/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 124 by bh, Mon Apr 29 18:04:54 2002 UTC revision 125 by bh, Thu May 2 18:55:33 2002 UTC
# Line 247  class MapCanvas(wxWindow, Publisher): Line 247  class MapCanvas(wxWindow, Publisher):
247      def __init__(self, parent, winid, interactor):      def __init__(self, parent, winid, interactor):
248          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
249          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
250    
251            # the map displayed in this canvas. Set with SetMap()
252          self.map = None          self.map = None
253    
254            # scale and offset describe the transformation from projected
255            # coordinates to window coordinates.
256          self.scale = 1.0          self.scale = 1.0
257          self.offset = (0, 0)          self.offset = (0, 0)
258    
259            # whether the user is currently dragging the mouse, i.e. moving
260            # the mouse while pressing a mouse button
261          self.dragging = 0          self.dragging = 0
262    
263            # the currently active tool
264          self.tool = None          self.tool = None
265          self.redraw_on_idle = 0  
266            # The current mouse position of the last OnMotion event or None
267            # if the mouse is outside the window.
268          self.current_position = None          self.current_position = None
269    
270    
271            # If true, OnIdle will call do_redraw to do the actual
272            # redrawing. Set by OnPaint to avoid some unnecessary redraws.
273            # To force a redraw call full_redraw().
274            self.redraw_on_idle = 0
275    
276            # the bitmap serving as backing store
277            self.bitmap = None
278    
279            # the interactor
280            self.interactor = interactor
281            self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)
282    
283            # subscribe the WX events we're interested in
284          EVT_PAINT(self, self.OnPaint)          EVT_PAINT(self, self.OnPaint)
285          EVT_LEFT_DOWN(self, self.OnLeftDown)          EVT_LEFT_DOWN(self, self.OnLeftDown)
286          EVT_LEFT_UP(self, self.OnLeftUp)          EVT_LEFT_UP(self, self.OnLeftUp)
287          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
288          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
289            wx.EVT_SIZE(self, self.OnSize)
290          wx.EVT_IDLE(self, self.OnIdle)          wx.EVT_IDLE(self, self.OnIdle)
         self.interactor = interactor  
         self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)  
291    
292      def __del__(self):      def __del__(self):
293          wxWindow.__del__(self)          wxWindow.__del__(self)
# Line 287  class MapCanvas(wxWindow, Publisher): Line 313  class MapCanvas(wxWindow, Publisher):
313      def do_redraw(self):      def do_redraw(self):
314          # This should only be called if we have a non-empty map. We draw          # This should only be called if we have a non-empty map. We draw
315          # it into a memory DC and then blit it to the screen.          # it into a memory DC and then blit it to the screen.
316    
317          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
         bitmap = wx.wxEmptyBitmap(width, height)  
         dc = wx.wxMemoryDC()  
         dc.SelectObject(bitmap)  
         dc.BeginDrawing()  
318    
319          # clear the background          # If self.bitmap's still there, reuse it. Otherwise redraw it
320          dc.SetBrush(wx.wxWHITE_BRUSH)          if self.bitmap is not None:
321          dc.SetPen(wx.wxTRANSPARENT_PEN)              bitmap = self.bitmap
         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  
322          else:          else:
323              selected_layer = None              bitmap = wx.wxEmptyBitmap(width, height)
324              selected_shape = None              dc = wx.wxMemoryDC()
325                dc.SelectObject(bitmap)
326                dc.BeginDrawing()
327    
328          # draw the map into the bitmap              # clear the background
329          renderer = ScreenRenderer(dc, self.scale, self.offset)              dc.SetBrush(wx.wxWHITE_BRUSH)
330          renderer.RenderMap(self.map, selected_layer, selected_shape)              dc.SetPen(wx.wxTRANSPARENT_PEN)
331                dc.DrawRectangle(0, 0, width, height)
332    
333                if 1: #self.interactor.selected_map is self.map:
334                    selected_layer = self.interactor.selected_layer
335                    selected_shape = self.interactor.selected_shape
336                else:
337                    selected_layer = None
338                    selected_shape = None
339    
340                # draw the map into the bitmap
341                renderer = ScreenRenderer(dc, self.scale, self.offset)
342                renderer.RenderMap(self.map, selected_layer, selected_shape)
343    
344          dc.EndDrawing()              dc.EndDrawing()
345                dc.SelectObject(wx.wxNullBitmap)
346                self.bitmap = bitmap
347    
348          # blit the bitmap to the screen          # blit the bitmap to the screen
349            dc = wx.wxMemoryDC()
350            dc.SelectObject(bitmap)
351          clientdc = wxClientDC(self)          clientdc = wxClientDC(self)
352          clientdc.BeginDrawing()          clientdc.BeginDrawing()
353          clientdc.Blit(0, 0, width, height, dc, 0, 0)          clientdc.Blit(0, 0, width, height, dc, 0, 0)
# Line 328  class MapCanvas(wxWindow, Publisher): Line 364  class MapCanvas(wxWindow, Publisher):
364                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
365          if self.map is not None:          if self.map is not None:
366              for channel in redraw_channels:              for channel in redraw_channels:
367                  self.map.Unsubscribe(channel, self.redraw)                  self.map.Unsubscribe(channel, self.full_redraw)
368              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
369                                   self.projection_changed)                                   self.projection_changed)
370          self.map = map          self.map = map
371          if self.map is not None:          if self.map is not None:
372              for channel in redraw_channels:              for channel in redraw_channels:
373                  self.map.Subscribe(channel, self.redraw)                  self.map.Subscribe(channel, self.full_redraw)
374              self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)              self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)
375          self.FitMapToWindow()          self.FitMapToWindow()
376          # force a redraw. If map is not empty, it's already been called          # force a redraw. If map is not empty, it's already been called
377          # by FitMapToWindow but if map is empty it hasn't been called          # by FitMapToWindow but if map is empty it hasn't been called
378          # yet so we have to explicitly call it.          # yet so we have to explicitly call it.
379          self.redraw()          self.full_redraw()
380    
381      def Map(self):      def Map(self):
382          return self.map          return self.map
# Line 348  class MapCanvas(wxWindow, Publisher): Line 384  class MapCanvas(wxWindow, Publisher):
384      def redraw(self, *args):      def redraw(self, *args):
385          self.Refresh(0)          self.Refresh(0)
386    
387        def full_redraw(self, *args):
388            self.bitmap = None
389            self.redraw()
390    
391      def projection_changed(self, *args):      def projection_changed(self, *args):
392          self.FitMapToWindow()          self.FitMapToWindow()
393          self.redraw()          self.full_redraw()
394    
395      def set_view_transform(self, scale, offset):      def set_view_transform(self, scale, offset):
396          self.scale = scale          self.scale = scale
397          self.offset = offset          self.offset = offset
398          self.redraw()          self.full_redraw()
399    
400      def proj_to_win(self, x, y):      def proj_to_win(self, x, y):
401          """\          """\
# Line 512  class MapCanvas(wxWindow, Publisher): Line 552  class MapCanvas(wxWindow, Publisher):
552              self.do_redraw()              self.do_redraw()
553          self.redraw_on_idle = 0          self.redraw_on_idle = 0
554    
555        def OnSize(self, event):
556            # the window's size has changed. We have to get a new bitmap. If
557            # we want to be clever we could try to get by without throwing
558            # everything away. E.g. when the window gets smaller, we could
559            # either keep the bitmap or create the new one from the old one.
560            # Even when the window becomes larger some parts of the bitmap
561            # could be reused.
562            self.full_redraw()
563    
564      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
565          self.redraw()          self.full_redraw()
566    
567      def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):      def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):
568          """Determine the shape at point px, py in window coords          """Determine the shape at point px, py in window coords
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