/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/baserenderer.py
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revision 1926 by bh, Mon Nov 10 16:57:19 2003 UTC revision 2413 by bernhard, Mon Nov 22 11:16:35 2004 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 42  if Thuban.Model.resource.has_gdal_suppor Line 42  if Thuban.Model.resource.has_gdal_suppor
42  # (layer_class, draw_function) pairs. If the renderer has to draw a  # (layer_class, draw_function) pairs. If the renderer has to draw a
43  # non-builtin layer type, i.e. a layer that is not a subclass of Layer  # non-builtin layer type, i.e. a layer that is not a subclass of Layer
44  # or RasterLayer, it iterates through that list, tests whether the layer  # or RasterLayer, it iterates through that list, tests whether the layer
45  # to be drawin is an instance of layer_class and if so calls  # to be drawn is an instance of layer_class and if so calls
46  # draw_function with the renderer and the layer as arguments. Since  # draw_function with the renderer and the layer as arguments. Since
47  # drawing is done incrementally, the draw_function should return an  # drawing is done incrementally, the draw_function should return an
48  # iterable. The easiest way is to simply implement the draw_function as  # iterable. The easiest way is to simply implement the draw_function as
# Line 64  def add_renderer_extension(layer_class, Line 64  def add_renderer_extension(layer_class,
64      function should return an iterable. The easiest way is to simply      function should return an iterable. The easiest way is to simply
65      implement the draw_function as a generator and to yield True in      implement the draw_function as a generator and to yield True in
66      suitable places, or to return the empty tuple if it's not possible      suitable places, or to return the empty tuple if it's not possible
67      to do the rendering in incrementally.      to do the rendering incrementally.
68      """      """
69      _renderer_extensions.append((layer_class, function))      _renderer_extensions.append((layer_class, function))
70    
# Line 198  class BaseRenderer: Line 198  class BaseRenderer:
198              # if honor_visibility is true, only draw visible layers,              # if honor_visibility is true, only draw visible layers,
199              # otherwise draw all layers              # otherwise draw all layers
200              if not self.honor_visibility or layer.Visible():              if not self.honor_visibility or layer.Visible():
201                  if isinstance(layer, Layer) and seenRaster:                  if isinstance(layer, Layer):
202                      for i in self.draw_shape_layer_incrementally(layer):                      if seenRaster:
203                          yield True                          for i in self.draw_shape_layer_incrementally(layer):
204                                yield True
205                  elif isinstance(layer, RasterLayer) \                  elif isinstance(layer, RasterLayer) \
206                      and Thuban.Model.resource.has_gdal_support():                      and Thuban.Model.resource.has_gdal_support():
207                      self.draw_raster_layer(layer)                      self.draw_raster_layer(layer)
# Line 288  class BaseRenderer: Line 289  class BaseRenderer:
289                  data = shape.RawData()                  data = shape.RawData()
290              else:              else:
291                  data = shape.Points()                  data = shape.Points()
292              draw_func(draw_func_param, data, pen, brush)              if draw_func == self.draw_point_shape:
293                     draw_func(draw_func_param, data, pen, brush,
294                               size = group.GetProperties().GetSize())
295                else:
296                     draw_func(draw_func_param, data, pen, brush)
297              if count % 500 == 0:              if count % 500 == 0:
298                  yield True                  yield True
299    
# Line 383  class BaseRenderer: Line 388  class BaseRenderer:
388          value of the shape's Points() method. The coordinates in the          value of the shape's Points() method. The coordinates in the
389          DC's coordinate system are determined with          DC's coordinate system are determined with
390          self.projected_points.          self.projected_points.
391    
392            For a description of the algorithm look in wxproj.cpp.
393          """          """
394          points = self.projected_points(layer, points)          points = self.projected_points(layer, points)
395    
# Line 391  class BaseRenderer: Line 398  class BaseRenderer:
398              for part in points:              for part in points:
399                  polygon.extend(part)                  polygon.extend(part)
400    
401                # missing back vertices for correct filling.
402              insert_index = len(polygon)              insert_index = len(polygon)
403              for part in points[:-1]:              for part in points[:-1]:
404                  polygon.insert(insert_index, part[0])                  polygon.insert(insert_index, part[0])
# Line 420  class BaseRenderer: Line 428  class BaseRenderer:
428          for part in points:          for part in points:
429              self.dc.DrawLines(part)              self.dc.DrawLines(part)
430    
431      def draw_point_shape(self, layer, points, pen, brush):      def draw_point_shape(self, layer, points, pen, brush, size = 5):
432          """Draw a point shape from layer with the given brush and pen          """Draw a point shape from layer with the given brush and pen
433    
434          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 434  class BaseRenderer: Line 442  class BaseRenderer:
442          if not points:          if not points:
443              return              return
444    
445          radius = self.resolution * 5          radius = int(round(self.resolution * size))
446          self.dc.SetBrush(brush)          self.dc.SetBrush(brush)
447          self.dc.SetPen(pen)          self.dc.SetPen(pen)
448          for part in points:          for part in points:
# Line 531  class BaseRenderer: Line 539  class BaseRenderer:
539              text = label.text              text = label.text
540              if forward:              if forward:
541                  x, y = forward(x, y)                  x, y = forward(x, y)
542              x = x * scale + offx              x = int(round(x * scale + offx))
543              y = -y * scale + offy              y = int(round(-y * scale + offy))
544              width, height = self.dc.GetTextExtent(text)              width, height = self.dc.GetTextExtent(text)
545              if label.halign == ALIGN_LEFT:              if label.halign == ALIGN_LEFT:
546                  # nothing to be done                  # nothing to be done
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