/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 2571 by jonathan, Fri Feb 18 14:54:17 2005 UTC revision 2602 by joey, Mon Apr 25 15:01:48 2005 UTC
# Line 16  __version__ = "$Revision$" Line 16  __version__ = "$Revision$"
16    
17  import cStringIO  import cStringIO
18    
19    import array
20    
21    import traceback
22    
23  from Thuban import _  from Thuban import _
24    
25  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
# Line 113  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 135  class MapRenderer(BaseRenderer): Line 144  class MapRenderer(BaseRenderer):
144    
145          return ret          return ret
146    
147      def draw_raster_data(self, x,y, data, format = 'BMP'):      def draw_raster_data(self, layer, x,y, data, format = 'BMP'):
148    
149          mask = None          mask = None
150            alpha = None
151          width = data[0]          width = data[0]
152          height = data[1]          height = data[1]
153          image_data, mask_data, alpha_data = data[2]          image_data, mask_data, alpha_data = data[2]
# Line 152  class MapRenderer(BaseRenderer): Line 162  class MapRenderer(BaseRenderer):
162                  mask = wxBitmapFromBits(mask_data, width, height, 1)                  mask = wxBitmapFromBits(mask_data, width, height, 1)
163                  mask = wxMask(mask)                  mask = wxMask(mask)
164              elif alpha_data is not None:              elif alpha_data is not None:
165                  image.SetAlphaData(alpha_data)                  # alpha_data is already in the right format
166                    alpha = alpha_data
167    
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])
# Line 163  class MapRenderer(BaseRenderer): Line 175  class MapRenderer(BaseRenderer):
175              elif alpha_data is not None:              elif alpha_data is not None:
176                  stream = cStringIO.StringIO(alpha_data)                  stream = cStringIO.StringIO(alpha_data)
177                  alpha = wxImageFromStream(stream, raster_format_map[format])                  alpha = wxImageFromStream(stream, raster_format_map[format])
178                  image.SetAlpha(alpha.GetData()[:])                  alpha = alpha.GetData()[:] # XXX: do we need to copy this?
179    
180            #
181            # if we are using the alpha_data then scale down the alpha values
182            # by the layer's opacity using a string translation table
183            #
184            if alpha is not None:
185                lo = layer.Opacity()
186                if lo == 0:
187                    return
188                elif lo == 1:
189                    a = alpha
190                else:
191                    tr = [int(i*lo) for i in range(256)]
192                    table = array.array('B', tr).tostring()
193                    a = alpha.translate(table)
194    
195                image.SetAlphaData(a)
196    
197          bitmap = wxBitmapFromImage(image)          bitmap = wxBitmapFromImage(image)
198          bitmap.SetMask(mask)  
199            if mask is not None:
200                bitmap.SetMask(mask)
201    
202          self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)          self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
203    
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