/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 433 by jonathan, Mon Feb 24 18:47:49 2003 UTC revision 855 by frank, Wed May 7 18:24:27 2003 UTC
# Line 11  Classes for display of a map and interac Line 11  Classes for display of a map and interac
11    
12  __version__ = "$Revision$"  __version__ = "$Revision$"
13    
14    import sys
15    
16  from math import hypot  from math import hypot
17    
18  from wxPython.wx import wxWindow,\  from wxPython.wx import wxWindow,\
19       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
20       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW, \
21         wxBITMAP_TYPE_XPM, wxBeginBusyCursor, wxEndBusyCursor, wxCursor, \
22         wxImageFromBitmap
23    
24    
25  from wxPython import wx  from wxPython import wx
# Line 24  from wxproj import point_in_polygon_shap Line 28  from wxproj import point_in_polygon_shap
28    
29    
30  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \
31       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED       MAP_LAYERS_CHANGED, LAYER_CHANGED, LAYER_VISIBILITY_CHANGED
32  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
33       SHAPETYPE_POINT       SHAPETYPE_POINT
34  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
# Line 32  from Thuban.Model.label import ALIGN_CEN Line 36  from Thuban.Model.label import ALIGN_CEN
36  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
37  from Thuban.Model.color import Color  from Thuban.Model.color import Color
38    
39    import resource
40    
41    from selection import Selection
42  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, PrinterRender
43    
44  import labeldialog  import labeldialog
45    
46  from messages import SELECTED_SHAPE, VIEW_POSITION  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION, \
47                         SCALE_CHANGED
48    
49    
50  #  #
# Line 257  class MapCanvas(wxWindow, Publisher): Line 265  class MapCanvas(wxWindow, Publisher):
265    
266      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
267    
268      def __init__(self, parent, winid, interactor):      # Some messages that can be subscribed/unsubscribed directly through
269        # the MapCanvas come in fact from other objects. This is a dict
270        # mapping those messages to the names of the instance variables they
271        # actually come from. The delegation is implemented in the Subscribe
272        # and Unsubscribe methods
273        delegated_messages = {LAYER_SELECTED: "selection",
274                              SHAPES_SELECTED: "selection"}
275    
276        # Methods delegated to some instance variables. The delegation is
277        # implemented in the __getattr__ method.
278        delegated_methods = {"SelectLayer": "selection",
279                             "SelectShapes": "selection",
280                             "SelectedLayer": "selection",
281                             "HasSelectedLayer": "selection",
282                             "HasSelectedShapes": "selection"}
283    
284        def __init__(self, parent, winid):
285          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
286          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
287    
# Line 283  class MapCanvas(wxWindow, Publisher): Line 307  class MapCanvas(wxWindow, Publisher):
307          # the bitmap serving as backing store          # the bitmap serving as backing store
308          self.bitmap = None          self.bitmap = None
309    
310          # the interactor          # the selection
311          self.interactor = interactor          self.selection = Selection()
312          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)
313    
314          # keep track of which layers/shapes are selected to make sure we          # keep track of which layers/shapes are selected to make sure we
315          # only redraw when necessary          # only redraw when necessary
# Line 304  class MapCanvas(wxWindow, Publisher): Line 328  class MapCanvas(wxWindow, Publisher):
328          wxWindow.__del__(self)          wxWindow.__del__(self)
329          Publisher.__del__(self)          Publisher.__del__(self)
330    
331        def Subscribe(self, channel, *args):
332            """Extend the inherited method to handle delegated messages.
333    
334            If channel is one of the delegated messages call the appropriate
335            object's Subscribe method. Otherwise just call the inherited
336            method.
337            """
338            if channel in self.delegated_messages:
339                object = getattr(self, self.delegated_messages[channel])
340                object.Subscribe(channel, *args)
341            else:
342                Publisher.Subscribe(self, channel, *args)
343    
344        def Unsubscribe(self, channel, *args):
345            """Extend the inherited method to handle delegated messages.
346    
347            If channel is one of the delegated messages call the appropriate
348            object's Unsubscribe method. Otherwise just call the inherited
349            method.
350            """
351            if channel in self.delegated_messages:
352                object = getattr(self, self.delegated_messages[channel])
353                object.Unsubscribe(channel, *args)
354            else:
355                Publisher.Unsubscribe(self, channel, *args)
356    
357        def __getattr__(self, attr):
358            if attr in self.delegated_methods:
359                return getattr(getattr(self, self.delegated_methods[attr]), attr)
360            raise AttributeError(attr)
361    
362      def OnPaint(self, event):      def OnPaint(self, event):
363          dc = wxPaintDC(self)          dc = wxPaintDC(self)
364          if self.map is not None and self.map.HasLayers():          clear = self.map is None or not self.map.HasLayers()
365              self.do_redraw()  
366          else:          #wxBeginBusyCursor()
367    
368            if not clear:
369                try:
370                    self.do_redraw()
371                except:
372                    print "Error during drawing:", sys.exc_info()[0]
373                    clear = True
374    
375            if clear:
376              # 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
377              # the screen.              # the screen.
378    
# Line 320  class MapCanvas(wxWindow, Publisher): Line 384  class MapCanvas(wxWindow, Publisher):
384              dc.Clear()              dc.Clear()
385              dc.EndDrawing()              dc.EndDrawing()
386    
387            #wxEndBusyCursor()
388    
389      def do_redraw(self):      def do_redraw(self):
390          # This should only be called if we have a non-empty map.          # This should only be called if we have a non-empty map.
391    
# Line 336  class MapCanvas(wxWindow, Publisher): Line 402  class MapCanvas(wxWindow, Publisher):
402              dc.BeginDrawing()              dc.BeginDrawing()
403    
404              # clear the background              # clear the background
405              dc.SetBrush(wx.wxWHITE_BRUSH)              #dc.SetBrush(wx.wxWHITE_BRUSH)
406              dc.SetPen(wx.wxTRANSPARENT_PEN)              #dc.SetPen(wx.wxTRANSPARENT_PEN)
407              dc.DrawRectangle(0, 0, width, height)              #dc.DrawRectangle(0, 0, width, height)
408                dc.SetBackground(wx.wxWHITE_BRUSH)
409              if 1: #self.interactor.selected_map is self.map:              dc.Clear()
410                  selected_layer = self.interactor.selected_layer  
411                  selected_shape = self.interactor.selected_shape              selected_layer = self.selection.SelectedLayer()
412              else:              selected_shapes = self.selection.SelectedShapes()
                 selected_layer = None  
                 selected_shape = None  
413    
414              # draw the map into the bitmap              # draw the map into the bitmap
415              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.scale, self.offset)
# Line 353  class MapCanvas(wxWindow, Publisher): Line 417  class MapCanvas(wxWindow, Publisher):
417              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
418              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
419              renderer.RenderMap(self.map, (0, 0, width, height),              renderer.RenderMap(self.map, (0, 0, width, height),
420                                 selected_layer, selected_shape)                                 selected_layer, selected_shapes)
421    
422              dc.EndDrawing()              dc.EndDrawing()
423              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
# Line 374  class MapCanvas(wxWindow, Publisher): Line 438  class MapCanvas(wxWindow, Publisher):
438          printout.Destroy()          printout.Destroy()
439    
440      def SetMap(self, map):      def SetMap(self, map):
441          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
442                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
443          if self.map is not None:          if self.map is not None:
444              for channel in redraw_channels:              for channel in redraw_channels:
# Line 382  class MapCanvas(wxWindow, Publisher): Line 446  class MapCanvas(wxWindow, Publisher):
446              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
447                                   self.projection_changed)                                   self.projection_changed)
448          self.map = map          self.map = map
449            self.selection.ClearSelection()
450          if self.map is not None:          if self.map is not None:
451              for channel in redraw_channels:              for channel in redraw_channels:
452                  self.map.Subscribe(channel, self.full_redraw)                  self.map.Subscribe(channel, self.full_redraw)
# Line 411  class MapCanvas(wxWindow, Publisher): Line 476  class MapCanvas(wxWindow, Publisher):
476          self.scale = scale          self.scale = scale
477          self.offset = offset          self.offset = offset
478          self.full_redraw()          self.full_redraw()
479            self.issue(SCALE_CHANGED, scale)
480    
481      def proj_to_win(self, x, y):      def proj_to_win(self, x, y):
482          """\          """\
# Line 428  class MapCanvas(wxWindow, Publisher): Line 494  class MapCanvas(wxWindow, Publisher):
494    
495      def FitRectToWindow(self, rect):      def FitRectToWindow(self, rect):
496          """Fit the rectangular region given by rect into the window.          """Fit the rectangular region given by rect into the window.
497            
498          Set scale so that rect (in projected coordinates) just fits into          Set scale so that rect (in projected coordinates) just fits into
499          the window and center it.          the window and center it.
500          """          """
501          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
502          llx, lly, urx, ury = rect          llx, lly, urx, ury = rect
503          if llx == urx or lly == ury:          if llx == urx or lly == ury:
504              # zero with or zero height. Do Nothing              # zero width or zero height. Do Nothing
505              return              return
506          scalex = width / (urx - llx)          scalex = width / (urx - llx)
507          scaley = height / (ury - lly)          scaley = height / (ury - lly)
# Line 446  class MapCanvas(wxWindow, Publisher): Line 512  class MapCanvas(wxWindow, Publisher):
512    
513      def FitMapToWindow(self):      def FitMapToWindow(self):
514          """Fit the map to the window          """Fit the map to the window
515            
516          Set the scale so that the map fits exactly into the window and          Set the scale so that the map fits exactly into the window and
517          center it in the window.          center it in the window.
518          """          """
# Line 454  class MapCanvas(wxWindow, Publisher): Line 520  class MapCanvas(wxWindow, Publisher):
520          if bbox is not None:          if bbox is not None:
521              self.FitRectToWindow(bbox)              self.FitRectToWindow(bbox)
522    
523        def FitLayerToWindow(self, layer):
524            """Fit the given layer to the window.
525    
526            Set the scale so that the layer fits exactly into the window and
527            center it in the window.
528            """
529            
530            bbox = layer.LatLongBoundingBox()
531            if bbox is not None:
532                proj = self.map.GetProjection()
533                if proj is not None:
534                    bbox = proj.ForwardBBox(bbox)
535    
536                if bbox is not None:
537                    self.FitRectToWindow(bbox)
538    
539        def FitSelectedToWindow(self):
540            layer = self.selection.SelectedLayer()
541            shapes = self.selection.SelectedShapes()
542    
543            bbox = layer.ShapesBoundingBox(shapes)
544            if bbox is not None:
545                proj = self.map.GetProjection()
546                if proj is not None:
547                    bbox = proj.ForwardBBox(bbox)
548    
549                if bbox is not None:
550                    self.FitRectToWindow(bbox)
551    
552      def ZoomFactor(self, factor, center = None):      def ZoomFactor(self, factor, center = None):
553          """Multiply the zoom by factor and center on center.          """Multiply the zoom by factor and center on center.
554    
# Line 517  class MapCanvas(wxWindow, Publisher): Line 612  class MapCanvas(wxWindow, Publisher):
612      def PanTool(self):      def PanTool(self):
613          """Start the pan tool"""          """Start the pan tool"""
614          self.SelectTool(PanTool(self))          self.SelectTool(PanTool(self))
615            #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)
616            #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)
617            #print bmp
618            #img = wxImageFromBitmap(bmp)
619            #print img
620            #cur = wxCursor(img)
621            #print cur
622            #self.SetCursor(cur)
623    
624      def IdentifyTool(self):      def IdentifyTool(self):
625          """Start the identify tool"""          """Start the identify tool"""
# Line 595  class MapCanvas(wxWindow, Publisher): Line 698  class MapCanvas(wxWindow, Publisher):
698          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
699          # could be reused.          # could be reused.
700          self.full_redraw()          self.full_redraw()
701            pass
702    
703      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
704          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
705            # The selection object takes care that it only issues
706          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
707          when necessary.          # actually changed, so we can do a full redraw unconditionally.
708          """          # FIXME: We should perhaps try to limit the redraw to the are
709          # A redraw is necessary when the display has to change, which          # actually covered by the shapes before and after the selection
710          # means that either the status changes from having no selection          # change.
711          # to having a selection shape or vice versa, or when the fact          self.full_redraw()
         # whether there is a selection at all doesn't change, when the  
         # shape which is selected has changed (which means that layer or  
         # shapeid changes).  
         if ((shape is not None or self.last_selected_shape is not None)  
             and (shape != self.last_selected_shape  
                  or layer != self.last_selected_layer)):  
             self.full_redraw()  
   
         # remember the selection so we can compare when it changes again.  
         self.last_selected_layer = layer  
         self.last_selected_shape = shape  
712    
713      def unprojected_rect_around_point(self, x, y, dist):      def unprojected_rect_around_point(self, x, y, dist):
714          """return a rect dist pixels around (x, y) in unprojected corrdinates          """return a rect dist pixels around (x, y) in unprojected corrdinates
# Line 708  class MapCanvas(wxWindow, Publisher): Line 801  class MapCanvas(wxWindow, Publisher):
801                  continue                  continue
802    
803              filled = layer.GetClassification().GetDefaultFill() \              filled = layer.GetClassification().GetDefaultFill() \
804                       is not Color.None                       is not Color.Transparent
805              stroked = layer.GetClassification().GetDefaultStroke() \              stroked = layer.GetClassification().GetDefaultLineColor() \
806                        is not Color.None                        is not Color.Transparent
807    
808              layer_proj = layer.projection              layer_proj = layer.projection
809              if layer_proj is not None:              if layer_proj is not None:
# Line 789  class MapCanvas(wxWindow, Publisher): Line 882  class MapCanvas(wxWindow, Publisher):
882          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
883          # the already selected layer again.          # the already selected layer again.
884          if layer is None:          if layer is None:
885              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
886          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
887            else:
888                shapes = [shape]
889            self.selection.SelectShapes(layer, shapes)
890          return result          return result
891    
892      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
Legend:
Removed from v.433  
changed lines
  Added in v.855
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