/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 2601 by joey, Sat Apr 23 16:40:33 2005 UTC revision 2639 by bh, Thu Jun 30 16:15:03 2005 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001-2004 by Intevation GmbH  # Copyright (c) 2001-2005 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]> (2001-2003)  # Bernhard Herzog <[email protected]> (2001-2003)
4  # Jonathan Coles <[email protected]> (2003)  # Jonathan Coles <[email protected]> (2003)
5  # Frank Koormann <[email protected]> (2003)  # Frank Koormann <[email protected]> (2003)
6  # Jan-Oliver Wagner <[email protected]> (2003, 2004)  # Jan-Oliver Wagner <[email protected]> (2003-2005)
7  #  #
8  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
9  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 117  class MapRenderer(BaseRenderer): Line 117  class MapRenderer(BaseRenderer):
117    
118      def projected_raster_layer(self, layer, srcProj, dstProj, extents,      def projected_raster_layer(self, layer, srcProj, dstProj, extents,
119                                 resolution, dimensions, options):                                 resolution, dimensions, options):
120            """Returns a raster layer image in projected space
121    
122            Based on a given filename.  This method must be implemented in
123            classes derived from BaseRenderer.
124            """
125    
126          ret = None          ret = None
127    
# Line 139  class MapRenderer(BaseRenderer): Line 144  class MapRenderer(BaseRenderer):
144    
145          return ret          return ret
146    
147      def draw_raster_data(self, layer, x,y, data, format = 'BMP'):      def draw_raster_data(self, x,y, data, format = 'BMP', opacity=1.0):
148    
149          mask = None          mask = None
150          alpha = None          alpha = None
# Line 163  class MapRenderer(BaseRenderer): Line 168  class MapRenderer(BaseRenderer):
168          else:          else:
169              stream = cStringIO.StringIO(image_data)              stream = cStringIO.StringIO(image_data)
170              image = wxImageFromStream(stream, raster_format_map[format])              image = wxImageFromStream(stream, raster_format_map[format])
171    
172              if mask_data is not None:              if mask_data is not None:
173                  stream = cStringIO.StringIO(mask_data)                  stream = cStringIO.StringIO(mask_data)
174                  mask = wxImageFromStream(stream, raster_format_map[format])                  mask = wxImageFromStream(stream, raster_format_map[format])
# Line 170  class MapRenderer(BaseRenderer): Line 176  class MapRenderer(BaseRenderer):
176              elif alpha_data is not None:              elif alpha_data is not None:
177                  stream = cStringIO.StringIO(alpha_data)                  stream = cStringIO.StringIO(alpha_data)
178                  alpha = wxImageFromStream(stream, raster_format_map[format])                  alpha = wxImageFromStream(stream, raster_format_map[format])
179                  alpha = alpha.GetData()[:] # XXX: do we need to copy this?                  alpha = alpha.GetData() #[:] # XXX: do we need to copy this?
180                elif image.HasAlpha():
181                    alpha = image.GetAlphaData()
182    
183          #          #
184          # if we are using the alpha_data then scale down the alpha values          # scale down the alpha values the opacity level using a string
185          # by the layer's opacity using a string translation table          # translation table for efficiency.
186          #          #
187          if alpha is not None:          if alpha is not None:
188              lo = layer.Opacity()              if opacity == 0:
             if lo == 0:  
189                  return                  return
190              elif lo == 1:              elif opacity == 1:
191                  a = alpha                  a = alpha
192              else:              else:
193                  tr = [int(i*lo) for i in range(256)]                  tr = [int(i*opacity) for i in range(256)]
194                  table = array.array('B', tr).tostring()                  table = array.array('B', tr).tostring()
195                  a = alpha.translate(table)                  a = alpha.translate(table)
196    
# Line 257  class ScreenRenderer(MapRenderer): Line 264  class ScreenRenderer(MapRenderer):
264    
265              # Get the size of the specific property for this              # Get the size of the specific property for this
266              # point              # point
267              if shapetype == SHAPETYPE_POINT and field is not None:              if shapetype == SHAPETYPE_POINT:
268                  value = table.ReadValue(shape.ShapeID(), field)                  if field is not None:
269                  group = lc.FindGroup(value)                      value = table.ReadValue(shape.ShapeID(), field)
270                  size = group.GetProperties().GetSize()                      group = lc.FindGroup(value)
271                        size = group.GetProperties().GetSize()
272                    else:
273                        size = lc.GetDefaultSize()
274                  args = (pen, brush, size)                  args = (pen, brush, size)
275    
276              if useraw:              if useraw:
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