/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
ViewVC logotype

Diff of /branches/WIP-pyshapelib-bramz/Thuban/UI/view.py

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 125 by bh, Thu May 2 18:55:33 2002 UTC revision 855 by frank, Wed May 7 18:24:27 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  #  #
# Line 11  Classes for display of a map and interac Line 11  Classes for display of a map and interac
11    
12  __version__ = "$Revision$"  __version__ = "$Revision$"
13    
14    import sys
15    
16  from math import hypot  from math import hypot
17    
18  from wxPython.wx import wxWindow,\  from wxPython.wx import wxWindow,\
19       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
20       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, \
21         wxBITMAP_TYPE_XPM, wxBeginBusyCursor, wxEndBusyCursor, wxCursor, \
22         wxImageFromBitmap
23    
24    
25  from wxPython import wx  from wxPython import wx
# Line 24  from wxproj import point_in_polygon_shap Line 28  from wxproj import point_in_polygon_shap
28    
29    
30  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \
31       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED       MAP_LAYERS_CHANGED, LAYER_CHANGED, LAYER_VISIBILITY_CHANGED
32  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
33       SHAPETYPE_POINT       SHAPETYPE_POINT
34  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
35       ALIGN_LEFT, ALIGN_RIGHT       ALIGN_LEFT, ALIGN_RIGHT
36  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
37    from Thuban.Model.color import Color
38    
39    import resource
40    
41    from selection import Selection
42  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, PrinterRender
43    
44  import labeldialog  import labeldialog
45    
46  from messages import SELECTED_SHAPE, VIEW_POSITION  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION, \
47                         SCALE_CHANGED
48    
49    
50  #  #
# Line 129  class ZoomInTool(RectTool): Line 138  class ZoomInTool(RectTool):
138              Tool.MouseUp(self, event)              Tool.MouseUp(self, event)
139              sx, sy = self.start              sx, sy = self.start
140              cx, cy = self.current              cx, cy = self.current
141              if sx == cx and sy == cy:              if sx == cx or sy == cy:
142                  # Just a mouse click. Simply zoom in by a factor of two                  # Just a mouse click or a degenerate rectangle. Simply
143                    # zoom in by a factor of two
144                    # FIXME: For a click this is the desired behavior but should we
145                    # really do this for degenrate rectagles as well or
146                    # should we ignore them?
147                  self.view.ZoomFactor(2, center = (cx, cy))                  self.view.ZoomFactor(2, center = (cx, cy))
148              else:              else:
149                  # A drag. Zoom in to the rectangle                  # A drag. Zoom in to the rectangle
# Line 140  class ZoomInTool(RectTool): Line 153  class ZoomInTool(RectTool):
153  class ZoomOutTool(RectTool):  class ZoomOutTool(RectTool):
154    
155      """The Zoom-Out Tool"""      """The Zoom-Out Tool"""
156        
157      def Name(self):      def Name(self):
158          return "ZoomOutTool"          return "ZoomOutTool"
159    
# Line 149  class ZoomOutTool(RectTool): Line 162  class ZoomOutTool(RectTool):
162              Tool.MouseUp(self, event)              Tool.MouseUp(self, event)
163              sx, sy = self.start              sx, sy = self.start
164              cx, cy = self.current              cx, cy = self.current
165              if sx == cx and sy == cy:              if sx == cx or sy == cy:
166                  # Just a mouse click. Simply zoom out by a factor of two                  # Just a mouse click or a degenerate rectangle. Simply
167                  self.view.ZoomFactor(0.5, center = (cy, cy))                  # zoom out by a factor of two.
168                    # FIXME: For a click this is the desired behavior but should we
169                    # really do this for degenrate rectagles as well or
170                    # should we ignore them?
171                    self.view.ZoomFactor(0.5, center = (cx, cy))
172              else:              else:
173                  # A drag. Zoom out to the rectangle                  # A drag. Zoom out to the rectangle
174                  self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),                  self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),
# Line 167  class PanTool(Tool): Line 184  class PanTool(Tool):
184    
185      def MouseMove(self, event):      def MouseMove(self, event):
186          if self.dragging:          if self.dragging:
             x0, y0 = self.current  
187              Tool.MouseMove(self, event)              Tool.MouseMove(self, event)
188                sx, sy = self.start
189              x, y = self.current              x, y = self.current
190              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
191    
192                bitmapdc = wx.wxMemoryDC()
193                bitmapdc.SelectObject(self.view.bitmap)
194    
195              dc = self.view.drag_dc              dc = self.view.drag_dc
196              dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y)              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
197    
198      def MouseUp(self, event):      def MouseUp(self, event):
199          if self.dragging:          if self.dragging:
# Line 180  class PanTool(Tool): Line 201  class PanTool(Tool):
201              sx, sy = self.start              sx, sy = self.start
202              cx, cy = self.current              cx, cy = self.current
203              self.view.Translate(cx - sx, cy - sy)              self.view.Translate(cx - sx, cy - sy)
204            
205  class IdentifyTool(Tool):  class IdentifyTool(Tool):
206    
207      """The "Identify" Tool"""      """The "Identify" Tool"""
208        
209      def Name(self):      def Name(self):
210          return "IdentifyTool"          return "IdentifyTool"
211    
# Line 238  class MapPrintout(wx.wxPrintout): Line 259  class MapPrintout(wx.wxPrintout):
259          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)
260          renderer.RenderMap(self.map)          renderer.RenderMap(self.map)
261          return wx.true          return wx.true
262            
263    
264  class MapCanvas(wxWindow, Publisher):  class MapCanvas(wxWindow, Publisher):
265    
266      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
267    
268      def __init__(self, parent, winid, interactor):      # Some messages that can be subscribed/unsubscribed directly through
269        # the MapCanvas come in fact from other objects. This is a dict
270        # mapping those messages to the names of the instance variables they
271        # actually come from. The delegation is implemented in the Subscribe
272        # and Unsubscribe methods
273        delegated_messages = {LAYER_SELECTED: "selection",
274                              SHAPES_SELECTED: "selection"}
275    
276        # Methods delegated to some instance variables. The delegation is
277        # implemented in the __getattr__ method.
278        delegated_methods = {"SelectLayer": "selection",
279                             "SelectShapes": "selection",
280                             "SelectedLayer": "selection",
281                             "HasSelectedLayer": "selection",
282                             "HasSelectedShapes": "selection"}
283    
284        def __init__(self, parent, winid):
285          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
286          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
287    
# Line 267  class MapCanvas(wxWindow, Publisher): Line 304  class MapCanvas(wxWindow, Publisher):
304          # if the mouse is outside the window.          # if the mouse is outside the window.
305          self.current_position = None          self.current_position = None
306    
   
         # 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  
   
307          # the bitmap serving as backing store          # the bitmap serving as backing store
308          self.bitmap = None          self.bitmap = None
309    
310          # the interactor          # the selection
311          self.interactor = interactor          self.selection = Selection()
312          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)
313    
314            # keep track of which layers/shapes are selected to make sure we
315            # only redraw when necessary
316            self.last_selected_layer = None
317            self.last_selected_shape = None
318    
319          # subscribe the WX events we're interested in          # subscribe the WX events we're interested in
320          EVT_PAINT(self, self.OnPaint)          EVT_PAINT(self, self.OnPaint)
# Line 287  class MapCanvas(wxWindow, Publisher): Line 323  class MapCanvas(wxWindow, Publisher):
323          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
324          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
325          wx.EVT_SIZE(self, self.OnSize)          wx.EVT_SIZE(self, self.OnSize)
         wx.EVT_IDLE(self, self.OnIdle)  
326    
327      def __del__(self):      def __del__(self):
328          wxWindow.__del__(self)          wxWindow.__del__(self)
329          Publisher.__del__(self)          Publisher.__del__(self)
330    
331        def Subscribe(self, channel, *args):
332            """Extend the inherited method to handle delegated messages.
333    
334            If channel is one of the delegated messages call the appropriate
335            object's Subscribe method. Otherwise just call the inherited
336            method.
337            """
338            if channel in self.delegated_messages:
339                object = getattr(self, self.delegated_messages[channel])
340                object.Subscribe(channel, *args)
341            else:
342                Publisher.Subscribe(self, channel, *args)
343    
344        def Unsubscribe(self, channel, *args):
345            """Extend the inherited method to handle delegated messages.
346    
347            If channel is one of the delegated messages call the appropriate
348            object's Unsubscribe method. Otherwise just call the inherited
349            method.
350            """
351            if channel in self.delegated_messages:
352                object = getattr(self, self.delegated_messages[channel])
353                object.Unsubscribe(channel, *args)
354            else:
355                Publisher.Unsubscribe(self, channel, *args)
356    
357        def __getattr__(self, attr):
358            if attr in self.delegated_methods:
359                return getattr(getattr(self, self.delegated_methods[attr]), attr)
360            raise AttributeError(attr)
361    
362      def OnPaint(self, event):      def OnPaint(self, event):
363          dc = wxPaintDC(self)          dc = wxPaintDC(self)
364          if self.map is not None and self.map.HasLayers():          clear = self.map is None or not self.map.HasLayers()
365              # We have a non-empty map. Redraw it in idle time  
366              self.redraw_on_idle = 1          #wxBeginBusyCursor()
367          else:  
368            if not clear:
369                try:
370                    self.do_redraw()
371                except:
372                    print "Error during drawing:", sys.exc_info()[0]
373                    clear = True
374    
375            if clear:
376              # 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
377              # the screen.              # the screen.
378                
379              # XXX it's probably possible to get rid of this. The              # XXX it's probably possible to get rid of this. The
380              # background color of the window is already white and the              # background color of the window is already white and the
381              # only thing we may have to do is to call self.Refresh()              # only thing we may have to do is to call self.Refresh()
382              # with a true argument in the right places.              # with a true argument in the right places.
383              dc.BeginDrawing()              dc.BeginDrawing()
384              dc.Clear()                          dc.Clear()
385              dc.EndDrawing()              dc.EndDrawing()
386    
387            #wxEndBusyCursor()
388    
389      def do_redraw(self):      def do_redraw(self):
390          # This should only be called if we have a non-empty map. We draw          # This should only be called if we have a non-empty map.
         # it into a memory DC and then blit it to the screen.  
391    
392            # Get the window size.
393          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
394    
395          # If self.bitmap's still there, reuse it. Otherwise redraw it          # If self.bitmap's still there, reuse it. Otherwise redraw it
# Line 326  class MapCanvas(wxWindow, Publisher): Line 402  class MapCanvas(wxWindow, Publisher):
402              dc.BeginDrawing()              dc.BeginDrawing()
403    
404              # clear the background              # clear the background
405              dc.SetBrush(wx.wxWHITE_BRUSH)              #dc.SetBrush(wx.wxWHITE_BRUSH)
406              dc.SetPen(wx.wxTRANSPARENT_PEN)              #dc.SetPen(wx.wxTRANSPARENT_PEN)
407              dc.DrawRectangle(0, 0, width, height)              #dc.DrawRectangle(0, 0, width, height)
408                dc.SetBackground(wx.wxWHITE_BRUSH)
409              if 1: #self.interactor.selected_map is self.map:              dc.Clear()
410                  selected_layer = self.interactor.selected_layer  
411                  selected_shape = self.interactor.selected_shape              selected_layer = self.selection.SelectedLayer()
412              else:              selected_shapes = self.selection.SelectedShapes()
                 selected_layer = None  
                 selected_shape = None  
413    
414              # draw the map into the bitmap              # draw the map into the bitmap
415              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.scale, self.offset)
416              renderer.RenderMap(self.map, selected_layer, selected_shape)  
417                # Pass the entire bitmap as update region to the renderer.
418                # We're redrawing the whole bitmap, after all.
419                renderer.RenderMap(self.map, (0, 0, width, height),
420                                   selected_layer, selected_shapes)
421    
422              dc.EndDrawing()              dc.EndDrawing()
423              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
# Line 358  class MapCanvas(wxWindow, Publisher): Line 436  class MapCanvas(wxWindow, Publisher):
436          printout = MapPrintout(self.map)          printout = MapPrintout(self.map)
437          printer.Print(self, printout, wx.true)          printer.Print(self, printout, wx.true)
438          printout.Destroy()          printout.Destroy()
439            
440      def SetMap(self, map):      def SetMap(self, map):
441          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
442                             LAYER_VISIBILITY_CHANGED)                             LAYER_VISIBILITY_CHANGED)
443          if self.map is not None:          if self.map is not None:
444              for channel in redraw_channels:              for channel in redraw_channels:
# Line 368  class MapCanvas(wxWindow, Publisher): Line 446  class MapCanvas(wxWindow, Publisher):
446              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
447                                   self.projection_changed)                                   self.projection_changed)
448          self.map = map          self.map = map
449            self.selection.ClearSelection()
450          if self.map is not None:          if self.map is not None:
451              for channel in redraw_channels:              for channel in redraw_channels:
452                  self.map.Subscribe(channel, self.full_redraw)                  self.map.Subscribe(channel, self.full_redraw)
# Line 379  class MapCanvas(wxWindow, Publisher): Line 458  class MapCanvas(wxWindow, Publisher):
458          self.full_redraw()          self.full_redraw()
459    
460      def Map(self):      def Map(self):
461            """Return the map displayed by this canvas"""
462          return self.map          return self.map
463    
464      def redraw(self, *args):      def redraw(self, *args):
# Line 396  class MapCanvas(wxWindow, Publisher): Line 476  class MapCanvas(wxWindow, Publisher):
476          self.scale = scale          self.scale = scale
477          self.offset = offset          self.offset = offset
478          self.full_redraw()          self.full_redraw()
479            self.issue(SCALE_CHANGED, scale)
480    
481      def proj_to_win(self, x, y):      def proj_to_win(self, x, y):
482          """\          """\
# Line 412  class MapCanvas(wxWindow, Publisher): Line 493  class MapCanvas(wxWindow, Publisher):
493          return ((x - offx) / self.scale, (offy - y) / self.scale)          return ((x - offx) / self.scale, (offy - y) / self.scale)
494    
495      def FitRectToWindow(self, rect):      def FitRectToWindow(self, rect):
496            """Fit the rectangular region given by rect into the window.
497    
498            Set scale so that rect (in projected coordinates) just fits into
499            the window and center it.
500            """
501          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
502          llx, lly, urx, ury = rect          llx, lly, urx, ury = rect
503          if llx == urx or lly == ury:          if llx == urx or lly == ury:
504              # zero with or zero height. Do Nothing              # zero width or zero height. Do Nothing
505              return              return
506          scalex = width / (urx - llx)          scalex = width / (urx - llx)
507          scaley = height / (ury - lly)          scaley = height / (ury - lly)
# Line 425  class MapCanvas(wxWindow, Publisher): Line 511  class MapCanvas(wxWindow, Publisher):
511          self.set_view_transform(scale, (offx, offy))          self.set_view_transform(scale, (offx, offy))
512    
513      def FitMapToWindow(self):      def FitMapToWindow(self):
514          """\          """Fit the map to the window
515          Set the scale and offset so that the map is centered in the  
516          window          Set the scale so that the map fits exactly into the window and
517            center it in the window.
518          """          """
519          bbox = self.map.ProjectedBoundingBox()          bbox = self.map.ProjectedBoundingBox()
520          if bbox is not None:          if bbox is not None:
521              self.FitRectToWindow(bbox)              self.FitRectToWindow(bbox)
522    
523        def FitLayerToWindow(self, layer):
524            """Fit the given layer to the window.
525    
526            Set the scale so that the layer fits exactly into the window and
527            center it in the window.
528            """
529            
530            bbox = layer.LatLongBoundingBox()
531            if bbox is not None:
532                proj = self.map.GetProjection()
533                if proj is not None:
534                    bbox = proj.ForwardBBox(bbox)
535    
536                if bbox is not None:
537                    self.FitRectToWindow(bbox)
538    
539        def FitSelectedToWindow(self):
540            layer = self.selection.SelectedLayer()
541            shapes = self.selection.SelectedShapes()
542    
543            bbox = layer.ShapesBoundingBox(shapes)
544            if bbox is not None:
545                proj = self.map.GetProjection()
546                if proj is not None:
547                    bbox = proj.ForwardBBox(bbox)
548    
549                if bbox is not None:
550                    self.FitRectToWindow(bbox)
551    
552      def ZoomFactor(self, factor, center = None):      def ZoomFactor(self, factor, center = None):
553          """Multiply the zoom by factor and center on center.          """Multiply the zoom by factor and center on center.
554    
# Line 453  class MapCanvas(wxWindow, Publisher): Line 569  class MapCanvas(wxWindow, Publisher):
569          self.set_view_transform(scale, offset)          self.set_view_transform(scale, offset)
570    
571      def ZoomOutToRect(self, rect):      def ZoomOutToRect(self, rect):
572          # rect is given in window coordinates          """Zoom out to fit the currently visible region into rect.
573    
574            The rect parameter is given in window coordinates
575            """
576          # determine the bbox of the displayed region in projected          # determine the bbox of the displayed region in projected
577          # coordinates          # coordinates
578          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
# Line 471  class MapCanvas(wxWindow, Publisher): Line 589  class MapCanvas(wxWindow, Publisher):
589          self.set_view_transform(scale, (offx, offy))          self.set_view_transform(scale, (offx, offy))
590    
591      def Translate(self, dx, dy):      def Translate(self, dx, dy):
592            """Move the map by dx, dy pixels"""
593          offx, offy = self.offset          offx, offy = self.offset
594          self.set_view_transform(self.scale, (offx + dx, offy + dy))          self.set_view_transform(self.scale, (offx + dx, offy + dy))
595    
596        def SelectTool(self, tool):
597            """Make tool the active tool.
598    
599            The parameter should be an instance of Tool or None to indicate
600            that no tool is active.
601            """
602            self.tool = tool
603    
604      def ZoomInTool(self):      def ZoomInTool(self):
605          self.tool = ZoomInTool(self)          """Start the zoom in tool"""
606            self.SelectTool(ZoomInTool(self))
607    
608      def ZoomOutTool(self):      def ZoomOutTool(self):
609          self.tool = ZoomOutTool(self)          """Start the zoom out tool"""
610            self.SelectTool(ZoomOutTool(self))
611    
612      def PanTool(self):      def PanTool(self):
613          self.tool = PanTool(self)          """Start the pan tool"""
614            self.SelectTool(PanTool(self))
615            #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)
616            #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)
617            #print bmp
618            #img = wxImageFromBitmap(bmp)
619            #print img
620            #cur = wxCursor(img)
621            #print cur
622            #self.SetCursor(cur)
623    
624      def IdentifyTool(self):      def IdentifyTool(self):
625          self.tool = IdentifyTool(self)          """Start the identify tool"""
626            self.SelectTool(IdentifyTool(self))
627    
628      def LabelTool(self):      def LabelTool(self):
629          self.tool = LabelTool(self)          """Start the label tool"""
630            self.SelectTool(LabelTool(self))
631    
632      def CurrentTool(self):      def CurrentTool(self):
633            """Return the name of the current tool or None if no tool is active"""
634          return self.tool and self.tool.Name() or None          return self.tool and self.tool.Name() or None
635    
636      def CurrentPosition(self):      def CurrentPosition(self):
# Line 527  class MapCanvas(wxWindow, Publisher): Line 668  class MapCanvas(wxWindow, Publisher):
668              self.tool.MouseDown(event)              self.tool.MouseDown(event)
669              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
670              self.dragging = 1              self.dragging = 1
671            
672      def OnLeftUp(self, event):      def OnLeftUp(self, event):
         self.ReleaseMouse()  
673          self.set_current_position(event)          self.set_current_position(event)
674          if self.dragging:          if self.dragging:
675              self.tool.Hide(self.drag_dc)              self.ReleaseMouse()
676              self.tool.MouseUp(event)              try:
677              self.drag_dc = None                  self.tool.Hide(self.drag_dc)
678          self.dragging = 0                  self.tool.MouseUp(event)
679                finally:
680                    self.drag_dc = None
681                    self.dragging = 0
682    
683      def OnMotion(self, event):      def OnMotion(self, event):
684          self.set_current_position(event)          self.set_current_position(event)
# Line 547  class MapCanvas(wxWindow, Publisher): Line 690  class MapCanvas(wxWindow, Publisher):
690      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
691          self.set_current_position(None)          self.set_current_position(None)
692    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
693      def OnSize(self, event):      def OnSize(self, event):
694          # 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
695          # 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 560  class MapCanvas(wxWindow, Publisher): Line 698  class MapCanvas(wxWindow, Publisher):
698          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
699          # could be reused.          # could be reused.
700          self.full_redraw()          self.full_redraw()
701            pass
702    
703      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
704            """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
705            # The selection object takes care that it only issues
706            # SHAPES_SELECTED messages when the set of selected shapes has
707            # actually changed, so we can do a full redraw unconditionally.
708            # FIXME: We should perhaps try to limit the redraw to the are
709            # actually covered by the shapes before and after the selection
710            # change.
711          self.full_redraw()          self.full_redraw()
712    
713      def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):      def unprojected_rect_around_point(self, x, y, dist):
714            """return a rect dist pixels around (x, y) in unprojected corrdinates
715    
716            The return value is a tuple (minx, miny, maxx, maxy) suitable a
717            parameter to a layer's ShapesInRegion method.
718            """
719            map_proj = self.map.projection
720            if map_proj is not None:
721                inverse = map_proj.Inverse
722            else:
723                inverse = None
724    
725            xs = []
726            ys = []
727            for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):
728                px, py = self.win_to_proj(x + dist * dx, y + dist * dy)
729                if inverse:
730                    px, py = inverse(px, py)
731                xs.append(px)
732                ys.append(py)
733            return (min(xs), min(ys), max(xs), max(ys))
734    
735        def find_shape_at(self, px, py, select_labels = 0, searched_layer = None):
736          """Determine the shape at point px, py in window coords          """Determine the shape at point px, py in window coords
737    
738          Return the shape and the corresponding layer as a tuple (layer,          Return the shape and the corresponding layer as a tuple (layer,
# Line 574  class MapCanvas(wxWindow, Publisher): Line 742  class MapCanvas(wxWindow, Publisher):
742          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
743          as the shape and None as the layer.          as the shape and None as the layer.
744    
745          If the optional parameter selected_layer is true (default), only          If the optional parameter searched_layer is given (or not None
746          search in the currently selected layer.          which it defaults to), only search in that layer.
747          """          """
748          map_proj = self.map.projection          map_proj = self.map.projection
749          if map_proj is not None:          if map_proj is not None:
# Line 588  class MapCanvas(wxWindow, Publisher): Line 756  class MapCanvas(wxWindow, Publisher):
756    
757          if select_labels:          if select_labels:
758              labels = self.map.LabelLayer().Labels()              labels = self.map.LabelLayer().Labels()
759                
760              if labels:              if labels:
761                  dc = wxClientDC(self)                  dc = wxClientDC(self)
762                  font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)                  font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
# Line 620  class MapCanvas(wxWindow, Publisher): Line 788  class MapCanvas(wxWindow, Publisher):
788                      if x <= px < x + width and y <= py <= y + height:                      if x <= px < x + width and y <= py <= y + height:
789                          return None, i                          return None, i
790    
791          if selected_layer:          if searched_layer:
792              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 = []  
793          else:          else:
794              layers = self.map.Layers()              layers = self.map.Layers()
795    
# Line 638  class MapCanvas(wxWindow, Publisher): Line 800  class MapCanvas(wxWindow, Publisher):
800              if not layer.Visible():              if not layer.Visible():
801                  continue                  continue
802    
803              filled = layer.fill is not None              filled = layer.GetClassification().GetDefaultFill() \
804              stroked = layer.stroke is not None                       is not Color.Transparent
805                                stroked = layer.GetClassification().GetDefaultLineColor() \
806                          is not Color.Transparent
807    
808              layer_proj = layer.projection              layer_proj = layer.projection
809              if layer_proj is not None:              if layer_proj is not None:
810                  inverse = layer_proj.Inverse                  inverse = layer_proj.Inverse
811              else:              else:
812                  inverse = None                  inverse = None
813                    
814              shapetype = layer.ShapeType()              shapetype = layer.ShapeType()
815    
816              select_shape = -1              select_shape = -1
817    
818                # Determine the ids of the shapes that overlap a tiny area
819                # around the point. For layers containing points we have to
820                # choose a larger size of the box we're testing agains so
821                # that we take the size of the markers into account
822                # FIXME: Once the markers are more flexible this part has to
823                # become more flexible too, of course
824                if shapetype == SHAPETYPE_POINT:
825                    box = self.unprojected_rect_around_point(px, py, 5)
826                else:
827                    box = self.unprojected_rect_around_point(px, py, 1)
828                shape_ids = layer.ShapesInRegion(box)
829                shape_ids.reverse()
830    
831              if shapetype == SHAPETYPE_POLYGON:              if shapetype == SHAPETYPE_POLYGON:
832                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
833                      result = point_in_polygon_shape(layer.shapefile.cobject(),                      result = point_in_polygon_shape(layer.shapefile.cobject(),
834                                                      i,                                                      i,
835                                                      filled, stroked,                                                      filled, stroked,
# Line 662  class MapCanvas(wxWindow, Publisher): Line 840  class MapCanvas(wxWindow, Publisher):
840                          select_shape = i                          select_shape = i
841                          break                          break
842              elif shapetype == SHAPETYPE_ARC:              elif shapetype == SHAPETYPE_ARC:
843                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
844                      result = point_in_polygon_shape(layer.shapefile.cobject(),                      result = point_in_polygon_shape(layer.shapefile.cobject(),
845                                                      i, 0, 1,                                                      i, 0, 1,
846                                                      map_proj, layer_proj,                                                      map_proj, layer_proj,
# Line 672  class MapCanvas(wxWindow, Publisher): Line 850  class MapCanvas(wxWindow, Publisher):
850                          select_shape = i                          select_shape = i
851                          break                          break
852              elif shapetype == SHAPETYPE_POINT:              elif shapetype == SHAPETYPE_POINT:
853                  for i in range(layer.NumShapes() - 1, -1, -1):                  for i in shape_ids:
854                      shape = layer.Shape(i)                      shape = layer.Shape(i)
855                      x, y = shape.Points()[0]                      x, y = shape.Points()[0]
856                      if inverse:                      if inverse:
# Line 689  class MapCanvas(wxWindow, Publisher): Line 867  class MapCanvas(wxWindow, Publisher):
867                  return layer, select_shape                  return layer, select_shape
868          return None, None          return None, None
869    
870      def SelectShapeAt(self, x, y):      def SelectShapeAt(self, x, y, layer = None):
871          layer, shape = self.find_shape_at(x, y, selected_layer = 0)          """\
872            Select and return the shape and its layer at window position (x, y)
873    
874            If layer is given, only search in that layer. If no layer is
875            given, search through all layers.
876    
877            Return a tuple (layer, shapeid). If no shape is found, return
878            (None, None).
879            """
880            layer, shape = result = self.find_shape_at(x, y, searched_layer=layer)
881          # 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
882          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
883          # the already selected layer again.          # the already selected layer again.
884          if layer is None:          if layer is None:
885              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
886          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
887            else:
888                shapes = [shape]
889            self.selection.SelectShapes(layer, shapes)
890            return result
891    
892      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
893            """Add or remove a label at window position x, y.
894    
895            If there's a label at the given position, remove it. Otherwise
896            determine the shape at the position, run the label dialog and
897            unless the user cancels the dialog, add a laber.
898            """
899          ox = x; oy = y          ox = x; oy = y
900          label_layer = self.map.LabelLayer()          label_layer = self.map.LabelLayer()
901          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
Legend:
Removed from v.125  
changed lines
  Added in v.855
[email protected]
 ViewVC Help
Powered by ViewVC 1.1.26