/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 293 by bh, Fri Aug 30 10:18:50 2002 UTC revision 1105 by jonathan, Fri May 30 06:30:15 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          return wx.true          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 True
275    
276    
277  class MapCanvas(wxWindow, Publisher):  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  
   
         # The region to update when idle  
         self.update_region = wx.wxRegion()  
   
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 306  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 OnPaint(self, event):      def Subscribe(self, channel, *args):
346          dc = wxPaintDC(self)          """Extend the inherited method to handle delegated messages.
347          if self.map is not None and self.map.HasLayers():  
348              # We have a non-empty map. Redraw it in idle time          If channel is one of the delegated messages call the appropriate
349              self.redraw_on_idle = 1          object's Subscribe method. Otherwise just call the inherited
350              # update the region that has to be redrawn          method.
351              self.update_region.UnionRegion(self.GetUpdateRegion())          """
352            if channel in self.delegated_messages:
353                object = getattr(self, self.delegated_messages[channel])
354                object.Subscribe(channel, *args)
355          else:          else:
356              # If we've got no map or if the map is empty, simply clear              Publisher.Subscribe(self, channel, *args)
             # the screen.  
357    
358              # XXX it's probably possible to get rid of this. The      def Unsubscribe(self, channel, *args):
359              # background color of the window is already white and the          """Extend the inherited method to handle delegated messages.
360              # only thing we may have to do is to call self.Refresh()  
361              # with a true argument in the right places.          If channel is one of the delegated messages call the appropriate
362              dc.BeginDrawing()          object's Unsubscribe method. Otherwise just call the inherited
363              dc.Clear()          method.
364              dc.EndDrawing()          """
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              # clear the region      def __getattr__(self, attr):
372              self.update_region = wx.wxRegion()          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):
377            dc = wxPaintDC(self)
378            clear = self.map is None or not self.map.HasLayers()
379    
380            wxBeginBusyCursor()
381            try:
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
392                    # the screen.
393    
394                    # XXX it's probably possible to get rid of this. The
395                    # background color of the window is already white and the
396                    # only thing we may have to do is to call self.Refresh()
397                    # with a true argument in the right places.
398                    dc.BeginDrawing()
399                    dc.Clear()
400                    dc.EndDrawing()
401            finally:
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    
         # get the update region and reset it. We're not actually using  
         # it anymore, though.  
         update_box = self.update_region.GetBox()  
         self.update_region = wx.wxRegion()  
   
407          # Get the window size.          # Get the window size.
408          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
409    
# Line 355  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)
431    
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 386  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          printer.Print(self, printout, wx.true)          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, 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 401  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 412  class MapCanvas(wxWindow, Publisher): Line 516  class MapCanvas(wxWindow, Publisher):
516          self.full_redraw()          self.full_redraw()
517    
518      def Map(self):      def Map(self):
519            """Return the map displayed by this canvas"""
520          return self.map          return self.map
521    
522      def redraw(self, *args):      def redraw(self, *args):
# Line 427  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 441  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 464  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 472  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                    if len(shapes) == 1 and layer.ShapeType() == SHAPETYPE_POINT:
616                        self.ZoomFactor(1, self.proj_to_win(bbox[0], bbox[1]))
617                    else:
618                        self.FitRectToWindow(bbox)
619    
620      def ZoomFactor(self, factor, center = None):      def ZoomFactor(self, factor, center = None):
621          """Multiply the zoom by factor and center on center.          """Multiply the zoom by factor and center on center.
622    
# Line 479  class MapCanvas(wxWindow, Publisher): Line 624  class MapCanvas(wxWindow, Publisher):
624          that should be centered. If it is omitted, it defaults to the          that should be centered. If it is omitted, it defaults to the
625          center of the window          center of the window
626          """          """
627          width, height = self.GetSizeTuple()          if self.scale > 0:
628          scale = self.scale * factor              width, height = self.GetSizeTuple()
629          offx, offy = self.offset              scale = self.scale * factor
630          if center is not None:              offx, offy = self.offset
631              cx, cy = center              if center is not None:
632          else:                  cx, cy = center
633              cx = width / 2              else:
634              cy = height / 2                  cx = width / 2
635          offset = (factor * (offx - cx) + width / 2,                  cy = height / 2
636                    factor * (offy - cy) + height / 2)              offset = (factor * (offx - cx) + width / 2,
637          self.set_view_transform(scale, offset)                      factor * (offy - cy) + height / 2)
638                self.set_view_transform(scale, offset)
639    
640      def ZoomOutToRect(self, rect):      def ZoomOutToRect(self, rect):
641          """Zoom out to fit the currently visible region into rect.          """Zoom out to fit the currently visible region into rect.
# Line 512  class MapCanvas(wxWindow, Publisher): Line 658  class MapCanvas(wxWindow, Publisher):
658          self.set_view_transform(scale, (offx, offy))          self.set_view_transform(scale, (offx, offy))
659    
660      def Translate(self, dx, dy):      def Translate(self, dx, dy):
661            """Move the map by dx, dy pixels"""
662          offx, offy = self.offset          offx, offy = self.offset
663          self.set_view_transform(self.scale, (offx + dx, offy + dy))          self.set_view_transform(self.scale, (offx + dx, offy + dy))
664    
665        def SelectTool(self, tool):
666            """Make tool the active tool.
667    
668            The parameter should be an instance of Tool or None to indicate
669            that no tool is active.
670            """
671            self.tool = tool
672    
673      def ZoomInTool(self):      def ZoomInTool(self):
674          self.tool = ZoomInTool(self)          """Start the zoom in tool"""
675            self.SelectTool(ZoomInTool(self))
676    
677      def ZoomOutTool(self):      def ZoomOutTool(self):
678          self.tool = ZoomOutTool(self)          """Start the zoom out tool"""
679            self.SelectTool(ZoomOutTool(self))
680    
681      def PanTool(self):      def PanTool(self):
682          self.tool = PanTool(self)          """Start the pan tool"""
683            self.SelectTool(PanTool(self))
684            #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)
685            #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)
686            #print bmp
687            #img = wxImageFromBitmap(bmp)
688            #print img
689            #cur = wxCursor(img)
690            #print cur
691            #self.SetCursor(cur)
692    
693      def IdentifyTool(self):      def IdentifyTool(self):
694          self.tool = IdentifyTool(self)          """Start the identify tool"""
695            self.SelectTool(IdentifyTool(self))
696    
697      def LabelTool(self):      def LabelTool(self):
698          self.tool = LabelTool(self)          """Start the label tool"""
699            self.SelectTool(LabelTool(self))
700    
701      def CurrentTool(self):      def CurrentTool(self):
702            """Return the name of the current tool or None if no tool is active"""
703          return self.tool and self.tool.Name() or None          return self.tool and self.tool.Name() or None
704    
705      def CurrentPosition(self):      def CurrentPosition(self):
# Line 573  class MapCanvas(wxWindow, Publisher): Line 742  class MapCanvas(wxWindow, Publisher):
742          self.set_current_position(event)          self.set_current_position(event)
743          if self.dragging:          if self.dragging:
744              self.ReleaseMouse()              self.ReleaseMouse()
745              self.tool.Hide(self.drag_dc)              try:
746              self.tool.MouseUp(event)                  self.tool.Hide(self.drag_dc)
747              self.drag_dc = None                  self.tool.MouseUp(event)
748          self.dragging = 0              finally:
749                    self.drag_dc = None
750                    self.dragging = 0
751    
752      def OnMotion(self, event):      def OnMotion(self, event):
753          self.set_current_position(event)          self.set_current_position(event)
# Line 588  class MapCanvas(wxWindow, Publisher): Line 759  class MapCanvas(wxWindow, Publisher):
759      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
760          self.set_current_position(None)          self.set_current_position(None)
761    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
762      def OnSize(self, event):      def OnSize(self, event):
763          # 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
764          # 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 601  class MapCanvas(wxWindow, Publisher): Line 767  class MapCanvas(wxWindow, Publisher):
767          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
768          # could be reused.          # could be reused.
769          self.full_redraw()          self.full_redraw()
770            pass
771    
772      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
773          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
774            # The selection object takes care that it only issues
775          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
776          when necessary.          # actually changed, so we can do a full redraw unconditionally.
777          """          # FIXME: We should perhaps try to limit the redraw to the are
778          # A redraw is necessary when the display has to change, which          # actually covered by the shapes before and after the selection
779          # means that either the status changes from having no selection          # change.
780          # 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  
781    
782      def unprojected_rect_around_point(self, x, y):      def unprojected_rect_around_point(self, x, y, dist):
783          """return a rect a few pixels around (x, y) in unprojected corrdinates          """return a rect dist pixels around (x, y) in unprojected corrdinates
784    
785          The return value is a tuple (minx, miny, maxx, maxy) suitable a          The return value is a tuple (minx, miny, maxx, maxy) suitable a
786          parameter to a layer's ShapesInRegion method.          parameter to a layer's ShapesInRegion method.
# Line 638  class MapCanvas(wxWindow, Publisher): Line 794  class MapCanvas(wxWindow, Publisher):
794          xs = []          xs = []
795          ys = []          ys = []
796          for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):          for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):
797              px, py = self.win_to_proj(x + dx, y + dy)              px, py = self.win_to_proj(x + dist * dx, y + dist * dy)
798              if inverse:              if inverse:
799                  px, py = inverse(px, py)                  px, py = inverse(px, py)
800              xs.append(px)              xs.append(px)
# Line 665  class MapCanvas(wxWindow, Publisher): Line 821  class MapCanvas(wxWindow, Publisher):
821              forward = None              forward = None
822    
823          scale = self.scale          scale = self.scale
         offx, offy = self.offset  
824    
825          box = self.unprojected_rect_around_point(px, py)          if scale == 0:
826                return None, None
827    
828            offx, offy = self.offset
829    
830          if select_labels:          if select_labels:
831              labels = self.map.LabelLayer().Labels()              labels = self.map.LabelLayer().Labels()
# Line 715  class MapCanvas(wxWindow, Publisher): Line 873  class MapCanvas(wxWindow, Publisher):
873              if not layer.Visible():              if not layer.Visible():
874                  continue                  continue
875    
876              filled = layer.fill is not None              filled = layer.GetClassification().GetDefaultFill() \
877              stroked = layer.stroke is not None                       is not Color.Transparent
878                stroked = layer.GetClassification().GetDefaultLineColor() \
879                          is not Color.Transparent
880    
881              layer_proj = layer.projection              layer_proj = layer.projection
882              if layer_proj is not None:              if layer_proj is not None:
# Line 728  class MapCanvas(wxWindow, Publisher): Line 888  class MapCanvas(wxWindow, Publisher):
888    
889              select_shape = -1              select_shape = -1
890    
891                # Determine the ids of the shapes that overlap a tiny area
892                # around the point. For layers containing points we have to
893                # choose a larger size of the box we're testing agains so
894                # that we take the size of the markers into account
895                # FIXME: Once the markers are more flexible this part has to
896                # become more flexible too, of course
897                if shapetype == SHAPETYPE_POINT:
898                    box = self.unprojected_rect_around_point(px, py, 5)
899                else:
900                    box = self.unprojected_rect_around_point(px, py, 1)
901              shape_ids = layer.ShapesInRegion(box)              shape_ids = layer.ShapesInRegion(box)
902              shape_ids.reverse()              shape_ids.reverse()
903    
# Line 785  class MapCanvas(wxWindow, Publisher): Line 955  class MapCanvas(wxWindow, Publisher):
955          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
956          # the already selected layer again.          # the already selected layer again.
957          if layer is None:          if layer is None:
958              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
959          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
960            else:
961                shapes = [shape]
962            self.selection.SelectShapes(layer, shapes)
963          return result          return result
964    
965      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
966            """Add or remove a label at window position x, y.
967    
968            If there's a label at the given position, remove it. Otherwise
969            determine the shape at the position, run the label dialog and
970            unless the user cancels the dialog, add a laber.
971            """
972          ox = x; oy = y          ox = x; oy = y
973          label_layer = self.map.LabelLayer()          label_layer = self.map.LabelLayer()
974          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
# Line 838  class MapCanvas(wxWindow, Publisher): Line 1017  class MapCanvas(wxWindow, Publisher):
1017                      valign = ALIGN_CENTER                      valign = ALIGN_CENTER
1018                  label_layer.AddLabel(x, y, text,                  label_layer.AddLabel(x, y, text,
1019                                       halign = halign, valign = valign)                                       halign = halign, valign = valign)
1020    
1021    def OutputTransform(canvas_scale, canvas_offset, canvas_size, device_extend):
1022        """Calculate dimensions to transform canvas content to output device."""
1023        width, height = device_extend
1024    
1025        # Only 80 % of the with are available for the map
1026        width = width * 0.8
1027    
1028        # Define the distance of the map from DC border
1029        distance = 20
1030    
1031        if height < width:
1032            # landscape
1033            map_height = height - 2*distance
1034            map_width = map_height
1035        else:
1036            # portrait, recalibrate width (usually the legend width is too
1037            # small
1038            width = width * 0.9
1039            map_height = width - 2*distance
1040            map_width = map_height
1041        
1042        mapregion = (distance, distance,
1043                     distance+map_width, distance+map_height)
1044    
1045        canvas_width, canvas_height = canvas_size
1046        
1047        scalex = map_width / (canvas_width/canvas_scale)
1048        scaley = map_height / (canvas_height/canvas_scale)
1049        scale = min(scalex, scaley)
1050        canvas_offx, canvas_offy = canvas_offset
1051        offx = scale*canvas_offx/canvas_scale
1052        offy = scale*canvas_offy/canvas_scale
1053    
1054        return scale, (offx, offy), mapregion
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