/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 179 by bh, Wed May 15 14:02:49 2002 UTC revision 558 by jonathan, Wed Mar 26 11:05:20 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002 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.
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
11    import os
12  from math import log, ceil  from math import log, ceil
13    
14    from Thuban import _
15    
16  import shapelib, shptree  import shapelib, shptree
17    
18  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \
19       LAYER_VISIBILITY_CHANGED       LAYER_VISIBILITY_CHANGED, LAYER_CHANGED
20    
21  from color import Color  from color import Color
 # Some predefined colors for internal use  
 _black = Color(0, 0, 0)  
22    
23    import classification
24    
25  from table import Table  from table import Table
26    
# Line 83  class BaseLayer(TitledObject, Modifiable Line 86  class BaseLayer(TitledObject, Modifiable
86          """Set the layer's visibility."""          """Set the layer's visibility."""
87          self.visible = visible          self.visible = visible
88          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
89            
90            
91  class Layer(BaseLayer):  class Layer(BaseLayer):
92    
93      """Represent the information of one geodata file (currently a shapefile)      """Represent the information of one geodata file (currently a shapefile)
# Line 104  class Layer(BaseLayer): Line 107  class Layer(BaseLayer):
107      """      """
108    
109      def __init__(self, title, filename, projection = None,      def __init__(self, title, filename, projection = None,
110                   fill = None, stroke = _black, stroke_width = 1, visible = 1):                   fill = Color.None,
111                     stroke = Color.Black,
112                     lineWidth = 1,
113                     visible = 1):
114          """Initialize the layer.          """Initialize the layer.
115    
116          title -- the title          title -- the title
# Line 112  class Layer(BaseLayer): Line 118  class Layer(BaseLayer):
118          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
119                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
120                 coordinates                 coordinates
121          fill -- the fill color or None if the shapes are not filled          fill -- the fill color or Color.None if the shapes are not filled
122          stroke -- the stroke color or None if the shapes are not stroked          stroke -- the stroke color or Color.None if the shapes are not stroked
123          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
124    
125          colors are expected to be instances of Color class          colors are expected to be instances of Color class
126          """          """
127          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title, visible = visible)
128          self.filename = filename  
129            # Make the filename absolute. The filename will be
130            # interpreted relative to that anyway, but when saving a
131            # session we need to compare absolute paths and it's usually
132            # safer to always work with absolute paths.
133            self.filename = os.path.abspath(filename)
134    
135          self.projection = projection          self.projection = projection
         self.fill = fill  
         self.stroke = stroke  
         self.stroke_width = stroke_width  
136          self.shapefile = None          self.shapefile = None
137          self.shapetree = None          self.shapetree = None
138          self.open_shapefile()          self.open_shapefile()
# Line 133  class Layer(BaseLayer): Line 142  class Layer(BaseLayer):
142          self.shapetable = Table(filename)          self.shapetable = Table(filename)
143          self.table = self.shapetable          self.table = self.shapetable
144    
145            #
146            # this is really important so that when the classification class
147            # tries to set its parent layer the variable will exist
148            #
149            self.__classification = None
150            self.__setClassLock = False
151    
152    
153            self.SetClassification(None)
154    
155            self.__classification.SetDefaultLineColor(stroke)
156            self.__classification.SetDefaultLineWidth(lineWidth)
157            self.__classification.SetDefaultFill(fill)
158            self.__classification.SetLayer(self)
159    
160            self.UnsetModified()
161    
162      def open_shapefile(self):      def open_shapefile(self):
163          if self.shapefile is None:          if self.shapefile is None:
164              self.shapefile = shapelib.ShapeFile(self.filename)              self.shapefile = shapelib.ShapeFile(self.filename)
# Line 159  class Layer(BaseLayer): Line 185  class Layer(BaseLayer):
185              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
186                                               maxdepth)                                               maxdepth)
187    
188        def Destroy(self):
189            BaseLayer.Destroy(self)
190            if self.shapefile is not None:
191                self.shapefile.close()
192                self.shapefile = None
193                self.shapetree = None
194            self.SetClassification(None)
195            self.table.Destroy()
196    
197      def BoundingBox(self):      def BoundingBox(self):
198          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
199    
# Line 184  class Layer(BaseLayer): Line 219  class Layer(BaseLayer):
219          else:          else:
220              return None              return None
221    
222        def GetFieldType(self, fieldName):
223            self.open_shapefile()
224            info = self.table.field_info_by_name(fieldName)
225            if info is not None:
226                return info[0]
227            else:
228                return None
229    
230      def NumShapes(self):      def NumShapes(self):
231          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
232          self.open_shapefile()          self.open_shapefile()
# Line 200  class Layer(BaseLayer): Line 243  class Layer(BaseLayer):
243          """Return the shape with index index"""          """Return the shape with index index"""
244          self.open_shapefile()          self.open_shapefile()
245          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
246    
247          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
248              points = shape.vertices()              points = shape.vertices()
249          else:          else:
# Line 208  class Layer(BaseLayer): Line 252  class Layer(BaseLayer):
252              points = []              points = []
253              for x, y in poly:              for x, y in poly:
254                  points.append((x, y))                  points.append((x, y))
255    
256          return Shape(points)          return Shape(points)
257    
258      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
# Line 224  class Layer(BaseLayer): Line 269  class Layer(BaseLayer):
269          self.projection = projection          self.projection = projection
270          self.changed(LAYER_PROJECTION_CHANGED, self)          self.changed(LAYER_PROJECTION_CHANGED, self)
271    
272      def SetFill(self, fill):      def GetClassification(self):
273          """Set the layer's fill color. None means the shapes are not filled"""          return self.__classification
274          self.fill = fill  
275          self.changed(LAYER_LEGEND_CHANGED, self)      def SetClassification(self, clazz):
276            """Set the classification to 'clazz'
277      def SetStroke(self, stroke):  
278          """Set the layer's stroke color. None means the shapes are not          If 'clazz' is None a default classification is created
279          stroked."""          """
280          self.stroke = stroke  
281          self.changed(LAYER_LEGEND_CHANGED, self)          # prevent infinite recursion when calling SetLayer()
282            if self.__setClassLock: return
283      def SetStrokeWidth(self, width):  
284          """Set the layer's stroke width."""          self.__setClassLock = True
285          self.stroke_width = width  
286          self.changed(LAYER_LEGEND_CHANGED, self)          if clazz is None:
287                if self.__classification is not None:
288                    self.__classification.SetLayer(None)
289                self.__classification = classification.Classification()
290            else:
291                self.__classification = clazz
292                try:
293                    self.__classification.SetLayer(self)
294                except ValueError:
295                    self.__setClassLock = False
296                    raise ValueError
297    
298            self.changed(LAYER_CHANGED, self)
299    
300            self.__setClassLock = False
301    
302        def ClassChanged(self):
303            """Called from the classification object when it has changed."""
304            self.changed(LAYER_CHANGED, self)
305    
306        def TreeInfo(self):
307            items = []
308    
309            if self.Visible():
310                items.append(_("Shown"))
311            else:
312                items.append(_("Hidden"))
313            items.append(_("Shapes: %d") % self.NumShapes())
314    
315            bbox = self.LatLongBoundingBox()
316            if bbox is not None:
317                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
318            else:
319                items.append(_("Extent (lat-lon):"))
320            items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
321    
322            items.append(self.__classification)
323    
324            return (_("Layer '%s'") % self.Title(), items)
325    
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