/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 1271 by jonathan, Fri Jun 20 16:43:04 2003 UTC revision 1652 by bh, Mon Aug 25 15:59:58 2003 UTC
# Line 14  __version__ = "$Revision$" Line 14  __version__ = "$Revision$"
14    
15  from Thuban import _  from Thuban import _
16    
 import sys  
17  import os.path  import os.path
18    
19  from math import hypot  from wxPython.wx import wxWindow, \
   
 from wxPython.wx import wxWindow, wxYield,\  
20       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
21       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, \
22       wxBITMAP_TYPE_XPM, wxBeginBusyCursor, wxEndBusyCursor, wxCursor, \       wxPlatform, wxBeginBusyCursor, wxEndBusyCursor, wxFileDialog, wxSAVE, \
23       wxImageFromBitmap, wxPlatform       wxOVERWRITE_PROMPT, wxID_OK
24    
25  # Export related stuff  # Export related stuff
26  if wxPlatform == '__WXMSW__':  if wxPlatform == '__WXMSW__':
27      from wxPython.wx import wxMetaFileDC      from wxPython.wx import wxMetaFileDC
 from wxPython.wx import wxFileDialog, wxSAVE, wxOVERWRITE_PROMPT, wxID_OK  
28    
29  from wxPython import wx  from wxPython import wx
30    
31  from wxproj import point_in_polygon_shape, shape_centroid  from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
32         LAYER_VISIBILITY_CHANGED
 from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  
      LAYER_PROJECTION_CHANGED, \  
      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  
33    
 import resource  
   
 from selection import Selection  
34  from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer  from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
35    
36  import labeldialog  import labeldialog
37    
38  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION, \  from viewport import ViewPort, PanTool, output_transform
                      SCALE_CHANGED  
   
   
 #  
 #   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  
   
   
 class RectTool(Tool):  
   
     """Base class for tools that draw rectangles while dragging"""  
   
     def draw(self, dc):  
         sx, sy = self.start  
         cx, cy = self.current  
         dc.DrawRectangle(sx, sy, cx - sx, cy - sy)  
   
 class ZoomInTool(RectTool):  
   
     """The Zoom-In Tool"""  
   
     def Name(self):  
         return "ZoomInTool"  
   
     def proj_rect(self):  
         """return the rectangle given by start and current in projected  
         coordinates"""  
         sx, sy = self.start  
         cx, cy = self.current  
         left, top = self.view.win_to_proj(sx, sy)  
         right, bottom = self.view.win_to_proj(cx, cy)  
         return (min(left, right), min(top, bottom),  
                 max(left, right), max(top, bottom))  
39    
40      def MouseUp(self, event):  class CanvasPanTool(PanTool):
         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):  
41    
42      """The Pan Tool"""      """The Canvas 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()
# Line 203  class PanTool(Tool): Line 54  class PanTool(Tool):
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    
     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)  
   
   
57  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.wxPrintout):
58    
59      """      """
# Line 258  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          scale, offset, mapregion = OutputTransform(self.canvas.scale,          scale, offset, mapregion = output_transform(self.canvas.scale,
84                                                     self.canvas.offset,                                                      self.canvas.offset,
85                                                     self.canvas.GetSizeTuple(),                                                      self.canvas.GetSizeTuple(),
86                                                     self.GetPageSizePixels())                                                      self.GetPageSizePixels())
87          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
88          renderer = PrinterRenderer(dc, scale, offset, resolution = resy)          renderer = PrinterRenderer(dc, scale, offset, resolution = resy)
89          x, y, width, height = self.region          x, y, width, height = self.region
# Line 274  class MapPrintout(wx.wxPrintout): Line 96  class MapPrintout(wx.wxPrintout):
96                             self.selected_layer, self.selected_shapes)                             self.selected_layer, self.selected_shapes)
97          return True          return True
98    
99  class MapCanvas(wxWindow, Publisher):  class MapCanvas(wxWindow, ViewPort):
100    
101      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
102    
     # 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",  
                          "HasSelectedShapes": "selection",  
                          "SelectedShapes": "selection"}  
   
103      def __init__(self, parent, winid):      def __init__(self, parent, winid):
104          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
105          self.SetBackgroundColour(wxColour(255, 255, 255))          ViewPort.__init__(self)
   
         # the map displayed in this canvas. Set with SetMap()  
         self.map = None  
106    
107          # current map projection. should only differ from map.projection          self.SetBackgroundColour(wxColour(255, 255, 255))
         # when the map's projection is changing and we need access to the  
         # old projection.  
         self.current_map_proj = 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  
108    
109          # the bitmap serving as backing store          # the bitmap serving as backing store
110          self.bitmap = None          self.bitmap = None
111    
112          # the selection          self.backgroundColor = wx.wxWHITE_BRUSH
113          self.selection = Selection()  
114          self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)          # Set to true if there ever is an error during redraw. There
115            # should never be errors, but unfortunately bugs happen.
116          # keep track of which layers/shapes are selected to make sure we          self.error_on_redraw = 0
         # only redraw when necessary  
         self.last_selected_layer = None  
         self.last_selected_shape = None  
117    
118          # subscribe the WX events we're interested in          # subscribe the WX events we're interested in
119          EVT_PAINT(self, self.OnPaint)          EVT_PAINT(self, self.OnPaint)
# Line 342  class MapCanvas(wxWindow, Publisher): Line 122  class MapCanvas(wxWindow, Publisher):
122          EVT_MOTION(self, self.OnMotion)          EVT_MOTION(self, self.OnMotion)
123          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)
124          wx.EVT_SIZE(self, self.OnSize)          wx.EVT_SIZE(self, self.OnSize)
125            wx.EVT_IDLE(self, self.OnIdle)
126    
127      def __del__(self):      def __del__(self):
128          wxWindow.__del__(self)          wxWindow.__del__(self)
129          Publisher.__del__(self)          ViewPort.__del__(self)
   
     def Subscribe(self, channel, *args):  
         """Extend the inherited method to handle delegated messages.  
130    
131          If channel is one of the delegated messages call the appropriate      def PanTool(self):
132          object's Subscribe method. Otherwise just call the inherited          """Start the canvas pan tool"""
133          method.          self.SelectTool(CanvasPanTool(self))
134          """          
135          if channel in self.delegated_messages:      def SetMap(self, map):
136              object = getattr(self, self.delegated_messages[channel])          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
137              object.Subscribe(channel, *args)                             LAYER_VISIBILITY_CHANGED)
138          else:          if self.Map() is not None:
139              Publisher.Subscribe(self, channel, *args)              for channel in redraw_channels:
140                    self.Map().Unsubscribe(channel, self.full_redraw)
141    
142      def Unsubscribe(self, channel, *args):          ViewPort.SetMap(self, map)
         """Extend the inherited method to handle delegated messages.  
143    
144          If channel is one of the delegated messages call the appropriate          if self.Map() is not None:
145          object's Unsubscribe method. Otherwise just call the inherited              for channel in redraw_channels:
146          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)  
147    
148      def __getattr__(self, attr):          # force a redraw. If map is not empty, it's already been called
149          if attr in self.delegated_methods:          # by FitMapToWindow but if map is empty it hasn't been called
150              return getattr(getattr(self, self.delegated_methods[attr]), attr)          # yet so we have to explicitly call it.
151          raise AttributeError(attr)          self.full_redraw()
152    
153      def OnPaint(self, event):      def OnPaint(self, event):
154          dc = wxPaintDC(self)          dc = wxPaintDC(self)
         clear = self.map is None or not self.map.HasLayers()  
   
         wxBeginBusyCursor()  
         wxYield()  
155    
156          try:          if self.Map() is not None and self.Map().HasLayers():
157              if not clear:              if self.bitmap in (None, -1):
158                  self.do_redraw()                  # set the flag that we should redraw the
159                  try:                  # bitmap in idle time
160                      pass                  self.bitmap = -1
161                  except:              else:
162                      print "Error during drawing:", sys.exc_info()[0]                  # blit the bitmap to the screen
                     clear = True  
   
             if clear:  
                 # If we've got no map or if the map is empty, simply clear  
                 # the screen.  
   
                 # XXX it's probably possible to get rid of this. The  
                 # background color of the window is already white and the  
                 # only thing we may have to do is to call self.Refresh()  
                 # with a true argument in the right places.  
163                  dc.BeginDrawing()                  dc.BeginDrawing()
164                  dc.Clear()                  dc.DrawBitmap(self.bitmap, 0, 0)
165                  dc.EndDrawing()                  dc.EndDrawing()
166            else:
167                # If we've got no map or if the map is empty, simply clear
168                # the screen.
169    
170                # XXX it's probably possible to get rid of this. The
171                # background color of the window is already white and the
172                # only thing we may have to do is to call self.Refresh()
173                # with a true argument in the right places.
174                dc.BeginDrawing()
175                dc.SetBackground(self.backgroundColor)
176                dc.Clear()
177                dc.EndDrawing()
178    
179        def OnIdle(self, event):
180            """Idle handler. Redraw the bitmap if necessary"""
181    
182            if self.bitmap != -1:
183                return
184            if self.error_on_redraw:
185                return
186    
187            wxBeginBusyCursor()
188            try:
189                try:
190                    self._do_redraw()
191                except:
192                    self.error_on_redraw = True
193                    raise
194          finally:          finally:
195              wxEndBusyCursor()              wxEndBusyCursor()
196    
197      def do_redraw(self):      def _do_redraw(self):
198          # This should only be called if we have a non-empty map.          """Called by OnIdle to do the actual redraw.
199            """
         # Get the window size.  
200          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
201    
202          # If self.bitmap's still there, reuse it. Otherwise redraw it          bitmap = wx.wxEmptyBitmap(width, height)
203          if self.bitmap is not None:          dc = wx.wxMemoryDC()
204              bitmap = self.bitmap          dc.SelectObject(bitmap)
205          else:          dc.BeginDrawing()
             bitmap = wx.wxEmptyBitmap(width, height)  
             dc = wx.wxMemoryDC()  
             dc.SelectObject(bitmap)  
             dc.BeginDrawing()  
206    
207              # clear the background          dc.SetBackground(self.backgroundColor)
208              #dc.SetBrush(wx.wxWHITE_BRUSH)          dc.Clear()
             #dc.SetPen(wx.wxTRANSPARENT_PEN)  
             #dc.DrawRectangle(0, 0, width, height)  
             dc.SetBackground(wx.wxWHITE_BRUSH)  
             dc.Clear()  
209    
210              selected_layer = self.selection.SelectedLayer()          selected_layer = self.selection.SelectedLayer()
211              selected_shapes = self.selection.SelectedShapes()          selected_shapes = self.selection.SelectedShapes()
212    
213              # draw the map into the bitmap          # draw the map into the bitmap
214              renderer = ScreenRenderer(dc, self.scale, self.offset)          renderer = ScreenRenderer(dc, self.scale, self.offset)
215    
216              # Pass the entire bitmap as update region to the renderer.          # Pass the entire bitmap as update region to the renderer.
217              # We're redrawing the whole bitmap, after all.          # We're redrawing the whole bitmap, after all.
218              renderer.RenderMap(self.map, (0, 0, width, height),          renderer.RenderMap(self.Map(), (0, 0, width, height),
219                                 selected_layer, selected_shapes)                             selected_layer, selected_shapes)
220    
221              dc.EndDrawing()          dc.EndDrawing()
222              dc.SelectObject(wx.wxNullBitmap)          dc.SelectObject(wx.wxNullBitmap)
             self.bitmap = bitmap  
223    
224          # blit the bitmap to the screen          self.bitmap = bitmap
225          dc = wx.wxMemoryDC()          # This causes a paint event that then draws the bitmap
226          dc.SelectObject(bitmap)          self.redraw()
         clientdc = wxClientDC(self)  
         clientdc.BeginDrawing()  
         clientdc.Blit(0, 0, width, height, dc, 0, 0)  
         clientdc.EndDrawing()  
227    
228      def Export(self):      def Export(self):
         if self.scale == 0:  
             return  
229    
230          if hasattr(self, "export_path"):          if hasattr(self, "export_path"):
231              export_path = self.export_path              export_path = self.export_path
# Line 468  class MapCanvas(wxWindow, Publisher): Line 238  class MapCanvas(wxWindow, Publisher):
238              self.export_path = os.path.dirname(dlg.GetPath())              self.export_path = os.path.dirname(dlg.GetPath())
239              dc = wxMetaFileDC(dlg.GetPath())              dc = wxMetaFileDC(dlg.GetPath())
240            
241              scale, offset, mapregion = OutputTransform(self.scale,              scale, offset, mapregion = output_transform(self.scale,
242                                                         self.offset,                                                          self.offset,
243                                                         self.GetSizeTuple(),                                                          self.GetSizeTuple(),
244                                                         dc.GetSizeTuple())                                                          dc.GetSizeTuple())
245    
246              selected_layer = self.selection.SelectedLayer()              selected_layer = self.selection.SelectedLayer()
247              selected_shapes = self.selection.SelectedShapes()              selected_shapes = self.selection.SelectedShapes()
# Line 481  class MapCanvas(wxWindow, Publisher): Line 251  class MapCanvas(wxWindow, Publisher):
251              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
252              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
253              width, height = self.GetSizeTuple()              width, height = self.GetSizeTuple()
254              renderer.RenderMap(self.map,              renderer.RenderMap(self.Map(),
255                                  (0,0,                                  (0,0,
256                                      (width/self.scale)*scale,                                      (width/self.scale)*scale,
257                                      (height/self.scale)*scale),                                      (height/self.scale)*scale),
# Line 497  class MapCanvas(wxWindow, Publisher): Line 267  class MapCanvas(wxWindow, Publisher):
267          selected_layer = self.selection.SelectedLayer()          selected_layer = self.selection.SelectedLayer()
268          selected_shapes = self.selection.SelectedShapes()          selected_shapes = self.selection.SelectedShapes()
269                    
270          printout = MapPrintout(self, self.map, (0, 0, width, height),          printout = MapPrintout(self, self.Map(), (0, 0, width, height),
271                                 selected_layer, selected_shapes)                                 selected_layer, selected_shapes)
272          printer.Print(self, printout, True)          printer.Print(self, printout, True)
273          printout.Destroy()          printout.Destroy()
274    
     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.map_projection_changed)  
             self.map.Unsubscribe(LAYER_PROJECTION_CHANGED,  
                                  self.layer_projection_changed)  
         self.map = map  
         self.current_map_proj = self.map.GetProjection()  
         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.map_projection_changed)  
             self.map.Subscribe(LAYER_PROJECTION_CHANGED, self.layer_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  
   
275      def redraw(self, *args):      def redraw(self, *args):
276          self.Refresh(0)          self.Refresh(False)
277    
278      def full_redraw(self, *args):      def full_redraw(self, *args):
279          self.bitmap = None          self.bitmap = None
280          self.redraw()          self.redraw()
281    
282      def map_projection_changed(self, *args):      def map_projection_changed(self, map, old_proj):
283            ViewPort.map_projection_changed(self, map, old_proj)
         proj = self.current_map_proj  
         self.current_map_proj = self.map.GetProjection()  
   
         bbox = None  
   
         if proj is not None and self.current_map_proj is not None:  
             width, height = self.GetSizeTuple()  
             llx, lly = self.win_to_proj(0, height)  
             urx, ury = self.win_to_proj(width, 0)  
             bbox = proj.Inverse(llx, lly) + proj.Inverse(urx, ury)  
             bbox = self.current_map_proj.ForwardBBox(bbox)  
   
         if bbox is not None:  
             self.FitRectToWindow(bbox)  
         else:  
             self.FitMapToWindow()  
   
284          self.full_redraw()          self.full_redraw()
285    
286      def layer_projection_changed(self, *args):      def layer_projection_changed(self, *args):
287            ViewPort.layer_projection_changed(self, args)
288          self.full_redraw()          self.full_redraw()
289    
290      def set_view_transform(self, scale, offset):      def set_view_transform(self, scale, offset):
291          # width/height of the projected bbox          ViewPort.set_view_transform(self, scale, offset)
         llx, lly, urx, ury = bbox = self.map.ProjectedBoundingBox()  
         pwidth = float(urx - llx)  
         pheight = float(ury - lly)  
   
         # width/height of the window  
         wwidth, wheight = self.GetSizeTuple()  
   
         # The window's center in projected coordinates assuming the new  
         # scale/offset  
         pcenterx = (wwidth/2 - offset[0]) / scale  
         pcentery = (offset[1] - wheight/2) / scale  
   
         # The window coordinates used when drawing the shapes must fit  
         # into 16bit signed integers.  
         max_len = max(pwidth, pheight)  
         if max_len:  
             max_scale = 32000.0 / max_len  
         else:  
             # FIXME: What to do in this case? The bbox is effectively  
             # empty so any scale should work.  
             max_scale = scale  
   
         # The minimal scale is somewhat arbitrarily set to half that of  
         # the bbox fit into the window  
         scales = []  
         if pwidth:  
             scales.append(wwidth / pwidth)  
         if pheight:  
             scales.append(wheight / pheight)  
         if scales:  
             min_scale = 0.5 * min(scales)  
         else:  
             min_scale = scale  
   
         if scale > max_scale:  
             scale = max_scale  
         elif scale < min_scale:  
             scale = min_scale  
   
         self.scale = scale  
   
         # determine new offset to preserve the center  
         self.offset = (wwidth/2 - scale * pcenterx,  
                        wheight/2 + scale * pcentery)  
292          self.full_redraw()          self.full_redraw()
         self.issue(SCALE_CHANGED, scale)  
   
     def proj_to_win(self, x, y):  
         """\  
         Return the point in  window coords given by projected coordinates x y  
         """  
         if self.scale == 0:  
             return (0, 0)  
   
         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  
         """  
         if self.scale == 0:  
             return (0, 0)  
   
         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 width 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.  
         """  
         if self.map is not None:  
             bbox = self.map.ProjectedBoundingBox()  
             if bbox is not None:  
                 self.FitRectToWindow(bbox)  
   
     def FitLayerToWindow(self, layer):  
         """Fit the given layer to the window.  
   
         Set the scale so that the layer fits exactly into the window and  
         center it in the window.  
         """  
           
         bbox = layer.LatLongBoundingBox()  
         if bbox is not None:  
             proj = self.map.GetProjection()  
             if proj is not None:  
                 bbox = proj.ForwardBBox(bbox)  
   
             if bbox is not None:  
                 self.FitRectToWindow(bbox)  
   
     def FitSelectedToWindow(self):  
         layer = self.selection.SelectedLayer()  
         shapes = self.selection.SelectedShapes()  
   
         bbox = layer.ShapesBoundingBox(shapes)  
         if bbox is not None:  
             proj = self.map.GetProjection()  
             if proj is not None:  
                 bbox = proj.ForwardBBox(bbox)  
   
             if bbox is not None:  
                 if len(shapes) == 1 and layer.ShapeType() == SHAPETYPE_POINT:  
                     self.ZoomFactor(1, self.proj_to_win(bbox[0], bbox[1]))  
                 else:  
                     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  
         """  
         if self.scale > 0:  
             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))  
         #img = resource.GetImageResource("pan", wxBITMAP_TYPE_XPM)  
         #bmp = resource.GetBitmapResource("pan", wxBITMAP_TYPE_XPM)  
         #print bmp  
         #img = wxImageFromBitmap(bmp)  
         #print img  
         #cur = wxCursor(img)  
         #print cur  
         #self.SetCursor(cur)  
   
     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  
293    
294      def set_current_position(self, event):      def GetPortSizeTuple(self):
295          """Set the current position from event          return self.GetSizeTuple()
   
         Should be called by all events that contain mouse positions  
         especially EVT_MOTION. The event paramete may be None to  
         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)  
296    
297      def OnLeftDown(self, event):      def OnLeftDown(self, event):
298          self.set_current_position(event)          self.MouseLeftDown(event)
299          if self.tool is not None:          if self.tool is not None:
300              self.drag_dc = wxClientDC(self)              self.drag_dc = wxClientDC(self)
301              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wxINVERT)
302              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
             self.CaptureMouse()  
             self.tool.MouseDown(event)  
303              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
304                self.CaptureMouse()
305              self.dragging = 1              self.dragging = 1
306    
307      def OnLeftUp(self, event):      def OnLeftUp(self, event):
308          self.set_current_position(event)          """Handle EVT_LEFT_UP
309    
310            Release the mouse if it was captured, if a tool is active call
311            its Hide method and call self.MouseLeftUp.
312            """
313            # It's important that ReleaseMouse is called before MouseLeftUp.
314            # MouseLeftUp may pop up modal dialogs which leads to an
315            # effectively frozen X session because the user can only
316            # interact with the dialog but the mouse is still grabbed by the
317            # canvas.
318          if self.dragging:          if self.dragging:
319              self.ReleaseMouse()              if self.HasCapture():
320                    self.ReleaseMouse()
321              try:              try:
322                  self.tool.Hide(self.drag_dc)                  self.tool.Hide(self.drag_dc)
                 self.tool.MouseUp(event)  
323              finally:              finally:
324                  self.drag_dc = None                  self.drag_dc = None
325                  self.dragging = 0                  self.dragging = 0
326            self.MouseLeftUp(event)
327    
328      def OnMotion(self, event):      def OnMotion(self, event):
         self.set_current_position(event)  
329          if self.dragging:          if self.dragging:
330              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
331              self.tool.MouseMove(event)  
332            self.MouseMove(event)
333    
334            if self.dragging:
335              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
336    
337      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
# Line 841  class MapCanvas(wxWindow, Publisher): Line 345  class MapCanvas(wxWindow, Publisher):
345          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
346          # could be reused.          # could be reused.
347          self.full_redraw()          self.full_redraw()
         pass  
348    
349      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
350          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
# Line 851  class MapCanvas(wxWindow, Publisher): Line 354  class MapCanvas(wxWindow, Publisher):
354          # FIXME: We should perhaps try to limit the redraw to the are          # FIXME: We should perhaps try to limit the redraw to the are
355          # actually covered by the shapes before and after the selection          # actually covered by the shapes before and after the selection
356          # change.          # change.
357            ViewPort.shape_selected(self, layer, shape)
358          self.full_redraw()          self.full_redraw()
359    
360      def unprojected_rect_around_point(self, x, y, dist):      def GetTextExtent(self, text):
361          """return a rect dist pixels around (x, y) in unprojected corrdinates          dc = wxClientDC(self)
362            font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
363          The return value is a tuple (minx, miny, maxx, maxy) suitable a          dc.SetFont(font)
364          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  
365    
366          xs = []      def LabelShapeAt(self, x, y, text=None):
         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  
   
         if scale == 0:  
             return None, None  
   
         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:  
                     shapefile = layer.ShapeStore().Shapefile().cobject()  
                     result = point_in_polygon_shape(shapefile, 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:  
                     shapefile = layer.ShapeStore().Shapefile().cobject()  
                     result = point_in_polygon_shape(shapefile,  
                                                     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  
   
     def LabelShapeAt(self, x, y):  
367          """Add or remove a label at window position x, y.          """Add or remove a label at window position x, y.
368    
369          If there's a label at the given position, remove it. Otherwise          If there's a label at the given position, remove it. Otherwise
370          determine the shape at the position, run the label dialog and          determine the shape at the position, run the label dialog and
371          unless the user cancels the dialog, add a laber.          unless the user cancels the dialog, add a label.
372          """          """
         ox = x; oy = y  
373          label_layer = self.map.LabelLayer()          label_layer = self.map.LabelLayer()
374          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
375          if layer is None and shape_index is not None:          if layer is None and shape_index is not None:
376              # a label was selected              ViewPort.LabelShapeAt(self, x, y)
             label_layer.RemoveLabel(shape_index)  
377          elif layer is not None:          elif layer is not None:
378              text = labeldialog.run_label_dialog(self,              text = labeldialog.run_label_dialog(self,
379                                                  layer.ShapeStore().Table(),                                                  layer.ShapeStore().Table(),
380                                                  shape_index)                                                  shape_index)
381              if text:              ViewPort.LabelShapeAt(self, x, y, text)
                 proj = self.map.projection  
                 if proj is not None:  
                     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:  
                     shapefile = layer.ShapeStore().Shapefile().cobject()  
                     x, y = shape_centroid(shapefile, 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)  
   
 def OutputTransform(canvas_scale, canvas_offset, canvas_size, device_extend):  
     """Calculate dimensions to transform canvas content to output device."""  
     width, height = device_extend  
   
     # Only 80 % of the with are available for the map  
     width = width * 0.8  
   
     # Define the distance of the map from DC border  
     distance = 20  
   
     if height < width:  
         # landscape  
         map_height = height - 2*distance  
         map_width = map_height  
     else:  
         # portrait, recalibrate width (usually the legend width is too  
         # small  
         width = width * 0.9  
         map_height = width - 2*distance  
         map_width = map_height  
       
     mapregion = (distance, distance,  
                  distance+map_width, distance+map_height)  
   
     canvas_width, canvas_height = canvas_size  
       
     scalex = map_width / (canvas_width/canvas_scale)  
     scaley = map_height / (canvas_height/canvas_scale)  
     scale = min(scalex, scaley)  
     canvas_offx, canvas_offy = canvas_offset  
     offx = scale*canvas_offx/canvas_scale  
     offy = scale*canvas_offy/canvas_scale  
   
     return scale, (offx, offy), mapregion  
Legend:
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