/[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 174 by bh, Wed May 15 13:30:00 2002 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 by Intevation GmbH  # Copyright (c) 2001, 2002 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  #  #
# Line 15  from math import hypot Line 15  from math import hypot
15    
16  from wxPython.wx import wxWindow,\  from wxPython.wx import wxWindow,\
17       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
18       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW
19    
20    
21  from wxPython import wx  from wxPython import wx
# Line 29  from Thuban.Model.layer import SHAPETYPE Line 29  from Thuban.Model.layer import SHAPETYPE
29       SHAPETYPE_POINT       SHAPETYPE_POINT
30  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
31       ALIGN_LEFT, ALIGN_RIGHT       ALIGN_LEFT, ALIGN_RIGHT
32    from Thuban.Lib.connector import Publisher
33    
34  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, PrinterRender
35    
36  import labeldialog  import labeldialog
37    
38  from messages import SELECTED_SHAPE  from messages import SELECTED_SHAPE, VIEW_POSITION
39    
40    
41  #  #
# 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 240  class MapPrintout(wx.wxPrintout): Line 244  class MapPrintout(wx.wxPrintout):
244          return wx.true          return wx.true
245                    
246    
247  class MapCanvas(wxWindow):  class MapCanvas(wxWindow, Publisher):
248    
249      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
250    
251      def __init__(self, parent, winid, interactor):      def __init__(self, parent, winid, interactor):
252          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
253          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
254    
255            # the map displayed in this canvas. Set with SetMap()
256          self.map = None          self.map = None
257    
258            # scale and offset describe the transformation from projected
259            # coordinates to window coordinates.
260          self.scale = 1.0          self.scale = 1.0
261          self.offset = (0, 0)          self.offset = (0, 0)
262    
263            # whether the user is currently dragging the mouse, i.e. moving
264            # the mouse while pressing a mouse button
265          self.dragging = 0          self.dragging = 0
266    
267            # the currently active tool
268          self.tool = None          self.tool = None
269    
270            # The current mouse position of the last OnMotion event or None
271            # if the mouse is outside the window.
272            self.current_position = None
273    
274            # If true, OnIdle will call do_redraw to do the actual
275            # redrawing. Set by OnPaint to avoid some unnecessary redraws.
276            # 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
283            self.bitmap = None
284    
285            # the interactor
286            self.interactor = interactor
287            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
295          EVT_PAINT(self, self.OnPaint)          EVT_PAINT(self, self.OnPaint)
296          EVT_LEFT_DOWN(self, self.OnLeftDown)          EVT_LEFT_DOWN(self, self.OnLeftDown)
297          EVT_LEFT_UP(self, self.OnLeftUp)          EVT_LEFT_UP(self, self.OnLeftUp)
298          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
299            EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
300            wx.EVT_SIZE(self, self.OnSize)
301          wx.EVT_IDLE(self, self.OnIdle)          wx.EVT_IDLE(self, self.OnIdle)
302          self.interactor = interactor  
303          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)      def __del__(self):
304            wxWindow.__del__(self)
305            Publisher.__del__(self)
306    
307      def OnPaint(self, event):      def OnPaint(self, event):
308          dc = wxPaintDC(self)          dc = wxPaintDC(self)
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 278  class MapCanvas(wxWindow): Line 323  class MapCanvas(wxWindow):
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()
         bitmap = wx.wxEmptyBitmap(width, height)  
         dc = wx.wxMemoryDC()  
         dc.SelectObject(bitmap)  
         dc.BeginDrawing()  
339    
340          # clear the background          # If self.bitmap's still there, reuse it. Otherwise redraw it
341          dc.SetBrush(wx.wxWHITE_BRUSH)          if self.bitmap is not None:
342          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  
343          else:          else:
344              selected_layer = None              bitmap = wx.wxEmptyBitmap(width, height)
345              selected_shape = None              dc = wx.wxMemoryDC()
346                dc.SelectObject(bitmap)
347                dc.BeginDrawing()
348    
349                # clear the background
350                dc.SetBrush(wx.wxWHITE_BRUSH)
351                dc.SetPen(wx.wxTRANSPARENT_PEN)
352                dc.DrawRectangle(0, 0, width, height)
353    
354                if 1: #self.interactor.selected_map is self.map:
355                    selected_layer = self.interactor.selected_layer
356                    selected_shape = self.interactor.selected_shape
357                else:
358                    selected_layer = None
359                    selected_shape = None
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)
         renderer.RenderMap(self.map, selected_layer, selected_shape)  
363    
364          dc.EndDrawing()              # 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()
370                dc.SelectObject(wx.wxNullBitmap)
371                self.bitmap = bitmap
372    
373          # blit the bitmap to the screen          # blit the bitmap to the screen
374            dc = wx.wxMemoryDC()
375            dc.SelectObject(bitmap)
376          clientdc = wxClientDC(self)          clientdc = wxClientDC(self)
377          clientdc.BeginDrawing()          clientdc.BeginDrawing()
378          clientdc.Blit(0, 0, width, height, dc, 0, 0)          clientdc.Blit(0, 0, width, height, dc, 0, 0)
# Line 322  class MapCanvas(wxWindow): Line 389  class MapCanvas(wxWindow):
389                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
390          if self.map is not None:          if self.map is not None:
391              for channel in redraw_channels:              for channel in redraw_channels:
392                  self.map.Unsubscribe(channel, self.redraw)                  self.map.Unsubscribe(channel, self.full_redraw)
393              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
394                                   self.projection_changed)                                   self.projection_changed)
395          self.map = map          self.map = map
396          if self.map is not None:          if self.map is not None:
397              for channel in redraw_channels:              for channel in redraw_channels:
398                  self.map.Subscribe(channel, self.redraw)                  self.map.Subscribe(channel, self.full_redraw)
399              self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)              self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)
400          self.FitMapToWindow()          self.FitMapToWindow()
401          # 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
402          # by FitMapToWindow but if map is empty it hasn't been called          # by FitMapToWindow but if map is empty it hasn't been called
403          # yet so we have to explicitly call it.          # yet so we have to explicitly call it.
404          self.redraw()          self.full_redraw()
405    
406      def Map(self):      def Map(self):
407          return self.map          return self.map
# Line 342  class MapCanvas(wxWindow): Line 409  class MapCanvas(wxWindow):
409      def redraw(self, *args):      def redraw(self, *args):
410          self.Refresh(0)          self.Refresh(0)
411    
412        def full_redraw(self, *args):
413            self.bitmap = None
414            self.redraw()
415    
416      def projection_changed(self, *args):      def projection_changed(self, *args):
417          self.FitMapToWindow()          self.FitMapToWindow()
418          self.redraw()          self.full_redraw()
419    
420      def set_view_transform(self, scale, offset):      def set_view_transform(self, scale, offset):
421          self.scale = scale          self.scale = scale
422          self.offset = offset          self.offset = offset
423          self.redraw()          self.full_redraw()
424    
425      def proj_to_win(self, x, y):      def proj_to_win(self, x, y):
426          """\          """\
# Line 446  class MapCanvas(wxWindow): Line 517  class MapCanvas(wxWindow):
517      def CurrentTool(self):      def CurrentTool(self):
518          return self.tool and self.tool.Name() or None          return self.tool and self.tool.Name() or None
519    
520        def CurrentPosition(self):
521            """Return current position of the mouse in projected coordinates.
522    
523            The result is a 2-tuple of floats with the coordinates. If the
524            mouse is not in the window, the result is None.
525            """
526            if self.current_position is not None:
527                x, y = self.current_position
528                return self.win_to_proj(x, y)
529            else:
530                return None
531    
532        def set_current_position(self, event):
533            """Set the current position from event
534    
535            Should be called by all events that contain mouse positions
536            especially EVT_MOTION. The event paramete may be None to
537            indicate the the pointer left the window.
538            """
539            if event is not None:
540                self.current_position = (event.m_x, event.m_y)
541            else:
542                self.current_position = None
543            self.issue(VIEW_POSITION)
544    
545      def OnLeftDown(self, event):      def OnLeftDown(self, event):
546            self.set_current_position(event)
547          if self.tool is not None:          if self.tool is not None:
548              self.drag_dc = wxClientDC(self)              self.drag_dc = wxClientDC(self)
549              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wxINVERT)
# Line 458  class MapCanvas(wxWindow): Line 555  class MapCanvas(wxWindow):
555                    
556      def OnLeftUp(self, event):      def OnLeftUp(self, event):
557          self.ReleaseMouse()          self.ReleaseMouse()
558            self.set_current_position(event)
559          if self.dragging:          if self.dragging:
560              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
561              self.tool.MouseUp(event)              self.tool.MouseUp(event)
# Line 465  class MapCanvas(wxWindow): Line 563  class MapCanvas(wxWindow):
563          self.dragging = 0          self.dragging = 0
564    
565      def OnMotion(self, event):      def OnMotion(self, event):
566            self.set_current_position(event)
567          if self.dragging:          if self.dragging:
568              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
569              self.tool.MouseMove(event)              self.tool.MouseMove(event)
570              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
571    
572        def OnLeaveWindow(self, event):
573            self.set_current_position(None)
574    
575      def OnIdle(self, event):      def OnIdle(self, event):
576          if self.redraw_on_idle:          if self.redraw_on_idle:
577              self.do_redraw()              self.do_redraw()
578          self.redraw_on_idle = 0          self.redraw_on_idle = 0
579    
580        def OnSize(self, event):
581            # the window's size has changed. We have to get a new bitmap. If
582            # we want to be clever we could try to get by without throwing
583            # everything away. E.g. when the window gets smaller, we could
584            # either keep the bitmap or create the new one from the old one.
585            # Even when the window becomes larger some parts of the bitmap
586            # could be reused.
587            self.full_redraw()
588    
589      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
590          self.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            print "MapCanvas.shape_selected:", layer, shape
602            if ((shape is not None or self.last_selected_shape is not None)
603                and (shape != self.last_selected_shape
604                     or layer != self.last_selected_layer)):
605                print "MapCanvas.shape_selected: redraw",
606                self.full_redraw()
607            else:
608                print "MapCanvas.shape_selected: no redraw"
609            self.last_selected_layer = layer
610            self.last_selected_shape = shape
611    
612        def unprojected_rect_around_point(self, x, y):
613            """return a rect a few pixels around (x, y) in unprojected corrdinates
614    
615            The return value is a tuple (minx, miny, maxx, maxy) suitable a
616            parameter to a layer's ShapesInRegion method.
617            """
618            map_proj = self.map.projection
619            if map_proj is not None:
620                inverse = map_proj.Inverse
621            else:
622                inverse = None
623    
624            xs = []
625            ys = []
626            for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):
627                px, py = self.win_to_proj(x + dx, y + dy)
628                if inverse:
629                    px, py = inverse(px, py)
630                xs.append(px)
631                ys.append(py)
632            return (min(xs), min(ys), max(xs), max(ys))
633    
634      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):
635          """Determine the shape at point px, py in window coords          """Determine the shape at point px, py in window coords
# Line 500  class MapCanvas(wxWindow): Line 653  class MapCanvas(wxWindow):
653          scale = self.scale          scale = self.scale
654          offx, offy = self.offset          offx, offy = self.offset
655    
656            box = self.unprojected_rect_around_point(px, py)
657    
658          if select_labels:          if select_labels:
659              labels = self.map.LabelLayer().Labels()              labels = self.map.LabelLayer().Labels()
660                            
# Line 564  class MapCanvas(wxWindow): Line 719  class MapCanvas(wxWindow):
719              shapetype = layer.ShapeType()              shapetype = layer.ShapeType()
720    
721              select_shape = -1              select_shape = -1
722    
723                shape_ids = layer.ShapesInRegion(box)
724                shape_ids.reverse()
725    
726              if shapetype == SHAPETYPE_POLYGON:              if shapetype == SHAPETYPE_POLYGON:
727                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
728                      result = point_in_polygon_shape(layer.shapefile.cobject(),                      result = point_in_polygon_shape(layer.shapefile.cobject(),
729                                                      i,                                                      i,
730                                                      filled, stroked,                                                      filled, stroked,
# Line 576  class MapCanvas(wxWindow): Line 735  class MapCanvas(wxWindow):
735                          select_shape = i                          select_shape = i
736                          break                          break
737              elif shapetype == SHAPETYPE_ARC:              elif shapetype == SHAPETYPE_ARC:
738                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
739                      result = point_in_polygon_shape(layer.shapefile.cobject(),                      result = point_in_polygon_shape(layer.shapefile.cobject(),
740                                                      i, 0, 1,                                                      i, 0, 1,
741                                                      map_proj, layer_proj,                                                      map_proj, layer_proj,
# Line 586  class MapCanvas(wxWindow): Line 745  class MapCanvas(wxWindow):
745                          select_shape = i                          select_shape = i
746                          break                          break
747              elif shapetype == SHAPETYPE_POINT:              elif shapetype == SHAPETYPE_POINT:
748                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
749                      shape = layer.Shape(i)                      shape = layer.Shape(i)
750                      x, y = shape.Points()[0]                      x, y = shape.Points()[0]
751                      if inverse:                      if inverse:
# Line 604  class MapCanvas(wxWindow): Line 763  class MapCanvas(wxWindow):
763          return None, None          return None, None
764    
765      def SelectShapeAt(self, x, y):      def SelectShapeAt(self, x, y):
766          layer, shape = self.find_shape_at(x, y)          layer, shape = self.find_shape_at(x, y, selected_layer = 0)
767          # If layer is None, then shape will also be None. We don't want          # If layer is None, then shape will also be None. We don't want
768          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
769          # the already selected layer again.          # the already selected layer again.
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