLayer()
320            selected_shapes = self.selection.SelectedShapes()
321      def Translate(self, dx, dy):          
322          offx, offy = self.offset          printout = MapPrintout(self, self.Map(), (0, 0, width, height),
323          self.set_view_transform(self.scale, (offx + dx, offy + dy))                                 selected_layer, selected_shapes)
324            printer.Print(self, printout, True)
325            printout.Destroy()
326    
327      def ZoomInTool(self):      def redraw(self, *args):
328          self.tool = ZoomInTool(self)          self.Refresh(False)
329    
330      def ZoomOutTool(self):      def full_redraw(self, *args):
331          self.tool = ZoomOutTool(self)          self.bitmap = None
332            self.selection_bitmap = None
333            self.render_iter = None
334            self.redraw()
335    
336      def PanTool(self):      def redraw_selection(self, *args):
337          self.tool = PanTool(self)          self.selection_bitmap = None
338            self.render_iter = None
339            self.redraw()
340    
341      def IdentifyTool(self):      def map_projection_changed(self, map, old_proj):
342          self.tool = IdentifyTool(self)          ViewPort.map_projection_changed(self, map, old_proj)
343            self.full_redraw()
344    
345        def layer_projection_changed(self, *args):
346            ViewPort.layer_projection_changed(self, args)
347            self.full_redraw()
348    
349      def LabelTool(self):      def set_view_transform(self, scale, offset):
350          self.tool = LabelTool(self)          ViewPort.set_view_transform(self, scale, offset)
351            self.full_redraw()
352    
353      def CurrentTool(self):      def GetPortSizeTuple(self):
354          return self.tool and self.tool.Name() or None          return self.GetSizeTuple()
355    
356      def OnLeftDown(self, event):      def OnLeftDown(self, event):
357            self.MouseLeftDown(event)
358          if self.tool is not None:          if self.tool is not None:
359              self.drag_dc = wxClientDC(self)              self.drag_dc = wxClientDC(self)
360              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wxINVERT)
361              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
             self.CaptureMouse()  
             self.tool.MouseDown(event)  
362              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
363                self.CaptureMouse()
364              self.dragging = 1              self.dragging = 1
365            
366      def OnLeftUp(self, event):      def OnLeftUp(self, event):
367          self.ReleaseMouse()          """Handle EVT_LEFT_UP
368    
369            Release the mouse if it was captured, if a tool is active call
370            its Hide method and call self.MouseLeftUp.
371            """
372            # It's important that ReleaseMouse is called before MouseLeftUp.
373            # MouseLeftUp may pop up modal dialogs which leads to an
374            # effectively frozen X session because the user can only
375            # interact with the dialog but the mouse is still grabbed by the
376            # canvas.
377          if self.dragging:          if self.dragging:
378              self.tool.Hide(self.drag_dc)              if self.HasCapture():
379              self.tool.MouseUp(event)                  self.ReleaseMouse()
380              self.drag_dc = None              try:
381          self.dragging = 0                  self.tool.Hide(self.drag_dc)
382                finally:
383                    self.drag_dc = None
384                    self.dragging = 0
385            self.MouseLeftUp(event)
386    
387      def OnMotion(self, event):      def OnMotion(self, event):
388          if self.dragging:          if self.dragging:
389              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
             self.tool.MouseMove(event)  
             self.tool.Show(self.drag_dc)  
   
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
390    
391      def shape_selected(self, layer, shape):          self.MouseMove(event)
         self.redraw()  
392    
393      def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):          if self.dragging:
394          """Determine the shape at point px, py in window coords              self.tool.Show(self.drag_dc)
395    
396          Return the shape and the corresponding layer as a tuple (layer,      def OnLeaveWindow(self, event):
397          shape).          self.set_current_position(None)
398    
399          If the optional parameter select_labels is true (default false)      def OnSize(self, event):
400          search through the labels. If a label is found return it's index          # the window's size has changed. We have to get a new bitmap. If
401          as the shape and None as the layer.          # we want to be clever we could try to get by without throwing
402            # everything away. E.g. when the window gets smaller, we could
403            # either keep the bitmap or create the new one from the old one.
404            # Even when the window becomes larger some parts of the bitmap
405            # could be reused.
406            self.full_redraw()
407    
408          If the optional parameter selected_layer is true (default), only      def shape_selected(self, layer, shape):
409          search in the currently selected layer.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
410            # The selection object takes care that it only issues
411            # SHAPES_SELECTED messages when the set of selected shapes has
412            # actually changed, so we can do a full redraw of the
413            # selection_bitmap unconditionally.
414            ViewPort.shape_selected(self, layer, shape)
415            self.redraw_selection()
416    
417        def GetTextExtent(self, text):
418            dc = wxClientDC(self)
419            font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
420            dc.SetFont(font)
421            return dc.GetTextExtent(text)
422    
423        def LabelShapeAt(self, x, y, text=None):
424            """Add or remove a label at window position x, y.
425    
426            If there's a label at the given position, remove it. Otherwise
427            determine the shape at the position, run the label dialog and
428            unless the user cancels the dialog, add a label.
429          """          """
         map_proj = self.map.projection  
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
   
         scale = self.scale  
         offx, offy = self.offset  
   
         if select_labels:  
             labels = self.map.LabelLayer().Labels()  
               
             if labels:  
                 dc = wxClientDC(self)  
                 font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)  
                 dc.SetFont(font)  
                 for i in range(len(labels) - 1, -1, -1):  
                     label = labels[i]  
                     x = label.x  
                     y = label.y  
                     text = label.text  
                     if forward:  
                         x, y = forward(x, y)  
                     x = x * scale + offx  
                     y = -y * scale + offy  
                     width, height = dc.GetTextExtent(text)  
                     if label.halign == ALIGN_LEFT:  
                         # nothing to be done  
                         pass  
                     elif label.halign == ALIGN_RIGHT:  
                         x = x - width  
                     elif label.halign == ALIGN_CENTER:  
                         x = x - width/2  
                     if label.valign == ALIGN_TOP:  
                         # nothing to be done  
                         pass  
                     elif label.valign == ALIGN_BOTTOM:  
                         y = y - height  
                     elif label.valign == ALIGN_CENTER:  
                         y = y - height/2  
                     if x <= px < x + width and y <= py <= y + height:  
                         return None, i  
   
         if selected_layer:  
             layer = self.interactor.SelectedLayer()  
             if layer is not None:  
                 layers = [layer]  
             else:  
                 # no layer selected. Use an empty list to effectively  
                 # ignore all layers.  
                 layers = []  
         else:  
             layers = self.map.Layers()  
   
         for layer_index in range(len(layers) - 1, -1, -1):  
             layer = layers[layer_index]  
   
             # search only in visible layers  
             if not layer.Visible():  
                 continue  
   
             filled = layer.fill is not None  
             stroked = layer.stroke is not None  
                   
             layer_proj = layer.projection  
             if layer_proj is not None:  
                 inverse = layer_proj.Inverse  
             else:  
                 inverse = None  
                   
             shapetype = layer.ShapeType()  
   
             select_shape = -1  
             if shapetype == SHAPETYPE_POLYGON:  
                 for i in range(layer.NumShapes() - 1, -1, -1):  
                     result = point_in_polygon_shape(layer.shapefile.cobject(),  
                                                     i,  
                                                     filled, stroked,  
                                                     map_proj, layer_proj,  
                                                     scale, -scale, offx, offy,  
                                                     px, py)  
                     if result:  
                         select_shape = i  
                         break  
             elif shapetype == SHAPETYPE_ARC:  
                 for i in range(layer.NumShapes() - 1, -1, -1):  
                     result = point_in_polygon_shape(layer.shapefile.cobject(),  
                                                     i, 0, 1,  
                                                     map_proj, layer_proj,  
                                                     scale, -scale, offx, offy,  
                                                     px, py)  
                     if result < 0:  
                         select_shape = i  
                         break  
             elif shapetype == SHAPETYPE_POINT:  
                 for i in range(layer.NumShapes() - 1, -1, -1):  
                     shape = layer.Shape(i)  
                     x, y = shape.Points()[0]  
                     if inverse:  
                         x, y = inverse(x, y)  
                     if forward:  
                         x, y = forward(x, y)  
                     x = x * scale + offx  
                     y = -y * scale + offy  
                     if hypot(px - x, py - y) < 5:  
                         select_shape = i  
                         break  
   
             if select_shape >= 0:  
                 return layer, select_shape  
         return None, None  
   
     def SelectShapeAt(self, x, y):  
         layer, shape = self.find_shape_at(x, y)  
         # If layer is None, then shape will also be None. We don't want  
         # to deselect the currently selected layer, so we simply select  
         # the already selected layer again.  
         if layer is None:  
             layer = self.interactor.SelectedLayer()  
         self.interactor.SelectLayerAndShape(layer, shape)  
   
     def LabelShapeAt(self, x, y):  
         ox = x; oy = y  
430          label_layer = self.map.LabelLayer()          label_layer = self.map.LabelLayer()
431          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
432          if layer is None and shape_index is not None:          if layer is None and shape_index is not None:
433              # a label was selected              ViewPort.LabelShapeAt(self, x, y)
             label_layer.RemoveLabel(shape_index)  
434          elif layer is not None:          elif layer is not None:
435              text = labeldialog.run_label_dialog(self, layer.table, shape_index)              text = labeldialog.run_label_dialog(self,
436              if text:                                                  layer.ShapeStore().Table(),
437                  proj = self.map.projection                                                  shape_index)
438                  if proj is not None:              ViewPort.LabelShapeAt(self, x, y, text)
                     map_proj = proj  
                 else:  
                     map_proj = None  
                 proj = layer.projection  
                 if proj is not None:  
                     layer_proj = proj  
                 else:  
                     layer_proj = None  
   
                 shapetype = layer.ShapeType()  
                 if shapetype == SHAPETYPE_POLYGON:  
                     x, y = shape_centroid(layer.shapefile.cobject(),  
                                           shape_index,  
                                           map_proj, layer_proj, 1, 1, 0, 0)  
                     if map_proj is not None:  
                         x, y = map_proj.Inverse(x, y)  
                 else:  
                     shape = layer.Shape(shape_index)  
                     if shapetype == SHAPETYPE_POINT:  
                         x, y = shape.Points()[0]  
                     else:  
                         # assume SHAPETYPE_ARC  
                         points = shape.Points()  
                         x, y = points[len(points) / 2]  
                     if layer_proj is not None:  
                         x, y = layer_proj.Inverse(x, y)  
                 if shapetype == SHAPETYPE_POINT:  
                     halign = ALIGN_LEFT  
                     valign = ALIGN_CENTER  
                 elif shapetype == SHAPETYPE_POLYGON:  
                     halign = ALIGN_CENTER  
                     valign = ALIGN_CENTER  
                 elif shapetype == SHAPETYPE_ARC:  
                     halign = ALIGN_LEFT  
                     valign = ALIGN_CENTER  
                 label_layer.AddLabel(x, y, text,  
                                      halign = halign, valign = valign)  
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