/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 260 by bh, Thu Aug 15 17:43:59 2002 UTC revision 492 by jonathan, Mon Mar 10 10:44:57 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
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    
151    
152            self.SetClassification(None)
153    
154            self.__classification.SetDefaultLineColor(stroke)
155            self.__classification.SetDefaultLineWidth(lineWidth)
156            self.__classification.SetDefaultFill(fill)
157            self.__classification.SetLayer(self)
158    
159            self.UnsetModified()
160    
161      def open_shapefile(self):      def open_shapefile(self):
162          if self.shapefile is None:          if self.shapefile is None:
163              self.shapefile = shapelib.ShapeFile(self.filename)              self.shapefile = shapelib.ShapeFile(self.filename)
# Line 192  class Layer(BaseLayer): Line 217  class Layer(BaseLayer):
217          else:          else:
218              return None              return None
219    
220        def GetFieldType(self, fieldName):
221            self.open_shapefile()
222            info = self.table.field_info_by_name(fieldName)
223            if info is not None:
224                return info[0]
225            else:
226                return None
227    
228      def NumShapes(self):      def NumShapes(self):
229          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
230          self.open_shapefile()          self.open_shapefile()
# Line 208  class Layer(BaseLayer): Line 241  class Layer(BaseLayer):
241          """Return the shape with index index"""          """Return the shape with index index"""
242          self.open_shapefile()          self.open_shapefile()
243          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
244    
245          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
246              points = shape.vertices()              points = shape.vertices()
247          else:          else:
# Line 216  class Layer(BaseLayer): Line 250  class Layer(BaseLayer):
250              points = []              points = []
251              for x, y in poly:              for x, y in poly:
252                  points.append((x, y))                  points.append((x, y))
253    
254          return Shape(points)          return Shape(points)
255    
256      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
# Line 232  class Layer(BaseLayer): Line 267  class Layer(BaseLayer):
267          self.projection = projection          self.projection = projection
268          self.changed(LAYER_PROJECTION_CHANGED, self)          self.changed(LAYER_PROJECTION_CHANGED, self)
269    
270      def SetFill(self, fill):      def GetClassification(self):
271          """Set the layer's fill color. None means the shapes are not filled"""          return self.__classification
         self.fill = fill  
         self.changed(LAYER_LEGEND_CHANGED, self)  
272    
273      def SetStroke(self, stroke):      def SetClassification(self, clazz):
274          """Set the layer's stroke color. None means the shapes are not          """Set the classification to 'clazz'
275          stroked."""  
276          self.stroke = stroke          If 'clazz' is None a default classification is created
277          self.changed(LAYER_LEGEND_CHANGED, self)          """
278    
279            if clazz is None:
280                self.__classification = classification.Classification()
281            else:
282    
283                # prevent infinite recursion when calling SetLayer()
284                if clazz == self.__classification:
285                    return
286    
287                self.__classification = clazz
288                self.__classification.SetLayer(self)
289    
     def SetStrokeWidth(self, width):  
         """Set the layer's stroke width."""  
         self.stroke_width = width  
290          self.changed(LAYER_LEGEND_CHANGED, self)          self.changed(LAYER_LEGEND_CHANGED, self)
291    
292        def ClassChanged(self):
293            """Called from the classification object when it has changed."""
294            self.changed(LAYER_LEGEND_CHANGED, self)
295    
296      def TreeInfo(self):      def TreeInfo(self):
297          items = []          items = []
298    
299          if self.Visible():          if self.Visible():
300              items.append("Shown")              items.append(_("Shown"))
301          else:          else:
302              items.append("Hidden")              items.append(_("Hidden"))
303          items.append("Shapes: %d" % self.NumShapes())          items.append(_("Shapes: %d") % self.NumShapes())
304    
305          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
306          if bbox is not None:          if bbox is not None:
307              items.append("Extent (lat-lon): (%g, %g, %g, %g)" % bbox)              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
308          else:          else:
309              items.append("Extent (lat-lon):")              items.append(_("Extent (lat-lon):"))
310          items.append("Shapetype: %s" % shapetype_names[self.ShapeType()])          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
311    
312            items.append(self.__classification)
313    
314          def color_string(color):          return (_("Layer '%s'") % self.Title(), items)
             if color is None:  
                 return "None"  
             return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue)  
         items.append("Fill: " + color_string(self.fill))  
         items.append("Outline: " + color_string(self.stroke))  
315    
         return ("Layer '%s'" % self.Title(), items)  
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