/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 43 by bh, Fri Sep 7 11:55:51 2001 UTC revision 2709 by dpinte, Tue Oct 3 09:34:51 2006 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 by Intevation GmbH  # opyright (c) 2001, 2002, 2003, 2004 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 9  Line 10 
10  Classes for display of a map and interaction with it  Classes for display of a map and interaction with it
11  """  """
12    
13  __version__ = "$Revision$"  from __future__ import generators
   
 from math import hypot  
   
 from wxPython.wx import wxWindow,\  
      wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\  
      EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION  
14    
15    __version__ = "$Revision$"
16    # $Source$
17    # $Id$
18    
19  from wxPython import wx  import os.path
20    import time
21    import traceback
22    
23  from wxproj import point_in_polygon_shape, shape_centroid  import wx
24    
25    # Export related stuff
26    if wx.Platform == '__WXMSW__':
27        from wx import MetaFileDC
28    
29  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban import _
      LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED  
 from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  
      SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT  
30    
31    from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
32         LAYER_VISIBILITY_CHANGED
33    
34  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
35    
36  import labeldialog  import labeldialog
37    
38  from messages import SELECTED_SHAPE  from viewport import ViewPort, PanTool, output_transform
39    
40    class CanvasPanTool(PanTool):
41    
42  #      """The Canvas Pan Tool"""
 #   The tools  
 #  
   
 class Tool:  
   
     """  
     Base class for the interactive tools  
     """  
   
     def __init__(self, view):  
         """Intitialize the tool. The view is the canvas displaying the map"""  
         self.view = view  
         self.start = self.current = None  
         self.dragging = 0  
         self.drawn = 0  
   
     def Name(self):  
         """Return the tool's name"""  
         return ''  
   
     def drag_start(self, x, y):  
         self.start = self.current = x, y  
         self.dragging = 1  
   
     def drag_move(self, x, y):  
         self.current = x, y  
   
     def drag_stop(self, x, y):  
         self.current = x, y  
         self.dragging = 0  
   
     def Show(self, dc):  
         if not self.drawn:  
             self.draw(dc)  
         self.drawn = 1  
   
     def Hide(self, dc):  
         if self.drawn:  
             self.draw(dc)  
         self.drawn = 0  
   
     def draw(self, dc):  
         pass  
   
     def MouseDown(self, event):  
         self.drag_start(event.m_x, event.m_y)  
43    
44      def MouseMove(self, event):      def MouseMove(self, event):
45          if self.dragging:          if self.dragging:
46              self.drag_move(event.m_x, event.m_y)              PanTool.MouseMove(self, event)
   
     def MouseUp(self, event):  
         if self.dragging:  
             self.drag_move(event.m_x, event.m_y)  
   
     def Cancel(self):  
         self.dragging = 0  
   
   
 class RectTool(Tool):  
   
     """Base class for tools that draw rectangles while dragging"""  
   
     def draw(self, dc):  
         sx, sy = self.start  
         cx, cy = self.current  
         dc.DrawRectangle(sx, sy, cx - sx, cy - sy)  
   
 class ZoomInTool(RectTool):  
   
     """The Zoom-In Tool"""  
   
     def Name(self):  
         return "ZoomInTool"  
   
     def proj_rect(self):  
         """return the rectangle given by start and current in projected  
         coordinates"""  
         sx, sy = self.start  
         cx, cy = self.current  
         left, top = self.view.win_to_proj(sx, sy)  
         right, bottom = self.view.win_to_proj(cx, cy)  
         return (min(left, right), min(top, bottom),  
                 max(left, right), max(top, bottom))  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             self.view.FitRectToWindow(self.proj_rect())  
   
   
 class ZoomOutTool(RectTool):  
   
     """The Zoom-Out Tool"""  
       
     def Name(self):  
         return "ZoomOutTool"  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
47              sx, sy = self.start              sx, sy = self.start
             cx, cy = self.current  
             self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),  
                                      max(sx, cx), max(sy, cy)))  
   
   
 class PanTool(Tool):  
   
     """The Pan Tool"""  
   
     def Name(self):  
         return "PanTool"  
   
     def MouseMove(self, event):  
         if self.dragging:  
             x0, y0 = self.current  
             Tool.MouseMove(self, event)  
48              x, y = self.current              x, y = self.current
49              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
             dc = self.view.drag_dc  
             dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y)  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             self.view.Translate(cx - sx, cy - sy)  
           
 class IdentifyTool(Tool):  
   
     """The "Identify" Tool"""  
       
     def Name(self):  
         return "IdentifyTool"  
   
     def MouseUp(self, event):  
         self.view.SelectShapeAt(event.m_x, event.m_y)  
   
   
 class LabelTool(Tool):  
   
     """The "Label" Tool"""  
   
     def Name(self):  
         return "LabelTool"  
   
     def MouseUp(self, event):  
         self.view.LabelShapeAt(event.m_x, event.m_y)  
   
50    
51                bitmapdc = wx.MemoryDC()
52                bitmapdc.SelectObject(self.view.PreviewBitmap())
53    
54                dc = self.view.drag_dc
55                dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
56    
57  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.Printout):
58    
59      """      """
60      wxPrintout class for printing Thuban maps      wxPrintout class for printing Thuban maps
61      """      """
62    
63      def __init__(self, map):      def __init__(self, canvas, map, region, selected_layer, selected_shapes):
64          wx.wxPrintout.__init__(self)          wx.Printout.__init__(self)
65            self.canvas = canvas
66          self.map = map          self.map = map
67            self.region = region
68            self.selected_layer = selected_layer
69            self.selected_shapes = selected_shapes
70    
71      def GetPageInfo(self):      def GetPageInfo(self):
72          return (1, 1, 1, 1)          return (1, 1, 1, 1)
# Line 215  class MapPrintout(wx.wxPrintout): Line 80  class MapPrintout(wx.wxPrintout):
80    
81      def draw_on_dc(self, dc):      def draw_on_dc(self, dc):
82          width, height = self.GetPageSizePixels()          width, height = self.GetPageSizePixels()
83          llx, lly, urx, ury = self.map.ProjectedBoundingBox()          scale, offset, mapregion = output_transform(self.canvas.scale,
84          scalex = width / (urx - llx)                                                      self.canvas.offset,
85          scaley = height / (ury - lly)                                                      self.canvas.GetSizeTuple(),
86          scale = min(scalex, scaley)                                                      self.GetPageSizePixels())
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
   
87          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
88          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          canvas_scale = self.canvas.scale
89          renderer.RenderMap(self.map)          x, y, width, height = self.region
90          return wx.true          renderer = PrinterRenderer(dc, self.map, scale, offset,
91                                               region = (mapregion[0], mapregion[1],
92                                                 (width/canvas_scale)*scale,
93                                                 (height/canvas_scale)*scale),
94                                       resolution = resy,
95                                       destination_region = mapregion)
96            renderer.RenderMap(self.selected_layer, self.selected_shapes)
97            return True
98    
99    
100  class MapCanvas(wxWindow):  class MapCanvas(wx.Window, ViewPort):
101    
102      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
103    
104      def __init__(self, parent, winid, interactor):      def __init__(self, parent, winid):
105          wxWindow.__init__(self, parent, winid)          wx.Window.__init__(self, parent, winid)
106          self.SetBackgroundColour(wxColour(255, 255, 255))          ViewPort.__init__(self)
107          self.map = None  
108          self.scale = 1.0          self.SetBackgroundColour(wx.Colour(255, 255, 255))
109          self.offset = (0, 0)  
110          self.dragging = 0          # the bitmap serving as backing store
111          self.tool = None          self.bitmap = None
112          self.redraw_on_idle = 0          # the monochrome bitmap with the selection if any
113          EVT_PAINT(self, self.OnPaint)          self.selection_bitmap = None
114          EVT_LEFT_DOWN(self, self.OnLeftDown)  
115          EVT_LEFT_UP(self, self.OnLeftUp)          self.backgroundColor = wx.WHITE_BRUSH
116          EVT_MOTION(self, self.OnMotion)  
117          wx.EVT_IDLE(self, self.OnIdle)          # The rendering iterator object. Used when rendering
118          self.interactor = interactor          # incrementally
119          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.render_iter = None
120    
121            # subscribe the WX events we're interested in
122            self.Bind(wx.EVT_PAINT, self.OnPaint)
123            self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
124            self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
125            self.Bind(wx.EVT_MIDDLE_DOWN, self.OnMiddleDown)
126            self.Bind(wx.EVT_MIDDLE_UP, self.OnMiddleUp)
127            self.Bind(wx.EVT_MOTION, self.OnMotion)
128            self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeaveWindow)
129            self.Bind(wx.EVT_SIZE, self.OnSize)
130            self.Bind(wx.EVT_IDLE, self.OnIdle)
131    
132        def __del__(self):
133            wx.Window.__del__(self)
134            ViewPort.__del__(self)
135    
136      def OnPaint(self, event):      def PreviewBitmap(self):
137          dc = wxPaintDC(self)          return self.bitmap
         if self.map is None or not self.map.HasLayers():  
             return  
         self.redraw_on_idle = 1  
138    
139      def do_redraw(self):      def PanTool(self):
140          width, height = self.GetSizeTuple()          """Start the canvas pan tool"""
141          bitmap = wx.wxEmptyBitmap(width, height)          self.SelectTool(CanvasPanTool(self))
142    
143        def SetMap(self, map):
144            redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
145                               LAYER_VISIBILITY_CHANGED)
146            if self.Map() is not None:
147                for channel in redraw_channels:
148                    self.Map().Unsubscribe(channel, self.full_redraw)
149    
150          dc = wx.wxMemoryDC()          ViewPort.SetMap(self, map)
         dc.SelectObject(bitmap)  
151    
152          dc.BeginDrawing()          if self.Map() is not None:
153                for channel in redraw_channels:
154                    self.Map().Subscribe(channel, self.full_redraw)
155    
156          dc.SetBrush(wx.wxWHITE_BRUSH)          # force a redraw. If map is not empty, it's already been called
157          dc.SetPen(wx.wxTRANSPARENT_PEN)          # by FitMapToWindow but if map is empty it hasn't been called
158          dc.DrawRectangle(0, 0, width, height)          # yet so we have to explicitly call it.
159            self.full_redraw()
160    
161          if 1: #self.interactor.selected_map is self.map:      def OnPaint(self, event):
162              selected_layer = self.interactor.selected_layer          dc = wx.PaintDC(self)
163              selected_shape = self.interactor.selected_shape          if self.Map() is not None and self.Map().HasLayers():
164                if self.bitmap is not None:
165                    dc.BeginDrawing()
166                    dc.DrawBitmap(self.bitmap, 0, 0)
167                    if self.selection_bitmap is not None:
168                        dc.DrawBitmap(self.selection_bitmap, 0, 0, True)
169                    dc.EndDrawing()
170          else:          else:
171              selected_layer = None              # If we've got no map or if the map is empty, simply clear
172              selected_shape = None              # the screen.
               
         renderer = ScreenRenderer(dc, self.scale, self.offset)  
         renderer.RenderMap(self.map, selected_layer, selected_shape)  
   
         clientdc = wxClientDC(self)  
         clientdc.BeginDrawing()  
         clientdc.Blit(0, 0, width, height, dc, 0, 0)  
         clientdc.EndDrawing()  
173    
174                # XXX it's probably possible to get rid of this. The
175                # background color of the window is already white and the
176                # only thing we may have to do is to call self.Refresh()
177                # with a true argument in the right places.
178                dc.BeginDrawing()
179                dc.SetBackground(self.backgroundColor)
180                dc.Clear()
181                dc.EndDrawing()
182    
183      def Print(self):      def OnIdle(self, event):
184          printer = wx.wxPrinter()          """Idle handler. Redraw the bitmap if necessary"""
185          printout = MapPrintout(self.map)          if (self.Map() is not None
186          printer.Print(self, printout, wx.true)              and (self.bitmap is None
187          printout.Destroy()                   or self.render_iter is not None
188                             or (self.HasSelectedShapes()
189      def SetMap(self, map):                       and self.selection_bitmap is None))):
190          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,              event.RequestMore(self._do_redraw())
191                             LAYER_VISIBILITY_CHANGED)  
192          if self.map is not None:      def _do_redraw(self):
193              for channel in redraw_channels:          """Redraw a bit and return whether this method has to be called again.
194                  self.map.Unsubscribe(channel, self.redraw)  
195              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,          Called by OnIdle to handle the actual redraw. Redraw is
196                                   self.projection_changed)          incremental for both the bitmap with the normal layers and the
197          self.map = map          bitmap with the selection.
198          if self.map is not None:          """
199              for channel in redraw_channels:          finished = False
200                  self.map.Subscribe(channel, self.redraw)          if self.render_iter is not None:
201              self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)              try:
202          self.FitMapToWindow()                  if self.render_iter.next():
203                        # Redraw if the last preview redraw was some time
204                        # ago and the user is not currently dragging the
205                        # mouse because redrawing would interfere with what
206                        # the current tool is drawing on the window.
207                        if not self.dragging \
208                               and time.time() - self.render_last_preview > 0.5:
209                            client_dc = wx.ClientDC(self)
210                            client_dc.BeginDrawing()
211                            client_dc.DrawBitmap(self.bitmap, 0, 0)
212                            client_dc.EndDrawing()
213                            self.render_last_preview = time.time()
214                    else:
215                        self.render_iter = None
216                        # Redraw if not dragging because redrawing would
217                        # interfere with what the current tool is drawing on
218                        # the window.
219                        if not self.dragging:
220                            self.redraw()
221                        finished = True
222                except StopIteration:
223                    finished = True
224                    self.render_iter = None
225                except:
226                    finished = True
227                    self.render_iter = None
228                    traceback.print_exc()
229            else:
230                self.render_iter = self._render_iterator()
231                self.render_last_preview = time.time()
232            return not finished
233    
234      def Map(self):      def _render_iterator(self):
235          return self.map          width, height = self.GetSizeTuple()
236            dc = wx.MemoryDC()
237    
238      def redraw(self, *args):          render_start = time.time()
         self.Refresh(0)  
239    
240      def projection_changed(self, *args):          if self.bitmap is None:
241          self.FitMapToWindow()              self.bitmap = wx.EmptyBitmap(width, height)
242          self.redraw()              dc.SelectObject(self.bitmap)
243                dc.BeginDrawing()
244    
245      def set_view_transform(self, scale, offset):              dc.SetBackground(self.backgroundColor)
246          self.scale = scale              dc.Clear()
         self.offset = offset  
         self.redraw()  
247    
248      def proj_to_win(self, x, y):              # draw the map into the bitmap
249          """\              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
250          Return the point in  window coords given by projected coordinates x y                                        (0, 0, width, height))
251          """              for cont in renderer.RenderMapIncrementally():
252          offx, offy = self.offset                  yield True
         return (self.scale * x + offx, -self.scale * y + offy)  
253    
254      def win_to_proj(self, x, y):              dc.EndDrawing()
255          """\              dc.SelectObject(wx.NullBitmap)
         Return the point in projected coordinates given by window coords x y  
         """  
         offx, offy = self.offset  
         return ((x - offx) / self.scale, (offy - y) / self.scale)  
256    
257      def FitRectToWindow(self, rect):          if self.HasSelectedShapes() and self.selection_bitmap is None:
258          width, height = self.GetSizeTuple()              bitmap = wx.EmptyBitmap(width, height)
259          llx, lly, urx, ury = rect              dc.SelectObject(bitmap)
260          scalex = width / (urx - llx)              dc.BeginDrawing()
261          scaley = height / (ury - lly)              dc.SetBackground(wx.WHITE_BRUSH)
262          scale = min(scalex, scaley)              dc.Clear()
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
         self.set_view_transform(scale, (offx, offy))  
   
     def FitMapToWindow(self):  
         """\  
         Set the scale and offset so that the map is centered in the  
         window  
         """  
         bbox = self.map.ProjectedBoundingBox()  
         if bbox is not None:  
             self.FitRectToWindow(bbox)  
263    
264      def ZoomFactor(self, factor):              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
265          width, height = self.GetSizeTuple()                                        (0, 0, width, height))
266          scale = self.scale * factor              layer = self.SelectedLayer()
267          offx, offy = self.offset              shapes = self.selection.SelectedShapes()
268          offset = (factor * (offx - width / 2) + width / 2,              for cont in renderer.draw_selection_incrementally(layer, shapes):
269                    factor * (offy - height / 2) + height / 2)                  yield True
         self.set_view_transform(scale, offset)  
270    
271      def ZoomOutToRect(self, rect):              dc.EndDrawing()
272          # rect is given in window coordinates              dc.SelectObject(wx.NullBitmap)
273    
274          # determine the bbox of the displayed region in projected              bitmap.SetMask(wx.Mask(bitmap, wx.WHITE))
275          # coordinates              self.selection_bitmap = bitmap
276    
277            yield False
278    
279        def Export(self):
280    
281            if hasattr(self, "export_path"):
282                export_path = self.export_path
283            else:
284                export_path="."
285            dlg = wx.FileDialog(self, _("Export Map"), export_path, "",
286                               "Enhanced Metafile (*.wmf)|*.wmf",
287                               wx.SAVE|wx.OVERWRITE_PROMPT)
288            if dlg.ShowModal() == wx.ID_OK:
289                self.export_path = os.path.dirname(dlg.GetPath())
290                dc = wx.MetaFileDC(dlg.GetPath())
291    
292                scale, offset, mapregion = output_transform(self.scale,
293                                                            self.offset,
294                                                            self.GetSizeTuple(),
295                                                            dc.GetSizeTuple())
296    
297                selected_layer = self.selection.SelectedLayer()
298                selected_shapes = self.selection.SelectedShapes()
299    
300                width, height = self.GetSizeTuple()
301                renderer = ExportRenderer(dc, self.Map(), scale, offset,
302                                          region = (0, 0,
303                                                    (width/self.scale)*scale,
304                                                    (height/self.scale)*scale),
305                                          destination_region = mapregion)
306                renderer.RenderMap(selected_layer, selected_shapes)
307    
308                dc.EndDrawing()
309                dc.Close()
310            dlg.Destroy()
311    
312        def Print(self):
313            printer = wx.Printer()
314          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
315          llx, lly = self.win_to_proj(0, height - 1)          selected_layer = self.selection.SelectedLayer()
316          urx, ury = self.win_to_proj(width - 1, 0)          selected_shapes = self.selection.SelectedShapes()
317    
318            printout = MapPrintout(self, self.Map(), (0, 0, width, height),
319                                   selected_layer, selected_shapes)
320            printer.Print(self, printout, True)
321            printout.Destroy()
322    
323          sx, sy, ex, ey = rect      def redraw(self, *args):
324          scalex = (ex - sx) / (urx - llx)          self.Refresh(False)
         scaley = (ey - sy) / (ury - lly)  
         scale = min(scalex, scaley)  
   
         offx = 0.5 * ((ex + sx) - (urx + llx) * scale)  
         offy = 0.5 * ((ey + sy) + (ury + lly) * scale)  
         self.set_view_transform(scale, (offx, offy))  
   
     def Translate(self, dx, dy):  
         offx, offy = self.offset  
         self.set_view_transform(self.scale, (offx + dx, offy + dy))  
325    
326      def ZoomInTool(self):      def full_redraw(self, *args):
327          self.tool = ZoomInTool(self)          self.bitmap = None
328            self.selection_bitmap = None
329            self.render_iter = None
330            self.redraw()
331    
332      def ZoomOutTool(self):      def redraw_selection(self, *args):
333          self.tool = ZoomOutTool(self)          self.selection_bitmap = None
334            self.render_iter = None
335            self.redraw()
336    
337      def PanTool(self):      def map_projection_changed(self, map, old_proj):
338          self.tool = PanTool(self)          ViewPort.map_projection_changed(self, map, old_proj)
339            self.full_redraw()
340    
341        def layer_projection_changed(self, *args):
342            ViewPort.layer_projection_changed(self, args)
343            self.full_redraw()
344    
345      def IdentifyTool(self):      def set_view_transform(self, scale, offset):
346          self.tool = IdentifyTool(self)          ViewPort.set_view_transform(self, scale, offset)
347            self.full_redraw()
348    
349      def LabelTool(self):      def GetPortSizeTuple(self):
350          self.tool = LabelTool(self)          return self.GetSizeTuple()
351    
352      def CurrentTool(self):      def OnMiddleDown(self, event):
353          return self.tool and self.tool.Name() or None          self.remembertool = self.tool
354            if self.Map() is not None and self.Map().HasLayers():
355                self.PanTool()
356                self.OnLeftDown(event)
357    
358        def OnMiddleUp(self, event):
359            self.OnLeftUp(event)
360            if self.remembertool:
361                self.SelectTool(self.remembertool)
362    
363      def OnLeftDown(self, event):      def OnLeftDown(self, event):
364            self.MouseLeftDown(event)
365          if self.tool is not None:          if self.tool is not None:
366              self.drag_dc = wxClientDC(self)              self.drag_dc = wx.ClientDC(self)
367              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wx.INVERT)
368              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)              self.drag_dc.SetBrush(wx.TRANSPARENT_BRUSH)
             self.CaptureMouse()  
             self.tool.MouseDown(event)  
369              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
370                self.CaptureMouse()
371              self.dragging = 1              self.dragging = 1
372            
373      def OnLeftUp(self, event):      def OnLeftUp(self, event):
374          self.ReleaseMouse()          """Handle EVT_LEFT_UP
375    
376            Release the mouse if it was captured, if a tool is active call
377            its Hide method and call self.MouseLeftUp.
378            """
379            # It's important that ReleaseMouse is called before MouseLeftUp.
380            # MouseLeftUp may pop up modal dialogs which leads to an
381            # effectively frozen X session because the user can only
382            # interact with the dialog but the mouse is still grabbed by the
383            # canvas.
384          if self.dragging:          if self.dragging:
385              self.tool.Hide(self.drag_dc)              if self.HasCapture():
386              self.tool.MouseUp(event)                  self.ReleaseMouse()
387              self.drag_dc = None              try:
388          self.dragging = 0                  self.tool.Hide(self.drag_dc)
389                finally:
390                    self.drag_dc = None
391                    self.dragging = 0
392            self.MouseLeftUp(event)
393    
394      def OnMotion(self, event):      def OnMotion(self, event):
395          if self.dragging:          if self.dragging:
396              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
             self.tool.MouseMove(event)  
             self.tool.Show(self.drag_dc)  
   
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
397    
398      def shape_selected(self, layer, shape):          self.MouseMove(event)
         self.redraw()  
399    
400      def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):          if self.dragging:
401          """Determine the shape at point px, py in window coords              self.tool.Show(self.drag_dc)
402    
403          Return the shape and the corresponding layer as a tuple (layer,      def OnLeaveWindow(self, event):
404          shape).          self.set_current_position(None)
405    
406          If the optional parameter select_labels is true (default false)      def OnSize(self, event):
407          search through the labels. If a label is found return it's index          # the window's size has changed. We have to get a new bitmap. If
408          as the shape and None as the layer.          # we want to be clever we could try to get by without throwing
409            # everything away. E.g. when the window gets smaller, we could
410            # either keep the bitmap or create the new one from the old one.
411            # Even when the window becomes larger some parts of the bitmap
412            # could be reused.
413            self.full_redraw()
414    
415          If the optional parameter selected_layer is true (default), only      def shape_selected(self, layer, shape):
416          search in the currently selected layer.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
417            # The selection object takes care that it only issues
418            # SHAPES_SELECTED messages when the set of selected shapes has
419            # actually changed, so we can do a full redraw of the
420            # selection_bitmap unconditionally.
421            ViewPort.shape_selected(self, layer, shape)
422            self.redraw_selection()
423    
424        def GetTextExtent(self, text):
425            dc = wx.ClientDC(self)
426            font = wx.Font(10, wx.SWISS, wx.NORMAL, wx.NORMAL)
427            dc.SetFont(font)
428            return dc.GetTextExtent(text)
429    
430        def LabelShapeAt(self, x, y, text=None):
431            """Add or remove a label at window position x, y.
432    
433            If there's a label at the given position, remove it. Otherwise
434            determine the shape at the position, run the label dialog and
435            unless the user cancels the dialog, add a label.
436          """          """
         map_proj = self.map.projection  
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
   
         scale = self.scale  
         offx, offy = self.offset  
   
         if select_labels:  
             labels = self.map.LabelLayer().Labels()  
               
             if labels:  
                 dc = wxClientDC(self)  
                 font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)  
                 dc.SetFont(font)  
                 for i in range(len(labels)):  
                     label = labels[i]  
                     x = label.x  
                     y = label.y  
                     text = label.text  
                     if forward:  
                         x, y = forward(x, y)  
                     x = x * scale + offx  
                     y = -y * scale + offy  
                     width, height = dc.GetTextExtent(text)  
                     if label.halign == ALIGN_LEFT:  
                         # nothing to be done  
                         pass  
                     elif label.halign == ALIGN_RIGHT:  
                         x = x - width  
                     elif label.halign == ALIGN_CENTER:  
                         x = x - width/2  
                     if label.valign == ALIGN_TOP:  
                         # nothing to be done  
                         pass  
                     elif label.valign == ALIGN_BOTTOM:  
                         y = y - height  
                     elif label.valign == ALIGN_CENTER:  
                         y = y - height/2  
                     if x <= px < x + width and y <= py <= y + height:  
                         return None, i  
   
         if selected_layer:  
             layer = self.interactor.SelectedLayer()  
             if layer is not None:  
                 layers = [layer]  
             else:  
                 # no layer selected. Use an empty list to effectively  
                 # ignore all layers.  
                 layers = []  
         else:  
             layers = self.map.Layers()  
   
         for layer_index in range(len(layers) - 1, -1, -1):  
             layer = layers[layer_index]  
   
             # search only in visible layers  
             if not layer.Visible():  
                 continue  
   
             filled = layer.fill is not None  
             stroked = layer.stroke is not None  
                   
             layer_proj = layer.projection  
             if layer_proj is not None:  
                 inverse = layer_proj.Inverse  
             else:  
                 inverse = None  
                   
             shapetype = layer.ShapeType()  
   
             select_shape = -1  
             if shapetype == SHAPETYPE_POLYGON:  
                 for i in range(layer.NumShapes()):  
                     result = point_in_polygon_shape(layer.shapefile.cobject(),  
                                                     i,  
                                                     filled, stroked,  
                                                     map_proj, layer_proj,  
                                                     scale, -scale, offx, offy,  
                                                     px, py)  
                     if result:  
                         select_shape = i  
                         break  
             elif shapetype == SHAPETYPE_ARC:  
                 for i in range(layer.NumShapes()):  
                     result = point_in_polygon_shape(layer.shapefile.cobject(),  
                                                     i, 0, 1,  
                                                     map_proj, layer_proj,  
                                                     scale, -scale, offx, offy,  
                                                     px, py)  
                     if result < 0:  
                         select_shape = i  
                         break  
             elif shapetype == SHAPETYPE_POINT:  
                 for i in range(layer.NumShapes()):  
                     shape = layer.Shape(i)  
                     x, y = shape.Points()[0]  
                     if inverse:  
                         x, y = inverse(x, y)  
                     if forward:  
                         x, y = forward(x, y)  
                     x = x * scale + offx  
                     y = -y * scale + offy  
                     if hypot(px - x, py - y) < 5:  
                         select_shape = i  
                         break  
   
             if select_shape >= 0:  
                 return layer, select_shape  
         return None, None  
   
     def SelectShapeAt(self, x, y):  
         layer, shape = self.find_shape_at(x, y)  
         # If layer is None, then shape will also be None. We don't want  
         # to deselect the currently selected layer, so we simply select  
         # the already selected layer again.  
         if layer is None:  
             layer = self.interactor.SelectedLayer()  
         self.interactor.SelectLayerAndShape(layer, shape)  
   
     def LabelShapeAt(self, x, y):  
         ox = x; oy = y  
         label_layer = self.map.LabelLayer()  
437          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
438          if layer is None and shape_index is not None:          if layer is None and shape_index is not None:
439              # a label was selected              ViewPort.LabelShapeAt(self, x, y)
             label_layer.RemoveLabel(shape_index)  
440          elif layer is not None:          elif layer is not None:
441              text = labeldialog.run_label_dialog(self, layer.table, shape_index)              text = labeldialog.run_label_dialog(self,
442              if text:                                                  layer.ShapeStore().Table(),
443                  proj = self.map.projection                                                  shape_index)
444                  if proj is not None:              ViewPort.LabelShapeAt(self, x, y, text)
445                      map_proj = proj  
                 else:  
                     map_proj = None  
                 proj = layer.projection  
                 if proj is not None:  
                     layer_proj = proj  
                 else:  
                     layer_proj = None  
446    
                 shapetype = layer.ShapeType()  
                 if shapetype == SHAPETYPE_POLYGON:  
                     x, y = shape_centroid(layer.shapefile.cobject(),  
                                           shape_index,  
                                           map_proj, layer_proj, 1, 1, 0, 0)  
                     if map_proj is not None:  
                         x, y = map_proj.Inverse(x, y)  
                 else:  
                     shape = layer.Shape(shape_index)  
                     if shapetype == SHAPETYPE_POINT:  
                         x, y = shape.Points()[0]  
                     else:  
                         # assume SHAPETYPE_ARC  
                         points = shape.Points()  
                         x, y = points[len(points) / 2]  
                     if layer_proj is not None:  
                         x, y = layer_proj.Inverse(x, y)  
                 if shapetype == SHAPETYPE_POINT:  
                     halign = ALIGN_LEFT  
                     valign = ALIGN_CENTER  
                 elif shapetype == SHAPETYPE_POLYGON:  
                     halign = ALIGN_CENTER  
                     valign = ALIGN_CENTER  
                 elif shapetype == SHAPETYPE_ARC:  
                     halign = ALIGN_LEFT  
                     valign = ALIGN_CENTER  
                 label_layer.AddLabel(x, y, text,  
                                      halign = halign, valign = valign)  
Legend:
Removed from v.43  
changed lines
  Added in v.2709
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