/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 296 by bh, Fri Aug 30 16:10:45 2002 UTC revision 610 by jonathan, Fri Apr 4 13:56:59 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 24  from wxproj import point_in_polygon_shap Line 24  from wxproj import point_in_polygon_shap
24    
25    
26  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \
27       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED       MAP_LAYERS_CHANGED, LAYER_CHANGED, LAYER_VISIBILITY_CHANGED
28  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
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  from Thuban.Lib.connector import Publisher
33    from Thuban.Model.color import Color
34    
35    from selection import Selection
36  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, PrinterRender
37    
38  import labeldialog  import labeldialog
39    
40  from messages import SELECTED_SHAPE, VIEW_POSITION  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION
41    
42    
43  #  #
# Line 256  class MapCanvas(wxWindow, Publisher): Line 258  class MapCanvas(wxWindow, Publisher):
258    
259      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
260    
261      def __init__(self, parent, winid, interactor):      # Some messages that can be subscribed/unsubscribed directly through
262        # the MapCanvas come in fact from other objects. This is a map to
263        # map those messages to the names of the instance variables they
264        # actually come from. This delegation is implemented in the
265        # Subscribe and unsubscribed methods
266        delegated_messages = {LAYER_SELECTED: "selection",
267                              SHAPES_SELECTED: "selection"}
268    
269        # Methods delegated to some instance variables. The delegation is
270        # implemented in the __getattr__ method.
271        delegated_methods = {"SelectLayer": "selection",
272                             "SelectShapes": "selection",
273                             "SelectedLayer": "selection",
274                             "HasSelectedLayer": "selection"}
275    
276        def __init__(self, parent, winid):
277          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
278          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
279    
# Line 279  class MapCanvas(wxWindow, Publisher): Line 296  class MapCanvas(wxWindow, Publisher):
296          # if the mouse is outside the window.          # if the mouse is outside the window.
297          self.current_position = None          self.current_position = None
298    
         # 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  
   
299          # the bitmap serving as backing store          # the bitmap serving as backing store
300          self.bitmap = None          self.bitmap = None
301    
302          # the interactor          # the selection
303          self.interactor = interactor          self.selection = Selection()
304          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)
305    
306          # keep track of which layers/shapes are selected to make sure we          # keep track of which layers/shapes are selected to make sure we
307          # only redraw when necessary          # only redraw when necessary
# Line 303  class MapCanvas(wxWindow, Publisher): Line 315  class MapCanvas(wxWindow, Publisher):
315          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
316          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
317          wx.EVT_SIZE(self, self.OnSize)          wx.EVT_SIZE(self, self.OnSize)
         wx.EVT_IDLE(self, self.OnIdle)  
318    
319      def __del__(self):      def __del__(self):
320          wxWindow.__del__(self)          wxWindow.__del__(self)
321          Publisher.__del__(self)          Publisher.__del__(self)
322    
323        def Subscribe(self, channel, *args):
324            """Extend the inherited method to handle delegated messages.
325    
326            If channel is one of the delegated messages call the appropriate
327            object's Subscribe method. Otherwise just call the inherited
328            method.
329            """
330            if channel in self.delegated_messages:
331                object = getattr(self, self.delegated_messages[channel])
332                object.Subscribe(channel, *args)
333            else:
334                Publisher.Subscribe(self, channel, *args)
335    
336        def Unsubscribe(self, channel, *args):
337            """Extend the inherited method to handle delegated messages.
338    
339            If channel is one of the delegated messages call the appropriate
340            object's Unsubscribe method. Otherwise just call the inherited
341            method.
342            """
343            if channel in self.delegated_messages:
344                object = getattr(self, self.delegated_messages[channel])
345                object.Unsubscribe(channel, *args)
346            else:
347                Publisher.Unsubscribe(self, channel, *args)
348    
349        def __getattr__(self, attr):
350            if attr in self.delegated_methods:
351                return getattr(getattr(self, self.delegated_methods[attr]), attr)
352            raise AttributeError(attr)
353    
354      def OnPaint(self, event):      def OnPaint(self, event):
355          dc = wxPaintDC(self)          dc = wxPaintDC(self)
356          if self.map is not None and self.map.HasLayers():          if self.map is not None and self.map.HasLayers():
357              # We have a non-empty map. Redraw it in idle time              self.do_redraw()
             self.redraw_on_idle = 1  
358          else:          else:
359              # 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
360              # the screen.              # the screen.
# Line 346  class MapCanvas(wxWindow, Publisher): Line 387  class MapCanvas(wxWindow, Publisher):
387              dc.SetPen(wx.wxTRANSPARENT_PEN)              dc.SetPen(wx.wxTRANSPARENT_PEN)
388              dc.DrawRectangle(0, 0, width, height)              dc.DrawRectangle(0, 0, width, height)
389    
390              if 1: #self.interactor.selected_map is self.map:              selected_layer = self.selection.SelectedLayer()
391                  selected_layer = self.interactor.selected_layer              selected_shapes = self.selection.SelectedShapes()
                 selected_shape = self.interactor.selected_shape  
             else:  
                 selected_layer = None  
                 selected_shape = None  
392    
393              # draw the map into the bitmap              # draw the map into the bitmap
394              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.scale, self.offset)
# Line 359  class MapCanvas(wxWindow, Publisher): Line 396  class MapCanvas(wxWindow, Publisher):
396              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
397              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
398              renderer.RenderMap(self.map, (0, 0, width, height),              renderer.RenderMap(self.map, (0, 0, width, height),
399                                 selected_layer, selected_shape)                                 selected_layer, selected_shapes)
400    
401              dc.EndDrawing()              dc.EndDrawing()
402              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
# Line 380  class MapCanvas(wxWindow, Publisher): Line 417  class MapCanvas(wxWindow, Publisher):
417          printout.Destroy()          printout.Destroy()
418    
419      def SetMap(self, map):      def SetMap(self, map):
420          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
421                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
422          if self.map is not None:          if self.map is not None:
423              for channel in redraw_channels:              for channel in redraw_channels:
# Line 388  class MapCanvas(wxWindow, Publisher): Line 425  class MapCanvas(wxWindow, Publisher):
425              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
426                                   self.projection_changed)                                   self.projection_changed)
427          self.map = map          self.map = map
428            self.selection.ClearSelection()
429          if self.map is not None:          if self.map is not None:
430              for channel in redraw_channels:              for channel in redraw_channels:
431                  self.map.Subscribe(channel, self.full_redraw)                  self.map.Subscribe(channel, self.full_redraw)
# Line 434  class MapCanvas(wxWindow, Publisher): Line 472  class MapCanvas(wxWindow, Publisher):
472    
473      def FitRectToWindow(self, rect):      def FitRectToWindow(self, rect):
474          """Fit the rectangular region given by rect into the window.          """Fit the rectangular region given by rect into the window.
475            
476          Set scale so that rect (in projected coordinates) just fits into          Set scale so that rect (in projected coordinates) just fits into
477          the window and center it.          the window and center it.
478          """          """
# Line 452  class MapCanvas(wxWindow, Publisher): Line 490  class MapCanvas(wxWindow, Publisher):
490    
491      def FitMapToWindow(self):      def FitMapToWindow(self):
492          """Fit the map to the window          """Fit the map to the window
493            
494          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
495          center it in the window.          center it in the window.
496          """          """
# Line 504  class MapCanvas(wxWindow, Publisher): Line 542  class MapCanvas(wxWindow, Publisher):
542          offx, offy = self.offset          offx, offy = self.offset
543          self.set_view_transform(self.scale, (offx + dx, offy + dy))          self.set_view_transform(self.scale, (offx + dx, offy + dy))
544    
545        def SelectTool(self, tool):
546            """Make tool the active tool.
547    
548            The parameter should be an instance of Tool or None to indicate
549            that no tool is active.
550            """
551            self.tool = tool
552    
553      def ZoomInTool(self):      def ZoomInTool(self):
554          """Start the zoom in tool"""          """Start the zoom in tool"""
555          self.tool = ZoomInTool(self)          self.SelectTool(ZoomInTool(self))
556    
557      def ZoomOutTool(self):      def ZoomOutTool(self):
558          """Start the zoom out tool"""          """Start the zoom out tool"""
559          self.tool = ZoomOutTool(self)          self.SelectTool(ZoomOutTool(self))
560    
561      def PanTool(self):      def PanTool(self):
562          """Start the pan tool"""          """Start the pan tool"""
563          self.tool = PanTool(self)          self.SelectTool(PanTool(self))
564    
565      def IdentifyTool(self):      def IdentifyTool(self):
566          """Start the identify tool"""          """Start the identify tool"""
567          self.tool = IdentifyTool(self)          self.SelectTool(IdentifyTool(self))
568    
569      def LabelTool(self):      def LabelTool(self):
570          """Start the label tool"""          """Start the label tool"""
571          self.tool = LabelTool(self)          self.SelectTool(LabelTool(self))
572    
573      def CurrentTool(self):      def CurrentTool(self):
574          """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 614  class MapCanvas(wxWindow, Publisher):
614          self.set_current_position(event)          self.set_current_position(event)
615          if self.dragging:          if self.dragging:
616              self.ReleaseMouse()              self.ReleaseMouse()
617              self.tool.Hide(self.drag_dc)              try:
618              self.tool.MouseUp(event)                  self.tool.Hide(self.drag_dc)
619              self.drag_dc = None                  self.tool.MouseUp(event)
620          self.dragging = 0              finally:
621                    self.drag_dc = None
622                    self.dragging = 0
623    
624      def OnMotion(self, event):      def OnMotion(self, event):
625          self.set_current_position(event)          self.set_current_position(event)
# Line 583  class MapCanvas(wxWindow, Publisher): Line 631  class MapCanvas(wxWindow, Publisher):
631      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
632          self.set_current_position(None)          self.set_current_position(None)
633    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
634      def OnSize(self, event):      def OnSize(self, event):
635          # 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
636          # 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 598  class MapCanvas(wxWindow, Publisher): Line 641  class MapCanvas(wxWindow, Publisher):
641          self.full_redraw()          self.full_redraw()
642    
643      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
644          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
645            # The selection object takes care that it only issues
646          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
647          when necessary.          # actually changed, so we can do a full redraw unconditionally.
648          """          # FIXME: We should perhaps try to limit the redraw to the are
649          # A redraw is necessary when the display has to change, which          # actually covered by the shapes before and after the selection
650          # means that either the status changes from having no selection          # change.
651          # 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  
652    
653      def unprojected_rect_around_point(self, x, y):      def unprojected_rect_around_point(self, x, y, dist):
654          """return a rect a few pixels around (x, y) in unprojected corrdinates          """return a rect dist pixels around (x, y) in unprojected corrdinates
655    
656          The return value is a tuple (minx, miny, maxx, maxy) suitable a          The return value is a tuple (minx, miny, maxx, maxy) suitable a
657          parameter to a layer's ShapesInRegion method.          parameter to a layer's ShapesInRegion method.
# Line 633  class MapCanvas(wxWindow, Publisher): Line 665  class MapCanvas(wxWindow, Publisher):
665          xs = []          xs = []
666          ys = []          ys = []
667          for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):          for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):
668              px, py = self.win_to_proj(x + dx, y + dy)              px, py = self.win_to_proj(x + dist * dx, y + dist * dy)
669              if inverse:              if inverse:
670                  px, py = inverse(px, py)                  px, py = inverse(px, py)
671              xs.append(px)              xs.append(px)
# Line 662  class MapCanvas(wxWindow, Publisher): Line 694  class MapCanvas(wxWindow, Publisher):
694          scale = self.scale          scale = self.scale
695          offx, offy = self.offset          offx, offy = self.offset
696    
         box = self.unprojected_rect_around_point(px, py)  
   
697          if select_labels:          if select_labels:
698              labels = self.map.LabelLayer().Labels()              labels = self.map.LabelLayer().Labels()
699    
# Line 710  class MapCanvas(wxWindow, Publisher): Line 740  class MapCanvas(wxWindow, Publisher):
740              if not layer.Visible():              if not layer.Visible():
741                  continue                  continue
742    
743              filled = layer.fill is not None              filled = layer.GetClassification().GetDefaultFill() \
744              stroked = layer.stroke is not None                       is not Color.Transparent
745                stroked = layer.GetClassification().GetDefaultLineColor() \
746                          is not Color.Transparent
747    
748              layer_proj = layer.projection              layer_proj = layer.projection
749              if layer_proj is not None:              if layer_proj is not None:
# Line 723  class MapCanvas(wxWindow, Publisher): Line 755  class MapCanvas(wxWindow, Publisher):
755    
756              select_shape = -1              select_shape = -1
757    
758                # Determine the ids of the shapes that overlap a tiny area
759                # around the point. For layers containing points we have to
760                # choose a larger size of the box we're testing agains so
761                # that we take the size of the markers into account
762                # FIXME: Once the markers are more flexible this part has to
763                # become more flexible too, of course
764                if shapetype == SHAPETYPE_POINT:
765                    box = self.unprojected_rect_around_point(px, py, 5)
766                else:
767                    box = self.unprojected_rect_around_point(px, py, 1)
768              shape_ids = layer.ShapesInRegion(box)              shape_ids = layer.ShapesInRegion(box)
769              shape_ids.reverse()              shape_ids.reverse()
770    
# Line 780  class MapCanvas(wxWindow, Publisher): Line 822  class MapCanvas(wxWindow, Publisher):
822          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
823          # the already selected layer again.          # the already selected layer again.
824          if layer is None:          if layer is None:
825              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
826          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
827            else:
828                shapes = [shape]
829            self.selection.SelectShapes(layer, shapes)
830          return result          return result
831    
832      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
Legend:
Removed from v.296  
changed lines
  Added in v.610
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