/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 179 by bh, Wed May 15 14:02:49 2002 UTC revision 723 by bh, Thu Apr 24 15:31:53 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Jonathan Coles <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 9  __version__ = "$Revision$" Line 10  __version__ = "$Revision$"
10    
11  from math import log, ceil  from math import log, ceil
12    
13    from Thuban import _
14    
15  import shapelib, shptree  import shapelib, shptree
16    
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
18       LAYER_VISIBILITY_CHANGED       LAYER_CHANGED
19    
20  from color import Color  from color import Color
 # Some predefined colors for internal use  
 _black = Color(0, 0, 0)  
   
21    
22  from table import Table  import classification
23    
24  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
25    
26    
27  class Shape:  class Shape:
28    
29      """Represent one shape"""      """Represent one shape"""
# Line 83  class BaseLayer(TitledObject, Modifiable Line 84  class BaseLayer(TitledObject, Modifiable
84          """Set the layer's visibility."""          """Set the layer's visibility."""
85          self.visible = visible          self.visible = visible
86          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
87            
88            
89  class Layer(BaseLayer):  class Layer(BaseLayer):
90    
91      """Represent the information of one geodata file (currently a shapefile)      """Represent the information of one geodata file (currently a shapefile)
# Line 99  class Layer(BaseLayer): Line 100  class Layer(BaseLayer):
100    
101          TITLE_CHANGED -- The title has changed.          TITLE_CHANGED -- The title has changed.
102          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
         LAYER_LEGEND_CHANGED -- the fill or stroke attributes have changed  
   
103      """      """
104    
105      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
106                   fill = None, stroke = _black, stroke_width = 1, visible = 1):                   fill = Color.Transparent,
107                     stroke = Color.Black,
108                     lineWidth = 1,
109                     visible = 1):
110          """Initialize the layer.          """Initialize the layer.
111    
112          title -- the title          title -- the title
113          filename -- the name of the shapefile          data -- datastore object for the shape data shown by the layer
114          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
115                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
116                 coordinates                 coordinates
117          fill -- the fill color or None if the shapes are not filled          fill -- the fill color or Color.Transparent if the shapes are
118          stroke -- the stroke color or None if the shapes are not stroked                  not filled
119            stroke -- the stroke color or Color.Transparent if the shapes
120                    are not stroked
121          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
122    
123          colors are expected to be instances of Color class          colors are expected to be instances of Color class
124          """          """
125          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title, visible = visible)
126          self.filename = filename  
127          self.projection = projection          self.projection = projection
128          self.fill = fill  
129          self.stroke = stroke          #
130          self.stroke_width = stroke_width          # this is really important so that when the classification class
131          self.shapefile = None          # tries to set its parent layer the variable will exist
132          self.shapetree = None          #
133          self.open_shapefile()          self.__classification = None
134          # shapetable is the table associated with the shapefile, while          self.__setClassLock = False
135          # table is the default table used to look up attributes for  
136          # display          self.SetShapeStore(data)
137          self.shapetable = Table(filename)  
138            self.SetClassification(None)
139    
140            self.__classification.SetDefaultLineColor(stroke)
141            self.__classification.SetDefaultLineWidth(lineWidth)
142            self.__classification.SetDefaultFill(fill)
143            self.__classification.SetLayer(self)
144    
145            self.UnsetModified()
146    
147    
148        def SetShapeStore(self, store):
149            self.store = store
150            self.shapefile = self.store.Shapefile()
151            self.shapetable = self.store.Table()
152            self.filename = self.store.filename
153          self.table = self.shapetable          self.table = self.shapetable
154    
155      def open_shapefile(self):          numshapes, shapetype, mins, maxs = self.shapefile.info()
156          if self.shapefile is None:          self.numshapes = numshapes
157              self.shapefile = shapelib.ShapeFile(self.filename)          self.shapetype = shapelib_shapetypes[shapetype]
158              numshapes, shapetype, mins, maxs = self.shapefile.info()  
159              self.numshapes = numshapes          # if there are shapes, set the bbox accordingly. Otherwise
160              self.shapetype = shapelib_shapetypes[shapetype]          # set it to None.
161            if self.numshapes:
162              # if there are shapes, set the bbox accordinly. Otherwise              self.bbox = mins[:2] + maxs[:2]
163              # set it to None.          else:
164              if self.numshapes:              self.bbox = None
165                  self.bbox = mins[:2] + maxs[:2]  
166              else:          # estimate a good depth for the quad tree. Each depth
167                  self.bbox = None          # multiplies the number of nodes by four, therefore we
168            # basically take the base 4 logarithm of the number of
169              # estimate a good depth for the quad tree. Each depth          # shapes.
170              # multiplies the number of nodes by four, therefore we          if self.numshapes < 4:
171              # basically take the base 4 logarithm of the number of              maxdepth = 1
172              # shapes.          else:
173              if self.numshapes < 4:              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
                 maxdepth = 1  
             else:  
                 maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))  
174    
175              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,          self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
176                                               maxdepth)                                           maxdepth)
177            if self.__classification is not None:
178                fieldname = self.__classification.GetField()
179                if not self.store.Table().field_info_by_name(fieldname):
180                    self.SetClassification(None)
181            self.changed(LAYER_CHANGED, self)
182    
183        def ShapeStore(self):
184            return self.store
185    
186        def Destroy(self):
187            BaseLayer.Destroy(self)
188            self.SetClassification(None)
189    
190      def BoundingBox(self):      def BoundingBox(self):
191          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
192    
193          If the layer has no shapes, return None.          If the layer has no shapes, return None.
194          """          """
         # The bbox will be set by open_shapefile just as we need it  
         # here.  
         self.open_shapefile()  
195          return self.bbox          return self.bbox
196    
197      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
# Line 184  class Layer(BaseLayer): Line 209  class Layer(BaseLayer):
209          else:          else:
210              return None              return None
211    
212        def GetFieldType(self, fieldName):
213            info = self.table.field_info_by_name(fieldName)
214            if info is not None:
215                return info[0]
216            else:
217                return None
218    
219      def NumShapes(self):      def NumShapes(self):
220          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
221          return self.numshapes          return self.numshapes
222    
223      def ShapeType(self):      def ShapeType(self):
224          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
225          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
226          """          """
         self.open_shapefile()  
227          return self.shapetype          return self.shapetype
228    
229      def Shape(self, index):      def Shape(self, index):
230          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
231          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
232    
233          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
234              points = shape.vertices()              points = shape.vertices()
235          else:          else:
# Line 208  class Layer(BaseLayer): Line 238  class Layer(BaseLayer):
238              points = []              points = []
239              for x, y in poly:              for x, y in poly:
240                  points.append((x, y))                  points.append((x, y))
241    
242          return Shape(points)          return Shape(points)
243    
244      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
# Line 224  class Layer(BaseLayer): Line 255  class Layer(BaseLayer):
255          self.projection = projection          self.projection = projection
256          self.changed(LAYER_PROJECTION_CHANGED, self)          self.changed(LAYER_PROJECTION_CHANGED, self)
257    
258      def SetFill(self, fill):      def GetClassification(self):
259          """Set the layer's fill color. None means the shapes are not filled"""          return self.__classification
260          self.fill = fill  
261          self.changed(LAYER_LEGEND_CHANGED, self)      def SetClassification(self, clazz):
262            """Set the classification to 'clazz'
263      def SetStroke(self, stroke):  
264          """Set the layer's stroke color. None means the shapes are not          If 'clazz' is None a default classification is created
265          stroked."""          """
266          self.stroke = stroke  
267          self.changed(LAYER_LEGEND_CHANGED, self)          # prevent infinite recursion when calling SetLayer()
268            if self.__setClassLock: return
269      def SetStrokeWidth(self, width):  
270          """Set the layer's stroke width."""          self.__setClassLock = True
271          self.stroke_width = width  
272          self.changed(LAYER_LEGEND_CHANGED, self)          if clazz is None:
273                if self.__classification is not None:
274                    self.__classification.SetLayer(None)
275                self.__classification = classification.Classification()
276            else:
277                self.__classification = clazz
278                try:
279                    self.__classification.SetLayer(self)
280                except ValueError:
281                    self.__setClassLock = False
282                    raise ValueError
283    
284            self.changed(LAYER_CHANGED, self)
285    
286            self.__setClassLock = False
287    
288        def ClassChanged(self):
289            """Called from the classification object when it has changed."""
290            self.changed(LAYER_CHANGED, self)
291    
292        def TreeInfo(self):
293            items = []
294    
295            if self.Visible():
296                items.append(_("Shown"))
297            else:
298                items.append(_("Hidden"))
299            items.append(_("Shapes: %d") % self.NumShapes())
300    
301            bbox = self.LatLongBoundingBox()
302            if bbox is not None:
303                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
304            else:
305                items.append(_("Extent (lat-lon):"))
306            items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
307    
308            items.append(self.__classification)
309    
310            return (_("Layer '%s'") % self.Title(), items)
311    
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