/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/baserenderer.py
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revision 1918 by bh, Mon Nov 3 17:33:19 2003 UTC revision 2700 by dpinte, Mon Sep 18 14:27:02 2006 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003, 2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
# Line 20  __version__ = "$Revision$" Line 20  __version__ = "$Revision$"
20  # $Source$  # $Source$
21  # $Id$  # $Id$
22    
23    import sys
24  import traceback  import traceback
25    
26  from Thuban.Model.layer import Layer, RasterLayer  from Thuban.Model.layer import Layer, RasterLayer
# Line 29  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    #
36    #       Renderer Extensions
37    #
38    # The renderer extensions provide a way to render layer types defined in
39    # Thuban extensions. The renderer extensions are stored as a list with
40    # (layer_class, draw_function) pairs. If the renderer has to draw a
41    # non-builtin layer type, i.e. a layer that is not a subclass of Layer
42    # or RasterLayer, it iterates through that list, tests whether the layer
43    # to be drawn is an instance of layer_class and if so calls
44    # draw_function with the renderer and the layer as arguments. Since
45    # drawing is done incrementally, the draw_function should return an
46    # iterable. The easiest way is to simply implement the draw_function as
47    # a generator and to yield in suitable places, or to return the empty
48    # tuple.
49    #
50    # New renderer extensions should be added with add_renderer_extension().
51    # If necessary the extensions list can be reset with
52    # init_renderer_extensions().
53    
54    _renderer_extensions = []
55    
56    def add_renderer_extension(layer_class, function):
57        """Add a renderer extension for the layer class layer_class
58    
59        When an instance of layer_class is to be drawn by the renderer the
60        renderer will call function with the renderer and the layer_class
61        instance as arguments. Since drawing is done incrementally, the
62        function should return an iterable. The easiest way is to simply
63        implement the draw_function as a generator and to yield True in
64        suitable places, or to return the empty tuple if it's not possible
65        to do the rendering incrementally.
66        """
67        _renderer_extensions.append((layer_class, function))
68    
69    def init_renderer_extensions():
70        """(Re)initialize the list of renderer extensions
71    
72        Calling this function outside of the test suite is probably not
73        useful.
74        """
75        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
87    #
88    
89  class BaseRenderer:  class BaseRenderer:
90    
91      """Basic Renderer Infrastructure for Thuban Maps      """Basic Renderer Infrastructure for Thuban Maps
# Line 129  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) and seenRaster:                  if isinstance(layer, Layer):
191                      for i in self.draw_shape_layer_incrementally(layer):                      for i in self.draw_shape_layer_incrementally(layer):
192                          yield True                          yield True
193                  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:
197                        # look it up in the renderer extensions
198                        for cls, func in _renderer_extensions:
199                            if isinstance(layer, cls):
200                                for i in func(self, layer):
201                                    yield True
202                                break
203                        else:
204                            # No renderer found. Print a message about it
205                            print >>sys.stderr, ("Drawing layer %r not supported"
206                                                 % layer)
207                yield True
208    
209          self.draw_label_layer(self.map.LabelLayer())          self.draw_label_layer(self.map.LabelLayer())
210          yield False          yield False
# Line 228  class BaseRenderer: Line 275  class BaseRenderer:
275                  data = shape.RawData()                  data = shape.RawData()
276              else:              else:
277                  data = shape.Points()                  data = shape.Points()
278              draw_func(draw_func_param, data, pen, brush)              if draw_func == self.draw_point_shape:
279                     draw_func(draw_func_param, data, pen, brush,
280                               size = group.GetProperties().GetSize())
281                else:
282                     draw_func(draw_func_param, data, pen, brush)
283              if count % 500 == 0:              if count % 500 == 0:
284                  yield True                  yield True
285    
# Line 305  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 323  class BaseRenderer: Line 375  class BaseRenderer:
375          value of the shape's Points() method. The coordinates in the          value of the shape's Points() method. The coordinates in the
376          DC's coordinate system are determined with          DC's coordinate system are determined with
377          self.projected_points.          self.projected_points.
378    
379            For a description of the algorithm look in wxproj.cpp.
380          """          """
381          points = self.projected_points(layer, points)          points = self.projected_points(layer, points)
382    
# Line 331  class BaseRenderer: Line 385  class BaseRenderer:
385              for part in points:              for part in points:
386                  polygon.extend(part)                  polygon.extend(part)
387    
388                # missing back vertices for correct filling.
389              insert_index = len(polygon)              insert_index = len(polygon)
390              for part in points[:-1]:              for part in points[:-1]:
391                  polygon.insert(insert_index, part[0])                  polygon.insert(insert_index, part[0])
# Line 360  class BaseRenderer: Line 415  class BaseRenderer:
415          for part in points:          for part in points:
416              self.dc.DrawLines(part)              self.dc.DrawLines(part)
417    
418      def draw_point_shape(self, layer, points, pen, brush):      def draw_point_shape(self, layer, points, pen, brush, size = 5):
419          """Draw a point shape from layer with the given brush and pen          """Draw a point shape from layer with the given brush and pen
420    
421          The shape is given by points argument which is a the return          The shape is given by points argument which is a the return
# Line 374  class BaseRenderer: Line 429  class BaseRenderer:
429          if not points:          if not points:
430              return              return
431    
432          radius = self.resolution * 5          radius = int(round(self.resolution * size))
433          self.dc.SetBrush(brush)          self.dc.SetBrush(brush)
434          self.dc.SetPen(pen)          self.dc.SetPen(pen)
435          for part in points:          for part in points:
# Line 385  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)          width  = int(min(width,  round(fmax[0] - fmin[0] + 1)))
481            height = int(min(height, round(fmax[1] - fmin[1] + 1)))
482    
483            options = 0
484            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],
492                                      data, format="RAW", opacity=layer.Opacity())
493                data = None
494    
495      def draw_raster_data(self, data):      def projected_raster_layer(self, layer, srcProj, dstProj, extents,
496          """Draw the raster image in data onto the DC                                 resolution, dimensions, options):
497            """Return the projected raster image associated with the layer.
498    
499          The raster image data is a string holding the data in BMP          The returned value will be a tuple of the form
500          format. The data is exactly the size of the dc and covers it  
501          completely.              (image_data, mask_data, alpha_data)
502    
503            suitable for the data parameter to draw_raster_data.
504    
505            The return value may be None if raster projections are not supported.
506    
507            srcProj     --  a string describing the source projection
508            dstProj     --  a string describing the destination projection
509            extents     --  a tuple of the region to project in map coordinates
510            resolution  --  (currently not used, defaults to [0,0])
511            dimensions  --  a tuple (width, height) for the output image
512            options     --  bit-wise options to pass to the renderer
513    
514            the currently supported values for options are
515    
516                OPTS_MASK        = 1  -- generate a mask
517                OPTS_ALPHA       = 2  -- generate an alpha channel
518                OPTS_INVERT_MASK = 4  -- invert the values in the mask
519                                         (if generated)
520    
521          This method has to be implemented by derived classes.          This method has to be implemented by derived classes.
522          """          """
523    
524            raise NotImplementedError
525    
526        def draw_raster_data(self, x, y, data, format="BMP", opacity=1.0):
527            """Draw a raster image held in data onto the DC with the top
528            left corner at (x,y)
529    
530            The raster image data is a tuple of the form
531                (width, height, (image_data, mask_data, alpha_data))
532            
533            holding the image width, height, image data, mask data, and alpha data.
534            mask_data may be None if a mask should not be used. alpha_data may
535            also be None. If both are not None mask overrides alpha. If
536            format is 'RAW' the data will be RGB values and the mask
537            will be in XMB format. Otherwise, both kinds
538            of data are assumed to be in the format specified in format.
539    
540            The format parameter is a string with the name of the format.
541            The following format names should be used:
542    
543              'RAW'  -- an array of RGB values (len=3*width*height)
544              'PNG'  -- Portable Network Graphic (transparency supported)
545              'BMP'  -- Windows Bitmap
546              'TIFF' -- Tagged Image File Format
547              'GIF'  -- GIF Image
548              'JPEG' -- JPEG Image
549    
550            The default format is 'BMP'.
551    
552            This method has to be implemented by derived classes. The
553            implementation in the derived class should try to support at
554            least the formats specified above and may support more.
555            """
556          raise NotImplementedError          raise NotImplementedError
557    
558      def label_font(self):      def label_font(self):
# Line 461  class BaseRenderer: Line 581  class BaseRenderer:
581              text = label.text              text = label.text
582              if forward:              if forward:
583                  x, y = forward(x, y)                  x, y = forward(x, y)
584              x = x * scale + offx              x = int(round(x * scale + offx))
585              y = -y * scale + offy              y = int(round(-y * scale + offy))
586              width, height = self.dc.GetTextExtent(text)              width, height = self.dc.GetTextExtent(text)
587              if label.halign == ALIGN_LEFT:              if label.halign == ALIGN_LEFT:
588                  # nothing to be done                  # nothing to be done
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