/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1219 by bh, Mon Jun 16 17:42:54 2003 UTC revision 1355 by jonathan, Wed Jul 2 09:37:23 2003 UTC
# Line 19  from messages import LAYER_PROJECTION_CH Line 19  from messages import LAYER_PROJECTION_CH
19    
20  import classification  import classification
21    
22  from color import Color  from color import Transparent, Black
23  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
24    
25  import resource  import resource
# Line 99  class BaseLayer(TitledObject, Modifiable Line 99  class BaseLayer(TitledObject, Modifiable
99          """Determine if this layer support classifications."""          """Determine if this layer support classifications."""
100          return False          return False
101    
102        def HasShapes(self):
103            """Determine if this layer supports shapes."""
104            return False
105    
106      def GetProjection(self):      def GetProjection(self):
107          """Return the layer's projection."""          """Return the layer's projection."""
108          return self.projection          return self.projection
# Line 115  class Layer(BaseLayer): Line 119  class Layer(BaseLayer):
119      All children of the layer have the same type.      All children of the layer have the same type.
120    
121      A layer has fill and stroke colors. Colors should be instances of      A layer has fill and stroke colors. Colors should be instances of
122      Color. They can also be None, indicating no fill or no stroke.      Color. They can also be Transparent, indicating no fill or no stroke.
123    
124      The layer objects send the following events, all of which have the      The layer objects send the following events, all of which have the
125      layer object as parameter:      layer object as parameter:
# Line 125  class Layer(BaseLayer): Line 129  class Layer(BaseLayer):
129      """      """
130    
131      def __init__(self, title, data, projection = None,      def __init__(self, title, data, projection = None,
132                   fill = Color.Transparent,                   fill = Transparent,
133                   stroke = Color.Black,                   stroke = Black,
134                   lineWidth = 1,                   lineWidth = 1,
135                   visible = True):                   visible = True):
136          """Initialize the layer.          """Initialize the layer.
# Line 136  class Layer(BaseLayer): Line 140  class Layer(BaseLayer):
140          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
141                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
142                 coordinates                 coordinates
143          fill -- the fill color or Color.Transparent if the shapes are          fill -- the fill color or Transparent if the shapes are
144                  not filled                  not filled
145          stroke -- the stroke color or Color.Transparent if the shapes          stroke -- the stroke color or Transparent if the shapes
146                  are not stroked                  are not stroked
147          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
148    
# Line 153  class Layer(BaseLayer): Line 157  class Layer(BaseLayer):
157          # tries to set its parent layer the variable will exist          # tries to set its parent layer the variable will exist
158          #          #
159          self.__classification = None          self.__classification = None
         self.__setClassLock = False  
160    
161          self.SetShapeStore(data)          self.SetShapeStore(data)
162    
# Line 162  class Layer(BaseLayer): Line 165  class Layer(BaseLayer):
165          self.__classification.SetDefaultLineColor(stroke)          self.__classification.SetDefaultLineColor(stroke)
166          self.__classification.SetDefaultLineWidth(lineWidth)          self.__classification.SetDefaultLineWidth(lineWidth)
167          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
         self.__classification.SetLayer(self)  
168    
169          self.UnsetModified()          self.UnsetModified()
170    
# Line 233  class Layer(BaseLayer): Line 235  class Layer(BaseLayer):
235    
236      def Destroy(self):      def Destroy(self):
237          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
238          self.SetClassification(None)          self.GetClassification()._set_layer(None)
239    
240      def BoundingBox(self):      def BoundingBox(self):
241          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
# Line 295  class Layer(BaseLayer): Line 297  class Layer(BaseLayer):
297              return table.Column(fieldName).type              return table.Column(fieldName).type
298          return None          return None
299    
300        def HasShapes(self):
301            return True
302    
303      def NumShapes(self):      def NumShapes(self):
304          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
305          return self.numshapes          return self.numshapes
# Line 340  class Layer(BaseLayer): Line 345  class Layer(BaseLayer):
345          return self.__classification          return self.__classification
346    
347      def SetClassification(self, clazz):      def SetClassification(self, clazz):
348          """Set the classification to 'clazz'          """Set the classification used by this layer to 'clazz'
349    
350          If 'clazz' is None a default classification is created          If 'clazz' is None a default classification is created.
         """  
351    
352          # prevent infinite recursion when calling SetLayer()          ValueError is raised if the classification's field name
353          if self.__setClassLock: return          and type are different (if they aren't None) than what
354            is in the shapestore. The Layer will not be changed in
355            this case.
356            """
357    
358          self.__setClassLock = True          old_class = self.__classification
359    
360          if clazz is None:          if clazz is None:
361              if self.__classification is not None:              clazz = classification.Classification()
                 self.__classification.SetLayer(None)  
             self.__classification = classification.Classification()  
         else:  
             self.__classification = clazz  
             try:  
                 self.__classification.SetLayer(self)  
             except ValueError:  
                 self.__setClassLock = False  
                 raise ValueError  
362    
363          self.changed(LAYER_CHANGED, self)          try:
364                self.__classification = clazz
365                clazz._set_layer(self)
366    
367          self.__setClassLock = False              # only change things after a successful call
368                if old_class is not None:
369                    old_class._set_layer(None)
370            except ValueError:
371                self.__classification = old_class
372                raise ValueError
373    
374            # we don't need this since a message will be sent
375            # after calling _set_layer()
376            #self.changed(LAYER_CHANGED, self)
377    
378      def ClassChanged(self):      def ClassChanged(self):
379          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
# Line 373  class Layer(BaseLayer): Line 382  class Layer(BaseLayer):
382      def TreeInfo(self):      def TreeInfo(self):
383          items = []          items = []
384    
385          if hasattr(self, 'filename'):          items.append(_("Filename: %s") % self.ShapeStore().FileName())
             items.append(_("Filename: %s") % self.filename)  
386    
387          if self.Visible():          if self.Visible():
388              items.append(_("Shown"))              items.append(_("Shown"))
# Line 441  class RasterLayer(BaseLayer): Line 449  class RasterLayer(BaseLayer):
449      def BoundingBox(self):      def BoundingBox(self):
450          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
451    
452          If the layer has no shapes, return None.          If the there is no support for images, or the file cannot
453            be read, or there is no geographics information available, return None.
454          """          """
455          if not resource.has_gdal_support():          if not resource.has_gdal_support():
456              return None              return None
# Line 497  class RasterLayer(BaseLayer): Line 506  class RasterLayer(BaseLayer):
506      def TreeInfo(self):      def TreeInfo(self):
507          items = []          items = []
508    
509            items.append(_("Filename: %s") % self.GetImageFilename())
510    
511          if self.Visible():          if self.Visible():
512              items.append(_("Shown"))              items.append(_("Shown"))
513          else:          else:
514              items.append(_("Hidden"))              items.append(_("Hidden"))
         items.append(_("Shapes: %d") % self.NumShapes())  
515    
516          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
517          if bbox is not None:          if bbox is not None:
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