/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 1456 by bh, Fri Jul 18 14:56:13 2003 UTC revision 2068 by bh, Mon Feb 16 19:42:04 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 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]>  # Frank Koormann <[email protected]>
# Line 10  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  __version__ = "$Revision$"  from __future__ import generators
14    
15  from Thuban import _  __version__ = "$Revision$"
16    # $Source$
17    # $Id$
18    
19  import os.path  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,\
# Line 28  if wxPlatform == '__WXMSW__': Line 32  if wxPlatform == '__WXMSW__':
32    
33  from wxPython import wx  from wxPython import wx
34    
35    from Thuban import _
36    
37  from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \  from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
38       LAYER_VISIBILITY_CHANGED       LAYER_VISIBILITY_CHANGED
39    
# Line 49  class CanvasPanTool(PanTool): Line 55  class CanvasPanTool(PanTool):
55              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
56    
57              bitmapdc = wx.wxMemoryDC()              bitmapdc = wx.wxMemoryDC()
58              bitmapdc.SelectObject(self.view.bitmap)              bitmapdc.SelectObject(self.view.PreviewBitmap())
59    
60              dc = self.view.drag_dc              dc = self.view.drag_dc
61              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
# Line 85  class MapPrintout(wx.wxPrintout): Line 91  class MapPrintout(wx.wxPrintout):
91                                                      self.canvas.GetSizeTuple(),                                                      self.canvas.GetSizeTuple(),
92                                                      self.GetPageSizePixels())                                                      self.GetPageSizePixels())
93          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
         renderer = PrinterRenderer(dc, scale, offset, resolution = resy)  
         x, y, width, height = self.region  
94          canvas_scale = self.canvas.scale          canvas_scale = self.canvas.scale
95          renderer.RenderMap(self.map,          x, y, width, height = self.region
96                             (0,0,          renderer = PrinterRenderer(dc, self.map, scale, offset,
97                                  (width/canvas_scale)*scale,                                     region = (0, 0,
98                                  (height/canvas_scale)*scale),                                               (width/canvas_scale)*scale,
99                                  mapregion,                                               (height/canvas_scale)*scale),
100                             self.selected_layer, self.selected_shapes)                                     resolution = resy,
101                                       destination_region = mapregion)
102            renderer.RenderMap(self.selected_layer, self.selected_shapes)
103          return True          return True
104    
105    
106  class MapCanvas(wxWindow, ViewPort):  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"""
# Line 108  class MapCanvas(wxWindow, ViewPort): Line 115  class MapCanvas(wxWindow, ViewPort):
115    
116          # the bitmap serving as backing store          # the bitmap serving as backing store
117          self.bitmap = None          self.bitmap = None
118            # the monochrome bitmap with the selection if any
119            self.selection_bitmap = None
120    
121          self.backgroundColor = wx.wxWHITE_BRUSH          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          # 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)
# Line 124  class MapCanvas(wxWindow, ViewPort): Line 137  class MapCanvas(wxWindow, ViewPort):
137          wxWindow.__del__(self)          wxWindow.__del__(self)
138          ViewPort.__del__(self)          ViewPort.__del__(self)
139    
140        def PreviewBitmap(self):
141            return self.bitmap
142    
143      def PanTool(self):      def PanTool(self):
144          """Start the canvas pan tool"""          """Start the canvas pan tool"""
145          self.SelectTool(CanvasPanTool(self))          self.SelectTool(CanvasPanTool(self))
# Line 148  class MapCanvas(wxWindow, ViewPort): Line 164  class MapCanvas(wxWindow, ViewPort):
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              if self.bitmap in (None, -1):              if self.bitmap is not None:
                 # set the flag that we should redraw the  
                 # bitmap in idle time  
                 self.bitmap = -1  
             else:  
                 # blit the bitmap to the screen  
169                  dc.BeginDrawing()                  dc.BeginDrawing()
170                  dc.DrawBitmap(self.bitmap, 0, 0)                  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()                  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
# Line 173  class MapCanvas(wxWindow, ViewPort): Line 185  class MapCanvas(wxWindow, ViewPort):
185              dc.EndDrawing()              dc.EndDrawing()
186    
187      def OnIdle(self, event):      def OnIdle(self, event):
188          # render the screen if necessary          """Idle handler. Redraw the bitmap if necessary"""
189            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          if self.bitmap != -1:      def _render_iterator(self):
238              return          width, height = self.GetSizeTuple()
239            dc = wx.wxMemoryDC()
240    
241          wxBeginBusyCursor()          render_start = time.time()
         try:  
             width, height = self.GetSizeTuple()  
242    
243              bitmap = wx.wxEmptyBitmap(width, height)          if self.bitmap is None:
244              dc = wx.wxMemoryDC()              self.bitmap = wx.wxEmptyBitmap(width, height)
245              dc.SelectObject(bitmap)              dc.SelectObject(self.bitmap)
246              dc.BeginDrawing()              dc.BeginDrawing()
247    
248              dc.SetBackground(self.backgroundColor)              dc.SetBackground(self.backgroundColor)
249              dc.Clear()              dc.Clear()
250    
             selected_layer = self.selection.SelectedLayer()  
             selected_shapes = self.selection.SelectedShapes()  
   
251              # draw the map into the bitmap              # draw the map into the bitmap
252              renderer = ScreenRenderer(dc, self.scale, self.offset)              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              # Pass the entire bitmap as update region to the renderer.              dc.EndDrawing()
258              # We're redrawing the whole bitmap, after all.              dc.SelectObject(wx.wxNullBitmap)
259              renderer.RenderMap(self.Map(), (0, 0, width, height),  
260                                 selected_layer, selected_shapes)          if self.HasSelectedShapes() and self.selection_bitmap is None:
261                bitmap = wx.wxEmptyBitmap(width, height)
262                dc.SelectObject(bitmap)
263                dc.BeginDrawing()
264                dc.SetBackground(wx.wxWHITE_BRUSH)
265                dc.Clear()
266    
267                renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
268                                          (0, 0, width, height))
269                layer = self.SelectedLayer()
270                shapes = self.selection.SelectedShapes()
271                for cont in renderer.draw_selection_incrementally(layer, shapes):
272                    yield True
273    
274              dc.EndDrawing()              dc.EndDrawing()
275              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
276    
277              self.bitmap = bitmap              bitmap.SetMask(wx.wxMaskColour(bitmap, wx.wxWHITE))
278          finally:              self.selection_bitmap = bitmap
             wxEndBusyCursor()  
             pass  
279    
280          # This causes a paint event that then draws the bitmap          yield False
         self.redraw()  
281    
282      def Export(self):      def Export(self):
283    
# Line 233  class MapCanvas(wxWindow, ViewPort): Line 300  class MapCanvas(wxWindow, ViewPort):
300              selected_layer = self.selection.SelectedLayer()              selected_layer = self.selection.SelectedLayer()
301              selected_shapes = self.selection.SelectedShapes()              selected_shapes = self.selection.SelectedShapes()
302    
             renderer = ExportRenderer(dc, scale, offset)  
   
             # Pass the entire bitmap as update region to the renderer.  
             # We're redrawing the whole bitmap, after all.  
303              width, height = self.GetSizeTuple()              width, height = self.GetSizeTuple()
304              renderer.RenderMap(self.Map(),              renderer = ExportRenderer(dc, self.Map(), scale, offset,
305                                  (0,0,                                        region = (0, 0,
306                                      (width/self.scale)*scale,                                                  (width/self.scale)*scale,
307                                      (height/self.scale)*scale),                                                  (height/self.scale)*scale),
308                                  mapregion,                                        destination_region = mapregion)
309                                  selected_layer, selected_shapes)              renderer.RenderMap(selected_layer, selected_shapes)
310    
311              dc.EndDrawing()              dc.EndDrawing()
312              dc.Close()              dc.Close()
313          dlg.Destroy()          dlg.Destroy()
# Line 264  class MapCanvas(wxWindow, ViewPort): Line 328  class MapCanvas(wxWindow, ViewPort):
328    
329      def full_redraw(self, *args):      def full_redraw(self, *args):
330          self.bitmap = None          self.bitmap = None
331            self.selection_bitmap = None
332            self.render_iter = None
333            self.redraw()
334    
335        def redraw_selection(self, *args):
336            self.selection_bitmap = None
337            self.render_iter = None
338          self.redraw()          self.redraw()
339    
340      def map_projection_changed(self, map, old_proj):      def map_projection_changed(self, map, old_proj):
# Line 288  class MapCanvas(wxWindow, ViewPort): Line 359  class MapCanvas(wxWindow, ViewPort):
359              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wxINVERT)
360              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
361              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
362                self.CaptureMouse()
363              self.dragging = 1              self.dragging = 1
364    
365      def OnLeftUp(self, event):      def OnLeftUp(self, event):
366          self.MouseLeftUp(event)          """Handle EVT_LEFT_UP
367    
368            Release the mouse if it was captured, if a tool is active call
369            its Hide method and call self.MouseLeftUp.
370            """
371            # It's important that ReleaseMouse is called before MouseLeftUp.
372            # MouseLeftUp may pop up modal dialogs which leads to an
373            # effectively frozen X session because the user can only
374            # interact with the dialog but the mouse is still grabbed by the
375            # canvas.
376          if self.dragging:          if self.dragging:
377              self.ReleaseMouse()              if self.HasCapture():
378                    self.ReleaseMouse()
379              try:              try:
380                  self.tool.Hide(self.drag_dc)                  self.tool.Hide(self.drag_dc)
381              finally:              finally:
382                  self.drag_dc = None                  self.drag_dc = None
383                  self.dragging = 0                  self.dragging = 0
384            self.MouseLeftUp(event)
385    
386      def OnMotion(self, event):      def OnMotion(self, event):
387          if self.dragging:          if self.dragging:
# Line 325  class MapCanvas(wxWindow, ViewPort): Line 408  class MapCanvas(wxWindow, ViewPort):
408          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
409          # The selection object takes care that it only issues          # The selection object takes care that it only issues
410          # SHAPES_SELECTED messages when the set of selected shapes has          # SHAPES_SELECTED messages when the set of selected shapes has
411          # actually changed, so we can do a full redraw unconditionally.          # actually changed, so we can do a full redraw of the
412          # FIXME: We should perhaps try to limit the redraw to the are          # selection_bitmap unconditionally.
         # actually covered by the shapes before and after the selection  
         # change.  
413          ViewPort.shape_selected(self, layer, shape)          ViewPort.shape_selected(self, layer, shape)
414          self.full_redraw()          self.redraw_selection()
415    
416      def GetTextExtent(self, text):      def GetTextExtent(self, text):
417          dc = wxClientDC(self)          dc = wxClientDC(self)
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