/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/legend.py
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revision 1251 by frank, Thu Jun 19 09:25:53 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 684  class ScaleBarBitmap(wxBoxSizer): Line 687  class ScaleBarBitmap(wxBoxSizer):
687    
688          if self.canvas.map is not None \          if self.canvas.map is not None \
689              and self.canvas.map.projection is not None:              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())              self.scalebar.DrawScaleBar(scale, dc, (0,0), dc.GetSizeTuple())
716    
717          self.scalebarBitmap.SetBitmap(bmp)          self.scalebarBitmap.SetBitmap(bmp)
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