/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/baserenderer.py
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revision 2413 by bernhard, Mon Nov 22 11:16:35 2004 UTC revision 2552 by jonathan, Fri Jan 28 15:54:00 2005 UTC
# Line 76  def init_renderer_extensions(): Line 76  def init_renderer_extensions():
76      """      """
77      del _renderer_extensions[:]      del _renderer_extensions[:]
78    
79    def proj_params_to_str(proj):
80        "Build a string suitable for GDAL describing the given projection"
81        str = ""
82        if proj is not None:
83            for p in proj.GetAllParameters():
84                str += "+" + p + " "
85        return str
86    
87  #  #
88  #       Base Renderer  #       Base Renderer
# Line 177  class BaseRenderer: Line 184  class BaseRenderer:
184          that methods especially in derived classes have access to the          that methods especially in derived classes have access to the
185          map if necessary.          map if necessary.
186          """          """
         # Whether the raster layer has already been drawn. See below for  
         # the optimization this is used for  
         seenRaster = True  
   
         #  
         # This is only a good optimization if there is only one  
         # raster layer and the image covers the entire window (as  
         # it currently does). We note if there is a raster layer  
         # and only begin drawing layers once we have drawn it.  
         # That way we avoid drawing layers that won't be seen.  
         #  
         if Thuban.Model.resource.has_gdal_support():  
             for layer in self.map.Layers():  
                 if isinstance(layer, RasterLayer) and layer.Visible():  
                     seenRaster = False  
                     break  
187    
188          for layer in self.map.Layers():          for layer in self.map.Layers():
189              # if honor_visibility is true, only draw visible layers,              # if honor_visibility is true, only draw visible layers,
190              # otherwise draw all layers              # otherwise draw all layers
191              if not self.honor_visibility or layer.Visible():              if not self.honor_visibility or layer.Visible():
192                  if isinstance(layer, Layer):                  if isinstance(layer, Layer):
193                      if seenRaster:                      for i in self.draw_shape_layer_incrementally(layer):
194                          for i in self.draw_shape_layer_incrementally(layer):                          yield True
                             yield True  
195                  elif isinstance(layer, RasterLayer) \                  elif isinstance(layer, RasterLayer) \
196                      and Thuban.Model.resource.has_gdal_support():                      and Thuban.Model.resource.has_gdal_support():
197                      self.draw_raster_layer(layer)                      self.draw_raster_layer(layer)
                     seenRaster = True  
198                      yield True                      yield True
199                  else:                  else:
200                      # look it up in the renderer extensions                      # look it up in the renderer extensions
# Line 370  class BaseRenderer: Line 359  class BaseRenderer:
359          scale = self.scale          scale = self.scale
360          offx, offy = self.offset          offx, offy = self.offset
361          make_point = self.make_point          make_point = self.make_point
362    
363          for part in points:          for part in points:
364              result.append([])              result.append([])
365              for x, y in part:              for x, y in part:
# Line 462  class BaseRenderer: Line 452  class BaseRenderer:
452          offx, offy = self.offset          offx, offy = self.offset
453          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
454    
455          in_proj = ""          in_proj  = proj_params_to_str(layer.GetProjection())
456          proj = layer.GetProjection()          out_proj = proj_params_to_str(self.map.GetProjection())
         if proj is not None:  
             for p in proj.GetAllParameters():  
                 in_proj += "+" + p + " "  
457    
458          out_proj = ""          # True  -- warp the image to the size of the whole screen
459          proj = self.map.GetProjection()          # False -- only use the bound box of the layer (currently inaccurate)
460          if proj is not None:          if True:
461              for p in proj.GetAllParameters():          #if False:
462                  out_proj += "+" + p + " "              pmin = [0,height]
463                pmax = [width, 0]
464            else:
465                bb = layer.LatLongBoundingBox()
466                bb = [[[bb[0], bb[1]], [bb[2], bb[3]],],]
467                pmin, pmax = self.projected_points(layer, bb)[0]
468    
469            #print bb
470            #print pmin, pmax
471    
472            fmin = [max(0, min(pmin[0], pmax[0])) - offx,
473                    offy - min(height, max(pmin[1], pmax[1]))]
474    
475            fmax = [min(width, max(pmin[0], pmax[0])) - offx,
476                    offy - max(0, min(pmin[1], pmax[1]))]
477    
478            xmin = fmin[0]/self.scale
479            ymin = fmin[1]/self.scale
480            xmax = fmax[0]/self.scale
481            ymax = fmax[1]/self.scale
482    
483          xmin = (0 - offx) / self.scale          width  = int(min(width,  round(fmax[0] - fmin[0] + 1)))
484          ymin = (offy - height) / self.scale          height = int(min(height, round(fmax[1] - fmin[1] + 1)))
         xmax = (width - offx) / self.scale  
         ymax = (offy - 0) / self.scale  
485    
486          try:          try:
487              data = ProjectRasterFile(layer.GetImageFilename(),              options = 0
488                                       in_proj, out_proj,              if layer.UseMask(): options = options | 1
489                                       (xmin, ymin, xmax, ymax), "",  
490                                       (width, height))              project_params = (layer.GetImageFilename(), in_proj, out_proj,
491          except (IOError, AttributeError, ValueError):                                (xmin, ymin, xmax, ymax), "", (width, height),
492                                  options)
493    
494                data = (width, height, apply(ProjectRasterFile, project_params))
495    
496            except (MemoryError, IOError, AttributeError, ValueError):
497              # Why does this catch AttributeError and ValueError?              # Why does this catch AttributeError and ValueError?
498              # FIXME: The exception should be communicated to the user              # FIXME: The exception should be communicated to the user
499              # better.              # better.
500              traceback.print_exc()              traceback.print_exc()
501          else:          else:
502              self.draw_raster_data(data, "BMP")              self.draw_raster_data(fmin[0]+offx, offy-fmax[1], data, "RAW")
503                data = None
     def draw_raster_data(self, data, format="BMP"):  
         """Draw the raster image in data onto the DC  
504    
505          The raster image data is a string holding the data in the format      def draw_raster_data(self, x, y, data, format="BMP"):
506          indicated by the format parameter. The image is assumed to be          """Draw the raster image in data onto the DC with the top
507          exactly the size of the dc and to cover it completely.          left corner at (x,y)
508    
509            The raster image data is a tuple of the form
510                (width, height, (image_data, mask_data))
511            
512            holding the image width, height, image data, and mask data.
513            mask_data may be None if a mask should not be used. If
514            format is 'RAW' the data will be RGB values and the mask
515            will be in XMB format. Otherwise, both kinds
516            of data are assumed to be in the format specified in format.
517    
518          The format parameter is a string with the name of the format.          The format parameter is a string with the name of the format.
519          The following format names should be used:          The following format names should be used:
520    
521            'BMP' -- Windows Bitmap            'RAW'  -- an array of RGB values (len=3*width*height)
522            'JPEG' -- Jpeg            'BMP'  -- Windows Bitmap
523              'JPEG' -- JPEG Image
524    
525          The default format is 'bmp'.          The default format is 'BMP'.
526    
527          This method has to be implemented by derived classes. The          This method has to be implemented by derived classes. The
528          implementation in the derived class should try to support at          implementation in the derived class should try to support at
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