/[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 967 by jonathan, Wed May 21 17:24:54 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    # Frank Koormann <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 11  Classes for display of a map and interac Line 12  Classes for display of a map and interac
12    
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    
15    from Thuban import _
16    
17    import sys
18    import os.path
19    
20  from math import hypot  from math import hypot
21    
22  from wxPython.wx import wxWindow,\  from wxPython.wx import wxWindow,\
23       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
24       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, \
25         wxBITMAP_TYPE_XPM, wxBeginBusyCursor, wxEndBusyCursor, wxCursor, \
26         wxImageFromBitmap, wxPlatform
27    
28    # Export related stuff
29    if wxPlatform == '__WXMSW__':
30        from wxPython.wx import wxMetaFileDC
31    from wxPython.wx import wxFileDialog, wxSAVE, wxOVERWRITE_PROMPT, wxID_OK
32    
33  from wxPython import wx  from wxPython import wx
34    
35  from wxproj import point_in_polygon_shape, shape_centroid  from wxproj import point_in_polygon_shape, shape_centroid
36    
   
37  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \
38       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED       MAP_LAYERS_CHANGED, LAYER_CHANGED, LAYER_VISIBILITY_CHANGED
39  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
40       SHAPETYPE_POINT       SHAPETYPE_POINT
41  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
42       ALIGN_LEFT, ALIGN_RIGHT       ALIGN_LEFT, ALIGN_RIGHT
43  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
44    from Thuban.Model.color import Color
45    
46    import resource
47    
48  from renderer import ScreenRenderer, PrinterRender  from selection import Selection
49    from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
50    
51  import labeldialog  import labeldialog
52    
53  from messages import SELECTED_SHAPE, VIEW_POSITION  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION, \
54                         SCALE_CHANGED
55    
56    
57  #  #
# Line 215  class LabelTool(Tool): Line 231  class LabelTool(Tool):
231          self.view.LabelShapeAt(event.m_x, event.m_y)          self.view.LabelShapeAt(event.m_x, event.m_y)
232    
233    
   
   
234  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.wxPrintout):
235    
236      """      """
237      wxPrintout class for printing Thuban maps      wxPrintout class for printing Thuban maps
238      """      """
239    
240      def __init__(self, map):      def __init__(self, canvas, map, region, selected_layer, selected_shapes):
241          wx.wxPrintout.__init__(self)          wx.wxPrintout.__init__(self)
242            self.canvas = canvas
243          self.map = map          self.map = map
244            self.region = region
245            self.selected_layer = selected_layer
246            self.selected_shapes = selected_shapes
247    
248      def GetPageInfo(self):      def GetPageInfo(self):
249          return (1, 1, 1, 1)          return (1, 1, 1, 1)
# Line 239  class MapPrintout(wx.wxPrintout): Line 257  class MapPrintout(wx.wxPrintout):
257    
258      def draw_on_dc(self, dc):      def draw_on_dc(self, dc):
259          width, height = self.GetPageSizePixels()          width, height = self.GetPageSizePixels()
260          llx, lly, urx, ury = self.map.ProjectedBoundingBox()          scale, offset, mapregion = OutputTransform(self.canvas.scale,
261          scalex = width / (urx - llx)                                                     self.canvas.offset,
262          scaley = height / (ury - lly)                                                     self.canvas.GetSizeTuple(),
263          scale = min(scalex, scaley)                                                     self.GetPageSizePixels())
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
   
264          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
265          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          renderer = PrinterRenderer(dc, scale, offset, resolution = resy)
266          renderer.RenderMap(self.map)          x, y, width, height = self.region
267            canvas_scale = self.canvas.scale
268            renderer.RenderMap(self.map,
269                               (0,0,
270                                    (width/canvas_scale)*scale,
271                                    (height/canvas_scale)*scale),
272                                    mapregion,
273                               self.selected_layer, self.selected_shapes)
274          return wx.true          return wx.true
275    
276    
# Line 256  class MapCanvas(wxWindow, Publisher): Line 278  class MapCanvas(wxWindow, Publisher):
278    
279      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
280    
281      def __init__(self, parent, winid, interactor):      # Some messages that can be subscribed/unsubscribed directly through
282        # the MapCanvas come in fact from other objects. This is a dict
283        # mapping those messages to the names of the instance variables they
284        # actually come from. The delegation is implemented in the Subscribe
285        # and Unsubscribe methods
286        delegated_messages = {LAYER_SELECTED: "selection",
287                              SHAPES_SELECTED: "selection"}
288    
289        # Methods delegated to some instance variables. The delegation is
290        # implemented in the __getattr__ method.
291        delegated_methods = {"SelectLayer": "selection",
292                             "SelectShapes": "selection",
293                             "SelectedLayer": "selection",
294                             "HasSelectedLayer": "selection",
295                             "HasSelectedShapes": "selection",
296                             "SelectedShapes": "selection"}
297    
298        def __init__(self, parent, winid):
299          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
300          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
301    
# Line 279  class MapCanvas(wxWindow, Publisher): Line 318  class MapCanvas(wxWindow, Publisher):
318          # if the mouse is outside the window.          # if the mouse is outside the window.
319          self.current_position = None          self.current_position = None
320    
         # 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  
   
321          # the bitmap serving as backing store          # the bitmap serving as backing store
322          self.bitmap = None          self.bitmap = None
323    
324          # the interactor          # the selection
325          self.interactor = interactor          self.selection = Selection()
326          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)
327    
328          # keep track of which layers/shapes are selected to make sure we          # keep track of which layers/shapes are selected to make sure we
329          # only redraw when necessary          # only redraw when necessary
# Line 303  class MapCanvas(wxWindow, Publisher): Line 337  class MapCanvas(wxWindow, Publisher):
337          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
338          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
339          wx.EVT_SIZE(self, self.OnSize)          wx.EVT_SIZE(self, self.OnSize)
         wx.EVT_IDLE(self, self.OnIdle)  
340    
341      def __del__(self):      def __del__(self):
342          wxWindow.__del__(self)          wxWindow.__del__(self)
343          Publisher.__del__(self)          Publisher.__del__(self)
344    
345        def Subscribe(self, channel, *args):
346            """Extend the inherited method to handle delegated messages.
347    
348            If channel is one of the delegated messages call the appropriate
349            object's Subscribe method. Otherwise just call the inherited
350            method.
351            """
352            if channel in self.delegated_messages:
353                object = getattr(self, self.delegated_messages[channel])
354                object.Subscribe(channel, *args)
355            else:
356                Publisher.Subscribe(self, channel, *args)
357    
358        def Unsubscribe(self, channel, *args):
359            """Extend the inherited method to handle delegated messages.
360    
361            If channel is one of the delegated messages call the appropriate
362            object's Unsubscribe method. Otherwise just call the inherited
363            method.
364            """
365            if channel in self.delegated_messages:
366                object = getattr(self, self.delegated_messages[channel])
367                object.Unsubscribe(channel, *args)
368            else:
369                Publisher.Unsubscribe(self, channel, *args)
370    
371        def __getattr__(self, attr):
372            if attr in self.delegated_methods:
373                return getattr(getattr(self, self.delegated_methods[attr]), attr)
374            raise AttributeError(attr)
375    
376      def OnPaint(self, event):      def OnPaint(self, event):
377          dc = wxPaintDC(self)          dc = wxPaintDC(self)
378          if self.map is not None and self.map.HasLayers():          clear = self.map is None or not self.map.HasLayers()
379              # We have a non-empty map. Redraw it in idle time  
380              self.redraw_on_idle = 1          wxBeginBusyCursor()
381          else:  
382            if not clear:
383                self.do_redraw()
384                try:
385                    pass
386                except:
387                    print "Error during drawing:", sys.exc_info()[0]
388                    clear = True
389    
390            if clear:
391              # 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
392              # the screen.              # the screen.
393    
# Line 326  class MapCanvas(wxWindow, Publisher): Line 399  class MapCanvas(wxWindow, Publisher):
399              dc.Clear()              dc.Clear()
400              dc.EndDrawing()              dc.EndDrawing()
401    
402            wxEndBusyCursor()
403    
404      def do_redraw(self):      def do_redraw(self):
405          # This should only be called if we have a non-empty map.          # This should only be called if we have a non-empty map.
406    
# Line 342  class MapCanvas(wxWindow, Publisher): Line 417  class MapCanvas(wxWindow, Publisher):
417              dc.BeginDrawing()              dc.BeginDrawing()
418    
419              # clear the background              # clear the background
420              dc.SetBrush(wx.wxWHITE_BRUSH)              #dc.SetBrush(wx.wxWHITE_BRUSH)
421              dc.SetPen(wx.wxTRANSPARENT_PEN)              #dc.SetPen(wx.wxTRANSPARENT_PEN)
422              dc.DrawRectangle(0, 0, width, height)              #dc.DrawRectangle(0, 0, width, height)
423                dc.SetBackground(wx.wxWHITE_BRUSH)
424              if 1: #self.interactor.selected_map is self.map:              dc.Clear()
425                  selected_layer = self.interactor.selected_layer  
426                  selected_shape = self.interactor.selected_shape              selected_layer = self.selection.SelectedLayer()
427              else:              selected_shapes = self.selection.SelectedShapes()
                 selected_layer = None  
                 selected_shape = None  
428    
429              # draw the map into the bitmap              # draw the map into the bitmap
430              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.scale, self.offset)
# Line 359  class MapCanvas(wxWindow, Publisher): Line 432  class MapCanvas(wxWindow, Publisher):
432              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
433              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
434              renderer.RenderMap(self.map, (0, 0, width, height),              renderer.RenderMap(self.map, (0, 0, width, height),
435                                 selected_layer, selected_shape)                                 selected_layer, selected_shapes)
436    
437              dc.EndDrawing()              dc.EndDrawing()
438              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
# Line 373  class MapCanvas(wxWindow, Publisher): Line 446  class MapCanvas(wxWindow, Publisher):
446          clientdc.Blit(0, 0, width, height, dc, 0, 0)          clientdc.Blit(0, 0, width, height, dc, 0, 0)
447          clientdc.EndDrawing()          clientdc.EndDrawing()
448    
449        def Export(self):
450            if self.scale == 0:
451                return
452    
453            if hasattr(self, "export_path"):
454                export_path = self.export_path
455            else:
456                export_path="."
457            dlg = wxFileDialog(self, _("Export Map"), export_path, "",
458                               "Enhanced Metafile (*.wmf)|*.wmf",
459                               wxSAVE|wxOVERWRITE_PROMPT)
460            if dlg.ShowModal() == wxID_OK:
461                self.export_path = os.path.dirname(dlg.GetPath())
462                dc = wxMetaFileDC(dlg.GetPath())
463        
464                scale, offset, mapregion = OutputTransform(self.scale,
465                                                           self.offset,
466                                                           self.GetSizeTuple(),
467                                                           dc.GetSizeTuple())
468    
469                selected_layer = self.selection.SelectedLayer()
470                selected_shapes = self.selection.SelectedShapes()
471    
472                renderer = ExportRenderer(dc, scale, offset)
473    
474                # Pass the entire bitmap as update region to the renderer.
475                # We're redrawing the whole bitmap, after all.
476                width, height = self.GetSizeTuple()
477                renderer.RenderMap(self.map,
478                                    (0,0,
479                                        (width/self.scale)*scale,
480                                        (height/self.scale)*scale),
481                                    mapregion,
482                                    selected_layer, selected_shapes)
483                dc.EndDrawing()
484                dc.Close()
485            dlg.Destroy()
486            
487      def Print(self):      def Print(self):
488          printer = wx.wxPrinter()          printer = wx.wxPrinter()
489          printout = MapPrintout(self.map)          width, height = self.GetSizeTuple()
490            selected_layer = self.selection.SelectedLayer()
491            selected_shapes = self.selection.SelectedShapes()
492            
493            printout = MapPrintout(self, self.map, (0, 0, width, height),
494                                   selected_layer, selected_shapes)
495          printer.Print(self, printout, wx.true)          printer.Print(self, printout, wx.true)
496          printout.Destroy()          printout.Destroy()
497    
498      def SetMap(self, map):      def SetMap(self, map):
499          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
500                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
501          if self.map is not None:          if self.map is not None:
502              for channel in redraw_channels:              for channel in redraw_channels:
# Line 388  class MapCanvas(wxWindow, Publisher): Line 504  class MapCanvas(wxWindow, Publisher):
504              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
505                                   self.projection_changed)                                   self.projection_changed)
506          self.map = map          self.map = map
507            self.selection.ClearSelection()
508          if self.map is not None:          if self.map is not None:
509              for channel in redraw_channels:              for channel in redraw_channels:
510                  self.map.Subscribe(channel, self.full_redraw)                  self.map.Subscribe(channel, self.full_redraw)
# Line 415  class MapCanvas(wxWindow, Publisher): Line 532  class MapCanvas(wxWindow, Publisher):
532    
533      def set_view_transform(self, scale, offset):      def set_view_transform(self, scale, offset):
534          self.scale = scale          self.scale = scale
535    
536          self.offset = offset          self.offset = offset
537          self.full_redraw()          self.full_redraw()
538            self.issue(SCALE_CHANGED, scale)
539    
540      def proj_to_win(self, x, y):      def proj_to_win(self, x, y):
541          """\          """\
542          Return the point in  window coords given by projected coordinates x y          Return the point in  window coords given by projected coordinates x y
543          """          """
544            if self.scale == 0:
545                return (0, 0)
546    
547          offx, offy = self.offset          offx, offy = self.offset
548          return (self.scale * x + offx, -self.scale * y + offy)          return (self.scale * x + offx, -self.scale * y + offy)
549    
# Line 429  class MapCanvas(wxWindow, Publisher): Line 551  class MapCanvas(wxWindow, Publisher):
551          """\          """\
552          Return the point in projected coordinates given by window coords x y          Return the point in projected coordinates given by window coords x y
553          """          """
554            if self.scale == 0:
555                return (0, 0)
556    
557          offx, offy = self.offset          offx, offy = self.offset
558          return ((x - offx) / self.scale, (offy - y) / self.scale)          return ((x - offx) / self.scale, (offy - y) / self.scale)
559    
560      def FitRectToWindow(self, rect):      def FitRectToWindow(self, rect):
561          """Fit the rectangular region given by rect into the window.          """Fit the rectangular region given by rect into the window.
562            
563          Set scale so that rect (in projected coordinates) just fits into          Set scale so that rect (in projected coordinates) just fits into
564          the window and center it.          the window and center it.
565          """          """
566          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
567          llx, lly, urx, ury = rect          llx, lly, urx, ury = rect
568          if llx == urx or lly == ury:          if llx == urx or lly == ury:
569              # zero with or zero height. Do Nothing              # zero width or zero height. Do Nothing
570              return              return
571          scalex = width / (urx - llx)          scalex = width / (urx - llx)
572          scaley = height / (ury - lly)          scaley = height / (ury - lly)
# Line 452  class MapCanvas(wxWindow, Publisher): Line 577  class MapCanvas(wxWindow, Publisher):
577    
578      def FitMapToWindow(self):      def FitMapToWindow(self):
579          """Fit the map to the window          """Fit the map to the window
580            
581          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
582          center it in the window.          center it in the window.
583          """          """
# Line 460  class MapCanvas(wxWindow, Publisher): Line 585  class MapCanvas(wxWindow, Publisher):
585          if bbox is not None:          if bbox is not None:
586              self.FitRectToWindow(bbox)              self.FitRectToWindow(bbox)
587    
588        def FitLayerToWindow(self, layer):
589            """Fit the given layer to the window.
590    
591            Set the scale so that the layer fits exactly into the window and
592            center it in the window.
593            """
594            
595            bbox = layer.LatLongBoundingBox()
596            if bbox is not None:
597                proj = self.map.GetProjection()
598                if proj is not None:
599                    bbox = proj.ForwardBBox(bbox)
600    
601                if bbox is not None:
602                    self.FitRectToWindow(bbox)
603    
604        def FitSelectedToWindow(self):
605            layer = self.selection.SelectedLayer()
606            shapes = self.selection.SelectedShapes()
607    
608            bbox = layer.ShapesBoundingBox(shapes)
609            if bbox is not None:
610                proj = self.map.GetProjection()
611                if proj is not None:
612                    bbox = proj.ForwardBBox(bbox)
613    
614                if bbox is not None:
615                    self.FitRectToWindow(bbox)
616    
617      def ZoomFactor(self, factor, center = None):      def ZoomFactor(self, factor, center = None):
618          """Multiply the zoom by factor and center on center.          """Multiply the zoom by factor and center on center.
619    
# Line 467  class MapCanvas(wxWindow, Publisher): Line 621  class MapCanvas(wxWindow, Publisher):
621          that should be centered. If it is omitted, it defaults to the          that should be centered. If it is omitted, it defaults to the
622          center of the window          center of the window
623          """          """
624          width, height = self.GetSizeTuple()          if self.scale > 0:
625          scale = self.scale * factor              width, height = self.GetSizeTuple()
626          offx, offy = self.offset              scale = self.scale * factor
627          if center is not None:              offx, offy = self.offset
628              cx, cy = center              if center is not None:
629          else:                  cx, cy = center
630              cx = width / 2              else:
631              cy = height / 2                  cx = width / 2
632          offset = (factor * (offx - cx) + width / 2,                  cy = height / 2
633                    factor * (offy - cy) + height / 2)              offset = (factor * (offx - cx) + width / 2,
634          self.set_view_transform(scale, offset)                      factor * (offy - cy) + height / 2)
635                self.set_view_transform(scale, offset)
636    
637      def ZoomOutToRect(self, rect):      def ZoomOutToRect(self, rect):
638          """Zoom out to fit the currently visible region into rect.          """Zoom out to fit the currently visible region into rect.
# Line 504  class MapCanvas(wxWindow, Publisher): Line 659  class MapCanvas(wxWindow, Publisher):
659          offx, offy = self.offset          offx, offy = self.offset
660          self.set_view_transform(self.scale, (offx + dx, offy + dy))          self.set_view_transform(self.scale, (offx + dx, offy + dy))
661    
662        def SelectTool(self, tool):
663            """Make tool the active tool.
664    
665            The parameter should be an instance of Tool or None to indicate
666            that no tool is active.
667            """
668            self.tool = tool
669    
670      def ZoomInTool(self):      def ZoomInTool(self):
671          """Start the zoom in tool"""          """Start the zoom in tool"""
672          self.tool = ZoomInTool(self)          self.SelectTool(ZoomInTool(self))
673    
674      def ZoomOutTool(self):      def ZoomOutTool(self):
675          """Start the zoom out tool"""          """Start the zoom out tool"""
676          self.tool = ZoomOutTool(self)          self.SelectTool(ZoomOutTool(self))
677    
678      def PanTool(self):      def PanTool(self):
679          """Start the pan tool"""          """Start the pan tool"""
680          self.tool = PanTool(self)          self.SelectTool(PanTool(self))
681            #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)
682            #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)
683            #print bmp
684            #img = wxImageFromBitmap(bmp)
685            #print img
686            #cur = wxCursor(img)
687            #print cur
688            #self.SetCursor(cur)
689    
690      def IdentifyTool(self):      def IdentifyTool(self):
691          """Start the identify tool"""          """Start the identify tool"""
692          self.tool = IdentifyTool(self)          self.SelectTool(IdentifyTool(self))
693    
694      def LabelTool(self):      def LabelTool(self):
695          """Start the label tool"""          """Start the label tool"""
696          self.tool = LabelTool(self)          self.SelectTool(LabelTool(self))
697    
698      def CurrentTool(self):      def CurrentTool(self):
699          """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 739  class MapCanvas(wxWindow, Publisher):
739          self.set_current_position(event)          self.set_current_position(event)
740          if self.dragging:          if self.dragging:
741              self.ReleaseMouse()              self.ReleaseMouse()
742              self.tool.Hide(self.drag_dc)              try:
743              self.tool.MouseUp(event)                  self.tool.Hide(self.drag_dc)
744              self.drag_dc = None                  self.tool.MouseUp(event)
745          self.dragging = 0              finally:
746                    self.drag_dc = None
747                    self.dragging = 0
748    
749      def OnMotion(self, event):      def OnMotion(self, event):
750          self.set_current_position(event)          self.set_current_position(event)
# Line 583  class MapCanvas(wxWindow, Publisher): Line 756  class MapCanvas(wxWindow, Publisher):
756      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
757          self.set_current_position(None)          self.set_current_position(None)
758    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
759      def OnSize(self, event):      def OnSize(self, event):
760          # 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
761          # 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 764  class MapCanvas(wxWindow, Publisher):
764          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
765          # could be reused.          # could be reused.
766          self.full_redraw()          self.full_redraw()
767            pass
768    
769      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
770          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
771            # The selection object takes care that it only issues
772          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
773          when necessary.          # actually changed, so we can do a full redraw unconditionally.
774          """          # FIXME: We should perhaps try to limit the redraw to the are
775          # A redraw is necessary when the display has to change, which          # actually covered by the shapes before and after the selection
776          # means that either the status changes from having no selection          # change.
777          # 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  
778    
779      def unprojected_rect_around_point(self, x, y):      def unprojected_rect_around_point(self, x, y, dist):
780          """return a rect a few pixels around (x, y) in unprojected corrdinates          """return a rect dist pixels around (x, y) in unprojected corrdinates
781    
782          The return value is a tuple (minx, miny, maxx, maxy) suitable a          The return value is a tuple (minx, miny, maxx, maxy) suitable a
783          parameter to a layer's ShapesInRegion method.          parameter to a layer's ShapesInRegion method.
# Line 633  class MapCanvas(wxWindow, Publisher): Line 791  class MapCanvas(wxWindow, Publisher):
791          xs = []          xs = []
792          ys = []          ys = []
793          for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):          for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):
794              px, py = self.win_to_proj(x + dx, y + dy)              px, py = self.win_to_proj(x + dist * dx, y + dist * dy)
795              if inverse:              if inverse:
796                  px, py = inverse(px, py)                  px, py = inverse(px, py)
797              xs.append(px)              xs.append(px)
# Line 660  class MapCanvas(wxWindow, Publisher): Line 818  class MapCanvas(wxWindow, Publisher):
818              forward = None              forward = None
819    
820          scale = self.scale          scale = self.scale
         offx, offy = self.offset  
821    
822          box = self.unprojected_rect_around_point(px, py)          if scale == 0:
823                return None, None
824    
825            offx, offy = self.offset
826    
827          if select_labels:          if select_labels:
828              labels = self.map.LabelLayer().Labels()              labels = self.map.LabelLayer().Labels()
# Line 710  class MapCanvas(wxWindow, Publisher): Line 870  class MapCanvas(wxWindow, Publisher):
870              if not layer.Visible():              if not layer.Visible():
871                  continue                  continue
872    
873              filled = layer.fill is not None              filled = layer.GetClassification().GetDefaultFill() \
874              stroked = layer.stroke is not None                       is not Color.Transparent
875                stroked = layer.GetClassification().GetDefaultLineColor() \
876                          is not Color.Transparent
877    
878              layer_proj = layer.projection              layer_proj = layer.projection
879              if layer_proj is not None:              if layer_proj is not None:
# Line 723  class MapCanvas(wxWindow, Publisher): Line 885  class MapCanvas(wxWindow, Publisher):
885    
886              select_shape = -1              select_shape = -1
887    
888                # Determine the ids of the shapes that overlap a tiny area
889                # around the point. For layers containing points we have to
890                # choose a larger size of the box we're testing agains so
891                # that we take the size of the markers into account
892                # FIXME: Once the markers are more flexible this part has to
893                # become more flexible too, of course
894                if shapetype == SHAPETYPE_POINT:
895                    box = self.unprojected_rect_around_point(px, py, 5)
896                else:
897                    box = self.unprojected_rect_around_point(px, py, 1)
898              shape_ids = layer.ShapesInRegion(box)              shape_ids = layer.ShapesInRegion(box)
899              shape_ids.reverse()              shape_ids.reverse()
900    
# Line 780  class MapCanvas(wxWindow, Publisher): Line 952  class MapCanvas(wxWindow, Publisher):
952          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
953          # the already selected layer again.          # the already selected layer again.
954          if layer is None:          if layer is None:
955              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
956          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
957            else:
958                shapes = [shape]
959            self.selection.SelectShapes(layer, shapes)
960          return result          return result
961    
962      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
# Line 839  class MapCanvas(wxWindow, Publisher): Line 1014  class MapCanvas(wxWindow, Publisher):
1014                      valign = ALIGN_CENTER                      valign = ALIGN_CENTER
1015                  label_layer.AddLabel(x, y, text,                  label_layer.AddLabel(x, y, text,
1016                                       halign = halign, valign = valign)                                       halign = halign, valign = valign)
1017    
1018    def OutputTransform(canvas_scale, canvas_offset, canvas_size, device_extend):
1019        """Calculate dimensions to transform canvas content to output device."""
1020        width, height = device_extend
1021    
1022        # Only 80 % of the with are available for the map
1023        width = width * 0.8
1024    
1025        # Define the distance of the map from DC border
1026        distance = 20
1027    
1028        if height < width:
1029            # landscape
1030            map_height = height - 2*distance
1031            map_width = map_height
1032        else:
1033            # portrait, recalibrate width (usually the legend width is too
1034            # small
1035            width = width * 0.9
1036            map_height = width - 2*distance
1037            map_width = map_height
1038        
1039        mapregion = (distance, distance,
1040                     distance+map_width, distance+map_height)
1041    
1042        canvas_width, canvas_height = canvas_size
1043        
1044        scalex = map_width / (canvas_width/canvas_scale)
1045        scaley = map_height / (canvas_height/canvas_scale)
1046        scale = min(scalex, scaley)
1047        canvas_offx, canvas_offy = canvas_offset
1048        offx = scale*canvas_offx/canvas_scale
1049        offy = scale*canvas_offy/canvas_scale
1050    
1051        return scale, (offx, offy), mapregion
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