/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 174 by bh, Wed May 15 13:30:00 2002 UTC revision 1035 by jan, Mon May 26 17:03:08 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  from renderer import ScreenRenderer, PrinterRender  import resource
47    
48    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 129  class ZoomInTool(RectTool): Line 145  class ZoomInTool(RectTool):
145              Tool.MouseUp(self, event)              Tool.MouseUp(self, event)
146              sx, sy = self.start              sx, sy = self.start
147              cx, cy = self.current              cx, cy = self.current
148              if sx == cx and sy == cy:              if sx == cx or sy == cy:
149                  # Just a mouse click. Simply zoom in by a factor of two                  # Just a mouse click or a degenerate rectangle. Simply
150                    # zoom in by a factor of two
151                    # FIXME: For a click this is the desired behavior but should we
152                    # really do this for degenrate rectagles as well or
153                    # should we ignore them?
154                  self.view.ZoomFactor(2, center = (cx, cy))                  self.view.ZoomFactor(2, center = (cx, cy))
155              else:              else:
156                  # A drag. Zoom in to the rectangle                  # A drag. Zoom in to the rectangle
# Line 140  class ZoomInTool(RectTool): Line 160  class ZoomInTool(RectTool):
160  class ZoomOutTool(RectTool):  class ZoomOutTool(RectTool):
161    
162      """The Zoom-Out Tool"""      """The Zoom-Out Tool"""
163        
164      def Name(self):      def Name(self):
165          return "ZoomOutTool"          return "ZoomOutTool"
166    
# Line 149  class ZoomOutTool(RectTool): Line 169  class ZoomOutTool(RectTool):
169              Tool.MouseUp(self, event)              Tool.MouseUp(self, event)
170              sx, sy = self.start              sx, sy = self.start
171              cx, cy = self.current              cx, cy = self.current
172              if sx == cx and sy == cy:              if sx == cx or sy == cy:
173                  # Just a mouse click. Simply zoom out by a factor of two                  # Just a mouse click or a degenerate rectangle. Simply
174                  self.view.ZoomFactor(0.5, center = (cy, cy))                  # zoom out by a factor of two.
175                    # FIXME: For a click this is the desired behavior but should we
176                    # really do this for degenrate rectagles as well or
177                    # should we ignore them?
178                    self.view.ZoomFactor(0.5, center = (cx, cy))
179              else:              else:
180                  # A drag. Zoom out to the rectangle                  # A drag. Zoom out to the rectangle
181                  self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),                  self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),
# Line 184  class PanTool(Tool): Line 208  class PanTool(Tool):
208              sx, sy = self.start              sx, sy = self.start
209              cx, cy = self.current              cx, cy = self.current
210              self.view.Translate(cx - sx, cy - sy)              self.view.Translate(cx - sx, cy - sy)
211            
212  class IdentifyTool(Tool):  class IdentifyTool(Tool):
213    
214      """The "Identify" Tool"""      """The "Identify" Tool"""
215        
216      def Name(self):      def Name(self):
217          return "IdentifyTool"          return "IdentifyTool"
218    
# Line 207  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 231  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 271  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 298  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              # update the region that has to be redrawn  
382              self.update_region.UnionRegion(self.GetUpdateRegion())          if not clear:
383          else:              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                
394              # XXX it's probably possible to get rid of this. The              # XXX it's probably possible to get rid of this. The
395              # background color of the window is already white and the              # background color of the window is already white and the
396              # only thing we may have to do is to call self.Refresh()              # only thing we may have to do is to call self.Refresh()
397              # with a true argument in the right places.              # with a true argument in the right places.
398              dc.BeginDrawing()              dc.BeginDrawing()
399              dc.Clear()                          dc.Clear()
400              dc.EndDrawing()              dc.EndDrawing()
401    
402              # clear the region          wxEndBusyCursor()
             self.update_region = wx.wxRegion()  
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 347  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 378  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          printout.Destroy()          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()
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 393  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 404  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 419  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 433  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.
562    
563            Set scale so that rect (in projected coordinates) just fits into
564            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 450  class MapCanvas(wxWindow, Publisher): Line 576  class MapCanvas(wxWindow, Publisher):
576          self.set_view_transform(scale, (offx, offy))          self.set_view_transform(scale, (offx, offy))
577    
578      def FitMapToWindow(self):      def FitMapToWindow(self):
579          """\          """Fit the map to the window
580          Set the scale and offset so that the map is centered in the  
581          window          Set the scale so that the map fits exactly into the window and
582            center it in the window.
583          """          """
584          bbox = self.map.ProjectedBoundingBox()          bbox = self.map.ProjectedBoundingBox()
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 465  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          # rect is given in window coordinates          """Zoom out to fit the currently visible region into rect.
639    
640            The rect parameter is given in window coordinates
641            """
642          # determine the bbox of the displayed region in projected          # determine the bbox of the displayed region in projected
643          # coordinates          # coordinates
644          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
# Line 496  class MapCanvas(wxWindow, Publisher): Line 655  class MapCanvas(wxWindow, Publisher):
655          self.set_view_transform(scale, (offx, offy))          self.set_view_transform(scale, (offx, offy))
656    
657      def Translate(self, dx, dy):      def Translate(self, dx, dy):
658            """Move the map by dx, dy pixels"""
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          self.tool = ZoomInTool(self)          """Start the zoom in tool"""
672            self.SelectTool(ZoomInTool(self))
673    
674      def ZoomOutTool(self):      def ZoomOutTool(self):
675          self.tool = ZoomOutTool(self)          """Start the zoom out tool"""
676            self.SelectTool(ZoomOutTool(self))
677    
678      def PanTool(self):      def PanTool(self):
679          self.tool = PanTool(self)          """Start the pan tool"""
680            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          self.tool = IdentifyTool(self)          """Start the identify tool"""
692            self.SelectTool(IdentifyTool(self))
693    
694      def LabelTool(self):      def LabelTool(self):
695          self.tool = LabelTool(self)          """Start the label tool"""
696            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"""
700          return self.tool and self.tool.Name() or None          return self.tool and self.tool.Name() or None
701    
702      def CurrentPosition(self):      def CurrentPosition(self):
# Line 552  class MapCanvas(wxWindow, Publisher): Line 734  class MapCanvas(wxWindow, Publisher):
734              self.tool.MouseDown(event)              self.tool.MouseDown(event)
735              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
736              self.dragging = 1              self.dragging = 1
737            
738      def OnLeftUp(self, event):      def OnLeftUp(self, event):
         self.ReleaseMouse()  
739          self.set_current_position(event)          self.set_current_position(event)
740          if self.dragging:          if self.dragging:
741              self.tool.Hide(self.drag_dc)              self.ReleaseMouse()
742              self.tool.MouseUp(event)              try:
743              self.drag_dc = None                  self.tool.Hide(self.drag_dc)
744          self.dragging = 0                  self.tool.MouseUp(event)
745                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 572  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 585  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).  
         print "MapCanvas.shape_selected:", layer, shape  
         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)):  
             print "MapCanvas.shape_selected: redraw",  
             self.full_redraw()  
         else:  
             print "MapCanvas.shape_selected: no redraw"  
         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 624  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)
798              ys.append(py)              ys.append(py)
799          return (min(xs), min(ys), max(xs), max(ys))          return (min(xs), min(ys), max(xs), max(ys))
800    
801      def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):      def find_shape_at(self, px, py, select_labels = 0, searched_layer = None):
802          """Determine the shape at point px, py in window coords          """Determine the shape at point px, py in window coords
803    
804          Return the shape and the corresponding layer as a tuple (layer,          Return the shape and the corresponding layer as a tuple (layer,
# Line 641  class MapCanvas(wxWindow, Publisher): Line 808  class MapCanvas(wxWindow, Publisher):
808          search through the labels. If a label is found return it's index          search through the labels. If a label is found return it's index
809          as the shape and None as the layer.          as the shape and None as the layer.
810    
811          If the optional parameter selected_layer is true (default), only          If the optional parameter searched_layer is given (or not None
812          search in the currently selected layer.          which it defaults to), only search in that layer.
813          """          """
814          map_proj = self.map.projection          map_proj = self.map.projection
815          if map_proj is not None:          if map_proj is not None:
# Line 651  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()
829                
830              if labels:              if labels:
831                  dc = wxClientDC(self)                  dc = wxClientDC(self)
832                  font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)                  font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
# Line 689  class MapCanvas(wxWindow, Publisher): Line 858  class MapCanvas(wxWindow, Publisher):
858                      if x <= px < x + width and y <= py <= y + height:                      if x <= px < x + width and y <= py <= y + height:
859                          return None, i                          return None, i
860    
861          if selected_layer:          if searched_layer:
862              layer = self.interactor.SelectedLayer()              layers = [searched_layer]
             if layer is not None:  
                 layers = [layer]  
             else:  
                 # no layer selected. Use an empty list to effectively  
                 # ignore all layers.  
                 layers = []  
863          else:          else:
864              layers = self.map.Layers()              layers = self.map.Layers()
865    
# Line 707  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:
880                  inverse = layer_proj.Inverse                  inverse = layer_proj.Inverse
881              else:              else:
882                  inverse = None                  inverse = None
883                    
884              shapetype = layer.ShapeType()              shapetype = layer.ShapeType()
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 762  class MapCanvas(wxWindow, Publisher): Line 937  class MapCanvas(wxWindow, Publisher):
937                  return layer, select_shape                  return layer, select_shape
938          return None, None          return None, None
939    
940      def SelectShapeAt(self, x, y):      def SelectShapeAt(self, x, y, layer = None):
941          layer, shape = self.find_shape_at(x, y, selected_layer = 0)          """\
942            Select and return the shape and its layer at window position (x, y)
943    
944            If layer is given, only search in that layer. If no layer is
945            given, search through all layers.
946    
947            Return a tuple (layer, shapeid). If no shape is found, return
948            (None, None).
949            """
950            layer, shape = result = self.find_shape_at(x, y, searched_layer=layer)
951          # If layer is None, then shape will also be None. We don't want          # If layer is None, then shape will also be None. We don't want
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
961    
962      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
963            """Add or remove a label at window position x, y.
964    
965            If there's a label at the given position, remove it. Otherwise
966            determine the shape at the position, run the label dialog and
967            unless the user cancels the dialog, add a laber.
968            """
969          ox = x; oy = y          ox = x; oy = y
970          label_layer = self.map.LabelLayer()          label_layer = self.map.LabelLayer()
971          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 820  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
Legend:
Removed from v.174  
changed lines
  Added in v.1035
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