/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 125 by bh, Thu May 2 18:55:33 2002 UTC revision 176 by bh, Wed May 15 13:38:49 2002 UTC
# Line 167  class PanTool(Tool): Line 167  class PanTool(Tool):
167    
168      def MouseMove(self, event):      def MouseMove(self, event):
169          if self.dragging:          if self.dragging:
             x0, y0 = self.current  
170              Tool.MouseMove(self, event)              Tool.MouseMove(self, event)
171                sx, sy = self.start
172              x, y = self.current              x, y = self.current
173              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
174    
175                bitmapdc = wx.wxMemoryDC()
176                bitmapdc.SelectObject(self.view.bitmap)
177    
178              dc = self.view.drag_dc              dc = self.view.drag_dc
179              dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y)              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
180    
181      def MouseUp(self, event):      def MouseUp(self, event):
182          if self.dragging:          if self.dragging:
# Line 267  class MapCanvas(wxWindow, Publisher): Line 271  class MapCanvas(wxWindow, Publisher):
271          # if the mouse is outside the window.          # if the mouse is outside the window.
272          self.current_position = None          self.current_position = None
273    
   
274          # If true, OnIdle will call do_redraw to do the actual          # If true, OnIdle will call do_redraw to do the actual
275          # redrawing. Set by OnPaint to avoid some unnecessary redraws.          # redrawing. Set by OnPaint to avoid some unnecessary redraws.
276          # To force a redraw call full_redraw().          # To force a redraw call full_redraw().
277          self.redraw_on_idle = 0          self.redraw_on_idle = 0
278    
279            # The region to update when idle
280            self.update_region = wx.wxRegion()
281    
282          # the bitmap serving as backing store          # the bitmap serving as backing store
283          self.bitmap = None          self.bitmap = None
284    
# Line 280  class MapCanvas(wxWindow, Publisher): Line 286  class MapCanvas(wxWindow, Publisher):
286          self.interactor = interactor          self.interactor = interactor
287          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)
288    
289            # keep track of which layers/shapes are selected to make sure we
290            # only redraw when necessary
291            self.last_selected_layer = None
292            self.last_selected_shape = None
293    
294          # subscribe the WX events we're interested in          # subscribe the WX events we're interested in
295          EVT_PAINT(self, self.OnPaint)          EVT_PAINT(self, self.OnPaint)
296          EVT_LEFT_DOWN(self, self.OnLeftDown)          EVT_LEFT_DOWN(self, self.OnLeftDown)
# Line 298  class MapCanvas(wxWindow, Publisher): Line 309  class MapCanvas(wxWindow, Publisher):
309          if self.map is not None and self.map.HasLayers():          if self.map is not None and self.map.HasLayers():
310              # We have a non-empty map. Redraw it in idle time              # We have a non-empty map. Redraw it in idle time
311              self.redraw_on_idle = 1              self.redraw_on_idle = 1
312                # update the region that has to be redrawn
313                self.update_region.UnionRegion(self.GetUpdateRegion())
314          else:          else:
315              # 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
316              # the screen.              # the screen.
# Line 310  class MapCanvas(wxWindow, Publisher): Line 323  class MapCanvas(wxWindow, Publisher):
323              dc.Clear()                          dc.Clear()            
324              dc.EndDrawing()              dc.EndDrawing()
325    
326                # clear the region
327                self.update_region = wx.wxRegion()
328    
329      def do_redraw(self):      def do_redraw(self):
330          # 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.
331          # it into a memory DC and then blit it to the screen.  
332            # get the update region and reset it. We're not actually using
333            # it anymore, though.
334            update_box = self.update_region.GetBox()
335            self.update_region = wx.wxRegion()
336    
337            # Get the window size.
338          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
339    
340          # If self.bitmap's still there, reuse it. Otherwise redraw it          # If self.bitmap's still there, reuse it. Otherwise redraw it
# Line 339  class MapCanvas(wxWindow, Publisher): Line 360  class MapCanvas(wxWindow, Publisher):
360    
361              # draw the map into the bitmap              # draw the map into the bitmap
362              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.scale, self.offset)
363              renderer.RenderMap(self.map, selected_layer, selected_shape)  
364                # Pass the entire bitmap as update_region to the renderer.
365                # We're redrawing the whole bitmap, after all.
366                renderer.RenderMap(self.map, (0, 0, width, height),
367                                   selected_layer, selected_shape)
368    
369              dc.EndDrawing()              dc.EndDrawing()
370              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
# Line 562  class MapCanvas(wxWindow, Publisher): Line 587  class MapCanvas(wxWindow, Publisher):
587          self.full_redraw()          self.full_redraw()
588    
589      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
590          self.full_redraw()          """Redraw the map.
591    
592            Receiver for the SELECTED_SHAPE messages. Try to redraw only
593            when necessary.
594            """
595            # A redraw is necessary when the display has to change, which
596            # means that either the status changes from having no selection
597            # to having a selection shape or vice versa, or when the fact
598            # whether there is a selection at all doesn't change, when the
599            # shape which is selected has changed (which means that layer or
600            # shapeid changes).
601            if ((shape is not None or self.last_selected_shape is not None)
602                and (shape != self.last_selected_shape
603                     or layer != self.last_selected_layer)):
604                self.full_redraw()
605    
606            # remember the selection so we can compare when it changes again.
607            self.last_selected_layer = layer
608            self.last_selected_shape = shape
609    
610        def unprojected_rect_around_point(self, x, y):
611            """return a rect a few pixels around (x, y) in unprojected corrdinates
612    
613            The return value is a tuple (minx, miny, maxx, maxy) suitable a
614            parameter to a layer's ShapesInRegion method.
615            """
616            map_proj = self.map.projection
617            if map_proj is not None:
618                inverse = map_proj.Inverse
619            else:
620                inverse = None
621    
622            xs = []
623            ys = []
624            for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):
625                px, py = self.win_to_proj(x + dx, y + dy)
626                if inverse:
627                    px, py = inverse(px, py)
628                xs.append(px)
629                ys.append(py)
630            return (min(xs), min(ys), max(xs), max(ys))
631    
632      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):
633          """Determine the shape at point px, py in window coords          """Determine the shape at point px, py in window coords
# Line 586  class MapCanvas(wxWindow, Publisher): Line 651  class MapCanvas(wxWindow, Publisher):
651          scale = self.scale          scale = self.scale
652          offx, offy = self.offset          offx, offy = self.offset
653    
654            box = self.unprojected_rect_around_point(px, py)
655    
656          if select_labels:          if select_labels:
657              labels = self.map.LabelLayer().Labels()              labels = self.map.LabelLayer().Labels()
658                            
# Line 650  class MapCanvas(wxWindow, Publisher): Line 717  class MapCanvas(wxWindow, Publisher):
717              shapetype = layer.ShapeType()              shapetype = layer.ShapeType()
718    
719              select_shape = -1              select_shape = -1
720    
721                shape_ids = layer.ShapesInRegion(box)
722                shape_ids.reverse()
723    
724              if shapetype == SHAPETYPE_POLYGON:              if shapetype == SHAPETYPE_POLYGON:
725                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
726                      result = point_in_polygon_shape(layer.shapefile.cobject(),                      result = point_in_polygon_shape(layer.shapefile.cobject(),
727                                                      i,                                                      i,
728                                                      filled, stroked,                                                      filled, stroked,
# Line 662  class MapCanvas(wxWindow, Publisher): Line 733  class MapCanvas(wxWindow, Publisher):
733                          select_shape = i                          select_shape = i
734                          break                          break
735              elif shapetype == SHAPETYPE_ARC:              elif shapetype == SHAPETYPE_ARC:
736                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
737                      result = point_in_polygon_shape(layer.shapefile.cobject(),                      result = point_in_polygon_shape(layer.shapefile.cobject(),
738                                                      i, 0, 1,                                                      i, 0, 1,
739                                                      map_proj, layer_proj,                                                      map_proj, layer_proj,
# Line 672  class MapCanvas(wxWindow, Publisher): Line 743  class MapCanvas(wxWindow, Publisher):
743                          select_shape = i                          select_shape = i
744                          break                          break
745              elif shapetype == SHAPETYPE_POINT:              elif shapetype == SHAPETYPE_POINT:
746                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
747                      shape = layer.Shape(i)                      shape = layer.Shape(i)
748                      x, y = shape.Points()[0]                      x, y = shape.Points()[0]
749                      if inverse:                      if inverse:
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