/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 789 by bh, Wed Apr 30 11:06:00 2003 UTC revision 1454 by bh, Fri Jul 18 14:41:04 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Frank Koormann <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 11  Classes for display of a map and interac Line 12  Classes for display of a map and interac
12    
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    
15    from Thuban import _
16    
17    import sys
18    import os.path
19    
20  from math import hypot  from math import hypot
21    
22  from wxPython.wx import wxWindow,\  from wxPython.wx import wxWindow, \
23       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
24       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW, \
25         wxBITMAP_TYPE_XPM, wxCursor, wxPlatform, \
26         wxBeginBusyCursor, wxEndBusyCursor, wxFileDialog, wxSAVE, \
27         wxOVERWRITE_PROMPT, wxID_OK
28    
29    # Export related stuff
30    if wxPlatform == '__WXMSW__':
31        from wxPython.wx import wxMetaFileDC
32    
33  from wxPython import wx  from wxPython import wx
34    
35  from wxproj import point_in_polygon_shape, shape_centroid  from wxproj import point_in_polygon_shape, shape_centroid
36    
37    from Thuban.Model.messages import \
38         MAP_PROJECTION_CHANGED, MAP_LAYERS_CHANGED, \
39         LAYER_PROJECTION_CHANGED, LAYER_CHANGED, LAYER_VISIBILITY_CHANGED
40    
41  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
      MAP_LAYERS_CHANGED, LAYER_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  
 from Thuban.Model.color import Color  
   
 from selection import Selection  
 from renderer import ScreenRenderer, PrinterRender  
42    
43  import labeldialog  import labeldialog
44    
45  from messages import LAYER_SELECTED, SHAPES_SELECTED, 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  
   
46    
47  class RectTool(Tool):  class CanvasPanTool(PanTool):
48    
49      """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"  
50    
51      def MouseMove(self, event):      def MouseMove(self, event):
52          if self.dragging:          if self.dragging:
53              Tool.MouseMove(self, event)              PanTool.MouseMove(self, event)
54              sx, sy = self.start              sx, sy = self.start
55              x, y = self.current              x, y = self.current
56              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
# Line 188  class PanTool(Tool): Line 61  class PanTool(Tool):
61              dc = self.view.drag_dc              dc = self.view.drag_dc
62              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
63    
     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)  
   
   
   
   
64  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.wxPrintout):
65    
66      """      """
67      wxPrintout class for printing Thuban maps      wxPrintout class for printing Thuban maps
68      """      """
69    
70      def __init__(self, map):      def __init__(self, canvas, map, region, selected_layer, selected_shapes):
71          wx.wxPrintout.__init__(self)          wx.wxPrintout.__init__(self)
72            self.canvas = canvas
73          self.map = map          self.map = map
74            self.region = region
75            self.selected_layer = selected_layer
76            self.selected_shapes = selected_shapes
77    
78      def GetPageInfo(self):      def GetPageInfo(self):
79          return (1, 1, 1, 1)          return (1, 1, 1, 1)
# Line 241  class MapPrintout(wx.wxPrintout): Line 87  class MapPrintout(wx.wxPrintout):
87    
88      def draw_on_dc(self, dc):      def draw_on_dc(self, dc):
89          width, height = self.GetPageSizePixels()          width, height = self.GetPageSizePixels()
90          llx, lly, urx, ury = self.map.ProjectedBoundingBox()          scale, offset, mapregion = output_transform(self.canvas.scale,
91          scalex = width / (urx - llx)                                                      self.canvas.offset,
92          scaley = height / (ury - lly)                                                      self.canvas.GetSizeTuple(),
93          scale = min(scalex, scaley)                                                      self.GetPageSizePixels())
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
   
94          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
95          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          renderer = PrinterRenderer(dc, scale, offset, resolution = resy)
96          renderer.RenderMap(self.map)          x, y, width, height = self.region
97          return wx.true          canvas_scale = self.canvas.scale
98            renderer.RenderMap(self.map,
99                               (0,0,
100                                    (width/canvas_scale)*scale,
101                                    (height/canvas_scale)*scale),
102                                    mapregion,
103                               self.selected_layer, self.selected_shapes)
104            return True
105    
106  class MapCanvas(wxWindow, Publisher):  class MapCanvas(wxWindow, ViewPort):
107    
108      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
109    
     # Some messages that can be subscribed/unsubscribed directly through  
     # the MapCanvas come in fact from other objects. This is a dict  
     # mapping those messages to the names of the instance variables they  
     # actually come from. The delegation is implemented in the Subscribe  
     # and Unsubscribe methods  
     delegated_messages = {LAYER_SELECTED: "selection",  
                           SHAPES_SELECTED: "selection"}  
   
     # Methods delegated to some instance variables. The delegation is  
     # implemented in the __getattr__ method.  
     delegated_methods = {"SelectLayer": "selection",  
                          "SelectShapes": "selection",  
                          "SelectedLayer": "selection",  
                          "HasSelectedLayer": "selection"}  
   
110      def __init__(self, parent, winid):      def __init__(self, parent, winid):
111          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
112          self.SetBackgroundColour(wxColour(255, 255, 255))          ViewPort.__init__(self)
   
         # the map displayed in this canvas. Set with SetMap()  
         self.map = None  
113    
114          # scale and offset describe the transformation from projected          self.SetBackgroundColour(wxColour(255, 255, 255))
         # 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  
115    
116          # the bitmap serving as backing store          # the bitmap serving as backing store
117          self.bitmap = None          self.bitmap = None
118    
119          # the selection          self.backgroundColor = wx.wxWHITE_BRUSH
         self.selection = Selection()  
         self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)  
   
         # 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)          EVT_PAINT(self, self.OnPaint)
# Line 315  class MapCanvas(wxWindow, Publisher): Line 125  class MapCanvas(wxWindow, Publisher):
125          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
126          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
127          wx.EVT_SIZE(self, self.OnSize)          wx.EVT_SIZE(self, self.OnSize)
128            wx.EVT_IDLE(self, self.OnIdle)
129    
130      def __del__(self):      def __del__(self):
131          wxWindow.__del__(self)          wxWindow.__del__(self)
132          Publisher.__del__(self)          ViewPort.__del__(self)
133    
134      def Subscribe(self, channel, *args):      def PanTool(self):
135          """Extend the inherited method to handle delegated messages.          """Start the canvas pan tool"""
136            self.SelectTool(CanvasPanTool(self))
137          If channel is one of the delegated messages call the appropriate          
138          object's Subscribe method. Otherwise just call the inherited      def SetMap(self, map):
139          method.          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
140          """                             LAYER_VISIBILITY_CHANGED)
141          if channel in self.delegated_messages:          if self.Map() is not None:
142              object = getattr(self, self.delegated_messages[channel])              for channel in redraw_channels:
143              object.Subscribe(channel, *args)                  self.Map().Unsubscribe(channel, self.full_redraw)
         else:  
             Publisher.Subscribe(self, channel, *args)  
144    
145      def Unsubscribe(self, channel, *args):          ViewPort.SetMap(self, map)
         """Extend the inherited method to handle delegated messages.  
146    
147          If channel is one of the delegated messages call the appropriate          if self.Map() is not None:
148          object's Unsubscribe method. Otherwise just call the inherited              for channel in redraw_channels:
149          method.                  self.Map().Subscribe(channel, self.full_redraw)
         """  
         if channel in self.delegated_messages:  
             object = getattr(self, self.delegated_messages[channel])  
             object.Unsubscribe(channel, *args)  
         else:  
             Publisher.Unsubscribe(self, channel, *args)  
150    
151      def __getattr__(self, attr):          # force a redraw. If map is not empty, it's already been called
152          if attr in self.delegated_methods:          # by FitMapToWindow but if map is empty it hasn't been called
153              return getattr(getattr(self, self.delegated_methods[attr]), attr)          # yet so we have to explicitly call it.
154          raise AttributeError(attr)          self.full_redraw()
155    
156      def OnPaint(self, event):      def OnPaint(self, event):
157          dc = wxPaintDC(self)          dc = wxPaintDC(self)
158          if self.map is not None and self.map.HasLayers():  
159              self.do_redraw()          if self.Map() is not None and self.Map().HasLayers():
160                if self.bitmap in (None, -1):
161                    # set the flag that we should redraw the
162                    # bitmap in idle time
163                    self.bitmap = -1
164                else:
165                    # blit the bitmap to the screen
166                    dc.BeginDrawing()
167                    dc.DrawBitmap(self.bitmap, 0, 0)
168                    dc.EndDrawing()
169          else:          else:
170              # 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
171              # the screen.              # the screen.
# Line 364  class MapCanvas(wxWindow, Publisher): Line 175  class MapCanvas(wxWindow, Publisher):
175              # only thing we may have to do is to call self.Refresh()              # only thing we may have to do is to call self.Refresh()
176              # with a true argument in the right places.              # with a true argument in the right places.
177              dc.BeginDrawing()              dc.BeginDrawing()
178                dc.SetBackground(self.backgroundColor)
179              dc.Clear()              dc.Clear()
180              dc.EndDrawing()              dc.EndDrawing()
181    
182      def do_redraw(self):      def OnIdle(self, event):
183          # This should only be called if we have a non-empty map.          # render the screen if necessary
184    
185          # Get the window size.          if self.bitmap != -1:
186          width, height = self.GetSizeTuple()              return
187    
188            wxBeginBusyCursor()
189            try:
190                width, height = self.GetSizeTuple()
191    
         # If self.bitmap's still there, reuse it. Otherwise redraw it  
         if self.bitmap is not None:  
             bitmap = self.bitmap  
         else:  
192              bitmap = wx.wxEmptyBitmap(width, height)              bitmap = wx.wxEmptyBitmap(width, height)
193              dc = wx.wxMemoryDC()              dc = wx.wxMemoryDC()
194              dc.SelectObject(bitmap)              dc.SelectObject(bitmap)
195              dc.BeginDrawing()              dc.BeginDrawing()
196    
197              # clear the background              dc.SetBackground(self.backgroundColor)
198              dc.SetBrush(wx.wxWHITE_BRUSH)              dc.Clear()
             dc.SetPen(wx.wxTRANSPARENT_PEN)  
             dc.DrawRectangle(0, 0, width, height)  
199    
200              selected_layer = self.selection.SelectedLayer()              selected_layer = self.selection.SelectedLayer()
201              selected_shapes = self.selection.SelectedShapes()              selected_shapes = self.selection.SelectedShapes()
# Line 395  class MapCanvas(wxWindow, Publisher): Line 205  class MapCanvas(wxWindow, Publisher):
205    
206              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
207              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
208              renderer.RenderMap(self.map, (0, 0, width, height),              renderer.RenderMap(self.Map(), (0, 0, width, height),
209                                 selected_layer, selected_shapes)                                 selected_layer, selected_shapes)
210    
211              dc.EndDrawing()              dc.EndDrawing()
212              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
213    
214              self.bitmap = bitmap              self.bitmap = bitmap
215            finally:
216                wxEndBusyCursor()
217                pass
218    
219          # blit the bitmap to the screen          # This causes a paint event that then draws the bitmap
220          dc = wx.wxMemoryDC()          self.redraw()
221          dc.SelectObject(bitmap)  
222          clientdc = wxClientDC(self)      def Export(self):
223          clientdc.BeginDrawing()  
224          clientdc.Blit(0, 0, width, height, dc, 0, 0)          if hasattr(self, "export_path"):
225          clientdc.EndDrawing()              export_path = self.export_path
226            else:
227                export_path="."
228            dlg = wxFileDialog(self, _("Export Map"), export_path, "",
229                               "Enhanced Metafile (*.wmf)|*.wmf",
230                               wxSAVE|wxOVERWRITE_PROMPT)
231            if dlg.ShowModal() == wxID_OK:
232                self.export_path = os.path.dirname(dlg.GetPath())
233                dc = wxMetaFileDC(dlg.GetPath())
234        
235                scale, offset, mapregion = output_transform(self.scale,
236                                                            self.offset,
237                                                            self.GetSizeTuple(),
238                                                            dc.GetSizeTuple())
239    
240                selected_layer = self.selection.SelectedLayer()
241                selected_shapes = self.selection.SelectedShapes()
242    
243                renderer = ExportRenderer(dc, scale, offset)
244    
245                # Pass the entire bitmap as update region to the renderer.
246                # We're redrawing the whole bitmap, after all.
247                width, height = self.GetSizeTuple()
248                renderer.RenderMap(self.Map(),
249                                    (0,0,
250                                        (width/self.scale)*scale,
251                                        (height/self.scale)*scale),
252                                    mapregion,
253                                    selected_layer, selected_shapes)
254                dc.EndDrawing()
255                dc.Close()
256            dlg.Destroy()
257            
258      def Print(self):      def Print(self):
259          printer = wx.wxPrinter()          printer = wx.wxPrinter()
260          printout = MapPrintout(self.map)          width, height = self.GetSizeTuple()
261          printer.Print(self, printout, wx.true)          selected_layer = self.selection.SelectedLayer()
262            selected_shapes = self.selection.SelectedShapes()
263            
264            printout = MapPrintout(self, self.Map(), (0, 0, width, height),
265                                   selected_layer, selected_shapes)
266            printer.Print(self, printout, True)
267          printout.Destroy()          printout.Destroy()
268    
     def SetMap(self, map):  
         redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,  
                            LAYER_VISIBILITY_CHANGED)  
         if self.map is not None:  
             for channel in redraw_channels:  
                 self.map.Unsubscribe(channel, self.full_redraw)  
             self.map.Unsubscribe(MAP_PROJECTION_CHANGED,  
                                  self.projection_changed)  
         self.map = map  
         self.selection.ClearSelection()  
         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()  
   
     def Map(self):  
         """Return the map displayed by this canvas"""  
         return self.map  
   
269      def redraw(self, *args):      def redraw(self, *args):
270          self.Refresh(0)          self.Refresh(False)
271    
272      def full_redraw(self, *args):      def full_redraw(self, *args):
273          self.bitmap = None          self.bitmap = None
274          self.redraw()          self.redraw()
275    
276      def projection_changed(self, *args):      def map_projection_changed(self, map, old_proj):
277          self.FitMapToWindow()          ViewPort.map_projection_changed(self, map, old_proj)
278          self.full_redraw()          self.full_redraw()
279    
280      def set_view_transform(self, scale, offset):      def layer_projection_changed(self, *args):
281          self.scale = scale          ViewPort.layer_projection_changed(self, args)
         self.offset = offset  
282          self.full_redraw()          self.full_redraw()
283    
284      def proj_to_win(self, x, y):      def set_view_transform(self, scale, offset):
285          """\          ViewPort.set_view_transform(self, scale, offset)
286          Return the point in  window coords given by projected coordinates x y          self.full_redraw()
         """  
         offx, offy = self.offset  
         return (self.scale * x + offx, -self.scale * y + offy)  
   
     def win_to_proj(self, x, y):  
         """\  
         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)  
   
     def FitRectToWindow(self, rect):  
         """Fit the rectangular region given by rect into the window.  
   
         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  
         """  
         width, height = self.GetSizeTuple()  
         scale = self.scale * factor  
         offx, offy = self.offset  
         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)  
   
     def ZoomOutToRect(self, rect):  
         """Zoom out to fit the currently visible region into rect.  
   
         The rect parameter is given in window coordinates  
         """  
         # 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)  
   
         sx, sy, ex, ey = rect  
         scalex = (ex - sx) / (urx - llx)  
         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):  
         """Move the map by dx, dy pixels"""  
         offx, offy = self.offset  
         self.set_view_transform(self.scale, (offx + dx, offy + dy))  
   
     def SelectTool(self, tool):  
         """Make tool the active tool.  
   
         The parameter should be an instance of Tool or None to indicate  
         that no tool is active.  
         """  
         self.tool = tool  
   
     def ZoomInTool(self):  
         """Start the zoom in tool"""  
         self.SelectTool(ZoomInTool(self))  
   
     def ZoomOutTool(self):  
         """Start the zoom out tool"""  
         self.SelectTool(ZoomOutTool(self))  
   
     def PanTool(self):  
         """Start the pan tool"""  
         self.SelectTool(PanTool(self))  
   
     def IdentifyTool(self):  
         """Start the identify tool"""  
         self.SelectTool(IdentifyTool(self))  
   
     def LabelTool(self):  
         """Start the label tool"""  
         self.SelectTool(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  
   
     def CurrentPosition(self):  
         """Return current position of the mouse in projected coordinates.  
   
         The result is a 2-tuple of floats with the coordinates. If the  
         mouse is not in the window, the result is None.  
         """  
         if self.current_position is not None:  
             x, y = self.current_position  
             return self.win_to_proj(x, y)  
         else:  
             return None  
   
     def set_current_position(self, event):  
         """Set the current position from event  
287    
288          Should be called by all events that contain mouse positions      def GetPortSizeTuple(self):
289          especially EVT_MOTION. The event paramete may be None to          return self.GetSizeTuple()
         indicate the the pointer left the window.  
         """  
         if event is not None:  
             self.current_position = (event.m_x, event.m_y)  
         else:  
             self.current_position = None  
         self.issue(VIEW_POSITION)  
290    
291      def OnLeftDown(self, event):      def OnLeftDown(self, event):
292          self.set_current_position(event)          self.MouseLeftDown(event)
293          if self.tool is not None:          if self.tool is not None:
294              self.drag_dc = wxClientDC(self)              self.drag_dc = wxClientDC(self)
295              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wxINVERT)
296              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
             self.CaptureMouse()  
             self.tool.MouseDown(event)  
297              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
298              self.dragging = 1              self.dragging = 1
299    
300      def OnLeftUp(self, event):      def OnLeftUp(self, event):
301          self.set_current_position(event)          self.MouseLeftUp(event)
302          if self.dragging:          if self.dragging:
303              self.ReleaseMouse()              self.ReleaseMouse()
304              try:              try:
305                  self.tool.Hide(self.drag_dc)                  self.tool.Hide(self.drag_dc)
                 self.tool.MouseUp(event)  
306              finally:              finally:
307                  self.drag_dc = None                  self.drag_dc = None
308                  self.dragging = 0                  self.dragging = 0
309    
310      def OnMotion(self, event):      def OnMotion(self, event):
         self.set_current_position(event)  
311          if self.dragging:          if self.dragging:
312              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
313              self.tool.MouseMove(event)  
314            self.MouseMove(event)
315    
316            if self.dragging:
317              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
318    
319      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
# Line 648  class MapCanvas(wxWindow, Publisher): Line 336  class MapCanvas(wxWindow, Publisher):
336          # FIXME: We should perhaps try to limit the redraw to the are          # FIXME: We should perhaps try to limit the redraw to the are
337          # actually covered by the shapes before and after the selection          # actually covered by the shapes before and after the selection
338          # change.          # change.
339            ViewPort.shape_selected(self, layer, shape)
340          self.full_redraw()          self.full_redraw()
341    
342      def unprojected_rect_around_point(self, x, y, dist):      def GetTextExtent(self, text):
343          """return a rect dist pixels around (x, y) in unprojected corrdinates          dc = wxClientDC(self)
344            font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
345          The return value is a tuple (minx, miny, maxx, maxy) suitable a          dc.SetFont(font)
346          parameter to a layer's ShapesInRegion method.          return dc.GetTextExtent(text)
         """  
         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 + dist * dx, y + dist * 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  
   
         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.GetClassification().GetDefaultFill() \  
                      is not Color.Transparent  
             stroked = layer.GetClassification().GetDefaultLineColor() \  
                       is not Color.Transparent  
   
             layer_proj = layer.projection  
             if layer_proj is not None:  
                 inverse = layer_proj.Inverse  
             else:  
                 inverse = None  
   
             shapetype = layer.ShapeType()  
   
             select_shape = -1  
   
             # Determine the ids of the shapes that overlap a tiny area  
             # around the point. For layers containing points we have to  
             # choose a larger size of the box we're testing agains so  
             # that we take the size of the markers into account  
             # FIXME: Once the markers are more flexible this part has to  
             # become more flexible too, of course  
             if shapetype == SHAPETYPE_POINT:  
                 box = self.unprojected_rect_around_point(px, py, 5)  
             else:  
                 box = self.unprojected_rect_around_point(px, py, 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.selection.SelectedLayer()  
             shapes = []  
         else:  
             shapes = [shape]  
         self.selection.SelectShapes(layer, shapes)  
         return result  
347    
348      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y, text=None):
349          """Add or remove a label at window position x, y.          """Add or remove a label at window position x, y.
350    
351          If there's a label at the given position, remove it. Otherwise          If there's a label at the given position, remove it. Otherwise
352          determine the shape at the position, run the label dialog and          determine the shape at the position, run the label dialog and
353          unless the user cancels the dialog, add a laber.          unless the user cancels the dialog, add a label.
354          """          """
         ox = x; oy = y  
355          label_layer = self.map.LabelLayer()          label_layer = self.map.LabelLayer()
356          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
357          if layer is None and shape_index is not None:          if layer is None and shape_index is not None:
358              # a label was selected              ViewPort.LabelShapeAt(self, x, y)
             label_layer.RemoveLabel(shape_index)  
359          elif layer is not None:          elif layer is not None:
360              text = labeldialog.run_label_dialog(self, layer.table, shape_index)              text = labeldialog.run_label_dialog(self,
361              if text:                                                  layer.ShapeStore().Table(),
362                  proj = self.map.projection                                                  shape_index)
363                  if proj is not None:              ViewPort.LabelShapeAt(self, x, y, text)
                     map_proj = proj  
                 else:  
                     map_proj = None  
                 proj = layer.projection  
                 if proj is not None:  
                     layer_proj = proj  
                 else:  
                     layer_proj = None  
   
                 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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