/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/map.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 178 by bh, Wed May 15 14:02:20 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 47  class Map(TitledObject, Modifiable): Line 47  class Map(TitledObject, Modifiable):
47      def Destroy(self):      def Destroy(self):
48          for layer in self.layers:          for layer in self.layers:
49              layer.Destroy()              layer.Destroy()
50            self.label_layer.Unsubscribe(CHANGED, self.forward, LAYERS_CHANGED)
51          Modifiable.Destroy(self)          Modifiable.Destroy(self)
52    
53      def AddLayer(self, layer):      def AddLayer(self, layer):
# Line 87  class Map(TitledObject, Modifiable): Line 88  class Map(TitledObject, Modifiable):
88          self.changed(LAYERS_CHANGED, self)          self.changed(LAYERS_CHANGED, self)
89    
90      def BoundingBox(self):      def BoundingBox(self):
91            """Return the bounding box of the map in projected coordinates.
92    
93            Return None if there are no layers or no layer contains any shapes.
94            """
95          if not self.layers:          if not self.layers:
96              return None              return None
97          llx = []          llx = []
# Line 96  class Map(TitledObject, Modifiable): Line 101  class Map(TitledObject, Modifiable):
101          for layer in self.layers:          for layer in self.layers:
102              if layer is self.label_layer:              if layer is self.label_layer:
103                  continue                  continue
104              left, bottom, right, top = layer.LatLongBoundingBox()              # the layer's bbox may be None if it doesn't have any layers
105              llx.append(left)              bbox = layer.LatLongBoundingBox()
106              lly.append(bottom)              if bbox is not None:
107              urx.append(right)                  left, bottom, right, top = bbox
108              ury.append(top)                  llx.append(left)
109          return (min(llx), min(lly), max(urx), max(ury))                  lly.append(bottom)
110                    urx.append(right)
111                    ury.append(top)
112    
113            # check whether there were any empty layers.
114            if llx:
115                return (min(llx), min(lly), max(urx), max(ury))
116            else:
117                return None
118    
119      def ProjectedBoundingBox(self):      def ProjectedBoundingBox(self):
120          # This simply returns the rectangle given by the projected          # This simply returns the rectangle given by the projected
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