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trunk/thuban/Thuban/UI/view.py revision 125 by bh, Thu May 2 18:55:33 2002 UTC branches/WIP-pyshapelib-bramz/Thuban/UI/view.py revision 2734 by bramz, Thu Mar 1 12:42:59 2007 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # opyright (c) 2001, 2002, 2003, 2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Frank Koormann <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 9  Line 10 
10  Classes for display of a map and interaction with it  Classes for display of a map and interaction with it
11  """  """
12    
13  __version__ = "$Revision$"  from __future__ import generators
   
 from math import hypot  
14    
15  from wxPython.wx import wxWindow,\  __version__ = "$Revision$"
16       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\  # $Source$
17       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW  # $Id$
18    
19    import os.path
20    import time
21    import traceback
22    
23  from wxPython import wx  import wx
24    
25  from wxproj import point_in_polygon_shape, shape_centroid  # Export related stuff
26    if wx.Platform == '__WXMSW__':
27        from wx import MetaFileDC
28    
29    from Thuban import _
30    
31  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
32       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED       LAYER_VISIBILITY_CHANGED
 from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  
      SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT  
 from Thuban.Lib.connector import Publisher  
33    
34  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
35    
36  import labeldialog  import labeldialog
37    
38  from messages import SELECTED_SHAPE, VIEW_POSITION  from viewport import ViewPort, PanTool, output_transform
   
   
 #  
 #   The tools  
 #  
   
 class Tool:  
39    
40      """  class CanvasPanTool(PanTool):
     Base class for the interactive tools  
     """  
41    
42      def __init__(self, view):      """The Canvas Pan Tool"""
         """Intitialize the tool. The view is the canvas displaying the map"""  
         self.view = view  
         self.start = self.current = None  
         self.dragging = 0  
         self.drawn = 0  
   
     def Name(self):  
         """Return the tool's name"""  
         return ''  
   
     def drag_start(self, x, y):  
         self.start = self.current = x, y  
         self.dragging = 1  
   
     def drag_move(self, x, y):  
         self.current = x, y  
   
     def drag_stop(self, x, y):  
         self.current = x, y  
         self.dragging = 0  
   
     def Show(self, dc):  
         if not self.drawn:  
             self.draw(dc)  
         self.drawn = 1  
   
     def Hide(self, dc):  
         if self.drawn:  
             self.draw(dc)  
         self.drawn = 0  
   
     def draw(self, dc):  
         pass  
   
     def MouseDown(self, event):  
         self.drag_start(event.m_x, event.m_y)  
43    
44      def MouseMove(self, event):      def MouseMove(self, event):
45          if self.dragging:          if self.dragging:
46              self.drag_move(event.m_x, event.m_y)              PanTool.MouseMove(self, event)
   
     def MouseUp(self, event):  
         if self.dragging:  
             self.drag_move(event.m_x, event.m_y)  
   
     def Cancel(self):  
         self.dragging = 0  
   
   
 class RectTool(Tool):  
   
     """Base class for tools that draw rectangles while dragging"""  
   
     def draw(self, dc):  
         sx, sy = self.start  
         cx, cy = self.current  
         dc.DrawRectangle(sx, sy, cx - sx, cy - sy)  
   
 class ZoomInTool(RectTool):  
   
     """The Zoom-In Tool"""  
   
     def Name(self):  
         return "ZoomInTool"  
   
     def proj_rect(self):  
         """return the rectangle given by start and current in projected  
         coordinates"""  
         sx, sy = self.start  
         cx, cy = self.current  
         left, top = self.view.win_to_proj(sx, sy)  
         right, bottom = self.view.win_to_proj(cx, cy)  
         return (min(left, right), min(top, bottom),  
                 max(left, right), max(top, bottom))  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
47              sx, sy = self.start              sx, sy = self.start
             cx, cy = self.current  
             if sx == cx and sy == cy:  
                 # Just a mouse click. Simply zoom in by a factor of two  
                 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 and sy == cy:  
                 # Just a mouse click. Simply zoom out by a factor of two  
                 self.view.ZoomFactor(0.5, center = (cy, 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"  
   
     def MouseMove(self, event):  
         if self.dragging:  
             x0, y0 = self.current  
             Tool.MouseMove(self, event)  
48              x, y = self.current              x, y = self.current
49              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
             dc = self.view.drag_dc  
             dc.Blit(0, 0, width, height, dc, x0 - x, y0 - y)  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             self.view.Translate(cx - sx, cy - sy)  
           
 class IdentifyTool(Tool):  
   
     """The "Identify" Tool"""  
       
     def Name(self):  
         return "IdentifyTool"  
   
     def MouseUp(self, event):  
         self.view.SelectShapeAt(event.m_x, event.m_y)  
   
   
 class LabelTool(Tool):  
   
     """The "Label" Tool"""  
   
     def Name(self):  
         return "LabelTool"  
   
     def MouseUp(self, event):  
         self.view.LabelShapeAt(event.m_x, event.m_y)  
   
50    
51                bitmapdc = wx.MemoryDC()
52                bitmapdc.SelectObject(self.view.PreviewBitmap())
53    
54                dc = self.view.drag_dc
55                dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
56    
57  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.Printout):
58    
59      """      """
60      wxPrintout class for printing Thuban maps      wxPrintout class for printing Thuban maps
61      """      """
62    
63      def __init__(self, map):      def __init__(self, canvas, map, region, selected_layer, selected_shapes):
64          wx.wxPrintout.__init__(self)          wx.Printout.__init__(self)
65            self.canvas = canvas
66          self.map = map          self.map = map
67            self.region = region
68            self.selected_layer = selected_layer
69            self.selected_shapes = selected_shapes
70    
71      def GetPageInfo(self):      def GetPageInfo(self):
72          return (1, 1, 1, 1)          return (1, 1, 1, 1)
# Line 227  class MapPrintout(wx.wxPrintout): Line 80  class MapPrintout(wx.wxPrintout):
80    
81      def draw_on_dc(self, dc):      def draw_on_dc(self, dc):
82          width, height = self.GetPageSizePixels()          width, height = self.GetPageSizePixels()
83          llx, lly, urx, ury = self.map.ProjectedBoundingBox()          scale, offset, mapregion = output_transform(self.canvas.scale,
84          scalex = width / (urx - llx)                                                      self.canvas.offset,
85          scaley = height / (ury - lly)                                                      self.canvas.GetSizeTuple(),
86          scale = min(scalex, scaley)                                                      self.GetPageSizePixels())
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
   
87          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
88          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          canvas_scale = self.canvas.scale
89          renderer.RenderMap(self.map)          x, y, width, height = self.region
90          return wx.true          renderer = PrinterRenderer(dc, self.map, scale, offset,
91                                               region = (mapregion[0], mapregion[1],
92                                                 (width/canvas_scale)*scale,
93                                                 (height/canvas_scale)*scale),
94                                       resolution = resy,
95                                       destination_region = mapregion)
96            renderer.RenderMap(self.selected_layer, self.selected_shapes)
97            return True
98    
99    
100  class MapCanvas(wxWindow, Publisher):  class MapCanvas(wx.Window, ViewPort):
101    
102      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
103    
104      def __init__(self, parent, winid, interactor):      def __init__(self, parent, winid):
105          wxWindow.__init__(self, parent, winid)          wx.Window.__init__(self, parent, winid)
106          self.SetBackgroundColour(wxColour(255, 255, 255))          ViewPort.__init__(self)
107    
108          # the map displayed in this canvas. Set with SetMap()          self.SetBackgroundColour(wx.Colour(255, 255, 255))
         self.map = None  
   
         # scale and offset describe the transformation from projected  
         # coordinates to window coordinates.  
         self.scale = 1.0  
         self.offset = (0, 0)  
   
         # whether the user is currently dragging the mouse, i.e. moving  
         # the mouse while pressing a mouse button  
         self.dragging = 0  
   
         # the currently active tool  
         self.tool = None  
   
         # The current mouse position of the last OnMotion event or None  
         # if the mouse is outside the window.  
         self.current_position = None  
   
   
         # If true, OnIdle will call do_redraw to do the actual  
         # redrawing. Set by OnPaint to avoid some unnecessary redraws.  
         # To force a redraw call full_redraw().  
         self.redraw_on_idle = 0  
109    
110          # the bitmap serving as backing store          # the bitmap serving as backing store
111          self.bitmap = None          self.bitmap = None
112            # the monochrome bitmap with the selection if any
113            self.selection_bitmap = None
114    
115          # the interactor          self.backgroundColor = wx.WHITE_BRUSH
116          self.interactor = interactor  
117          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          # The rendering iterator object. Used when rendering
118            # incrementally
119            self.render_iter = None
120    
121          # subscribe the WX events we're interested in          # subscribe the WX events we're interested in
122          EVT_PAINT(self, self.OnPaint)          self.Bind(wx.EVT_PAINT, self.OnPaint)
123          EVT_LEFT_DOWN(self, self.OnLeftDown)          self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
124          EVT_LEFT_UP(self, self.OnLeftUp)          self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
125          EVT_MOTION(self, self.OnMotion)          self.Bind(wx.EVT_MIDDLE_DOWN, self.OnMiddleDown)
126          EVT_LEAVE_WINDOW(self, self.OnLeaveWindow)          self.Bind(wx.EVT_MIDDLE_UP, self.OnMiddleUp)
127          wx.EVT_SIZE(self, self.OnSize)          self.Bind(wx.EVT_MOTION, self.OnMotion)
128          wx.EVT_IDLE(self, self.OnIdle)          self.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeaveWindow)
129            self.Bind(wx.EVT_SIZE, self.OnSize)
130            self.Bind(wx.EVT_IDLE, self.OnIdle)
131    
132      def __del__(self):      def __del__(self):
133          wxWindow.__del__(self)          wx.Window.__del__(self)
134          Publisher.__del__(self)          ViewPort.__del__(self)
135    
136        def PreviewBitmap(self):
137            return self.bitmap
138    
139        def PanTool(self):
140            """Start the canvas pan tool"""
141            self.SelectTool(CanvasPanTool(self))
142    
143        def SetMap(self, map):
144            redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
145                               LAYER_VISIBILITY_CHANGED)
146            if self.Map() is not None:
147                for channel in redraw_channels:
148                    self.Map().Unsubscribe(channel, self.full_redraw)
149    
150            ViewPort.SetMap(self, map)
151    
152            if self.Map() is not None:
153                for channel in redraw_channels:
154                    self.Map().Subscribe(channel, self.full_redraw)
155    
156            # force a redraw. If map is not empty, it's already been called
157            # by FitMapToWindow but if map is empty it hasn't been called
158            # yet so we have to explicitly call it.
159            self.full_redraw()
160    
161      def OnPaint(self, event):      def OnPaint(self, event):
162          dc = wxPaintDC(self)          dc = wx.PaintDC(self)
163          if self.map is not None and self.map.HasLayers():          if self.Map() is not None and self.Map().HasLayers():
164              # We have a non-empty map. Redraw it in idle time              if self.bitmap is not None:
165              self.redraw_on_idle = 1                  dc.BeginDrawing()
166                    dc.DrawBitmap(self.bitmap, 0, 0)
167                    if self.selection_bitmap is not None:
168                        dc.DrawBitmap(self.selection_bitmap, 0, 0, True)
169                    dc.EndDrawing()
170          else:          else:
171              # If we've got no map or if the map is empty, simply clear              # If we've got no map or if the map is empty, simply clear
172              # the screen.              # the screen.
173                
174              # XXX it's probably possible to get rid of this. The              # XXX it's probably possible to get rid of this. The
175              # background color of the window is already white and the              # background color of the window is already white and the
176              # only thing we may have to do is to call self.Refresh()              # only thing we may have to do is to call self.Refresh()
177              # with a true argument in the right places.              # with a true argument in the right places.
178              dc.BeginDrawing()              dc.BeginDrawing()
179              dc.Clear()                          dc.SetBackground(self.backgroundColor)
180                dc.Clear()
181              dc.EndDrawing()              dc.EndDrawing()
182    
183      def do_redraw(self):      def OnIdle(self, event):
184          # This should only be called if we have a non-empty map. We draw          """Idle handler. Redraw the bitmap if necessary"""
185          # it into a memory DC and then blit it to the screen.          if (self.Map() is not None
186                and (self.bitmap is None
187                     or self.render_iter is not None
188                     or (self.HasSelectedShapes()
189                         and self.selection_bitmap is None))):
190                event.RequestMore(self._do_redraw())
191    
192        def _do_redraw(self):
193            """Redraw a bit and return whether this method has to be called again.
194    
195            Called by OnIdle to handle the actual redraw. Redraw is
196            incremental for both the bitmap with the normal layers and the
197            bitmap with the selection.
198            """
199            finished = False
200            if self.render_iter is not None:
201                try:
202                    if self.render_iter.next():
203                        # Redraw if the last preview redraw was some time
204                        # ago and the user is not currently dragging the
205                        # mouse because redrawing would interfere with what
206                        # the current tool is drawing on the window.
207                        if not self.dragging \
208                               and time.time() - self.render_last_preview > 0.5:
209                            client_dc = wx.ClientDC(self)
210                            client_dc.BeginDrawing()
211                            client_dc.DrawBitmap(self.bitmap, 0, 0)
212                            client_dc.EndDrawing()
213                            self.render_last_preview = time.time()
214                    else:
215                        self.render_iter = None
216                        # Redraw if not dragging because redrawing would
217                        # interfere with what the current tool is drawing on
218                        # the window.
219                        if not self.dragging:
220                            self.redraw()
221                        finished = True
222                except StopIteration:
223                    finished = True
224                    self.render_iter = None
225                except:
226                    finished = True
227                    self.render_iter = None
228                    traceback.print_exc()
229            else:
230                self.render_iter = self._render_iterator()
231                self.render_last_preview = time.time()
232            return not finished
233    
234        def _render_iterator(self):
235          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
236            dc = wx.MemoryDC()
237    
238          # If self.bitmap's still there, reuse it. Otherwise redraw it          render_start = time.time()
239          if self.bitmap is not None:  
240              bitmap = self.bitmap          if self.bitmap is None:
241          else:              self.bitmap = wx.EmptyBitmap(width, height)
242              bitmap = wx.wxEmptyBitmap(width, height)              dc.SelectObject(self.bitmap)
             dc = wx.wxMemoryDC()  
             dc.SelectObject(bitmap)  
243              dc.BeginDrawing()              dc.BeginDrawing()
244    
245              # clear the background              dc.SetBackground(self.backgroundColor)
246              dc.SetBrush(wx.wxWHITE_BRUSH)              dc.Clear()
             dc.SetPen(wx.wxTRANSPARENT_PEN)  
             dc.DrawRectangle(0, 0, width, height)  
   
             if 1: #self.interactor.selected_map is self.map:  
                 selected_layer = self.interactor.selected_layer  
                 selected_shape = self.interactor.selected_shape  
             else:  
                 selected_layer = None  
                 selected_shape = None  
247    
248              # draw the map into the bitmap              # draw the map into the bitmap
249              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
250              renderer.RenderMap(self.map, selected_layer, selected_shape)                                        (0, 0, width, height))
251                for cont in renderer.RenderMapIncrementally():
252                    yield True
253    
254              dc.EndDrawing()              dc.EndDrawing()
255              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.NullBitmap)
             self.bitmap = bitmap  
256    
257          # blit the bitmap to the screen          if self.HasSelectedShapes() and self.selection_bitmap is None:
258          dc = wx.wxMemoryDC()              bitmap = wx.EmptyBitmap(width, height)
259          dc.SelectObject(bitmap)              dc.SelectObject(bitmap)
260          clientdc = wxClientDC(self)              dc.BeginDrawing()
261          clientdc.BeginDrawing()              dc.SetBackground(wx.WHITE_BRUSH)
262          clientdc.Blit(0, 0, width, height, dc, 0, 0)              dc.Clear()
         clientdc.EndDrawing()  
   
     def Print(self):  
         printer = wx.wxPrinter()  
         printout = MapPrintout(self.map)  
         printer.Print(self, printout, wx.true)  
         printout.Destroy()  
           
     def SetMap(self, map):  
         redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_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  
         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 self.map  
   
     def redraw(self, *args):  
         self.Refresh(0)  
263    
264      def full_redraw(self, *args):              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
265          self.bitmap = None                                        (0, 0, width, height))
266          self.redraw()              layer = self.SelectedLayer()
267                shapes = self.selection.SelectedShapes()
268                for cont in renderer.draw_selection_incrementally(layer, shapes):
269                    yield True
270    
271      def projection_changed(self, *args):              dc.EndDrawing()
272          self.FitMapToWindow()              dc.SelectObject(wx.NullBitmap)
         self.full_redraw()  
273    
274      def set_view_transform(self, scale, offset):              bitmap.SetMask(wx.Mask(bitmap, wx.WHITE))
275          self.scale = scale              self.selection_bitmap = bitmap
         self.offset = offset  
         self.full_redraw()  
276    
277      def proj_to_win(self, x, y):          yield False
         """\  
         Return the point in  window coords given by projected coordinates x y  
         """  
         offx, offy = self.offset  
         return (self.scale * x + offx, -self.scale * y + offy)  
278    
279      def win_to_proj(self, x, y):      def Export(self):
         """\  
         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)  
280    
281      def FitRectToWindow(self, rect):          if hasattr(self, "export_path"):
282          width, height = self.GetSizeTuple()              export_path = self.export_path
         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):  
         """\  
         Set the scale and offset so that the map is centered in the  
         window  
         """  
         bbox = self.map.ProjectedBoundingBox()  
         if bbox is not None:  
             self.FitRectToWindow(bbox)  
   
     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  
283          else:          else:
284              cx = width / 2              export_path="."
285              cy = height / 2          dlg = wx.FileDialog(self, _("Export Map"), export_path, "",
286          offset = (factor * (offx - cx) + width / 2,                             "Enhanced Metafile (*.wmf)|*.wmf",
287                    factor * (offy - cy) + height / 2)                             wx.SAVE|wx.OVERWRITE_PROMPT)
288          self.set_view_transform(scale, offset)          if dlg.ShowModal() == wx.ID_OK:
289                self.export_path = os.path.dirname(dlg.GetPath())
290                dc = wx.MetaFileDC(dlg.GetPath())
291    
292                scale, offset, mapregion = output_transform(self.scale,
293                                                            self.offset,
294                                                            self.GetSizeTuple(),
295                                                            dc.GetSizeTuple())
296    
297                selected_layer = self.selection.SelectedLayer()
298                selected_shapes = self.selection.SelectedShapes()
299    
300                width, height = self.GetSizeTuple()
301                renderer = ExportRenderer(dc, self.Map(), scale, offset,
302                                          region = (0, 0,
303                                                    (width/self.scale)*scale,
304                                                    (height/self.scale)*scale),
305                                          destination_region = mapregion)
306                renderer.RenderMap(selected_layer, selected_shapes)
307    
308      def ZoomOutToRect(self, rect):              dc.EndDrawing()
309          # rect is given in window coordinates              dc.Close()
310            dlg.Destroy()
311    
312          # determine the bbox of the displayed region in projected      def Print(self):
313          # coordinates          printer = wx.Printer()
314          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
315          llx, lly = self.win_to_proj(0, height - 1)          selected_layer = self.selection.SelectedLayer()
316          urx, ury = self.win_to_proj(width - 1, 0)          selected_shapes = self.selection.SelectedShapes()
   
         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):  
         offx, offy = self.offset  
         self.set_view_transform(self.scale, (offx + dx, offy + dy))  
   
     def ZoomInTool(self):  
         self.tool = ZoomInTool(self)  
317    
318      def ZoomOutTool(self):          printout = MapPrintout(self, self.Map(), (0, 0, width, height),
319          self.tool = ZoomOutTool(self)                                 selected_layer, selected_shapes)
320            printer.Print(self, printout, True)
321            printout.Destroy()
322    
323      def PanTool(self):      def redraw(self, *args):
324          self.tool = PanTool(self)          self.Refresh(False)
325    
326      def IdentifyTool(self):      def full_redraw(self, *args):
327          self.tool = IdentifyTool(self)          self.bitmap = None
328            self.selection_bitmap = None
329            self.render_iter = None
330            self.redraw()
331    
332      def LabelTool(self):      def redraw_selection(self, *args):
333          self.tool = LabelTool(self)          self.selection_bitmap = None
334            self.render_iter = None
335            self.redraw()
336    
337      def CurrentTool(self):      def map_projection_changed(self, map, old_proj):
338          return self.tool and self.tool.Name() or None          ViewPort.map_projection_changed(self, map, old_proj)
339            self.full_redraw()
340    
341      def CurrentPosition(self):      def layer_projection_changed(self, *args):
342          """Return current position of the mouse in projected coordinates.          ViewPort.layer_projection_changed(self, args)
343            self.full_redraw()
344    
345          The result is a 2-tuple of floats with the coordinates. If the      def set_view_transform(self, scale, offset):
346          mouse is not in the window, the result is None.          ViewPort.set_view_transform(self, scale, offset)
347          """          self.full_redraw()
         if self.current_position is not None:  
             x, y = self.current_position  
             return self.win_to_proj(x, y)  
         else:  
             return None  
348    
349      def set_current_position(self, event):      def GetPortSizeTuple(self):
350          """Set the current position from event          return self.GetSizeTuple()
351    
352          Should be called by all events that contain mouse positions      def OnMiddleDown(self, event):
353          especially EVT_MOTION. The event paramete may be None to          self.remembertool = self.tool
354          indicate the the pointer left the window.          if self.Map() is not None and self.Map().HasLayers():
355          """              self.PanTool()
356          if event is not None:              self.OnLeftDown(event)
357              self.current_position = (event.m_x, event.m_y)  
358          else:      def OnMiddleUp(self, event):
359              self.current_position = None          self.OnLeftUp(event)
360          self.issue(VIEW_POSITION)          if self.remembertool:
361                self.SelectTool(self.remembertool)
362    
363      def OnLeftDown(self, event):      def OnLeftDown(self, event):
364          self.set_current_position(event)          self.MouseLeftDown(event)
365          if self.tool is not None:          if self.tool is not None:
366              self.drag_dc = wxClientDC(self)              self.drag_dc = wx.ClientDC(self)
367              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wx.INVERT)
368              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)              self.drag_dc.SetBrush(wx.TRANSPARENT_BRUSH)
             self.CaptureMouse()  
             self.tool.MouseDown(event)  
369              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
370                self.CaptureMouse()
371              self.dragging = 1              self.dragging = 1
372            
373      def OnLeftUp(self, event):      def OnLeftUp(self, event):
374          self.ReleaseMouse()          """Handle EVT_LEFT_UP
375          self.set_current_position(event)  
376            Release the mouse if it was captured, if a tool is active call
377            its Hide method and call self.MouseLeftUp.
378            """
379            # It's important that ReleaseMouse is called before MouseLeftUp.
380            # MouseLeftUp may pop up modal dialogs which leads to an
381            # effectively frozen X session because the user can only
382            # interact with the dialog but the mouse is still grabbed by the
383            # canvas.
384          if self.dragging:          if self.dragging:
385              self.tool.Hide(self.drag_dc)              if self.HasCapture():
386              self.tool.MouseUp(event)                  self.ReleaseMouse()
387              self.drag_dc = None              try:
388          self.dragging = 0                  self.tool.Hide(self.drag_dc)
389                finally:
390                    self.drag_dc = None
391                    self.dragging = 0
392            self.MouseLeftUp(event)
393    
394      def OnMotion(self, event):      def OnMotion(self, event):
         self.set_current_position(event)  
395          if self.dragging:          if self.dragging:
396              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
397              self.tool.MouseMove(event)  
398            self.MouseMove(event)
399    
400            if self.dragging:
401              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
402    
403      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
404          self.set_current_position(None)          self.set_current_position(None)
405    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
406      def OnSize(self, event):      def OnSize(self, event):
407          # the window's size has changed. We have to get a new bitmap. If          # the window's size has changed. We have to get a new bitmap. If
408          # we want to be clever we could try to get by without throwing          # we want to be clever we could try to get by without throwing
# Line 562  class MapCanvas(wxWindow, Publisher): Line 413  class MapCanvas(wxWindow, Publisher):
413          self.full_redraw()          self.full_redraw()
414    
415      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
416          self.full_redraw()          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
417            # The selection object takes care that it only issues
418      def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):          # SHAPES_SELECTED messages when the set of selected shapes has
419          """Determine the shape at point px, py in window coords          # actually changed, so we can do a full redraw of the
420            # selection_bitmap unconditionally.
421          Return the shape and the corresponding layer as a tuple (layer,          ViewPort.shape_selected(self, layer, shape)
422          shape).          self.redraw_selection()
423    
424          If the optional parameter select_labels is true (default false)      def GetTextExtent(self, text):
425          search through the labels. If a label is found return it's index          dc = wx.ClientDC(self)
426          as the shape and None as the layer.          font = wx.Font(10, wx.SWISS, wx.NORMAL, wx.NORMAL)
427            dc.SetFont(font)
428          If the optional parameter selected_layer is true (default), only          return dc.GetTextExtent(text.decode('iso-8859-1'))
429          search in the currently selected layer.  
430        def LabelShapeAt(self, x, y, text=None):
431            """Add or remove a label at window position x, y.
432    
433            If there's a label at the given position, remove it. Otherwise
434            determine the shape at the position, run the label dialog and
435            unless the user cancels the dialog, add a label.
436          """          """
         map_proj = self.map.projection  
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
   
         scale = self.scale  
         offx, offy = self.offset  
   
         if select_labels:  
             labels = self.map.LabelLayer().Labels()  
               
             if labels:  
                 dc = wxClientDC(self)  
                 font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)  
                 dc.SetFont(font)  
                 for i in range(len(labels) - 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 selected_layer:  
             layer = self.interactor.SelectedLayer()  
             if layer is not None:  
                 layers = [layer]  
             else:  
                 # no layer selected. Use an empty list to effectively  
                 # ignore all layers.  
                 layers = []  
         else:  
             layers = self.map.Layers()  
   
         for layer_index in range(len(layers) - 1, -1, -1):  
             layer = layers[layer_index]  
   
             # search only in visible layers  
             if not layer.Visible():  
                 continue  
   
             filled = layer.fill is not None  
             stroked = layer.stroke is not None  
                   
             layer_proj = layer.projection  
             if layer_proj is not None:  
                 inverse = layer_proj.Inverse  
             else:  
                 inverse = None  
                   
             shapetype = layer.ShapeType()  
   
             select_shape = -1  
             if shapetype == SHAPETYPE_POLYGON:  
                 for i in range(layer.NumShapes() - 1, -1, -1):  
                     result = point_in_polygon_shape(layer.shapefile.cobject(),  
                                                     i,  
                                                     filled, stroked,  
                                                     map_proj, layer_proj,  
                                                     scale, -scale, offx, offy,  
                                                     px, py)  
                     if result:  
                         select_shape = i  
                         break  
             elif shapetype == SHAPETYPE_ARC:  
                 for i in range(layer.NumShapes() - 1, -1, -1):  
                     result = point_in_polygon_shape(layer.shapefile.cobject(),  
                                                     i, 0, 1,  
                                                     map_proj, layer_proj,  
                                                     scale, -scale, offx, offy,  
                                                     px, py)  
                     if result < 0:  
                         select_shape = i  
                         break  
             elif shapetype == SHAPETYPE_POINT:  
                 for i in range(layer.NumShapes() - 1, -1, -1):  
                     shape = layer.Shape(i)  
                     x, y = shape.Points()[0]  
                     if inverse:  
                         x, y = inverse(x, y)  
                     if forward:  
                         x, y = forward(x, y)  
                     x = x * scale + offx  
                     y = -y * scale + offy  
                     if hypot(px - x, py - y) < 5:  
                         select_shape = i  
                         break  
   
             if select_shape >= 0:  
                 return layer, select_shape  
         return None, None  
   
     def SelectShapeAt(self, x, y):  
         layer, shape = self.find_shape_at(x, y, selected_layer = 0)  
         # If layer is None, then shape will also be None. We don't want  
         # to deselect the currently selected layer, so we simply select  
         # the already selected layer again.  
         if layer is None:  
             layer = self.interactor.SelectedLayer()  
         self.interactor.SelectLayerAndShape(layer, shape)  
   
     def LabelShapeAt(self, x, y):  
         ox = x; oy = y  
         label_layer = self.map.LabelLayer()  
437          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
438          if layer is None and shape_index is not None:          if layer is None and shape_index is not None:
439              # a label was selected              ViewPort.LabelShapeAt(self, x, y)
             label_layer.RemoveLabel(shape_index)  
440          elif layer is not None:          elif layer is not None:
441              text = labeldialog.run_label_dialog(self, layer.table, shape_index)              text = labeldialog.run_label_dialog(self,
442              if text:                                                  layer.ShapeStore().Table(),
443                  proj = self.map.projection                                                  shape_index)
444                  if proj is not None:              ViewPort.LabelShapeAt(self, x, y, text)
445                      map_proj = proj  
                 else:  
                     map_proj = None  
                 proj = layer.projection  
                 if proj is not None:  
                     layer_proj = proj  
                 else:  
                     layer_proj = None  
446    
                 shapetype = layer.ShapeType()  
                 if shapetype == SHAPETYPE_POLYGON:  
                     x, y = shape_centroid(layer.shapefile.cobject(),  
                                           shape_index,  
                                           map_proj, layer_proj, 1, 1, 0, 0)  
                     if map_proj is not None:  
                         x, y = map_proj.Inverse(x, y)  
                 else:  
                     shape = layer.Shape(shape_index)  
                     if shapetype == SHAPETYPE_POINT:  
                         x, y = shape.Points()[0]  
                     else:  
                         # assume SHAPETYPE_ARC  
                         points = shape.Points()  
                         x, y = points[len(points) / 2]  
                     if layer_proj is not None:  
                         x, y = layer_proj.Inverse(x, y)  
                 if shapetype == SHAPETYPE_POINT:  
                     halign = ALIGN_LEFT  
                     valign = ALIGN_CENTER  
                 elif shapetype == SHAPETYPE_POLYGON:  
                     halign = ALIGN_CENTER  
                     valign = ALIGN_CENTER  
                 elif shapetype == SHAPETYPE_ARC:  
                     halign = ALIGN_LEFT  
                     valign = ALIGN_CENTER  
                 label_layer.AddLabel(x, y, text,  
                                      halign = halign, valign = valign)  
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