/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 558 by jonathan, Wed Mar 26 11:05:20 2003 UTC revision 794 by jonathan, Wed Apr 30 17:00:52 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]>  # Jonathan Coles <[email protected]>
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
 import os  
11  from math import log, ceil  from math import log, ceil
12    
13  from Thuban import _  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       LAYER_CHANGED
19    
20  from color import Color  from color import Color
21    
22  import classification  import classification
23    
 from table import Table  
   
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 68  class BaseLayer(TitledObject, Modifiable Line 66  class BaseLayer(TitledObject, Modifiable
66    
67      """Base class for the layers."""      """Base class for the layers."""
68    
69      def __init__(self, title, visible = 1):      def __init__(self, title, visible = True):
70          """Initialize the layer.          """Initialize the layer.
71    
72          title -- the title          title -- the title
# Line 102  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 = Color.None,                   fill = Color.Transparent,
107                   stroke = Color.Black,                   stroke = Color.Black,
108                   lineWidth = 1,                   lineWidth = 1,
109                   visible = 1):                   visible = True):
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 Color.None if the shapes are not filled          fill -- the fill color or Color.Transparent if the shapes are
118          stroke -- the stroke color or Color.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    
         # Make the filename absolute. The filename will be  
         # interpreted relative to that anyway, but when saving a  
         # session we need to compare absolute paths and it's usually  
         # safer to always work with absolute paths.  
         self.filename = os.path.abspath(filename)  
   
127          self.projection = projection          self.projection = projection
         self.shapefile = None  
         self.shapetree = None  
         self.open_shapefile()  
         # shapetable is the table associated with the shapefile, while  
         # table is the default table used to look up attributes for  
         # display  
         self.shapetable = Table(filename)  
         self.table = self.shapetable  
128    
129          #          #
130          # this is really important so that when the classification class          # this is really important so that when the classification class
131          # tries to set its parent layer the variable will exist          # tries to set its parent layer the variable will exist
132          #          #
133          self.__classification = None          self.__classification = None
134          self.__setClassLock = False          self.__setClassLock = False
135    
136            self.SetShapeStore(data)
137    
138          self.SetClassification(None)          self.SetClassification(None)
139    
# Line 159  class Layer(BaseLayer): Line 144  class Layer(BaseLayer):
144    
145          self.UnsetModified()          self.UnsetModified()
146    
     def open_shapefile(self):  
         if self.shapefile is None:  
             self.shapefile = shapelib.ShapeFile(self.filename)  
             numshapes, shapetype, mins, maxs = self.shapefile.info()  
             self.numshapes = numshapes  
             self.shapetype = shapelib_shapetypes[shapetype]  
   
             # if there are shapes, set the bbox accordinly. Otherwise  
             # set it to None.  
             if self.numshapes:  
                 self.bbox = mins[:2] + maxs[:2]  
             else:  
                 self.bbox = None  
   
             # estimate a good depth for the quad tree. Each depth  
             # multiplies the number of nodes by four, therefore we  
             # basically take the base 4 logarithm of the number of  
             # shapes.  
             if self.numshapes < 4:  
                 maxdepth = 1  
             else:  
                 maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))  
147    
148              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,      def SetShapeStore(self, store):
149                                               maxdepth)          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
154    
155            numshapes, shapetype, mins, maxs = self.shapefile.info()
156            self.numshapes = numshapes
157            self.shapetype = shapelib_shapetypes[shapetype]
158    
159            # if there are shapes, set the bbox accordingly. Otherwise
160            # set it to None.
161            if self.numshapes:
162                self.bbox = mins[:2] + maxs[:2]
163            else:
164                self.bbox = None
165    
166            # estimate a good depth for the quad tree. Each depth
167            # multiplies the number of nodes by four, therefore we
168            # basically take the base 4 logarithm of the number of
169            # shapes.
170            if self.numshapes < 4:
171                maxdepth = 1
172            else:
173                maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
174    
175            self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
176                                             maxdepth)
177            if self.__classification is not None:
178                fieldname = self.__classification.GetField()
179                if fieldname is not None and \
180                   not self.store.Table().field_info_by_name(fieldname):
181                    self.SetClassification(None)
182            self.changed(LAYER_CHANGED, self)
183    
184        def ShapeStore(self):
185            return self.store
186    
187      def Destroy(self):      def Destroy(self):
188          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
         if self.shapefile is not None:  
             self.shapefile.close()  
             self.shapefile = None  
             self.shapetree = None  
189          self.SetClassification(None)          self.SetClassification(None)
         self.table.Destroy()  
190    
191      def BoundingBox(self):      def BoundingBox(self):
192          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
193    
194          If the layer has no shapes, return None.          If the layer has no shapes, return None.
195          """          """
         # The bbox will be set by open_shapefile just as we need it  
         # here.  
         self.open_shapefile()  
196          return self.bbox          return self.bbox
197    
198      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
# Line 220  class Layer(BaseLayer): Line 211  class Layer(BaseLayer):
211              return None              return None
212    
213      def GetFieldType(self, fieldName):      def GetFieldType(self, fieldName):
         self.open_shapefile()  
214          info = self.table.field_info_by_name(fieldName)          info = self.table.field_info_by_name(fieldName)
215          if info is not None:          if info is not None:
216              return info[0]              return info[0]
# Line 229  class Layer(BaseLayer): Line 219  class Layer(BaseLayer):
219    
220      def NumShapes(self):      def NumShapes(self):
221          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
222          return self.numshapes          return self.numshapes
223    
224      def ShapeType(self):      def ShapeType(self):
225          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
226          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
227          """          """
         self.open_shapefile()  
228          return self.shapetype          return self.shapetype
229    
230      def Shape(self, index):      def Shape(self, index):
231          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
232          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
233    
234          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
# Line 258  class Layer(BaseLayer): Line 245  class Layer(BaseLayer):
245      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
246          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
247    
248          Box is a tuple (left, bottom, right, top) in the coordinate          Box is a tuple (left, bottom, right, top) in unprojected coordinates.
         system used by the layer's shapefile.  
249          """          """
250          left, bottom, right, top = box          left, bottom, right, top = box
251    
252            if self.projection is not None:
253                left,  bottom = self.projection.Forward(left, bottom)
254                right, top    = self.projection.Forward(right, top)
255    
256          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
257    
258        def GetProjection(self):
259            return self.projection
260    
261      def SetProjection(self, projection):      def SetProjection(self, projection):
262          """Set the layer's projection"""          """Set the layer's projection"""
263          self.projection = projection          self.projection = projection
# Line 319  class Layer(BaseLayer): Line 313  class Layer(BaseLayer):
313              items.append(_("Extent (lat-lon):"))              items.append(_("Extent (lat-lon):"))
314          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
315    
316            if self.projection and len(self.projection.params) > 0:
317                items.append((_("Projection"),
318                            [str(param) for param in self.projection.params]))
319    
320          items.append(self.__classification)          items.append(self.__classification)
321    
322          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
323    
324    
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