/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 301 by bh, Mon Sep 2 15:59:11 2002 UTC revision 824 by jonathan, Tue May 6 08:09:27 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  #  #
# 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, \
35       ALIGN_LEFT, ALIGN_RIGHT       ALIGN_LEFT, ALIGN_RIGHT
36  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
37    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    
48    
49  #  #
# Line 256  class MapCanvas(wxWindow, Publisher): Line 264  class MapCanvas(wxWindow, Publisher):
264    
265      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
266    
267      def __init__(self, parent, winid, interactor):      # Some messages that can be subscribed/unsubscribed directly through
268        # the MapCanvas come in fact from other objects. This is a dict
269        # mapping those messages to the names of the instance variables they
270        # actually come from. The delegation is implemented in the Subscribe
271        # and Unsubscribe methods
272        delegated_messages = {LAYER_SELECTED: "selection",
273                              SHAPES_SELECTED: "selection"}
274    
275        # Methods delegated to some instance variables. The delegation is
276        # implemented in the __getattr__ method.
277        delegated_methods = {"SelectLayer": "selection",
278                             "SelectShapes": "selection",
279                             "SelectedLayer": "selection",
280                             "HasSelectedLayer": "selection"}
281    
282        def __init__(self, parent, winid):
283          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
284          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
285    
# Line 279  class MapCanvas(wxWindow, Publisher): Line 302  class MapCanvas(wxWindow, Publisher):
302          # if the mouse is outside the window.          # if the mouse is outside the window.
303          self.current_position = None          self.current_position = None
304    
         # If true, OnIdle will call do_redraw to do the actual  
         # redrawing. Set by OnPaint to avoid some unnecessary redraws.  
         # To force a redraw call full_redraw().  
         self.redraw_on_idle = 0  
   
305          # the bitmap serving as backing store          # the bitmap serving as backing store
306          self.bitmap = None          self.bitmap = None
307    
308          # the interactor          # the selection
309          self.interactor = interactor          self.selection = Selection()
310          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)
311    
312          # keep track of which layers/shapes are selected to make sure we          # keep track of which layers/shapes are selected to make sure we
313          # only redraw when necessary          # only redraw when necessary
# Line 303  class MapCanvas(wxWindow, Publisher): Line 321  class MapCanvas(wxWindow, Publisher):
321          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
322          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
323          wx.EVT_SIZE(self, self.OnSize)          wx.EVT_SIZE(self, self.OnSize)
         wx.EVT_IDLE(self, self.OnIdle)  
324    
325      def __del__(self):      def __del__(self):
326          wxWindow.__del__(self)          wxWindow.__del__(self)
327          Publisher.__del__(self)          Publisher.__del__(self)
328    
329        def Subscribe(self, channel, *args):
330            """Extend the inherited method to handle delegated messages.
331    
332            If channel is one of the delegated messages call the appropriate
333            object's Subscribe method. Otherwise just call the inherited
334            method.
335            """
336            if channel in self.delegated_messages:
337                object = getattr(self, self.delegated_messages[channel])
338                object.Subscribe(channel, *args)
339            else:
340                Publisher.Subscribe(self, channel, *args)
341    
342        def Unsubscribe(self, channel, *args):
343            """Extend the inherited method to handle delegated messages.
344    
345            If channel is one of the delegated messages call the appropriate
346            object's Unsubscribe method. Otherwise just call the inherited
347            method.
348            """
349            if channel in self.delegated_messages:
350                object = getattr(self, self.delegated_messages[channel])
351                object.Unsubscribe(channel, *args)
352            else:
353                Publisher.Unsubscribe(self, channel, *args)
354    
355        def __getattr__(self, attr):
356            if attr in self.delegated_methods:
357                return getattr(getattr(self, self.delegated_methods[attr]), attr)
358            raise AttributeError(attr)
359    
360      def OnPaint(self, event):      def OnPaint(self, event):
361          dc = wxPaintDC(self)          dc = wxPaintDC(self)
362          if self.map is not None and self.map.HasLayers():          clear = self.map is None or not self.map.HasLayers()
363              # We have a non-empty map. Redraw it in idle time  
364              self.redraw_on_idle = 1          #wxBeginBusyCursor()
365          else:  
366            if not clear:
367                try:
368                    self.do_redraw()
369                except:
370                    print "Error during drawing:", sys.exc_info()[0]
371                    clear = True
372    
373            if clear:
374              # 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
375              # the screen.              # the screen.
376    
# Line 326  class MapCanvas(wxWindow, Publisher): Line 382  class MapCanvas(wxWindow, Publisher):
382              dc.Clear()              dc.Clear()
383              dc.EndDrawing()              dc.EndDrawing()
384    
385            #wxEndBusyCursor()
386    
387      def do_redraw(self):      def do_redraw(self):
388          # This should only be called if we have a non-empty map.          # This should only be called if we have a non-empty map.
389    
# Line 342  class MapCanvas(wxWindow, Publisher): Line 400  class MapCanvas(wxWindow, Publisher):
400              dc.BeginDrawing()              dc.BeginDrawing()
401    
402              # clear the background              # clear the background
403              dc.SetBrush(wx.wxWHITE_BRUSH)              #dc.SetBrush(wx.wxWHITE_BRUSH)
404              dc.SetPen(wx.wxTRANSPARENT_PEN)              #dc.SetPen(wx.wxTRANSPARENT_PEN)
405              dc.DrawRectangle(0, 0, width, height)              #dc.DrawRectangle(0, 0, width, height)
406                dc.SetBackground(wx.wxWHITE_BRUSH)
407              if 1: #self.interactor.selected_map is self.map:              dc.Clear()
408                  selected_layer = self.interactor.selected_layer  
409                  selected_shape = self.interactor.selected_shape              selected_layer = self.selection.SelectedLayer()
410              else:              selected_shapes = self.selection.SelectedShapes()
                 selected_layer = None  
                 selected_shape = None  
411    
412              # draw the map into the bitmap              # draw the map into the bitmap
413              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.scale, self.offset)
# Line 359  class MapCanvas(wxWindow, Publisher): Line 415  class MapCanvas(wxWindow, Publisher):
415              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
416              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
417              renderer.RenderMap(self.map, (0, 0, width, height),              renderer.RenderMap(self.map, (0, 0, width, height),
418                                 selected_layer, selected_shape)                                 selected_layer, selected_shapes)
419    
420              dc.EndDrawing()              dc.EndDrawing()
421              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
# Line 380  class MapCanvas(wxWindow, Publisher): Line 436  class MapCanvas(wxWindow, Publisher):
436          printout.Destroy()          printout.Destroy()
437    
438      def SetMap(self, map):      def SetMap(self, map):
439          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
440                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
441          if self.map is not None:          if self.map is not None:
442              for channel in redraw_channels:              for channel in redraw_channels:
# Line 388  class MapCanvas(wxWindow, Publisher): Line 444  class MapCanvas(wxWindow, Publisher):
444              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
445                                   self.projection_changed)                                   self.projection_changed)
446          self.map = map          self.map = map
447            self.selection.ClearSelection()
448          if self.map is not None:          if self.map is not None:
449              for channel in redraw_channels:              for channel in redraw_channels:
450                  self.map.Subscribe(channel, self.full_redraw)                  self.map.Subscribe(channel, self.full_redraw)
# Line 434  class MapCanvas(wxWindow, Publisher): Line 491  class MapCanvas(wxWindow, Publisher):
491    
492      def FitRectToWindow(self, rect):      def FitRectToWindow(self, rect):
493          """Fit the rectangular region given by rect into the window.          """Fit the rectangular region given by rect into the window.
494            
495          Set scale so that rect (in projected coordinates) just fits into          Set scale so that rect (in projected coordinates) just fits into
496          the window and center it.          the window and center it.
497          """          """
498          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
499          llx, lly, urx, ury = rect          llx, lly, urx, ury = rect
500          if llx == urx or lly == ury:          if llx == urx or lly == ury:
501              # zero with or zero height. Do Nothing              # zero width or zero height. Do Nothing
502              return              return
503          scalex = width / (urx - llx)          scalex = width / (urx - llx)
504          scaley = height / (ury - lly)          scaley = height / (ury - lly)
# Line 452  class MapCanvas(wxWindow, Publisher): Line 509  class MapCanvas(wxWindow, Publisher):
509    
510      def FitMapToWindow(self):      def FitMapToWindow(self):
511          """Fit the map to the window          """Fit the map to the window
512            
513          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
514          center it in the window.          center it in the window.
515          """          """
# Line 460  class MapCanvas(wxWindow, Publisher): Line 517  class MapCanvas(wxWindow, Publisher):
517          if bbox is not None:          if bbox is not None:
518              self.FitRectToWindow(bbox)              self.FitRectToWindow(bbox)
519    
520        def FitLayerToWindow(self, layer):
521            """Fit the given layer to the window.
522    
523            Set the scale so that the layer fits exactly into the window and
524            center it in the window.
525            """
526            
527            bbox = layer.LatLongBoundingBox()
528            if bbox is not None:
529                proj = self.map.GetProjection()
530                if proj is not None:
531                    bbox = proj.ForwardBBox(bbox)
532    
533                if bbox is not None:
534                    self.FitRectToWindow(bbox)
535    
536      def ZoomFactor(self, factor, center = None):      def ZoomFactor(self, factor, center = None):
537          """Multiply the zoom by factor and center on center.          """Multiply the zoom by factor and center on center.
538    
# Line 504  class MapCanvas(wxWindow, Publisher): Line 577  class MapCanvas(wxWindow, Publisher):
577          offx, offy = self.offset          offx, offy = self.offset
578          self.set_view_transform(self.scale, (offx + dx, offy + dy))          self.set_view_transform(self.scale, (offx + dx, offy + dy))
579    
580        def SelectTool(self, tool):
581            """Make tool the active tool.
582    
583            The parameter should be an instance of Tool or None to indicate
584            that no tool is active.
585            """
586            self.tool = tool
587    
588      def ZoomInTool(self):      def ZoomInTool(self):
589          """Start the zoom in tool"""          """Start the zoom in tool"""
590          self.tool = ZoomInTool(self)          self.SelectTool(ZoomInTool(self))
591    
592      def ZoomOutTool(self):      def ZoomOutTool(self):
593          """Start the zoom out tool"""          """Start the zoom out tool"""
594          self.tool = ZoomOutTool(self)          self.SelectTool(ZoomOutTool(self))
595    
596      def PanTool(self):      def PanTool(self):
597          """Start the pan tool"""          """Start the pan tool"""
598          self.tool = PanTool(self)          self.SelectTool(PanTool(self))
599            #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)
600            #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)
601            #print bmp
602            #img = wxImageFromBitmap(bmp)
603            #print img
604            #cur = wxCursor(img)
605            #print cur
606            #self.SetCursor(cur)
607    
608      def IdentifyTool(self):      def IdentifyTool(self):
609          """Start the identify tool"""          """Start the identify tool"""
610          self.tool = IdentifyTool(self)          self.SelectTool(IdentifyTool(self))
611    
612      def LabelTool(self):      def LabelTool(self):
613          """Start the label tool"""          """Start the label tool"""
614          self.tool = LabelTool(self)          self.SelectTool(LabelTool(self))
615    
616      def CurrentTool(self):      def CurrentTool(self):
617          """Return the name of the current tool or None if no tool is active"""          """Return the name of the current tool or None if no tool is active"""
# Line 568  class MapCanvas(wxWindow, Publisher): Line 657  class MapCanvas(wxWindow, Publisher):
657          self.set_current_position(event)          self.set_current_position(event)
658          if self.dragging:          if self.dragging:
659              self.ReleaseMouse()              self.ReleaseMouse()
660              self.tool.Hide(self.drag_dc)              try:
661              self.tool.MouseUp(event)                  self.tool.Hide(self.drag_dc)
662              self.drag_dc = None                  self.tool.MouseUp(event)
663          self.dragging = 0              finally:
664                    self.drag_dc = None
665                    self.dragging = 0
666    
667      def OnMotion(self, event):      def OnMotion(self, event):
668          self.set_current_position(event)          self.set_current_position(event)
# Line 583  class MapCanvas(wxWindow, Publisher): Line 674  class MapCanvas(wxWindow, Publisher):
674      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
675          self.set_current_position(None)          self.set_current_position(None)
676    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
677      def OnSize(self, event):      def OnSize(self, event):
678          # the window's size has changed. We have to get a new bitmap. If          # the window's size has changed. We have to get a new bitmap. If
679          # we want to be clever we could try to get by without throwing          # we want to be clever we could try to get by without throwing
# Line 596  class MapCanvas(wxWindow, Publisher): Line 682  class MapCanvas(wxWindow, Publisher):
682          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
683          # could be reused.          # could be reused.
684          self.full_redraw()          self.full_redraw()
685            pass
686    
687      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
688          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
689            # The selection object takes care that it only issues
690          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
691          when necessary.          # actually changed, so we can do a full redraw unconditionally.
692          """          # FIXME: We should perhaps try to limit the redraw to the are
693          # A redraw is necessary when the display has to change, which          # actually covered by the shapes before and after the selection
694          # means that either the status changes from having no selection          # change.
695          # 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  
696    
697      def unprojected_rect_around_point(self, x, y, dist):      def unprojected_rect_around_point(self, x, y, dist):
698          """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 784  class MapCanvas(wxWindow, Publisher):
784              if not layer.Visible():              if not layer.Visible():
785                  continue                  continue
786    
787              filled = layer.fill is not None              filled = layer.GetClassification().GetDefaultFill() \
788              stroked = layer.stroke is not None                       is not Color.Transparent
789                stroked = layer.GetClassification().GetDefaultLineColor() \
790                          is not Color.Transparent
791    
792              layer_proj = layer.projection              layer_proj = layer.projection
793              if layer_proj is not None:              if layer_proj is not None:
# Line 788  class MapCanvas(wxWindow, Publisher): Line 866  class MapCanvas(wxWindow, Publisher):
866          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
867          # the already selected layer again.          # the already selected layer again.
868          if layer is None:          if layer is None:
869              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
870          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
871            else:
872                shapes = [shape]
873            self.selection.SelectShapes(layer, shapes)
874          return result          return result
875    
876      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
Legend:
Removed from v.301  
changed lines
  Added in v.824
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