/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 76 by bh, Mon Feb 4 19:23:30 2002 UTC revision 362 by jonathan, Mon Jan 27 11:39:03 2003 UTC
# Line 63  class MapRenderer: Line 63  class MapRenderer:
63          scale = self.scale          scale = self.scale
64          offx, offy = self.offset          offx, offy = self.offset
65    
         fill = layer.fill  
         if fill is None:  
             brush = wxTRANSPARENT_BRUSH  
         else:  
             color = wxColour(fill.red * 255,  
                              fill.green * 255,  
                              fill.blue * 255)  
             brush = wxBrush(color, wxSOLID)  
         stroke = layer.stroke  
         stroke_width = layer.stroke_width  
         if stroke is None:  
             pen = wxTRANSPARENT_PEN  
         else:  
             color = wxColour(stroke.red * 255,  
                              stroke.green * 255,  
                              stroke.blue * 255)  
             pen = wxPen(color, stroke_width, wxSOLID)  
   
66          map_proj = self.map.projection          map_proj = self.map.projection
67          layer_proj = layer.projection          layer_proj = layer.projection
68    
69          shapetype = layer.ShapeType()          shapetype = layer.ShapeType()
70    
71          if shapetype == SHAPETYPE_POLYGON:          brush = wxTRANSPARENT_BRUSH
72              for i in range(layer.NumShapes()):          pen   = wxTRANSPARENT_PEN
73    
74            old_prop = None
75            for i in self.layer_ids(layer):
76                value = None
77                shape = layer.Shape(i)
78                field = layer.classification.field
79    
80                if field is not None:
81                    record = layer.table.read_record(i)
82                    if record is not None:
83                        value = record[field]
84    
85                #
86                # if the above statements fail 'value' should
87                # be null, at which point this call will
88                # at least retreive the NullData
89                #
90                prop = layer.classification.getProperties(value)
91    
92                if prop != old_prop:
93                    old_prop = prop
94    
95                    if shapetype == SHAPETYPE_ARC:
96                        fill = None
97                    else:
98                        fill = prop['fill']
99        
100                    if fill is None:
101                        brush = wxTRANSPARENT_BRUSH
102                    else:
103                        color = wxColour(fill.red * 255,
104                                         fill.green * 255,
105                                         fill.blue * 255)
106                        brush = wxBrush(color, wxSOLID)
107        
108                    stroke = prop['stroke']
109                    stroke_width = prop['stroke_width']
110                    if stroke is None:
111                        pen = wxTRANSPARENT_PEN
112                    else:
113                        color = wxColour(stroke.red * 255,
114                                         stroke.green * 255,
115                                         stroke.blue * 255)
116                        pen = wxPen(color, stroke_width, wxSOLID)
117        
118                if shapetype == SHAPETYPE_POINT:
119                    self.dc.SetBrush(brush)
120                    self.dc.SetPen(pen)
121                    self.draw_point_shape(layer, i)
122                else:
123                  self.draw_polygon_shape(layer, i, pen, brush)                  self.draw_polygon_shape(layer, i, pen, brush)
124          else:  
125              self.dc.SetBrush(brush)      def layer_ids(self, layer):
126              self.dc.SetPen(pen)          """Return the shape ids of the given layer that have to be drawn.
127              if shapetype == SHAPETYPE_ARC:          
128                  f = self.draw_arc_shape          The default implementation simply returns all ids in the layer.
129              elif shapetype == SHAPETYPE_POINT:          Override in derived classes to be more precise.
130                  f = self.draw_point_shape          """
131              for i in range(layer.NumShapes()):          return range(layer.NumShapes())
                 f(layer, i)  
132    
133      def draw_polygon_shape(self, layer, index, pen, brush):      def draw_polygon_shape(self, layer, index, pen, brush):
134          offx, offy = self.offset                  offx, offy = self.offset        
# Line 183  class ScreenRenderer(MapRenderer): Line 214  class ScreenRenderer(MapRenderer):
214      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
215      honor_visibility = 1      honor_visibility = 1
216            
217      def RenderMap(self, map, selected_layer, selected_shape):      def RenderMap(self, map, region, selected_layer, selected_shape):
218            """Render the map.
219    
220            Only the given region (a tuple in window coordinates as returned
221            by a wxrect's asTuple method) needs to be redrawn. Highlight the
222            shape with id selected_shape in the selected_layer.
223            """
224            self.update_region = region
225          self.selected_layer = selected_layer          self.selected_layer = selected_layer
226          self.selected_shape = selected_shape          self.selected_shape = selected_shape
227          self.render_map(map)          self.render_map(map)
# Line 198  class ScreenRenderer(MapRenderer): Line 236  class ScreenRenderer(MapRenderer):
236              index = self.selected_shape              index = self.selected_shape
237              if shapetype == SHAPETYPE_POLYGON:              if shapetype == SHAPETYPE_POLYGON:
238                  self.draw_polygon_shape(layer, index, pen, brush)                  self.draw_polygon_shape(layer, index, pen, brush)
239                elif shapetype == SHAPETYPE_ARC:
240                    self.draw_polygon_shape(layer, index, pen, None)
241              else:              else:
242                  self.dc.SetBrush(brush)                  self.dc.SetBrush(brush)
243                  self.dc.SetPen(pen)                  self.dc.SetPen(pen)
244                  if shapetype == SHAPETYPE_ARC:                  if shapetype == SHAPETYPE_POINT:
245                      f = self.draw_arc_shape                      self.draw_point_shape(layer, index)
246                  elif shapetype == SHAPETYPE_POINT:                  else:
247                      f = self.draw_point_shape                      raise TypeError("Unhandled shape type %s" % shapetype)
248                  f(layer, index)  
249        def layer_ids(self, layer):
250            """Return the shapeids covered by the region that has to be redrawn
251    
252            Call the layer's ShapesInRegion method to determine the ids so
253            that it can use the quadtree.
254            """
255            # FIXME: the quad-tree should be built from the projected
256            # coordinates not the lat-long ones because it's not trivial to
257            # determine an appropriate rectangle in lat-long for a given
258            # rectangle in projected coordinates which we have to start from
259            # here.
260            proj = self.map.projection
261            if proj is not None:
262                inverse = proj.Inverse
263            else:
264                inverse = None
265    
266            scale = self.scale
267            offx, offy = self.offset
268            xs = []
269            ys = []
270            x, y, width, height = self.update_region
271            for winx, winy in ((x, y), (x + width, y),
272                               (x + width, y + height), (x, y + height)):
273                px = (winx - offx) / scale
274                py = -(winy - offy) / scale
275                if inverse:
276                    px, py = inverse(px, py)
277                xs.append(px)
278                ys.append(py)
279            left = min(xs)
280            right = max(xs)
281            top = max(ys)
282            bottom = min(ys)
283    
284            return layer.ShapesInRegion((left, bottom, right, top))
285    
286    
287  class PrinterRender(MapRenderer):  class PrinterRender(MapRenderer):
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