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trunk/thuban/Thuban/UI/view.py revision 296 by bh, Fri Aug 30 16:10:45 2002 UTC branches/WIP-pyshapelib-bramz/Thuban/UI/view.py revision 2755 by dpinte, Thu Apr 12 09:21:58 2007 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 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  
14    
15  from wxPython.wx import wxWindow,\  __version__ = "$Revision$"
16       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\  # $Source$
17       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW  # $Id$
18    
19    import os.path
20    import time
21    import traceback
22    
23  from wxPython import wx  import wx
24    
25  from wxproj import point_in_polygon_shape, shape_centroid  # Export related stuff
26    if wx.Platform == '__WXMSW__':
27        from wx import MetaFileDC
28    
29    from Thuban import _
30    
31  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
32       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_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  
 from Thuban.Lib.connector import Publisher  
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, VIEW_POSITION  from viewport import ViewPort, PanTool, output_transform
   
   
 #  
 #   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)  
   
     def MouseMove(self, event):  
         if self.dragging:  
             self.drag_move(event.m_x, event.m_y)  
   
     def MouseUp(self, event):  
         if self.dragging:  
             self.drag_move(event.m_x, event.m_y)  
   
     def Cancel(self):  
         self.dragging = 0  
   
39    
40  class RectTool(Tool):  class CanvasPanTool(PanTool):
41    
42      """Base class for tools that draw rectangles while dragging"""      """The Canvas Pan Tool"""
   
     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)  
             sx, sy = self.start  
             cx, cy = self.current  
             if sx == cx or sy == cy:  
                 # Just a mouse click or a degenerate rectangle. Simply  
                 # zoom in by a factor of two  
                 # FIXME: For a click this is the desired behavior but should we  
                 # really do this for degenrate rectagles as well or  
                 # should we ignore them?  
                 self.view.ZoomFactor(2, center = (cx, cy))  
             else:  
                 # A drag. Zoom in to the rectangle  
                 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)  
             sx, sy = self.start  
             cx, cy = self.current  
             if sx == cx or sy == cy:  
                 # Just a mouse click or a degenerate rectangle. Simply  
                 # zoom out by a factor of two.  
                 # FIXME: For a click this is the desired behavior but should we  
                 # really do this for degenrate rectagles as well or  
                 # should we ignore them?  
                 self.view.ZoomFactor(0.5, center = (cx, cy))  
             else:  
                 # A drag. Zoom out to the rectangle  
                 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"  
43    
44      def MouseMove(self, event):      def MouseMove(self, event):
45          if self.dragging:          if self.dragging:
46              Tool.MouseMove(self, event)              PanTool.MouseMove(self, event)
47              sx, sy = self.start              sx, sy = self.start
48              x, y = self.current              x, y = self.current
49              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
50    
51              bitmapdc = wx.wxMemoryDC()              bitmapdc = wx.MemoryDC()
52              bitmapdc.SelectObject(self.view.bitmap)              bitmapdc.SelectObject(self.view.PreviewBitmap())
53    
54              dc = self.view.drag_dc              dc = self.view.drag_dc
55              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
56    
57      def MouseUp(self, event):  class MapPrintout(wx.Printout):
         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)  
   
   
   
   
 class MapPrintout(wx.wxPrintout):  
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 239  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, Publisher):  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    
108          # the map displayed in this canvas. Set with SetMap()          self.SetBackgroundColour(wx.Colour(255, 255, 255))
         self.map = None  
   
         # scale and offset describe the transformation from projected  
         # coordinates to window coordinates.  
         self.scale = 1.0  
         self.offset = (0, 0)  
   
         # whether the user is currently dragging the mouse, i.e. moving  
         # the mouse while pressing a mouse button  
         self.dragging = 0  
   
         # the currently active tool  
         self.tool = None  
   
         # The current mouse position of the last OnMotion event or None  
         # if the mouse is outside the window.  
         self.current_position = None  
   
         # 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  
109    
110          # the bitmap serving as backing store          # the bitmap serving as backing store
111          self.bitmap = None          self.bitmap = None
112            # the monochrome bitmap with the selection if any
113            self.selection_bitmap = None
114    
115            self.backgroundColor = wx.WHITE_BRUSH
116    
117          # the interactor          # 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
   
         # keep track of which layers/shapes are selected to make sure we  
         # only redraw when necessary  
         self.last_selected_layer = None  
         self.last_selected_shape = None  
120    
121          # subscribe the WX events we're interested in          # subscribe the WX events we're interested in
122          EVT_PAINT(self, self.OnPaint)          self.Bind(wx.EVT_PAINT, self.OnPaint)
123          EVT_LEFT_DOWN(self, self.OnLeftDown)          self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
124          EVT_LEFT_UP(self, self.OnLeftUp)          self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
125          EVT_MOTION(self, self.OnMotion)          self.Bind(wx.EVT_MIDDLE_DOWN, self.OnMiddleDown)
126          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          self.Bind(wx.EVT_MIDDLE_UP, self.OnMiddleUp)
127          wx.EVT_SIZE(self, self.OnSize)          self.Bind(wx.EVT_MOTION, self.OnMotion)
128          wx.EVT_IDLE(self, self.OnIdle)          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):      def __del__(self):
133          wxWindow.__del__(self)          wx.Window.__del__(self)
134          Publisher.__del__(self)          ViewPort.__del__(self)
135    
136        def PreviewBitmap(self):
137            return self.bitmap
138    
139        def PanTool(self):
140            """Start the canvas pan tool"""
141            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            ViewPort.SetMap(self, map)
151    
152            if self.Map() is not None:
153                for channel in redraw_channels:
154                    self.Map().Subscribe(channel, self.full_redraw)
155    
156            # force a redraw. If map is not empty, it's already been called
157            # by FitMapToWindow but if map is empty it hasn't been called
158            # yet so we have to explicitly call it.
159            self.full_redraw()
160    
161      def OnPaint(self, event):      def OnPaint(self, event):
162          dc = wxPaintDC(self)          dc = wx.PaintDC(self)
163          if self.map is not None and self.map.HasLayers():          if self.Map() is not None and self.Map().HasLayers():
164              # We have a non-empty map. Redraw it in idle time              if self.bitmap is not None:
165              self.redraw_on_idle = 1                  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              # 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
172              # the screen.              # the screen.
# Line 323  class MapCanvas(wxWindow, Publisher): Line 176  class MapCanvas(wxWindow, Publisher):
176              # only thing we may have to do is to call self.Refresh()              # only thing we may have to do is to call self.Refresh()
177              # with a true argument in the right places.              # with a true argument in the right places.
178              dc.BeginDrawing()              dc.BeginDrawing()
179                dc.SetBackground(self.backgroundColor)
180              dc.Clear()              dc.Clear()
181              dc.EndDrawing()              dc.EndDrawing()
182    
183      def do_redraw(self):      def OnIdle(self, event):
184          # This should only be called if we have a non-empty map.          """Idle handler. Redraw the bitmap if necessary"""
185            if (self.Map() is not None
186                and (self.bitmap is None
187                     or self.render_iter is not None
188                     or (self.HasSelectedShapes()
189                         and self.selection_bitmap is None))):
190                event.RequestMore(self._do_redraw())
191    
192        def _do_redraw(self):
193            """Redraw a bit and return whether this method has to be called again.
194    
195            Called by OnIdle to handle the actual redraw. Redraw is
196            incremental for both the bitmap with the normal layers and the
197            bitmap with the selection.
198            """
199            finished = False
200            if self.render_iter is not None:
201                try:
202                    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          # Get the window size.      def _render_iterator(self):
235          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
236            dc = wx.MemoryDC()
237    
238          # If self.bitmap's still there, reuse it. Otherwise redraw it          render_start = time.time()
239          if self.bitmap is not None:  
240              bitmap = self.bitmap          if self.bitmap is None:
241          else:              self.bitmap = wx.EmptyBitmap(width, height)
242              bitmap = wx.wxEmptyBitmap(width, height)              dc.SelectObject(self.bitmap)
             dc = wx.wxMemoryDC()  
             dc.SelectObject(bitmap)  
243              dc.BeginDrawing()              dc.BeginDrawing()
244    
245              # clear the background              dc.SetBackground(self.backgroundColor)
246              dc.SetBrush(wx.wxWHITE_BRUSH)              dc.Clear()
             dc.SetPen(wx.wxTRANSPARENT_PEN)  
             dc.DrawRectangle(0, 0, width, height)  
   
             if 1: #self.interactor.selected_map is self.map:  
                 selected_layer = self.interactor.selected_layer  
                 selected_shape = self.interactor.selected_shape  
             else:  
                 selected_layer = None  
                 selected_shape = None  
247    
248              # draw the map into the bitmap              # draw the map into the bitmap
249              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
250                                          (0, 0, width, height))
251              # Pass the entire bitmap as update region to the renderer.              for cont in renderer.RenderMapIncrementally():
252              # We're redrawing the whole bitmap, after all.                  yield True
             renderer.RenderMap(self.map, (0, 0, width, height),  
                                selected_layer, selected_shape)  
253    
254              dc.EndDrawing()              dc.EndDrawing()
255              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.NullBitmap)
             self.bitmap = bitmap  
   
         # blit the bitmap to the screen  
         dc = wx.wxMemoryDC()  
         dc.SelectObject(bitmap)  
         clientdc = wxClientDC(self)  
         clientdc.BeginDrawing()  
         clientdc.Blit(0, 0, width, height, dc, 0, 0)  
         clientdc.EndDrawing()  
   
     def Print(self):  
         printer = wx.wxPrinter()  
         printout = MapPrintout(self.map)  
         printer.Print(self, printout, wx.true)  
         printout.Destroy()  
256    
257      def SetMap(self, map):          if self.HasSelectedShapes() and self.selection_bitmap is None:
258          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,              bitmap = wx.EmptyBitmap(width, height)
259                             LAYER_VISIBILITY_CHANGED)              dc.SelectObject(bitmap)
260          if self.map is not None:              dc.BeginDrawing()
261              for channel in redraw_channels:              dc.SetBackground(wx.WHITE_BRUSH)
262                  self.map.Unsubscribe(channel, self.full_redraw)              dc.Clear()
             self.map.Unsubscribe(MAP_PROJECTION_CHANGED,  
                                  self.projection_changed)  
         self.map = map  
         if self.map is not None:  
             for channel in redraw_channels:  
                 self.map.Subscribe(channel, self.full_redraw)  
             self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)  
         self.FitMapToWindow()  
         # force a redraw. If map is not empty, it's already been called  
         # by FitMapToWindow but if map is empty it hasn't been called  
         # yet so we have to explicitly call it.  
         self.full_redraw()  
263    
264      def Map(self):              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
265          """Return the map displayed by this canvas"""                                        (0, 0, width, height))
266          return self.map              layer = self.SelectedLayer()
267                shapes = self.selection.SelectedShapes()
268                for cont in renderer.draw_selection_incrementally(layer, shapes):
269                    yield True
270    
271      def redraw(self, *args):              dc.EndDrawing()
272          self.Refresh(0)              dc.SelectObject(wx.NullBitmap)
273    
274      def full_redraw(self, *args):              bitmap.SetMask(wx.Mask(bitmap, wx.WHITE))
275          self.bitmap = None              self.selection_bitmap = bitmap
         self.redraw()  
276    
277      def projection_changed(self, *args):          yield False
         self.FitMapToWindow()  
         self.full_redraw()  
278    
279      def set_view_transform(self, scale, offset):      def Export(self):
         self.scale = scale  
         self.offset = offset  
         self.full_redraw()  
280    
281      def proj_to_win(self, x, y):          if hasattr(self, "export_path"):
282          """\              export_path = self.export_path
283          Return the point in  window coords given by projected coordinates x y          else:
284          """              export_path="."
285          offx, offy = self.offset          dlg = wx.FileDialog(self, _("Export Map"), export_path, "",
286          return (self.scale * x + offx, -self.scale * y + offy)                             "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      def win_to_proj(self, x, y):              dc.EndDrawing()
309          """\              dc.Close()
310          Return the point in projected coordinates given by window coords x y          dlg.Destroy()
         """  
         offx, offy = self.offset  
         return ((x - offx) / self.scale, (offy - y) / self.scale)  
311    
312      def FitRectToWindow(self, rect):      def Print(self):
313          """Fit the rectangular region given by rect into the window.          printer = wx.Printer()
           
         Set scale so that rect (in projected coordinates) just fits into  
         the window and center it.  
         """  
         width, height = self.GetSizeTuple()  
         llx, lly, urx, ury = rect  
         if llx == urx or lly == ury:  
             # zero with or zero height. Do Nothing  
             return  
         scalex = width / (urx - llx)  
         scaley = height / (ury - lly)  
         scale = min(scalex, scaley)  
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
         self.set_view_transform(scale, (offx, offy))  
   
     def FitMapToWindow(self):  
         """Fit the map to the window  
           
         Set the scale so that the map fits exactly into the window and  
         center it in the window.  
         """  
         bbox = self.map.ProjectedBoundingBox()  
         if bbox is not None:  
             self.FitRectToWindow(bbox)  
   
     def ZoomFactor(self, factor, center = None):  
         """Multiply the zoom by factor and center on center.  
   
         The optional parameter center is a point in window coordinates  
         that should be centered. If it is omitted, it defaults to the  
         center of the window  
         """  
314          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
315          scale = self.scale * factor          selected_layer = self.selection.SelectedLayer()
316          offx, offy = self.offset          selected_shapes = self.selection.SelectedShapes()
         if center is not None:  
             cx, cy = center  
         else:  
             cx = width / 2  
             cy = height / 2  
         offset = (factor * (offx - cx) + width / 2,  
                   factor * (offy - cy) + height / 2)  
         self.set_view_transform(scale, offset)  
317    
318      def ZoomOutToRect(self, rect):          printout = MapPrintout(self, self.Map(), (0, 0, width, height),
319          """Zoom out to fit the currently visible region into rect.                                 selected_layer, selected_shapes)
320            printer.Print(self, printout, True)
321            printout.Destroy()
322    
323          The rect parameter is given in window coordinates      def redraw(self, *args):
324          """          self.Refresh(False)
         # determine the bbox of the displayed region in projected  
         # coordinates  
         width, height = self.GetSizeTuple()  
         llx, lly = self.win_to_proj(0, height - 1)  
         urx, ury = self.win_to_proj(width - 1, 0)  
325    
326          sx, sy, ex, ey = rect      def full_redraw(self, *args):
327          scalex = (ex - sx) / (urx - llx)          self.bitmap = None
328          scaley = (ey - sy) / (ury - lly)          self.selection_bitmap = None
329          scale = min(scalex, scaley)          self.render_iter = None
330            self.redraw()
         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):  
         """Move the map by dx, dy pixels"""  
         offx, offy = self.offset  
         self.set_view_transform(self.scale, (offx + dx, offy + dy))  
   
     def ZoomInTool(self):  
         """Start the zoom in tool"""  
         self.tool = ZoomInTool(self)  
   
     def ZoomOutTool(self):  
         """Start the zoom out tool"""  
         self.tool = ZoomOutTool(self)  
331    
332      def PanTool(self):      def redraw_selection(self, *args):
333          """Start the pan tool"""          self.selection_bitmap = None
334          self.tool = PanTool(self)          self.render_iter = None
335            self.redraw()
336    
337      def IdentifyTool(self):      def map_projection_changed(self, map, old_proj):
338          """Start the identify tool"""          ViewPort.map_projection_changed(self, map, old_proj)
339          self.tool = IdentifyTool(self)          self.full_redraw()
   
     def LabelTool(self):  
         """Start the label tool"""  
         self.tool = LabelTool(self)  
   
     def CurrentTool(self):  
         """Return the name of the current tool or None if no tool is active"""  
         return self.tool and self.tool.Name() or None  
340    
341      def CurrentPosition(self):      def layer_projection_changed(self, *args):
342          """Return current position of the mouse in projected coordinates.          ViewPort.layer_projection_changed(self, args)
343            self.full_redraw()
344    
345          The result is a 2-tuple of floats with the coordinates. If the      def set_view_transform(self, scale, offset):
346          mouse is not in the window, the result is None.          ViewPort.set_view_transform(self, scale, offset)
347          """          self.full_redraw()
         if self.current_position is not None:  
             x, y = self.current_position  
             return self.win_to_proj(x, y)  
         else:  
             return None  
348    
349      def set_current_position(self, event):      def GetPortSizeTuple(self):
350          """Set the current position from event          return self.GetSizeTuple()
351    
352          Should be called by all events that contain mouse positions      def OnMiddleDown(self, event):
353          especially EVT_MOTION. The event paramete may be None to          self.remembertool = self.tool
354          indicate the the pointer left the window.          if self.Map() is not None and self.Map().HasLayers():
355          """              self.PanTool()
356          if event is not None:              self.OnLeftDown(event)
357              self.current_position = (event.m_x, event.m_y)  
358          else:      def OnMiddleUp(self, event):
359              self.current_position = None          self.OnLeftUp(event)
360          self.issue(VIEW_POSITION)          if self.remembertool:
361                self.SelectTool(self.remembertool)
362    
363      def OnLeftDown(self, event):      def OnLeftDown(self, event):
364          self.set_current_position(event)          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.set_current_position(event)          """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.ReleaseMouse()              if self.HasCapture():
386              self.tool.Hide(self.drag_dc)                  self.ReleaseMouse()
387              self.tool.MouseUp(event)              try:
388              self.drag_dc = None                  self.tool.Hide(self.drag_dc)
389          self.dragging = 0              finally:
390                    self.drag_dc = None
391                    self.dragging = 0
392            self.MouseLeftUp(event)
393    
394      def OnMotion(self, event):      def OnMotion(self, event):
         self.set_current_position(event)  
395          if self.dragging:          if self.dragging:
396              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
397              self.tool.MouseMove(event)  
398            self.MouseMove(event)
399    
400            if self.dragging:
401              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
402    
403      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
404          self.set_current_position(None)          self.set_current_position(None)
405    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
406      def OnSize(self, event):      def OnSize(self, event):
407          # 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
408          # 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 598  class MapCanvas(wxWindow, Publisher): Line 413  class MapCanvas(wxWindow, Publisher):
413          self.full_redraw()          self.full_redraw()
414    
415      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
416          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
417            # The selection object takes care that it only issues
418          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
419          when necessary.          # actually changed, so we can do a full redraw of the
420          """          # selection_bitmap unconditionally.
421          # A redraw is necessary when the display has to change, which          ViewPort.shape_selected(self, layer, shape)
422          # means that either the status changes from having no selection          self.redraw_selection()
423          # to having a selection shape or vice versa, or when the fact  
424          # whether there is a selection at all doesn't change, when the      def GetTextExtent(self, text):
425          # shape which is selected has changed (which means that layer or          dc = wx.ClientDC(self)
426          # shapeid changes).          font = wx.Font(10, wx.SWISS, wx.NORMAL, wx.NORMAL)
427          if ((shape is not None or self.last_selected_shape is not None)          dc.SetFont(font)
428              and (shape != self.last_selected_shape          return dc.GetTextExtent(text)
                  or layer != self.last_selected_layer)):  
             self.full_redraw()  
   
         # remember the selection so we can compare when it changes again.  
         self.last_selected_layer = layer  
         self.last_selected_shape = shape  
429    
430      def unprojected_rect_around_point(self, x, y):      def LabelShapeAt(self, x, y, text=None):
         """return a rect a few pixels around (x, y) in unprojected corrdinates  
   
         The return value is a tuple (minx, miny, maxx, maxy) suitable a  
         parameter to a layer's ShapesInRegion method.  
         """  
         map_proj = self.map.projection  
         if map_proj is not None:  
             inverse = map_proj.Inverse  
         else:  
             inverse = None  
   
         xs = []  
         ys = []  
         for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):  
             px, py = self.win_to_proj(x + dx, y + dy)  
             if inverse:  
                 px, py = inverse(px, py)  
             xs.append(px)  
             ys.append(py)  
         return (min(xs), min(ys), max(xs), max(ys))  
   
     def find_shape_at(self, px, py, select_labels = 0, searched_layer = None):  
         """Determine the shape at point px, py in window coords  
   
         Return the shape and the corresponding layer as a tuple (layer,  
         shape).  
   
         If the optional parameter select_labels is true (default false)  
         search through the labels. If a label is found return it's index  
         as the shape and None as the layer.  
   
         If the optional parameter searched_layer is given (or not None  
         which it defaults to), only search in that layer.  
         """  
         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  
   
         box = self.unprojected_rect_around_point(px, py)  
   
         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) - 1, -1, -1):  
                     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 searched_layer:  
             layers = [searched_layer]  
         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  
   
             shape_ids = layer.ShapesInRegion(box)  
             shape_ids.reverse()  
   
             if shapetype == SHAPETYPE_POLYGON:  
                 for i in shape_ids:  
                     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 shape_ids:  
                     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 shape_ids:  
                     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 = None):  
         """\  
         Select and return the shape and its layer at window position (x, y)  
   
         If layer is given, only search in that layer. If no layer is  
         given, search through all layers.  
   
         Return a tuple (layer, shapeid). If no shape is found, return  
         (None, None).  
         """  
         layer, shape = result = self.find_shape_at(x, y, searched_layer=layer)  
         # 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)  
         return result  
   
     def LabelShapeAt(self, x, y):  
431          """Add or remove a label at window position x, y.          """Add or remove a label at window position x, y.
432    
433          If there's a label at the given position, remove it. Otherwise          If there's a label at the given position, remove it. Otherwise
434          determine the shape at the position, run the label dialog and          determine the shape at the position, run the label dialog and
435          unless the user cancels the dialog, add a laber.          unless the user cancels the dialog, add a label.
436          """          """
         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)  
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