/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 2552 by jonathan, Fri Jan 28 15:54:00 2005 UTC revision 2618 by jonathan, Fri May 6 14:18:31 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 43  from math import floor Line 47  from math import floor
47    
48  from types import StringType  from types import StringType
49    
50    from Thuban.version import versions
51    
52    if Thuban.Model.resource.has_gdal_support():
53        from gdalwarp import ProjectRasterFile
54    
55    
56  # Map the strings used for the format parameter of the draw_raster_data  # Map the strings used for the format parameter of the draw_raster_data
57  # method to the appropriate wxWindows constants  # method to the appropriate wxWindows constants
# Line 92  class MapRenderer(BaseRenderer): Line 101  class MapRenderer(BaseRenderer):
101          if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE          if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
102              and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):              and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
103              offx, offy = self.offset              offx, offy = self.offset
104                x = lambda a, b, c, d: None
105                #return (True, x, None)
106              return (True, draw_polygon_shape,              return (True, draw_polygon_shape,
107                      draw_polygon_init(layer.ShapeStore().Shapefile(),                      draw_polygon_init(layer.ShapeStore().Shapefile(),
108                                        self.dc, self.map.projection,                                        self.dc, self.map.projection,
# Line 104  class MapRenderer(BaseRenderer): Line 115  class MapRenderer(BaseRenderer):
115          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
116                        wxNORMAL)                        wxNORMAL)
117    
118      def draw_raster_data(self, x,y, data, format = 'BMP'):      def projected_raster_layer(self, layer, srcProj, dstProj, extents,
119                                   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
127    
128            if Thuban.Model.resource.has_gdal_support():
129    
130                if versions['wxPython-tuple'] < (2,5,3):
131                    options = options | 4  # INVERT_MASK_BITS
132                    options = options & ~2 # ALPHA_MASK not supported
133    
134                try:
135                    ret = ProjectRasterFile(layer.GetImageFilename(),
136                                            srcProj, dstProj,
137                                            extents, resolution, dimensions,
138                                            options)
139                except (MemoryError, IOError, AttributeError, ValueError):
140                    # Why does this catch AttributeError and ValueError?
141                    # FIXME: The exception should be communicated to the user
142                    # better.
143                    traceback.print_exc()
144    
145            return ret
146    
147        def draw_raster_data(self, x,y, data, format = 'BMP', opacity=1.0):
148    
149          mask = None          mask = None
150            alpha = None
151            width = data[0]
152            height = data[1]
153            image_data, mask_data, alpha_data = data[2]
154    
155            if versions['wxPython-tuple'] < (2,5,3):
156                alpha_data = None
157    
158          if format == 'RAW':          if format == 'RAW':
159              image = wxEmptyImage(data[0], data[1])              image = wxEmptyImage(width, height)
160              image.SetData(data[2][0])              image.SetData(image_data)
161              if data[2][1] is not None:              if mask_data is not None:
162                  mask = wxBitmapFromBits(data[2][1], data[0], data[1], 1)                  mask = wxBitmapFromBits(mask_data, width, height, 1)
163                  mask = wxMask(mask)                  mask = wxMask(mask)
164                elif alpha_data is not None:
165                    # alpha_data is already in the right format
166                    alpha = alpha_data
167    
168          else:          else:
169              stream = cStringIO.StringIO(data[2][0])              stream = cStringIO.StringIO(image_data)
170              image = wxImageFromStream(stream, raster_format_map[format])              image = wxImageFromStream(stream, raster_format_map[format])
171              if data[2][1] is not None:  
172                  stream = cStringIO.StringIO(data[2][1])              if mask_data is not None:
173                    stream = cStringIO.StringIO(mask_data)
174                  mask = wxImageFromStream(stream, raster_format_map[format])                  mask = wxImageFromStream(stream, raster_format_map[format])
175                  mask = wxMask(wxBitmapFromImage(mask, 1))                  mask = wxMask(wxBitmapFromImage(mask, 1))
176                elif alpha_data is not None:
177                    stream = cStringIO.StringIO(alpha_data)
178                    alpha = wxImageFromStream(stream, raster_format_map[format])
179                    alpha = alpha.GetData() #[:] # XXX: do we need to copy this?
180                elif image.HasAlpha():
181                    alpha = image.GetAlphaData()
182    
183            #
184            # scale down the alpha values the opacity level using a string
185            # translation table for efficiency.
186            #
187            if alpha is not None:
188                if opacity == 0:
189                    return
190                elif opacity == 1:
191                    a = alpha
192                else:
193                    tr = [int(i*opacity) for i in range(256)]
194                    table = array.array('B', tr).tostring()
195                    a = alpha.translate(table)
196    
197                image.SetAlphaData(a)
198    
199          bitmap = wxBitmapFromImage(image)          bitmap = wxBitmapFromImage(image)
200          bitmap.SetMask(mask)  
201            if mask is not None:
202                bitmap.SetMask(mask)
203    
204          self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)          self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
205    
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