/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1983 by bh, Thu Nov 27 15:57:23 2003 UTC revision 2343 by bernhard, Mon Sep 20 08:13:32 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]>
5    # Silke Reimer <[email protected]>
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 54  class BaseLayer(TitledObject, Modifiable Line 55  class BaseLayer(TitledObject, Modifiable
55          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
56    
57      def HasClassification(self):      def HasClassification(self):
58          """Determine if this layer support classifications."""          """Determine if this layer supports classifications."""
59          return False          return False
60    
61      def HasShapes(self):      def HasShapes(self):
# Line 66  class BaseLayer(TitledObject, Modifiable Line 67  class BaseLayer(TitledObject, Modifiable
67          return self.projection          return self.projection
68    
69      def SetProjection(self, projection):      def SetProjection(self, projection):
70          """Set the layer's projection"""          """Set the layer's projection."""
71          self.projection = projection          self.projection = projection
72          self.changed(LAYER_PROJECTION_CHANGED, self)          self.changed(LAYER_PROJECTION_CHANGED, self)
73    
# Line 226  class Layer(BaseLayer): Line 227  class Layer(BaseLayer):
227          form (minx, miny, maxx, maxy) in unprojected coordinates.          form (minx, miny, maxx, maxy) in unprojected coordinates.
228          """          """
229          if self.projection is not None:          if self.projection is not None:
230              bbox = self.projection.ForwardBBox(bbox)              # Ensure that region lies within the layer's bounding box
231                # Otherwise projection of the region would lead to incorrect
232                # values.
233                clipbbox = self.ClipBoundingBox(bbox)
234                bbox = self.projection.ForwardBBox(clipbbox)
235          return self.store.ShapesInRegion(bbox)          return self.store.ShapesInRegion(bbox)
236    
237      def GetClassificationColumn(self):      def GetClassificationColumn(self):
# Line 289  class Layer(BaseLayer): Line 294  class Layer(BaseLayer):
294    
295          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
296          if bbox is not None:          if bbox is not None:
297              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % tuple(bbox))
298          else:          else:
299              items.append(_("Extent (lat-lon):"))              items.append(_("Extent (lat-lon):"))
300          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
# Line 302  class Layer(BaseLayer): Line 307  class Layer(BaseLayer):
307    
308          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
309    
310        def ClipBoundingBox(self, bbox):
311            """ Clip bbox to layer's bounding box.
312    
313            Returns that part of bbox that lies within the layers bounding box.
314            If bbox is completely outside of the layers bounding box, bbox is
315            returned.  It is assumed that bbox has sensible values, i.e. bminx
316            < bmaxx and bminy < bmaxy.
317            """
318            bminx, bminy, bmaxx, bmaxy = bbox
319            lminx, lminy, lmaxx, lmaxy = self.LatLongBoundingBox()
320            if bminx > lmaxx or bmaxx < lminx:
321                left, right = bminx, bmaxx
322            else:
323                left = max(lminx, bminx)
324                right = min(lmaxx, bmaxx)
325            if bminy > lmaxy or bmaxy < lminy:
326                bottom, top = bminy, bmaxy
327            else:
328                bottom = max(lminy, bminy)
329                top = min(lmaxy, bmaxy)
330            
331            return (left, bottom, right, top)
332    
333    
334  if resource.has_gdal_support():  if resource.has_gdal_support():
335      import gdal      import gdal
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