/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 701 by bh, Thu Apr 17 16:18:48 2003 UTC revision 1338 by jonathan, Tue Jul 1 16:10:00 2003 UTC
# 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    import warnings
13    
14  from Thuban import _  from Thuban import _
   
15  import shapelib, shptree  import shapelib, shptree
16    
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
18       LAYER_CHANGED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED
   
 from color import Color  
19    
20  import classification  import classification
21    
22  from table import Table  from color import Transparent, Black
   
23  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
24    
25    import resource
26    
27    
28  class Shape:  class Shape:
29    
30      """Represent one shape"""      """Represent one shape"""
# Line 33  class Shape: Line 32  class Shape:
32      def __init__(self, points):      def __init__(self, points):
33          self.points = points          self.points = points
34          #self.compute_bbox()          #self.compute_bbox()
35            self.bbox = None
36    
37      def compute_bbox(self):      def compute_bbox(self):
38            if self.bbox is not None:
39                return self.bbox
40    
41          xs = []          xs = []
42          ys = []          ys = []
43          for x, y in self.points:          for x, y in self.points:
# Line 45  class Shape: Line 48  class Shape:
48          self.urx = max(xs)          self.urx = max(xs)
49          self.ury = max(ys)          self.ury = max(ys)
50    
51            self.bbox = (self.llx, self.lly, self.urx, self.ury)
52    
53            return self.bbox
54    
55      def Points(self):      def Points(self):
56          return self.points          return self.points
57    
# Line 68  class BaseLayer(TitledObject, Modifiable Line 75  class BaseLayer(TitledObject, Modifiable
75    
76      """Base class for the layers."""      """Base class for the layers."""
77    
78      def __init__(self, title, visible = 1):      def __init__(self, title, visible = True, projection = None):
79          """Initialize the layer.          """Initialize the layer.
80    
81          title -- the title          title -- the title
# Line 77  class BaseLayer(TitledObject, Modifiable Line 84  class BaseLayer(TitledObject, Modifiable
84          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
85          Modifiable.__init__(self)          Modifiable.__init__(self)
86          self.visible = visible          self.visible = visible
87            self.projection = projection
88    
89      def Visible(self):      def Visible(self):
90          """Return true if layer is visible"""          """Return true if layer is visible"""
# Line 87  class BaseLayer(TitledObject, Modifiable Line 95  class BaseLayer(TitledObject, Modifiable
95          self.visible = visible          self.visible = visible
96          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
97    
98        def HasClassification(self):
99            """Determine if this layer support classifications."""
100            return False
101    
102        def HasShapes(self):
103            """Determine if this layer supports shapes."""
104            return False
105    
106        def GetProjection(self):
107            """Return the layer's projection."""
108            return self.projection
109    
110        def SetProjection(self, projection):
111            """Set the layer's projection"""
112            self.projection = projection
113            self.changed(LAYER_PROJECTION_CHANGED, self)
114    
115  class Layer(BaseLayer):  class Layer(BaseLayer):
116    
# Line 95  class Layer(BaseLayer): Line 119  class Layer(BaseLayer):
119      All children of the layer have the same type.      All children of the layer have the same type.
120    
121      A layer has fill and stroke colors. Colors should be instances of      A layer has fill and stroke colors. Colors should be instances of
122      Color. They can also be None, indicating no fill or no stroke.      Color. They can also be Transparent, indicating no fill or no stroke.
123    
124      The layer objects send the following events, all of which have the      The layer objects send the following events, all of which have the
125      layer object as parameter:      layer object as parameter:
# Line 104  class Layer(BaseLayer): Line 128  class Layer(BaseLayer):
128          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
129      """      """
130    
131      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
132                   fill = Color.Transparent,                   fill = Transparent,
133                   stroke = Color.Black,                   stroke = Black,
134                   lineWidth = 1,                   lineWidth = 1,
135                   visible = 1):                   visible = True):
136          """Initialize the layer.          """Initialize the layer.
137    
138          title -- the title          title -- the title
139          filename -- the name of the shapefile          data -- datastore object for the shape data shown by the layer
140          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
141                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
142                 coordinates                 coordinates
143          fill -- the fill color or Color.Transparent if the shapes are          fill -- the fill color or Transparent if the shapes are
144                  not filled                  not filled
145          stroke -- the stroke color or Color.Transparent if the shapes          stroke -- the stroke color or Transparent if the shapes
146                  are not stroked                  are not stroked
147          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
148    
149          colors are expected to be instances of Color class          colors are expected to be instances of Color class
150          """          """
151          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title,
152                                     visible = visible,
153          # Make the filename absolute. The filename will be                                   projection = projection)
         # 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)  
   
         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  
154    
155          #          #
156          # this is really important so that when the classification class          # this is really important so that when the classification class
157          # tries to set its parent layer the variable will exist          # tries to set its parent layer the variable will exist
158          #          #
159          self.__classification = None          self.__classification = None
         self.__setClassLock = False  
160    
161            self.SetShapeStore(data)
162    
163          self.SetClassification(None)          self.SetClassification(None)
164    
165          self.__classification.SetDefaultLineColor(stroke)          self.__classification.SetDefaultLineColor(stroke)
166          self.__classification.SetDefaultLineWidth(lineWidth)          self.__classification.SetDefaultLineWidth(lineWidth)
167          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
         self.__classification.SetLayer(self)  
168    
169          self.UnsetModified()          self.UnsetModified()
170    
171      def open_shapefile(self):      def __getattr__(self, attr):
172          if self.shapefile is None:          """Access to some attributes for backwards compatibility
             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  
173    
174              # estimate a good depth for the quad tree. Each depth          The attributes implemented here are now held by the shapestore
175              # multiplies the number of nodes by four, therefore we          if at all. For backwards compatibility pretend that they are
176              # basically take the base 4 logarithm of the number of          still there but issue a DeprecationWarning when they are
177              # shapes.          accessed.
178              if self.numshapes < 4:          """
179                  maxdepth = 1          if attr in ("table", "shapetable"):
180              else:              value = self.store.Table()
181                  maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))          elif attr == "shapefile":
182                value = self.store.Shapefile()
183            elif attr == "filename":
184                value = self.store.FileName()
185            else:
186                raise AttributeError, attr
187            warnings.warn("The Layer attribute %r is deprecated."
188                          " It's value can be accessed through the shapestore"
189                          % attr, DeprecationWarning, stacklevel = 2)
190            return value
191    
192        def SetShapeStore(self, store):
193            self.store = store
194            shapefile = self.store.Shapefile()
195    
196            numshapes, shapetype, mins, maxs = shapefile.info()
197            self.numshapes = numshapes
198            self.shapetype = shapelib_shapetypes[shapetype]
199    
200            # if there are shapes, set the bbox accordingly. Otherwise
201            # set it to None.
202            if self.numshapes:
203                self.bbox = mins[:2] + maxs[:2]
204            else:
205                self.bbox = None
206    
207              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,          # estimate a good depth for the quad tree. Each depth
208                                               maxdepth)          # multiplies the number of nodes by four, therefore we
209            # basically take the base 4 logarithm of the number of
210            # shapes.
211            if self.numshapes < 4:
212                maxdepth = 1
213            else:
214                maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
215    
216            self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,
217                                             maxdepth)
218            # Set the classification to None if there is a classification
219            # and the new shapestore doesn't have a table with a suitable
220            # column, i.e one with the same name and type as before
221            # FIXME: Maybe we should keep it the same if the type is
222            # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
223            if self.__classification is not None:
224                fieldname = self.__classification.GetField()
225                fieldtype = self.__classification.GetFieldType()
226                table = self.store.Table()
227                if (fieldname is not None
228                    and (not table.HasColumn(fieldname)
229                         or table.Column(fieldname).type != fieldtype)):
230                    self.SetClassification(None)
231            self.changed(LAYER_SHAPESTORE_REPLACED, self)
232    
233        def ShapeStore(self):
234            return self.store
235    
236      def Destroy(self):      def Destroy(self):
237          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
238          if self.shapefile is not None:          self.GetClassification()._set_layer(None)
             self.shapefile.close()  
             self.shapefile = None  
             self.shapetree = None  
         self.SetClassification(None)  
         self.table.Destroy()  
239    
240      def BoundingBox(self):      def BoundingBox(self):
241          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
# Line 216  class Layer(BaseLayer): Line 259  class Layer(BaseLayer):
259          else:          else:
260              return None              return None
261    
262      def GetFieldType(self, fieldName):      def ShapesBoundingBox(self, shapes):
263          info = self.table.field_info_by_name(fieldName)          """Return a bounding box in lat/long coordinates for the given
264          if info is not None:          list of shape ids.
265              return info[0]  
266            If shapes is None or empty, return None.
267            """
268    
269            if shapes is None or len(shapes) == 0: return None
270    
271            llx = []
272            lly = []
273            urx = []
274            ury = []
275    
276            if self.projection is not None:
277                inverse = lambda x, y: self.projection.Inverse(x, y)
278          else:          else:
279              return None              inverse = lambda x, y: (x, y)
280    
281            for id in shapes:
282                left, bottom, right, top = self.Shape(id).compute_bbox()
283    
284                left, bottom = inverse(left, bottom)
285                right, top   = inverse(right, top)
286    
287                llx.append(left)
288                lly.append(bottom)
289                urx.append(right)
290                ury.append(top)
291    
292            return (min(llx), min(lly), max(urx), max(ury))
293    
294        def GetFieldType(self, fieldName):
295            table = self.store.Table()
296            if table.HasColumn(fieldName):
297                return table.Column(fieldName).type
298            return None
299    
300        def HasShapes(self):
301            return True
302    
303      def NumShapes(self):      def NumShapes(self):
304          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
# Line 235  class Layer(BaseLayer): Line 312  class Layer(BaseLayer):
312    
313      def Shape(self, index):      def Shape(self, index):
314          """Return the shape with index index"""          """Return the shape with index index"""
315          shape = self.shapefile.read_object(index)          shape = self.store.Shapefile().read_object(index)
316    
317          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
318              points = shape.vertices()              points = shape.vertices()
# Line 251  class Layer(BaseLayer): Line 328  class Layer(BaseLayer):
328      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
329          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
330    
331          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.  
332          """          """
333          left, bottom, right, top = box          left, bottom, right, top = box
334    
335            if self.projection is not None:
336                left,  bottom = self.projection.Forward(left, bottom)
337                right, top    = self.projection.Forward(right, top)
338    
339          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
340    
341      def SetProjection(self, projection):      def HasClassification(self):
342          """Set the layer's projection"""          return True
         self.projection = projection  
         self.changed(LAYER_PROJECTION_CHANGED, self)  
343    
344      def GetClassification(self):      def GetClassification(self):
345          return self.__classification          return self.__classification
346    
347      def SetClassification(self, clazz):      def SetClassification(self, clazz):
348          """Set the classification to 'clazz'          """Set the classification used by this layer to 'clazz'
349    
350          If 'clazz' is None a default classification is created          If 'clazz' is None a default classification is created.
         """  
351    
352          # prevent infinite recursion when calling SetLayer()          ValueError is raised if the classification's field name
353          if self.__setClassLock: return          and type are different (if they aren't None) than what
354            is in the shapestore. The Layer will not be changed in
355            this case.
356            """
357    
358          self.__setClassLock = True          old_class = self.__classification
359    
360          if clazz is None:          if clazz is None:
361              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  
362    
363          self.changed(LAYER_CHANGED, self)          try:
364                clazz._set_layer(self)
365    
366          self.__setClassLock = False              # only change things after a successful call
367                if old_class is not None:
368                    old_class._set_layer(None)
369                self.__classification = clazz
370            except ValueError:
371                raise ValueError
372    
373            # we don't need this since a message will be sent
374            # after calling _set_layer()
375            #self.changed(LAYER_CHANGED, self)
376    
377      def ClassChanged(self):      def ClassChanged(self):
378          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
# Line 299  class Layer(BaseLayer): Line 381  class Layer(BaseLayer):
381      def TreeInfo(self):      def TreeInfo(self):
382          items = []          items = []
383    
384            items.append(_("Filename: %s") % self.ShapeStore().FileName())
385    
386          if self.Visible():          if self.Visible():
387              items.append(_("Shown"))              items.append(_("Shown"))
388          else:          else:
# Line 312  class Layer(BaseLayer): Line 396  class Layer(BaseLayer):
396              items.append(_("Extent (lat-lon):"))              items.append(_("Extent (lat-lon):"))
397          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
398    
399            if self.projection and len(self.projection.params) > 0:
400                items.append((_("Projection"),
401                            [str(param) for param in self.projection.params]))
402    
403          items.append(self.__classification)          items.append(self.__classification)
404    
405          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
406    
407    
408    if resource.has_gdal_support():
409        import gdal
410        from gdalconst import GA_ReadOnly
411    
412    class RasterLayer(BaseLayer):
413    
414        def __init__(self, title, filename, projection = None, visible = True):
415            """Initialize the Raster Layer.
416    
417            title -- title for the layer.
418    
419            filename -- file name of the source image.
420    
421            projection -- Projection object describing the projection which
422                          the source image is in.
423    
424            visible -- True is the layer should initially be visible.
425    
426            Throws IOError if the filename is invalid or points to a file that
427            is not in a format GDAL can use.
428            """
429    
430            BaseLayer.__init__(self, title, visible = visible)
431    
432            self.projection = projection
433            self.filename = filename
434    
435            self.bbox = -1
436    
437            if resource.has_gdal_support():
438                #
439                # temporarily open the file so that GDAL can test if it's valid.
440                #
441                dataset = gdal.Open(self.filename, GA_ReadOnly)
442    
443                if dataset is None:
444                    raise IOError()
445    
446            self.UnsetModified()
447    
448        def BoundingBox(self):
449            """Return the layer's bounding box in the intrinsic coordinate system.
450    
451            If the there is no support for images, or the file cannot
452            be read, or there is no geographics information available, return None.
453            """
454            if not resource.has_gdal_support():
455                return None
456    
457            if self.bbox == -1:
458                dataset = gdal.Open(self.filename, GA_ReadOnly)
459                if dataset is None:
460                    self.bbox = None
461                else:
462                    geotransform = dataset.GetGeoTransform()
463                    if geotransform is None:
464                        return None
465    
466                    x = 0
467                    y = dataset.RasterYSize
468                    left = geotransform[0] +        \
469                           geotransform[1] * x +    \
470                           geotransform[2] * y
471    
472                    bottom = geotransform[3] +      \
473                             geotransform[4] * x +  \
474                             geotransform[5] * y
475    
476                    x = dataset.RasterXSize
477                    y = 0
478                    right = geotransform[0] +       \
479                            geotransform[1] * x +   \
480                            geotransform[2] * y
481    
482                    top = geotransform[3] +         \
483                          geotransform[4] * x +     \
484                          geotransform[5] * y
485    
486                    self.bbox = (left, bottom, right, top)
487    
488            return self.bbox
489    
490        def LatLongBoundingBox(self):
491            bbox = self.BoundingBox()
492            if bbox is None:
493                return None
494    
495            llx, lly, urx, ury = bbox
496            if self.projection is not None:
497                llx, lly = self.projection.Inverse(llx, lly)
498                urx, ury = self.projection.Inverse(urx, ury)
499    
500            return llx, lly, urx, ury
501    
502        def GetImageFilename(self):
503            return self.filename
504    
505        def TreeInfo(self):
506            items = []
507    
508            items.append(_("Filename: %s") % self.GetImageFilename())
509    
510            if self.Visible():
511                items.append(_("Shown"))
512            else:
513                items.append(_("Hidden"))
514    
515            bbox = self.LatLongBoundingBox()
516            if bbox is not None:
517                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
518            else:
519                items.append(_("Extent (lat-lon):"))
520    
521            if self.projection and len(self.projection.params) > 0:
522                items.append((_("Projection"),
523                            [str(param) for param in self.projection.params]))
524    
525            return (_("Layer '%s'") % self.Title(), items)
526    
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