/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 1158 by jonathan, Thu Jun 12 12:40:11 2003 UTC revision 1535 by bh, Fri Aug 1 14:27:13 2003 UTC
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
11  from math import log, ceil  import warnings
12    
13  from Thuban import _  from Thuban import _
 import shapelib, shptree  
14    
15  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
16       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
17    
18  import classification  import classification
19    
20  from color import Color  from color import Transparent, Black
21  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
22    from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT, Shape
23    
24  import resource  import resource
25    
26    
 class Shape:  
   
     """Represent one shape"""  
   
     def __init__(self, points):  
         self.points = points  
         #self.compute_bbox()  
         self.bbox = None  
   
     def compute_bbox(self):  
         if self.bbox is not None:  
             return self.bbox  
   
         xs = []  
         ys = []  
         for x, y in self.points:  
             xs.append(x)  
             ys.append(y)  
         self.llx = min(xs)  
         self.lly = min(ys)  
         self.urx = max(xs)  
         self.ury = max(ys)  
   
         self.bbox = (self.llx, self.lly, self.urx, self.ury)  
   
         return self.bbox  
   
     def Points(self):  
         return self.points  
   
   
   
 # Shape type constants  
 SHAPETYPE_POLYGON = "polygon"  
 SHAPETYPE_ARC = "arc"  
 SHAPETYPE_POINT = "point"  
   
 # mapping from shapelib shapetype constants to our constants  
 shapelib_shapetypes = {shapelib.SHPT_POLYGON: SHAPETYPE_POLYGON,  
                        shapelib.SHPT_ARC: SHAPETYPE_ARC,  
                        shapelib.SHPT_POINT: SHAPETYPE_POINT}  
   
27  shapetype_names = {SHAPETYPE_POINT: "Point",  shapetype_names = {SHAPETYPE_POINT: "Point",
28                     SHAPETYPE_ARC: "Arc",                     SHAPETYPE_ARC: "Arc",
29                     SHAPETYPE_POLYGON: "Polygon"}                     SHAPETYPE_POLYGON: "Polygon"}
# Line 98  class BaseLayer(TitledObject, Modifiable Line 56  class BaseLayer(TitledObject, Modifiable
56          """Determine if this layer support classifications."""          """Determine if this layer support classifications."""
57          return False          return False
58    
59        def HasShapes(self):
60            """Determine if this layer supports shapes."""
61            return False
62    
63      def GetProjection(self):      def GetProjection(self):
64          """Return the layer's projection."""          """Return the layer's projection."""
65          return self.projection          return self.projection
# Line 114  class Layer(BaseLayer): Line 76  class Layer(BaseLayer):
76      All children of the layer have the same type.      All children of the layer have the same type.
77    
78      A layer has fill and stroke colors. Colors should be instances of      A layer has fill and stroke colors. Colors should be instances of
79      Color. They can also be None, indicating no fill or no stroke.      Color. They can also be Transparent, indicating no fill or no stroke.
80    
81      The layer objects send the following events, all of which have the      The layer objects send the following events, all of which have the
82      layer object as parameter:      layer object as parameter:
# Line 124  class Layer(BaseLayer): Line 86  class Layer(BaseLayer):
86      """      """
87    
88      def __init__(self, title, data, projection = None,      def __init__(self, title, data, projection = None,
89                   fill = Color.Transparent,                   fill = Transparent,
90                   stroke = Color.Black,                   stroke = Black,
91                   lineWidth = 1,                   lineWidth = 1,
92                   visible = True):                   visible = True):
93          """Initialize the layer.          """Initialize the layer.
# Line 135  class Layer(BaseLayer): Line 97  class Layer(BaseLayer):
97          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
98                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
99                 coordinates                 coordinates
100          fill -- the fill color or Color.Transparent if the shapes are          fill -- the fill color or Transparent if the shapes are
101                  not filled                  not filled
102          stroke -- the stroke color or Color.Transparent if the shapes          stroke -- the stroke color or Transparent if the shapes
103                  are not stroked                  are not stroked
104          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
105    
# Line 147  class Layer(BaseLayer): Line 109  class Layer(BaseLayer):
109                                   visible = visible,                                   visible = visible,
110                                   projection = projection)                                   projection = projection)
111    
         #  
         # this is really important so that when the classification class  
         # tries to set its parent layer the variable will exist  
         #  
112          self.__classification = None          self.__classification = None
113          self.__setClassLock = False          self.store = None
114    
115          self.SetShapeStore(data)          self.SetShapeStore(data)
116    
117            self.classification_column = None
118            self.SetClassificationColumn(None)
119          self.SetClassification(None)          self.SetClassification(None)
120    
121          self.__classification.SetDefaultLineColor(stroke)          self.__classification.SetDefaultLineColor(stroke)
122          self.__classification.SetDefaultLineWidth(lineWidth)          self.__classification.SetDefaultLineWidth(lineWidth)
123          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
         self.__classification.SetLayer(self)  
124    
125          self.UnsetModified()          self.UnsetModified()
126    
127        def __getattr__(self, attr):
128            """Access to some attributes for backwards compatibility
129    
130      def SetShapeStore(self, store):          The attributes implemented here are now held by the shapestore
131          self.store = store          if at all. For backwards compatibility pretend that they are
132          self.shapefile = self.store.Shapefile()          still there but issue a DeprecationWarning when they are
133          self.shapetable = self.store.Table()          accessed.
134          if hasattr(self.store, "FileName"):          """
135              self.filename = self.store.FileName()          if attr in ("table", "shapetable"):
136          self.table = self.shapetable              value = self.store.Table()
137            elif attr == "shapefile":
138          numshapes, shapetype, mins, maxs = self.shapefile.info()              value = self.store.Shapefile()
139          self.numshapes = numshapes          elif attr == "filename":
140          self.shapetype = shapelib_shapetypes[shapetype]              value = self.store.FileName()
   
         # if there are shapes, set the bbox accordingly. 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  
141          else:          else:
142              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))              raise AttributeError, attr
143            warnings.warn("The Layer attribute %r is deprecated."
144                          " It's value can be accessed through the shapestore"
145                          % attr, DeprecationWarning, stacklevel = 2)
146            return value
147    
148          self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,      def SetShapeStore(self, store):
                                          maxdepth)  
149          # Set the classification to None if there is a classification          # Set the classification to None if there is a classification
150          # and the new shapestore doesn't have a table with a suitable          # and the new shapestore doesn't have a table with a suitable
151          # column, i.e one with the same name and type as before          # column, i.e one with the same name and type as before
152          # FIXME: Maybe we should keep it the same if the type is          # FIXME: Maybe we should keep it the same if the type is
153          # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT          # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
154          if self.__classification is not None:          if self.__classification is not None:
155              fieldname = self.__classification.GetField()              columnname = self.classification_column
156              fieldtype = self.__classification.GetFieldType()              columntype = self.GetFieldType(columnname)
157              table = self.store.Table()              table = store.Table()
158              if (fieldname is not None              if (columnname is not None
159                  and (not table.HasColumn(fieldname)                  and (not table.HasColumn(columnname)
160                       or table.Column(fieldname).type != fieldtype)):                       or table.Column(columnname).type != columntype)):
161                  self.SetClassification(None)                  self.SetClassification(None)
162    
163            self.store = store
164    
165          self.changed(LAYER_SHAPESTORE_REPLACED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
166    
167      def ShapeStore(self):      def ShapeStore(self):
# Line 216  class Layer(BaseLayer): Line 169  class Layer(BaseLayer):
169    
170      def Destroy(self):      def Destroy(self):
171          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
172          self.SetClassification(None)          if self.__classification is not None:
173          self.store = self.shapetree = None              self.__classification.Unsubscribe(CLASS_CHANGED,
174          self.table = self.shapefile = self.shapetable = None                                                self._classification_changed)
175    
176      def BoundingBox(self):      def BoundingBox(self):
177          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
178    
179          If the layer has no shapes, return None.          If the layer has no shapes, return None.
180          """          """
181          return self.bbox          return self.store.BoundingBox()
182    
183      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
184          """Return the layer's bounding box in lat/long coordinates.          """Return the layer's bounding box in lat/long coordinates.
# Line 275  class Layer(BaseLayer): Line 228  class Layer(BaseLayer):
228          return (min(llx), min(lly), max(urx), max(ury))          return (min(llx), min(lly), max(urx), max(ury))
229    
230      def GetFieldType(self, fieldName):      def GetFieldType(self, fieldName):
231          if self.table.HasColumn(fieldName):          if self.store:
232              return self.table.Column(fieldName).type              table = self.store.Table()
233                if table.HasColumn(fieldName):
234                    return table.Column(fieldName).type
235          return None          return None
236    
237        def HasShapes(self):
238            return True
239    
240      def NumShapes(self):      def NumShapes(self):
241          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
242          return self.numshapes          return self.store.NumShapes()
243    
244      def ShapeType(self):      def ShapeType(self):
245          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
246          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.  
247            The return value is one of the SHAPETYPE_* constants defined in
248            Thuban.Model.data.
249          """          """
250          return self.shapetype          return self.store.ShapeType()
251    
252      def Shape(self, index):      def Shape(self, index):
253          """Return the shape with index index"""          """Return the shape with index index"""
254          shape = self.shapefile.read_object(index)          return self.store.Shape(index)
   
         if self.shapetype == SHAPETYPE_POINT:  
             points = shape.vertices()  
         else:  
             #for poly in shape.vertices():  
             poly = shape.vertices()[0]  
             points = []  
             for x, y in poly:  
                 points.append((x, y))  
   
         return Shape(points)  
255    
256      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
257          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
# Line 315  class Layer(BaseLayer): Line 264  class Layer(BaseLayer):
264              left,  bottom = self.projection.Forward(left, bottom)              left,  bottom = self.projection.Forward(left, bottom)
265              right, top    = self.projection.Forward(right, top)              right, top    = self.projection.Forward(right, top)
266    
267          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.store.ShapesInRegion((left, bottom, right, top))
268    
269        def GetClassificationColumn(self):
270            return self.classification_column
271    
272        def SetClassificationColumn(self, column):
273            """Set the column to classifiy on, or None. If column is not None
274            and the column does not exist in the table, raise a ValueError.
275            """
276            if column:
277                columnType = self.GetFieldType(column)
278                if columnType is None:
279                    raise ValueError()
280            changed = self.classification_column != column
281            self.classification_column = column
282            if changed:
283                self.changed(LAYER_CHANGED, self)
284    
285      def HasClassification(self):      def HasClassification(self):
286          return True          return True
# Line 324  class Layer(BaseLayer): Line 289  class Layer(BaseLayer):
289          return self.__classification          return self.__classification
290    
291      def SetClassification(self, clazz):      def SetClassification(self, clazz):
292          """Set the classification to 'clazz'          """Set the classification used by this layer to 'clazz'
293    
294          If 'clazz' is None a default classification is created          If 'clazz' is None a default classification is created.
         """  
295    
296          # prevent infinite recursion when calling SetLayer()          This issues a LAYER_CHANGED event.
297          if self.__setClassLock: return          """
298    
299          self.__setClassLock = True          if self.__classification is not None:
300                self.__classification.Unsubscribe(CLASS_CHANGED,
301                                                  self._classification_changed)
302    
303          if clazz is None:          if clazz is None:
304              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  
305    
306          self.changed(LAYER_CHANGED, self)          self.__classification = clazz
307            self.__classification.Subscribe(CLASS_CHANGED,
308                                            self._classification_changed)
309    
310          self.__setClassLock = False          self._classification_changed()
311    
312      def ClassChanged(self):      def _classification_changed(self):
313          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
314          self.changed(LAYER_CHANGED, self)          self.changed(LAYER_CHANGED, self)
315    
316      def TreeInfo(self):      def TreeInfo(self):
317          items = []          items = []
318    
319          if hasattr(self, 'filename'):          items.append(_("Filename: %s") % self.ShapeStore().FileName())
             items.append(_("Filename: %s") % self.filename)  
320    
321          if self.Visible():          if self.Visible():
322              items.append(_("Shown"))              items.append(_("Shown"))
# Line 425  class RasterLayer(BaseLayer): Line 383  class RasterLayer(BaseLayer):
383      def BoundingBox(self):      def BoundingBox(self):
384          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
385    
386          If the layer has no shapes, return None.          If the there is no support for images, or the file cannot
387            be read, or there is no geographics information available, return None.
388          """          """
389          if not resource.has_gdal_support():          if not resource.has_gdal_support():
390              return None              return None
# Line 481  class RasterLayer(BaseLayer): Line 440  class RasterLayer(BaseLayer):
440      def TreeInfo(self):      def TreeInfo(self):
441          items = []          items = []
442    
443            items.append(_("Filename: %s") % self.GetImageFilename())
444    
445          if self.Visible():          if self.Visible():
446              items.append(_("Shown"))              items.append(_("Shown"))
447          else:          else:
448              items.append(_("Hidden"))              items.append(_("Hidden"))
         items.append(_("Shapes: %d") % self.NumShapes())  
449    
450          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
451          if bbox is not None:          if bbox is not None:
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