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revision 301 by bh, Mon Sep 2 15:59:11 2002 UTC revision 1111 by bh, Fri May 30 09:54:48 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  
   
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:          try:
382              # If we've got no map or if the map is empty, simply clear              if not clear:
383              # the screen.                  self.do_redraw()
384                    try:
385              # XXX it's probably possible to get rid of this. The                      pass
386              # background color of the window is already white and the                  except:
387              # only thing we may have to do is to call self.Refresh()                      print "Error during drawing:", sys.exc_info()[0]
388              # with a true argument in the right places.                      clear = True
389              dc.BeginDrawing()  
390              dc.Clear()              if clear:
391              dc.EndDrawing()                  # 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.
# 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          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 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 414  class MapCanvas(wxWindow, Publisher): Line 531  class MapCanvas(wxWindow, Publisher):
531          self.full_redraw()          self.full_redraw()
532    
533      def set_view_transform(self, scale, offset):      def set_view_transform(self, scale, offset):
534            # width/height of the projected bbox
535            llx, lly, urx, ury = bbox = self.map.ProjectedBoundingBox()
536            pwidth = float(urx - llx)
537            pheight = float(ury - lly)
538    
539            # width/height of the window
540            wwidth, wheight = self.GetSizeTuple()
541    
542            # The window's center in projected coordinates assuming the new
543            # scale/offset
544            pcenterx = (wwidth/2 - offset[0]) / scale
545            pcentery = (offset[1] - wheight/2) / scale
546    
547            # The window coordinates used when drawing the shapes must fit
548            # into 16bit signed integers.
549            max_len = max(pwidth, pheight)
550            if max_len:
551                max_scale = 32000.0 / max_len
552            else:
553                # FIXME: What to do in this case? The bbox is effectively
554                # empty so any scale should work.
555                max_scale = scale
556    
557            # The minimal scale is somewhat arbitrarily set to half that of
558            # the bbox fit into the window
559            scales = []
560            if pwidth:
561                scales.append(wwidth / pwidth)
562            if pheight:
563                scales.append(wheight / pheight)
564            if scales:
565                min_scale = 0.5 * min(scales)
566            else:
567                min_scale = scale
568    
569            if scale > max_scale:
570                scale = max_scale
571            elif scale < min_scale:
572                scale = min_scale
573    
574          self.scale = scale          self.scale = scale
575          self.offset = offset  
576            # determine new offset to preserve the center
577            self.offset = (wwidth/2 - scale * pcenterx,
578                           wheight/2 + scale * pcentery)
579          self.full_redraw()          self.full_redraw()
580            self.issue(SCALE_CHANGED, scale)
581    
582      def proj_to_win(self, x, y):      def proj_to_win(self, x, y):
583          """\          """\
584          Return the point in  window coords given by projected coordinates x y          Return the point in  window coords given by projected coordinates x y
585          """          """
586            if self.scale == 0:
587                return (0, 0)
588    
589          offx, offy = self.offset          offx, offy = self.offset
590          return (self.scale * x + offx, -self.scale * y + offy)          return (self.scale * x + offx, -self.scale * y + offy)
591    
# Line 429  class MapCanvas(wxWindow, Publisher): Line 593  class MapCanvas(wxWindow, Publisher):
593          """\          """\
594          Return the point in projected coordinates given by window coords x y          Return the point in projected coordinates given by window coords x y
595          """          """
596            if self.scale == 0:
597                return (0, 0)
598    
599          offx, offy = self.offset          offx, offy = self.offset
600          return ((x - offx) / self.scale, (offy - y) / self.scale)          return ((x - offx) / self.scale, (offy - y) / self.scale)
601    
602      def FitRectToWindow(self, rect):      def FitRectToWindow(self, rect):
603          """Fit the rectangular region given by rect into the window.          """Fit the rectangular region given by rect into the window.
604            
605          Set scale so that rect (in projected coordinates) just fits into          Set scale so that rect (in projected coordinates) just fits into
606          the window and center it.          the window and center it.
607          """          """
608          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
609          llx, lly, urx, ury = rect          llx, lly, urx, ury = rect
610          if llx == urx or lly == ury:          if llx == urx or lly == ury:
611              # zero with or zero height. Do Nothing              # zero width or zero height. Do Nothing
612              return              return
613          scalex = width / (urx - llx)          scalex = width / (urx - llx)
614          scaley = height / (ury - lly)          scaley = height / (ury - lly)
# Line 452  class MapCanvas(wxWindow, Publisher): Line 619  class MapCanvas(wxWindow, Publisher):
619    
620      def FitMapToWindow(self):      def FitMapToWindow(self):
621          """Fit the map to the window          """Fit the map to the window
622            
623          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
624          center it in the window.          center it in the window.
625          """          """
# Line 460  class MapCanvas(wxWindow, Publisher): Line 627  class MapCanvas(wxWindow, Publisher):
627          if bbox is not None:          if bbox is not None:
628              self.FitRectToWindow(bbox)              self.FitRectToWindow(bbox)
629    
630        def FitLayerToWindow(self, layer):
631            """Fit the given layer to the window.
632    
633            Set the scale so that the layer fits exactly into the window and
634            center it in the window.
635            """
636            
637            bbox = layer.LatLongBoundingBox()
638            if bbox is not None:
639                proj = self.map.GetProjection()
640                if proj is not None:
641                    bbox = proj.ForwardBBox(bbox)
642    
643                if bbox is not None:
644                    self.FitRectToWindow(bbox)
645    
646        def FitSelectedToWindow(self):
647            layer = self.selection.SelectedLayer()
648            shapes = self.selection.SelectedShapes()
649    
650            bbox = layer.ShapesBoundingBox(shapes)
651            if bbox is not None:
652                proj = self.map.GetProjection()
653                if proj is not None:
654                    bbox = proj.ForwardBBox(bbox)
655    
656                if bbox is not None:
657                    if len(shapes) == 1 and layer.ShapeType() == SHAPETYPE_POINT:
658                        self.ZoomFactor(1, self.proj_to_win(bbox[0], bbox[1]))
659                    else:
660                        self.FitRectToWindow(bbox)
661    
662      def ZoomFactor(self, factor, center = None):      def ZoomFactor(self, factor, center = None):
663          """Multiply the zoom by factor and center on center.          """Multiply the zoom by factor and center on center.
664    
# Line 467  class MapCanvas(wxWindow, Publisher): Line 666  class MapCanvas(wxWindow, Publisher):
666          that should be centered. If it is omitted, it defaults to the          that should be centered. If it is omitted, it defaults to the
667          center of the window          center of the window
668          """          """
669          width, height = self.GetSizeTuple()          if self.scale > 0:
670          scale = self.scale * factor              width, height = self.GetSizeTuple()
671          offx, offy = self.offset              scale = self.scale * factor
672          if center is not None:              offx, offy = self.offset
673              cx, cy = center              if center is not None:
674          else:                  cx, cy = center
675              cx = width / 2              else:
676              cy = height / 2                  cx = width / 2
677          offset = (factor * (offx - cx) + width / 2,                  cy = height / 2
678                    factor * (offy - cy) + height / 2)              offset = (factor * (offx - cx) + width / 2,
679          self.set_view_transform(scale, offset)                      factor * (offy - cy) + height / 2)
680                self.set_view_transform(scale, offset)
681    
682      def ZoomOutToRect(self, rect):      def ZoomOutToRect(self, rect):
683          """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 704  class MapCanvas(wxWindow, Publisher):
704          offx, offy = self.offset          offx, offy = self.offset
705          self.set_view_transform(self.scale, (offx + dx, offy + dy))          self.set_view_transform(self.scale, (offx + dx, offy + dy))
706    
707        def SelectTool(self, tool):
708            """Make tool the active tool.
709    
710            The parameter should be an instance of Tool or None to indicate
711            that no tool is active.
712            """
713            self.tool = tool
714    
715      def ZoomInTool(self):      def ZoomInTool(self):
716          """Start the zoom in tool"""          """Start the zoom in tool"""
717          self.tool = ZoomInTool(self)          self.SelectTool(ZoomInTool(self))
718    
719      def ZoomOutTool(self):      def ZoomOutTool(self):
720          """Start the zoom out tool"""          """Start the zoom out tool"""
721          self.tool = ZoomOutTool(self)          self.SelectTool(ZoomOutTool(self))
722    
723      def PanTool(self):      def PanTool(self):
724          """Start the pan tool"""          """Start the pan tool"""
725          self.tool = PanTool(self)          self.SelectTool(PanTool(self))
726            #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)
727            #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)
728            #print bmp
729            #img = wxImageFromBitmap(bmp)
730            #print img
731            #cur = wxCursor(img)
732            #print cur
733            #self.SetCursor(cur)
734    
735      def IdentifyTool(self):      def IdentifyTool(self):
736          """Start the identify tool"""          """Start the identify tool"""
737          self.tool = IdentifyTool(self)          self.SelectTool(IdentifyTool(self))
738    
739      def LabelTool(self):      def LabelTool(self):
740          """Start the label tool"""          """Start the label tool"""
741          self.tool = LabelTool(self)          self.SelectTool(LabelTool(self))
742    
743      def CurrentTool(self):      def CurrentTool(self):
744          """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 784  class MapCanvas(wxWindow, Publisher):
784          self.set_current_position(event)          self.set_current_position(event)
785          if self.dragging:          if self.dragging:
786              self.ReleaseMouse()              self.ReleaseMouse()
787              self.tool.Hide(self.drag_dc)              try:
788              self.tool.MouseUp(event)                  self.tool.Hide(self.drag_dc)
789              self.drag_dc = None                  self.tool.MouseUp(event)
790          self.dragging = 0              finally:
791                    self.drag_dc = None
792                    self.dragging = 0
793    
794      def OnMotion(self, event):      def OnMotion(self, event):
795          self.set_current_position(event)          self.set_current_position(event)
# Line 583  class MapCanvas(wxWindow, Publisher): Line 801  class MapCanvas(wxWindow, Publisher):
801      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
802          self.set_current_position(None)          self.set_current_position(None)
803    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
804      def OnSize(self, event):      def OnSize(self, event):
805          # 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
806          # 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 809  class MapCanvas(wxWindow, Publisher):
809          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
810          # could be reused.          # could be reused.
811          self.full_redraw()          self.full_redraw()
812            pass
813    
814      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
815          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
816            # The selection object takes care that it only issues
817          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
818          when necessary.          # actually changed, so we can do a full redraw unconditionally.
819          """          # FIXME: We should perhaps try to limit the redraw to the are
820          # A redraw is necessary when the display has to change, which          # actually covered by the shapes before and after the selection
821          # means that either the status changes from having no selection          # change.
822          # 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  
823    
824      def unprojected_rect_around_point(self, x, y, dist):      def unprojected_rect_around_point(self, x, y, dist):
825          """return a rect dist pixels around (x, y) in unprojected corrdinates          """return a rect dist pixels around (x, y) in unprojected corrdinates
# Line 660  class MapCanvas(wxWindow, Publisher): Line 863  class MapCanvas(wxWindow, Publisher):
863              forward = None              forward = None
864    
865          scale = self.scale          scale = self.scale
866    
867            if scale == 0:
868                return None, None
869    
870          offx, offy = self.offset          offx, offy = self.offset
871    
872          if select_labels:          if select_labels:
# Line 708  class MapCanvas(wxWindow, Publisher): Line 915  class MapCanvas(wxWindow, Publisher):
915              if not layer.Visible():              if not layer.Visible():
916                  continue                  continue
917    
918              filled = layer.fill is not None              filled = layer.GetClassification().GetDefaultFill() \
919              stroked = layer.stroke is not None                       is not Color.Transparent
920                stroked = layer.GetClassification().GetDefaultLineColor() \
921                          is not Color.Transparent
922    
923              layer_proj = layer.projection              layer_proj = layer.projection
924              if layer_proj is not None:              if layer_proj is not None:
# Line 788  class MapCanvas(wxWindow, Publisher): Line 997  class MapCanvas(wxWindow, Publisher):
997          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
998          # the already selected layer again.          # the already selected layer again.
999          if layer is None:          if layer is None:
1000              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
1001          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
1002            else:
1003                shapes = [shape]
1004            self.selection.SelectShapes(layer, shapes)
1005          return result          return result
1006    
1007      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
# Line 847  class MapCanvas(wxWindow, Publisher): Line 1059  class MapCanvas(wxWindow, Publisher):
1059                      valign = ALIGN_CENTER                      valign = ALIGN_CENTER
1060                  label_layer.AddLabel(x, y, text,                  label_layer.AddLabel(x, y, text,
1061                                       halign = halign, valign = valign)                                       halign = halign, valign = valign)
1062    
1063    def OutputTransform(canvas_scale, canvas_offset, canvas_size, device_extend):
1064        """Calculate dimensions to transform canvas content to output device."""
1065        width, height = device_extend
1066    
1067        # Only 80 % of the with are available for the map
1068        width = width * 0.8
1069    
1070        # Define the distance of the map from DC border
1071        distance = 20
1072    
1073        if height < width:
1074            # landscape
1075            map_height = height - 2*distance
1076            map_width = map_height
1077        else:
1078            # portrait, recalibrate width (usually the legend width is too
1079            # small
1080            width = width * 0.9
1081            map_height = width - 2*distance
1082            map_width = map_height
1083        
1084        mapregion = (distance, distance,
1085                     distance+map_width, distance+map_height)
1086    
1087        canvas_width, canvas_height = canvas_size
1088        
1089        scalex = map_width / (canvas_width/canvas_scale)
1090        scaley = map_height / (canvas_height/canvas_scale)
1091        scale = min(scalex, scaley)
1092        canvas_offx, canvas_offy = canvas_offset
1093        offx = scale*canvas_offx/canvas_scale
1094        offy = scale*canvas_offy/canvas_scale
1095    
1096        return scale, (offx, offy), mapregion
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