/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 148 by bh, Tue May 7 16:40:29 2002 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 by Intevation GmbH  # Copyright (c) 2001, 2002 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  #  #
# Line 72  class MapRenderer: Line 72  class MapRenderer:
72                               fill.blue * 255)                               fill.blue * 255)
73              brush = wxBrush(color, wxSOLID)              brush = wxBrush(color, wxSOLID)
74          stroke = layer.stroke          stroke = layer.stroke
75            stroke_width = layer.stroke_width
76          if stroke is None:          if stroke is None:
77              pen = wxTRANSPARENT_PEN              pen = wxTRANSPARENT_PEN
78          else:          else:
79              color = wxColour(stroke.red * 255,              color = wxColour(stroke.red * 255,
80                               stroke.green * 255,                               stroke.green * 255,
81                               stroke.blue * 255)                               stroke.blue * 255)
82              pen = wxPen(color, 1, wxSOLID)              pen = wxPen(color, stroke_width, wxSOLID)
83    
84          map_proj = self.map.projection          map_proj = self.map.projection
85          layer_proj = layer.projection          layer_proj = layer.projection
# Line 86  class MapRenderer: Line 87  class MapRenderer:
87          shapetype = layer.ShapeType()          shapetype = layer.ShapeType()
88    
89          if shapetype == SHAPETYPE_POLYGON:          if shapetype == SHAPETYPE_POLYGON:
90              for i in range(layer.NumShapes()):              for i in self.layer_ids(layer):
91                  self.draw_polygon_shape(layer, i, pen, brush)                  self.draw_polygon_shape(layer, i, pen, brush)
92            elif shapetype == SHAPETYPE_ARC:
93                for i in self.layer_ids(layer):
94                    self.draw_polygon_shape(layer, i, pen, None)
95          else:          else:
96              self.dc.SetBrush(brush)              self.dc.SetBrush(brush)
97              self.dc.SetPen(pen)              self.dc.SetPen(pen)
# Line 95  class MapRenderer: Line 99  class MapRenderer:
99                  f = self.draw_arc_shape                  f = self.draw_arc_shape
100              elif shapetype == SHAPETYPE_POINT:              elif shapetype == SHAPETYPE_POINT:
101                  f = self.draw_point_shape                  f = self.draw_point_shape
102              for i in range(layer.NumShapes()):              for i in self.layer_ids(layer):
103                  f(layer, i)                  f(layer, i)
104    
105        def layer_ids(self, layer):
106            """Return the shape ids of the given layer that have to be drawn.
107            
108            The default implementation simply returns all ids in the layer.
109            Override in derived classes to be more precise.
110            """
111            return range(layer.NumShapes())
112    
113      def draw_polygon_shape(self, layer, index, pen, brush):      def draw_polygon_shape(self, layer, index, pen, brush):
114          offx, offy = self.offset                  offx, offy = self.offset        
115          draw_polygon_shape(layer.shapefile.cobject(), index,          draw_polygon_shape(layer.shapefile.cobject(), index,
# Line 182  class ScreenRenderer(MapRenderer): Line 194  class ScreenRenderer(MapRenderer):
194      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
195      honor_visibility = 1      honor_visibility = 1
196            
197      def RenderMap(self, map, selected_layer, selected_shape):      def RenderMap(self, map, region, selected_layer, selected_shape):
198            """Render the map.
199    
200            Only the given region (a tuple in window coordinates as returned
201            by a wxrect's asTuple method) needs to be redrawn. Highlight the
202            shape with id selected_shape in the selected_layer.
203            """
204            self.update_region = region
205          self.selected_layer = selected_layer          self.selected_layer = selected_layer
206          self.selected_shape = selected_shape          self.selected_shape = selected_shape
207          self.render_map(map)          self.render_map(map)
# Line 206  class ScreenRenderer(MapRenderer): Line 225  class ScreenRenderer(MapRenderer):
225                      f = self.draw_point_shape                      f = self.draw_point_shape
226                  f(layer, index)                  f(layer, index)
227    
228        def layer_ids(self, layer):
229            """Return the shapeids covered by the region that has to be redrawn
230    
231            Call the layer's ShapesInRegion method to determine the ids so
232            that it can use the quadtree.
233            """
234            # FIXME: the quad-tree should be built from the projected
235            # coordinates not the lat-long ones because it's not trivial to
236            # determine an appropriate rectangle in lat-long for a given
237            # rectangle in projected coordinates which we have to start from
238            # here.
239            proj = self.map.projection
240            if proj is not None:
241                inverse = proj.Inverse
242            else:
243                inverse = None
244    
245            scale = self.scale
246            offx, offy = self.offset
247            xs = []
248            ys = []
249            x, y, width, height = self.update_region
250            for winx, winy in ((x, y), (x + width, y),
251                               (x + width, y + height), (x, y + height)):
252                px = (winx - offx) / scale
253                py = -(winy - offy) / scale
254                if inverse:
255                    px, py = inverse(px, py)
256                xs.append(px)
257                ys.append(py)
258            left = min(xs)
259            right = max(xs)
260            top = max(ys)
261            bottom = min(ys)
262    
263            return layer.ShapesInRegion((left, bottom, right, top))
264    
265    
266  class PrinterRender(MapRenderer):  class PrinterRender(MapRenderer):
267    
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