/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/legend.py
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revision 1129 by bh, Wed Jun 4 18:36:52 2003 UTC revision 1252 by jonathan, Fri Jun 20 09:28:08 2003 UTC
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
11    from  math import fabs, cos, pi
12    
13  from Thuban import _  from Thuban import _
14    
15  import resource  import resource
# Line 17  from wxPython.wx import * Line 19  from wxPython.wx import *
19  from Thuban.Model.layer import BaseLayer  from Thuban.Model.layer import BaseLayer
20  from Thuban.Model.map import Map  from Thuban.Model.map import Map
21  from Thuban.Model.classification import ClassGroup  from Thuban.Model.classification import ClassGroup
22    from Thuban.Model.proj import PROJ_UNITS_DEGREES
23    
24  from Thuban.Model.messages import \  from Thuban.Model.messages import \
25      MAP_STACKING_CHANGED, MAP_LAYERS_ADDED, MAP_LAYERS_REMOVED, LAYER_CHANGED,\      MAP_STACKING_CHANGED, MAP_LAYERS_ADDED, MAP_LAYERS_REMOVED, LAYER_CHANGED,\
# Line 220  class LegendTree(wxTreeCtrl): Line 223  class LegendTree(wxTreeCtrl):
223    
224          self.previewer = ClassDataPreviewer()          self.previewer = ClassDataPreviewer()
225    
226            self.preventExpandCollapse = False
227            self.raiseProperties = False
228    
229          EVT_TREE_ITEM_ACTIVATED(self, ID_LEGEND_TREE, self._OnItemActivated)          EVT_TREE_ITEM_ACTIVATED(self, ID_LEGEND_TREE, self._OnItemActivated)
230          EVT_TREE_SEL_CHANGED(self, ID_LEGEND_TREE, self._OnSelChanged)          EVT_TREE_SEL_CHANGED(self, ID_LEGEND_TREE, self._OnSelChanged)
231            EVT_TREE_ITEM_EXPANDING(self, ID_LEGEND_TREE, self.OnItemExpandCollapse)
232            EVT_TREE_ITEM_COLLAPSING(self, ID_LEGEND_TREE, self.OnItemExpandCollapse)
233    
234          EVT_CLOSE(self, self._OnClose)          EVT_CLOSE(self, self._OnClose)
235    
# Line 381  class LegendTree(wxTreeCtrl): Line 389  class LegendTree(wxTreeCtrl):
389              self.changing_selection = 0              self.changing_selection = 0
390    
391    
392        def OnItemExpandCollapse(self, event):
393            if self.preventExpandCollapse:
394                event.Veto()
395                self.preventExpandCollapse = False
396    
397      def _OnItemActivated(self, event):      def _OnItemActivated(self, event):
398          self.parent.DoOnProperties()          # The following looks strange but is need under Windows to
399            # raise the Properties on double-click: The tree control
400            # always gets an Expanded / Collapsed event after the ItemActivated
401            # on double click, which raises the main window again. We add a second
402            # ItemActivated event to the queue, which simply raises the already
403            # displayed window.
404            if self.raiseProperties:
405                self.parent.DoOnProperties()
406                self.raiseProperties = False
407            else:
408                self.raiseProperties = True
409                self.preventExpandCollapse = True
410                self.parent.DoOnProperties()
411                self.AddPendingEvent(event)
412    
413      def _OnMsgLayerChanged(self, layer):      def _OnMsgLayerChanged(self, layer):
414          assert isinstance(layer, BaseLayer)          assert isinstance(layer, BaseLayer)
# Line 659  class ScaleBarBitmap(wxBoxSizer): Line 685  class ScaleBarBitmap(wxBoxSizer):
685          dc.SelectObject(bmp)          dc.SelectObject(bmp)
686          dc.Clear()          dc.Clear()
687    
688          self.scalebar.DrawScaleBar(scale, dc, (0,0), dc.GetSizeTuple())          if self.canvas.map is not None \
689                and self.canvas.map.projection is not None:
690    
691                # if we are using a projection with geographics coordinates
692                # we need to change the scale value based on where we are
693                # on the globe.
694                if self.canvas.map.projection.GetProjectedUnits() \
695                    == PROJ_UNITS_DEGREES:
696    
697                    width, height = self.canvas.GetSizeTuple()
698                    long, lat = self.canvas.win_to_proj(width/2, height/2)
699    
700                    # slightly inaccurate, but if we are looking at
701                    # the north/south pole we could end up dividing by zero
702                    #
703                    # it shouldn't matter for our purposes that we ignore
704                    # the original sign of lat.
705                    if fabs(lat) > 89.9: lat = 89.9
706    
707                    #
708                    # one degree is about 111,133m at the equator
709                    # we need to adjust that for latitude as
710                    # we move north/south. use the center of the map
711                    # as the point to scale the length to.
712                    #
713                    scale = scale / (111133.0 * fabs(cos(lat * pi/180)))
714    
715                self.scalebar.DrawScaleBar(scale, dc, (0,0), dc.GetSizeTuple())
716    
717          self.scalebarBitmap.SetBitmap(bmp)          self.scalebarBitmap.SetBitmap(bmp)
718    
Legend:
Removed from v.1129  
changed lines
  Added in v.1252
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