/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 1344 by jonathan, Tue Jul 1 16:11:26 2003 UTC revision 1460 by bh, Fri Jul 18 15:23:48 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    
 from math import hypot  
   
19  from wxPython.wx import wxWindow, \  from wxPython.wx import wxWindow, \
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, wxCursor, wxImageFromBitmap, wxPlatform, \       wxPlatform, wxBeginBusyCursor, wxEndBusyCursor, wxFileDialog, wxSAVE, \
23       wxBeginBusyCursor, wxEndBusyCursor       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, Transparent  
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  
   
 #from common import ThubanBeginBusyCursor, ThubanEndBusyCursor  
   
 #  
 #   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"""  
39    
40      def draw(self, dc):  class CanvasPanTool(PanTool):
         sx, sy = self.start  
         cx, cy = self.current  
         dc.DrawRectangle(sx, sy, cx - sx, cy - sy)  
41    
42  class ZoomInTool(RectTool):      """The Canvas Pan Tool"""
   
     """The Zoom-In Tool"""  
   
     def Name(self):  
         return "ZoomInTool"  
   
     def proj_rect(self):  
         """return the rectangle given by start and current in projected  
         coordinates"""  
         sx, sy = self.start  
         cx, cy = self.current  
         left, top = self.view.win_to_proj(sx, sy)  
         right, bottom = self.view.win_to_proj(cx, cy)  
         return (min(left, right), min(top, bottom),  
                 max(left, right), max(top, bottom))  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             if sx == cx or sy == cy:  
                 # Just a mouse click or a degenerate rectangle. Simply  
                 # zoom in by a factor of two  
                 # FIXME: For a click this is the desired behavior but should we  
                 # really do this for degenrate rectagles as well or  
                 # should we ignore them?  
                 self.view.ZoomFactor(2, center = (cx, cy))  
             else:  
                 # A drag. Zoom in to the rectangle  
                 self.view.FitRectToWindow(self.proj_rect())  
   
   
 class ZoomOutTool(RectTool):  
   
     """The Zoom-Out Tool"""  
   
     def Name(self):  
         return "ZoomOutTool"  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             if sx == cx or sy == cy:  
                 # Just a mouse click or a degenerate rectangle. Simply  
                 # zoom out by a factor of two.  
                 # FIXME: For a click this is the desired behavior but should we  
                 # really do this for degenrate rectagles as well or  
                 # should we ignore them?  
                 self.view.ZoomFactor(0.5, center = (cx, cy))  
             else:  
                 # A drag. Zoom out to the rectangle  
                 self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),  
                                          max(sx, cx), max(sy, cy)))  
   
   
 class PanTool(Tool):  
   
     """The Pan Tool"""  
   
     def Name(self):  
         return "PanTool"  
43    
44      def MouseMove(self, event):      def MouseMove(self, event):
45          if self.dragging:          if self.dragging:
46              Tool.MouseMove(self, event)              PanTool.MouseMove(self, event)
47              sx, sy = self.start              sx, sy = self.start
48              x, y = self.current              x, y = self.current
49              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
# Line 205  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 260  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 276  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    
         # the selection  
         self.selection = Selection()  
         self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)  
   
         # keep track of which layers/shapes are selected to make sure we  
         # only redraw when necessary  
         self.last_selected_layer = None  
         self.last_selected_shape = None  
   
112          self.backgroundColor = wx.wxWHITE_BRUSH          self.backgroundColor = wx.wxWHITE_BRUSH
113    
114          # subscribe the WX events we're interested in          # subscribe the WX events we're interested in
# Line 350  class MapCanvas(wxWindow, Publisher): Line 122  class MapCanvas(wxWindow, Publisher):
122    
123      def __del__(self):      def __del__(self):
124          wxWindow.__del__(self)          wxWindow.__del__(self)
125          Publisher.__del__(self)          ViewPort.__del__(self)
   
     def Subscribe(self, channel, *args):  
         """Extend the inherited method to handle delegated messages.  
126    
127          If channel is one of the delegated messages call the appropriate      def PanTool(self):
128          object's Subscribe method. Otherwise just call the inherited          """Start the canvas pan tool"""
129          method.          self.SelectTool(CanvasPanTool(self))
130          """          
131          if channel in self.delegated_messages:      def SetMap(self, map):
132              object = getattr(self, self.delegated_messages[channel])          redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
133              object.Subscribe(channel, *args)                             LAYER_VISIBILITY_CHANGED)
134          else:          if self.Map() is not None:
135              Publisher.Subscribe(self, channel, *args)              for channel in redraw_channels:
136                    self.Map().Unsubscribe(channel, self.full_redraw)
137    
138      def Unsubscribe(self, channel, *args):          ViewPort.SetMap(self, map)
         """Extend the inherited method to handle delegated messages.  
139    
140          If channel is one of the delegated messages call the appropriate          if self.Map() is not None:
141          object's Unsubscribe method. Otherwise just call the inherited              for channel in redraw_channels:
142          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)  
143    
144      def __getattr__(self, attr):          # force a redraw. If map is not empty, it's already been called
145          if attr in self.delegated_methods:          # by FitMapToWindow but if map is empty it hasn't been called
146              return getattr(getattr(self, self.delegated_methods[attr]), attr)          # yet so we have to explicitly call it.
147          raise AttributeError(attr)          self.full_redraw()
148    
149      def OnPaint(self, event):      def OnPaint(self, event):
150          dc = wxPaintDC(self)          dc = wxPaintDC(self)
151    
152          if self.map is not None and self.map.HasLayers():          if self.Map() is not None and self.Map().HasLayers():
153              if self.bitmap in (None, -1):              if self.bitmap in (None, -1):
154                  # set the flag that we should redraw the                  # set the flag that we should redraw the
155                  # bitmap in idle time                  # bitmap in idle time
156                  self.bitmap = -1                  self.bitmap = -1
157                  return              else:
158                    # blit the bitmap to the screen
159              # blit the bitmap to the screen                  dc.BeginDrawing()
160              dc.BeginDrawing()                  dc.DrawBitmap(self.bitmap, 0, 0)
161              dc.DrawBitmap(self.bitmap, 0, 0)                  dc.EndDrawing()
             dc.EndDrawing()  
162          else:          else:
163              # 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
164              # the screen.              # the screen.
# Line 436  class MapCanvas(wxWindow, Publisher): Line 198  class MapCanvas(wxWindow, Publisher):
198    
199              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
200              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
201              renderer.RenderMap(self.map, (0, 0, width, height),              renderer.RenderMap(self.Map(), (0, 0, width, height),
202                                 selected_layer, selected_shapes)                                 selected_layer, selected_shapes)
203    
204              dc.EndDrawing()              dc.EndDrawing()
# Line 451  class MapCanvas(wxWindow, Publisher): Line 213  class MapCanvas(wxWindow, Publisher):
213          self.redraw()          self.redraw()
214    
215      def Export(self):      def Export(self):
         if self.scale == 0:  
             return  
216    
217          if hasattr(self, "export_path"):          if hasattr(self, "export_path"):
218              export_path = self.export_path              export_path = self.export_path
# Line 465  class MapCanvas(wxWindow, Publisher): Line 225  class MapCanvas(wxWindow, Publisher):
225              self.export_path = os.path.dirname(dlg.GetPath())              self.export_path = os.path.dirname(dlg.GetPath())
226              dc = wxMetaFileDC(dlg.GetPath())              dc = wxMetaFileDC(dlg.GetPath())
227            
228              scale, offset, mapregion = OutputTransform(self.scale,              scale, offset, mapregion = output_transform(self.scale,
229                                                         self.offset,                                                          self.offset,
230                                                         self.GetSizeTuple(),                                                          self.GetSizeTuple(),
231                                                         dc.GetSizeTuple())                                                          dc.GetSizeTuple())
232    
233              selected_layer = self.selection.SelectedLayer()              selected_layer = self.selection.SelectedLayer()
234              selected_shapes = self.selection.SelectedShapes()              selected_shapes = self.selection.SelectedShapes()
# Line 478  class MapCanvas(wxWindow, Publisher): Line 238  class MapCanvas(wxWindow, Publisher):
238              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
239              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
240              width, height = self.GetSizeTuple()              width, height = self.GetSizeTuple()
241              renderer.RenderMap(self.map,              renderer.RenderMap(self.Map(),
242                                  (0,0,                                  (0,0,
243                                      (width/self.scale)*scale,                                      (width/self.scale)*scale,
244                                      (height/self.scale)*scale),                                      (height/self.scale)*scale),
# Line 494  class MapCanvas(wxWindow, Publisher): Line 254  class MapCanvas(wxWindow, Publisher):
254          selected_layer = self.selection.SelectedLayer()          selected_layer = self.selection.SelectedLayer()
255          selected_shapes = self.selection.SelectedShapes()          selected_shapes = self.selection.SelectedShapes()
256                    
257          printout = MapPrintout(self, self.map, (0, 0, width, height),          printout = MapPrintout(self, self.Map(), (0, 0, width, height),
258                                 selected_layer, selected_shapes)                                 selected_layer, selected_shapes)
259          printer.Print(self, printout, True)          printer.Print(self, printout, True)
260          printout.Destroy()          printout.Destroy()
261    
     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  
   
262      def redraw(self, *args):      def redraw(self, *args):
263          self.Refresh(False)          self.Refresh(False)
264    
# Line 534  class MapCanvas(wxWindow, Publisher): Line 266  class MapCanvas(wxWindow, Publisher):
266          self.bitmap = None          self.bitmap = None
267          self.redraw()          self.redraw()
268    
269      def map_projection_changed(self, *args):      def map_projection_changed(self, map, old_proj):
270            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()  
   
271          self.full_redraw()          self.full_redraw()
272    
273      def layer_projection_changed(self, *args):      def layer_projection_changed(self, *args):
274            ViewPort.layer_projection_changed(self, args)
275          self.full_redraw()          self.full_redraw()
276    
277      def set_view_transform(self, scale, offset):      def set_view_transform(self, scale, offset):
278          # 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)  
279          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  
280    
281      def ZoomInTool(self):      def GetPortSizeTuple(self):
282          """Start the zoom in tool"""          return self.GetSizeTuple()
         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  
   
     def set_current_position(self, event):  
         """Set the current position from event  
   
         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)  
283    
284      def OnLeftDown(self, event):      def OnLeftDown(self, event):
285          self.set_current_position(event)          self.MouseLeftDown(event)
286          if self.tool is not None:          if self.tool is not None:
287              self.drag_dc = wxClientDC(self)              self.drag_dc = wxClientDC(self)
288              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wxINVERT)
289              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
             self.CaptureMouse()  
             self.tool.MouseDown(event)  
290              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
291                self.CaptureMouse()
292              self.dragging = 1              self.dragging = 1
293    
294      def OnLeftUp(self, event):      def OnLeftUp(self, event):
295          self.set_current_position(event)          self.MouseLeftUp(event)
296          if self.dragging:          if self.dragging:
297              self.ReleaseMouse()              self.ReleaseMouse()
298              try:              try:
299                  self.tool.Hide(self.drag_dc)                  self.tool.Hide(self.drag_dc)
                 self.tool.MouseUp(event)  
300              finally:              finally:
301                  self.drag_dc = None                  self.drag_dc = None
302                  self.dragging = 0                  self.dragging = 0
303    
304      def OnMotion(self, event):      def OnMotion(self, event):
         self.set_current_position(event)  
305          if self.dragging:          if self.dragging:
306              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
307              self.tool.MouseMove(event)  
308            self.MouseMove(event)
309    
310            if self.dragging:
311              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
312    
313      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
# Line 838  class MapCanvas(wxWindow, Publisher): Line 321  class MapCanvas(wxWindow, Publisher):
321          # Even when the window becomes larger some parts of the bitmap          # Even when the window becomes larger some parts of the bitmap
322          # could be reused.          # could be reused.
323          self.full_redraw()          self.full_redraw()
         pass  
324    
325      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
326          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
# Line 848  class MapCanvas(wxWindow, Publisher): Line 330  class MapCanvas(wxWindow, Publisher):
330          # FIXME: We should perhaps try to limit the redraw to the are          # FIXME: We should perhaps try to limit the redraw to the are
331          # actually covered by the shapes before and after the selection          # actually covered by the shapes before and after the selection
332          # change.          # change.
333            ViewPort.shape_selected(self, layer, shape)
334          self.full_redraw()          self.full_redraw()
335    
336      def unprojected_rect_around_point(self, x, y, dist):      def GetTextExtent(self, text):
337          """return a rect dist pixels around (x, y) in unprojected corrdinates          dc = wxClientDC(self)
338            font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
339          The return value is a tuple (minx, miny, maxx, maxy) suitable a          dc.SetFont(font)
340          parameter to a layer's ShapesInRegion method.          return dc.GetTextExtent(text)
         """  
         map_proj = self.map.projection  
         if map_proj is not None:  
             inverse = map_proj.Inverse  
         else:  
             inverse = None  
   
         xs = []  
         ys = []  
         for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):  
             px, py = self.win_to_proj(x + dist * dx, y + dist * dy)  
             if inverse:  
                 px, py = inverse(px, py)  
             xs.append(px)  
             ys.append(py)  
         return (min(xs), min(ys), max(xs), max(ys))  
   
     def find_shape_at(self, px, py, select_labels = 0, searched_layer = None):  
         """Determine the shape at point px, py in window coords  
   
         Return the shape and the corresponding layer as a tuple (layer,  
         shape).  
   
         If the optional parameter select_labels is true (default false)  
         search through the labels. If a label is found return it's index  
         as the shape and None as the layer.  
   
         If the optional parameter searched_layer is given (or not None  
         which it defaults to), only search in that layer.  
         """  
         map_proj = self.map.projection  
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
341    
342          scale = self.scale      def LabelShapeAt(self, x, y, text=None):
   
         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() or not layer.HasShapes():  
                 continue  
   
             filled = layer.GetClassification().GetDefaultFill() \  
                      is not Transparent  
             stroked = layer.GetClassification().GetDefaultLineColor() \  
                       is not 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):  
343          """Add or remove a label at window position x, y.          """Add or remove a label at window position x, y.
344    
345          If there's a label at the given position, remove it. Otherwise          If there's a label at the given position, remove it. Otherwise
346          determine the shape at the position, run the label dialog and          determine the shape at the position, run the label dialog and
347          unless the user cancels the dialog, add a laber.          unless the user cancels the dialog, add a label.
348          """          """
         ox = x; oy = y  
349          label_layer = self.map.LabelLayer()          label_layer = self.map.LabelLayer()
350          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
351          if layer is None and shape_index is not None:          if layer is None and shape_index is not None:
352              # a label was selected              ViewPort.LabelShapeAt(self, x, y)
             label_layer.RemoveLabel(shape_index)  
353          elif layer is not None:          elif layer is not None:
354              text = labeldialog.run_label_dialog(self,              text = labeldialog.run_label_dialog(self,
355                                                  layer.ShapeStore().Table(),                                                  layer.ShapeStore().Table(),
356                                                  shape_index)                                                  shape_index)
357              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:
Removed from v.1344  
changed lines
  Added in v.1460
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