/[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 2571 by jonathan, Fri Feb 18 14:54:17 2005 UTC
# Line 30  from Thuban.Model.label import ALIGN_CEN Line 30  from Thuban.Model.label import ALIGN_CEN
30    
31  import Thuban.Model.resource  import Thuban.Model.resource
32    
 if Thuban.Model.resource.has_gdal_support():  
     from gdalwarp import ProjectRasterFile  
33    
34    
35  #  #
# Line 76  def init_renderer_extensions(): Line 74  def init_renderer_extensions():
74      """      """
75      del _renderer_extensions[:]      del _renderer_extensions[:]
76    
77    def proj_params_to_str(proj):
78        "Build a string suitable for GDAL describing the given projection"
79        str = ""
80        if proj is not None:
81            for p in proj.GetAllParameters():
82                str += "+" + p + " "
83        return str
84    
85  #  #
86  #       Base Renderer  #       Base Renderer
# Line 177  class BaseRenderer: Line 182  class BaseRenderer:
182          that methods especially in derived classes have access to the          that methods especially in derived classes have access to the
183          map if necessary.          map if necessary.
184          """          """
         # 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  
185    
186          for layer in self.map.Layers():          for layer in self.map.Layers():
187              # if honor_visibility is true, only draw visible layers,              # if honor_visibility is true, only draw visible layers,
188              # otherwise draw all layers              # otherwise draw all layers
189              if not self.honor_visibility or layer.Visible():              if not self.honor_visibility or layer.Visible():
190                  if isinstance(layer, Layer):                  if isinstance(layer, Layer):
191                      if seenRaster:                      for i in self.draw_shape_layer_incrementally(layer):
192                          for i in self.draw_shape_layer_incrementally(layer):                          yield True
193                              yield True                  elif isinstance(layer, RasterLayer):
                 elif isinstance(layer, RasterLayer) \  
                     and Thuban.Model.resource.has_gdal_support():  
194                      self.draw_raster_layer(layer)                      self.draw_raster_layer(layer)
                     seenRaster = True  
195                      yield True                      yield True
196                  else:                  else:
197                      # look it up in the renderer extensions                      # look it up in the renderer extensions
# Line 370  class BaseRenderer: Line 356  class BaseRenderer:
356          scale = self.scale          scale = self.scale
357          offx, offy = self.offset          offx, offy = self.offset
358          make_point = self.make_point          make_point = self.make_point
359    
360          for part in points:          for part in points:
361              result.append([])              result.append([])
362              for x, y in part:              for x, y in part:
# Line 453  class BaseRenderer: Line 440  class BaseRenderer:
440      def draw_raster_layer(self, layer):      def draw_raster_layer(self, layer):
441          """Draw the raster layer          """Draw the raster layer
442    
443          This implementation does the projection and scaling of the data          This implementation uses self.projected_raster_layer() to project
444          as required by the layer's and map's projections and the scale          and scale the data as required by the layer's and map's projections
445          and offset of the renderer and then hands the transformed data          and the scale and offset of the renderer and then hands the transformed
446          to self.draw_raster_data() which has to be implemented in          data to self.draw_raster_data() which has to be implemented in
447          derived classes.          derived classes.
448          """          """
449          offx, offy = self.offset          offx, offy = self.offset
450          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
451    
452          in_proj = ""          in_proj  = proj_params_to_str(layer.GetProjection())
453          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 + " "  
454    
455          out_proj = ""          # True  -- warp the image to the size of the whole screen
456          proj = self.map.GetProjection()          # False -- only use the bound box of the layer (currently inaccurate)
457          if proj is not None:          if True:
458              for p in proj.GetAllParameters():          #if False:
459                  out_proj += "+" + p + " "              pmin = [0,height]
460                pmax = [width, 0]
461            else:
462                bb = layer.LatLongBoundingBox()
463                bb = [[[bb[0], bb[1]], [bb[2], bb[3]],],]
464                pmin, pmax = self.projected_points(layer, bb)[0]
465    
466          xmin = (0 - offx) / self.scale          #print bb
467          ymin = (offy - height) / self.scale          #print pmin, pmax
         xmax = (width - offx) / self.scale  
         ymax = (offy - 0) / self.scale  
468    
469          try:          fmin = [max(0, min(pmin[0], pmax[0])) - offx,
470              data = ProjectRasterFile(layer.GetImageFilename(),                  offy - min(height, max(pmin[1], pmax[1]))]
471                                       in_proj, out_proj,  
472                                       (xmin, ymin, xmax, ymax), "",          fmax = [min(width, max(pmin[0], pmax[0])) - offx,
473                                       (width, height))                  offy - max(0, min(pmin[1], pmax[1]))]
474          except (IOError, AttributeError, ValueError):  
475              # Why does this catch AttributeError and ValueError?          xmin = fmin[0]/self.scale
476              # FIXME: The exception should be communicated to the user          ymin = fmin[1]/self.scale
477              # better.          xmax = fmax[0]/self.scale
478              traceback.print_exc()          ymax = fmax[1]/self.scale
479          else:  
480              self.draw_raster_data(data, "BMP")          width  = int(min(width,  round(fmax[0] - fmin[0] + 1)))
481            height = int(min(height, round(fmax[1] - fmin[1] + 1)))
482    
483      def draw_raster_data(self, data, format="BMP"):          options = 0
484          """Draw the raster image in data onto the DC          options = options | layer.MaskType()
485    
486            img_data = self.projected_raster_layer(layer, in_proj, out_proj,
487                        (xmin,ymin,xmax,ymax), [0,0], (width, height), options)
488    
489            if img_data is not None:
490                data = (width, height, img_data)
491                self.draw_raster_data(fmin[0]+offx, offy-fmax[1], data, "RAW")
492                data = None
493    
494        def projected_raster_layer(self, layer, srcProj, dstProj, extents,
495                                   resolution, dimensions, options):
496            """Return the projected raster image associated with the layer.
497    
498            The returned value will be a tuple of the form
499    
500                (image_data, mask_data, alpha_data)
501    
502            suitable for the data parameter to draw_raster_data.
503    
504            The return value may be None if raster projections are not supported.
505    
506            srcProj     --  a string describing the source projection
507            dstProj     --  a string describing the destination projection
508            extents     --  a tuple of the region to project in map coordinates
509            resolution  --  (currently not used, defaults to [0,0])
510            dimensions  --  a tuple (width, height) for the output image
511            options     --  bit-wise options to pass to the renderer
512    
513            the currently supported values for options are
514    
515                OPTS_MASK        = 1  -- generate a mask
516                OPTS_ALPHA       = 2  -- generate an alpha channel
517                OPTS_INVERT_MASK = 4  -- invert the values in the mask
518                                         (if generated)
519    
520            This method has to be implemented by derived classes.
521            """
522    
523            raise NotImplementedError
524    
525          The raster image data is a string holding the data in the format      def draw_raster_data(self, x, y, data, format="BMP"):
526          indicated by the format parameter. The image is assumed to be          """Draw the raster image in data onto the DC with the top
527          exactly the size of the dc and to cover it completely.          left corner at (x,y)
528    
529            The raster image data is a tuple of the form
530                (width, height, (image_data, mask_data, alpha_data))
531            
532            holding the image width, height, image data, mask data, and alpha data.
533            mask_data may be None if a mask should not be used. alpha_data may
534            also be None. If both are not None mask overrides alpha. If
535            format is 'RAW' the data will be RGB values and the mask
536            will be in XMB format. Otherwise, both kinds
537            of data are assumed to be in the format specified in format.
538    
539          The format parameter is a string with the name of the format.          The format parameter is a string with the name of the format.
540          The following format names should be used:          The following format names should be used:
541    
542            'BMP' -- Windows Bitmap            'RAW'  -- an array of RGB values (len=3*width*height)
543            'JPEG' -- Jpeg            'BMP'  -- Windows Bitmap
544              'JPEG' -- JPEG Image
545    
546          The default format is 'bmp'.          The default format is 'BMP'.
547    
548          This method has to be implemented by derived classes. The          This method has to be implemented by derived classes. The
549          implementation in the derived class should try to support at          implementation in the derived class should try to support at
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