/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/layer.py
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revision 961 by jonathan, Wed May 21 17:23:25 2003 UTC revision 2710 by dpinte, Tue Oct 10 08:31:44 2006 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003, 2004, 2005 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
5    # Silke Reimer <[email protected]>
6  #  #
7  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
8  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
9    
10  __version__ = "$Revision$"  __version__ = "$Revision$"
11    
12  from math import log, ceil  import os
13    import warnings
14    
15  from Thuban import _  from wxproj import point_in_polygon_shape, shape_centroid
   
 import shapelib, shptree  
16    
17  import gdal  from Thuban import _
 from gdalconst import GA_ReadOnly  
18    
19  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
20       LAYER_CHANGED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
   
 from color import Color  
21    
22  import classification  import classification
23    
24    from color import Transparent, Black
25  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
26    from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT
27    from label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \
28         ALIGN_LEFT, ALIGN_RIGHT
29    
30    import resource
31    
32  class Shape:  from color import Color
   
     """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}  
33    
34  shapetype_names = {SHAPETYPE_POINT: "Point",  shapetype_names = {SHAPETYPE_POINT: "Point",
35                     SHAPETYPE_ARC: "Arc",                     SHAPETYPE_ARC: "Arc",
# Line 98  class BaseLayer(TitledObject, Modifiable Line 60  class BaseLayer(TitledObject, Modifiable
60          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
61    
62      def HasClassification(self):      def HasClassification(self):
63          """Determine if this layer support classifications."""          """Determine if this layer supports classifications."""
64            return False
65    
66        def HasShapes(self):
67            """Determine if this layer supports shapes."""
68          return False          return False
69    
70      def GetProjection(self):      def GetProjection(self):
# Line 106  class BaseLayer(TitledObject, Modifiable Line 72  class BaseLayer(TitledObject, Modifiable
72          return self.projection          return self.projection
73    
74      def SetProjection(self, projection):      def SetProjection(self, projection):
75          """Set the layer's projection"""          """Set the layer's projection."""
76          self.projection = projection          self.projection = projection
77          self.changed(LAYER_PROJECTION_CHANGED, self)          self.changed(LAYER_PROJECTION_CHANGED, self)
78    
79        def Type(self):
80            return "Unknown"
81    
82  class Layer(BaseLayer):  class Layer(BaseLayer):
83    
84      """Represent the information of one geodata file (currently a shapefile)      """Represent the information of one geodata file (currently a shapefile)
# Line 117  class Layer(BaseLayer): Line 86  class Layer(BaseLayer):
86      All children of the layer have the same type.      All children of the layer have the same type.
87    
88      A layer has fill and stroke colors. Colors should be instances of      A layer has fill and stroke colors. Colors should be instances of
89      Color. They can also be None, indicating no fill or no stroke.      Color. They can also be Transparent, indicating no fill or no stroke.
90    
91      The layer objects send the following events, all of which have the      The layer objects send the following events, all of which have the
92      layer object as parameter:      layer object as parameter:
# Line 127  class Layer(BaseLayer): Line 96  class Layer(BaseLayer):
96      """      """
97    
98      def __init__(self, title, data, projection = None,      def __init__(self, title, data, projection = None,
99                   fill = Color.Transparent,                   fill = Transparent,
100                   stroke = Color.Black,                   stroke = Black,
101                   lineWidth = 1,                   lineWidth = 1,
102                   visible = True):                   visible = True):
103          """Initialize the layer.          """Initialize the layer.
# Line 138  class Layer(BaseLayer): Line 107  class Layer(BaseLayer):
107          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
108                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
109                 coordinates                 coordinates
110          fill -- the fill color or Color.Transparent if the shapes are          fill -- the fill color or Transparent if the shapes are
111                  not filled                  not filled
112          stroke -- the stroke color or Color.Transparent if the shapes          stroke -- the stroke color or Transparent if the shapes
113                  are not stroked                  are not stroked
114          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
115    
# Line 150  class Layer(BaseLayer): Line 119  class Layer(BaseLayer):
119                                   visible = visible,                                   visible = visible,
120                                   projection = projection)                                   projection = projection)
121    
         #  
         # this is really important so that when the classification class  
         # tries to set its parent layer the variable will exist  
         #  
122          self.__classification = None          self.__classification = None
123          self.__setClassLock = False          self.store = None
124    
125          self.SetShapeStore(data)          self.SetShapeStore(data)
126    
127            self.classification_column = None
128            self.SetClassificationColumn(None)
129          self.SetClassification(None)          self.SetClassification(None)
130    
131          self.__classification.SetDefaultLineColor(stroke)          self.__classification.SetDefaultLineColor(stroke)
132          self.__classification.SetDefaultLineWidth(lineWidth)          self.__classification.SetDefaultLineWidth(lineWidth)
133          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
         self.__classification.SetLayer(self)  
134    
135          self.UnsetModified()          self.UnsetModified()
136    
   
137      def SetShapeStore(self, store):      def SetShapeStore(self, store):
138          self.store = store          # Set the classification to None if there is a classification
139          self.shapefile = self.store.Shapefile()          # and the new shapestore doesn't have a table with a suitable
140          self.shapetable = self.store.Table()          # column, i.e one with the same name and type as before
141          self.filename = self.store.filename          # FIXME: Maybe we should keep it the same if the type is
142          self.table = self.shapetable          # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
   
         numshapes, shapetype, mins, maxs = self.shapefile.info()  
         self.numshapes = numshapes  
         self.shapetype = shapelib_shapetypes[shapetype]  
   
         # 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  
         else:  
             maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))  
   
         self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,  
                                          maxdepth)  
143          if self.__classification is not None:          if self.__classification is not None:
144              fieldname = self.__classification.GetField()              columnname = self.classification_column
145              if fieldname is not None and \              columntype = self.GetFieldType(columnname)
146                 not self.store.Table().HasColumn(fieldname):              table = store.Table()
147                if (columnname is not None
148                    and (not table.HasColumn(columnname)
149                         or table.Column(columnname).type != columntype)):
150                  self.SetClassification(None)                  self.SetClassification(None)
151          self.changed(LAYER_CHANGED, self)  
152            self.store = store
153    
154            self.changed(LAYER_SHAPESTORE_REPLACED, self)
155    
156      def ShapeStore(self):      def ShapeStore(self):
157          return self.store          return self.store
158    
159      def Destroy(self):      def Destroy(self):
160          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
161          self.SetClassification(None)          if self.__classification is not None:
162                self.__classification.Unsubscribe(CLASS_CHANGED,
163                                                  self._classification_changed)
164    
165      def BoundingBox(self):      def BoundingBox(self):
166          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
167    
168          If the layer has no shapes, return None.          If the layer has no shapes, return None.
169          """          """
170          return self.bbox          return self.store.BoundingBox()
171    
172      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
173          """Return the layer's bounding box in lat/long coordinates.          """Return the layer's bounding box in lat/long coordinates.
# Line 225  class Layer(BaseLayer): Line 175  class Layer(BaseLayer):
175          Return None, if the layer doesn't contain any shapes.          Return None, if the layer doesn't contain any shapes.
176          """          """
177          bbox = self.BoundingBox()          bbox = self.BoundingBox()
178          if bbox is not None:          if bbox is not None and self.projection is not None:
179              llx, lly, urx, ury = bbox              bbox = self.projection.InverseBBox(bbox)
180              if self.projection is not None:          return bbox
181                  llx, lly = self.projection.Inverse(llx, lly)  
182                  urx, ury = self.projection.Inverse(urx, ury)      def Type(self):
183              return llx, lly, urx, ury          return self.ShapeType();
         else:  
             return None  
184    
185      def ShapesBoundingBox(self, shapes):      def ShapesBoundingBox(self, shapes):
186          """Return a bounding box in lat/long coordinates for the given          """Return a bounding box in lat/long coordinates for the given
# Line 243  class Layer(BaseLayer): Line 191  class Layer(BaseLayer):
191    
192          if shapes is None or len(shapes) == 0: return None          if shapes is None or len(shapes) == 0: return None
193    
194          llx = []          xs = []
195          lly = []          ys = []
         urx = []  
         ury = []  
   
         if self.projection is not None:  
             inverse = lambda x, y: self.projection.Inverse(x, y)  
         else:  
             inverse = lambda x, y: (x, y)  
196    
197          for id in shapes:          for id in shapes:
198              left, bottom, right, top = self.Shape(id).compute_bbox()              bbox = self.Shape(id).compute_bbox()
199                if self.projection is not None:
200              left, bottom = inverse(left, bottom)                  bbox = self.projection.InverseBBox(bbox)
201              right, top   = inverse(right, top)              left, bottom, right, top = bbox
202                xs.append(left); xs.append(right)
203                ys.append(bottom); ys.append(top)
204    
205              llx.append(left)          return (min(xs), min(ys), max(xs), max(ys))
             lly.append(bottom)  
             urx.append(right)  
             ury.append(top)  
206    
         return (min(llx), min(lly), max(urx), max(ury))  
207    
208      def GetFieldType(self, fieldName):      def GetFieldType(self, fieldName):
209          if self.table.HasColumn(fieldName):          if self.store:
210              return self.table.Column(fieldName).type              table = self.store.Table()
211                if table.HasColumn(fieldName):
212                    return table.Column(fieldName).type
213          return None          return None
214    
215        def HasShapes(self):
216            return True
217    
218      def NumShapes(self):      def NumShapes(self):
219          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
220          return self.numshapes          return self.store.NumShapes()
221    
222      def ShapeType(self):      def ShapeType(self):
223          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
224          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.  
225            The return value is one of the SHAPETYPE_* constants defined in
226            Thuban.Model.data.
227          """          """
228          return self.shapetype          return self.store.ShapeType()
229    
230      def Shape(self, index):      def Shape(self, index):
231          """Return the shape with index index"""          """Return the shape with index index"""
232          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)  
233    
234      def ShapesInRegion(self, box):      def ShapesInRegion(self, bbox):
235          """Return the ids of the shapes that overlap the box.          """Return an iterable over the shapes that overlap the bounding box.
236    
237          Box is a tuple (left, bottom, right, top) in unprojected coordinates.          The bbox parameter should be the bounding box as a tuple in the
238            form (minx, miny, maxx, maxy) in unprojected coordinates.
239          """          """
         left, bottom, right, top = box  
   
240          if self.projection is not None:          if self.projection is not None:
241              left,  bottom = self.projection.Forward(left, bottom)              # Ensure that region lies within the layer's bounding box
242              right, top    = self.projection.Forward(right, top)              # Otherwise projection of the region would lead to incorrect
243                # values.
244          return self.shapetree.find_shapes((left, bottom), (right, top))              clipbbox = self.__mangle_bounding_box(bbox)
245                bbox = self.projection.ForwardBBox(clipbbox)
246            return self.store.ShapesInRegion(bbox)
247    
248        def GetClassificationColumn(self):
249            return self.classification_column
250    
251        def SetClassificationColumn(self, column):
252            """Set the column to classifiy on, or None. If column is not None
253            and the column does not exist in the table, raise a ValueError.
254            """
255            if column:
256                columnType = self.GetFieldType(column)
257                if columnType is None:
258                    raise ValueError()
259            changed = self.classification_column != column
260            self.classification_column = column
261            if changed:
262                self.changed(LAYER_CHANGED, self)
263    
264      def HasClassification(self):      def HasClassification(self):
265          return True          return True
# Line 316  class Layer(BaseLayer): Line 268  class Layer(BaseLayer):
268          return self.__classification          return self.__classification
269    
270      def SetClassification(self, clazz):      def SetClassification(self, clazz):
271          """Set the classification to 'clazz'          """Set the classification used by this layer to 'clazz'
272    
273          If 'clazz' is None a default classification is created          If 'clazz' is None a default classification is created.
         """  
274    
275          # prevent infinite recursion when calling SetLayer()          This issues a LAYER_CHANGED event.
276          if self.__setClassLock: return          """
277    
278          self.__setClassLock = True          if self.__classification is not None:
279                self.__classification.Unsubscribe(CLASS_CHANGED,
280                                                  self._classification_changed)
281    
282          if clazz is None:          if clazz is None:
283              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  
284    
285          self.changed(LAYER_CHANGED, self)          self.__classification = clazz
286            self.__classification.Subscribe(CLASS_CHANGED,
287                                            self._classification_changed)
288    
289          self.__setClassLock = False          self._classification_changed()
290    
291      def ClassChanged(self):      def _classification_changed(self):
292          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
293          self.changed(LAYER_CHANGED, self)          self.changed(LAYER_CHANGED, self)
294    
295      def TreeInfo(self):      def TreeInfo(self):
296          items = []          items = []
297    
298            items.append(_("Filename: %s") % self.ShapeStore().FileName())
299    
300          if self.Visible():          if self.Visible():
301              items.append(_("Shown"))              items.append(_("Shown"))
302          else:          else:
# Line 357  class Layer(BaseLayer): Line 305  class Layer(BaseLayer):
305    
306          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
307          if bbox is not None:          if bbox is not None:
308              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % tuple(bbox))
309          else:          else:
310              items.append(_("Extent (lat-lon):"))              items.append(_("Extent (lat-lon):"))
311          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
# Line 370  class Layer(BaseLayer): Line 318  class Layer(BaseLayer):
318    
319          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
320    
321        def __mangle_bounding_box(self, bbox):
322            # FIXME: This method doesn't make much sense.
323            # See RT #2845 which effectively says:
324            #
325            # If this method, which was originally called ClipBoundingBox,
326            # is supposed to do clipping it shouldn't return the parameter
327            # unchanged when it lies completely outside of the bounding box.
328            # It would be better to return None and return an empty list in
329            # ShapesInRegion (the only caller) in that case.
330            #
331            # This method was introduced to fix a bug that IIRC had
332            # something todo with projections and bounding boxes containing
333            # NaN or INF when the parameter to ShapesInRegion covered the
334            # entire earth or something similarly large).
335            bminx, bminy, bmaxx, bmaxy = bbox
336            lminx, lminy, lmaxx, lmaxy = self.LatLongBoundingBox()
337            if bminx > lmaxx or bmaxx < lminx:
338                left, right = bminx, bmaxx
339            else:
340                left = max(lminx, bminx)
341                right = min(lmaxx, bmaxx)
342            if bminy > lmaxy or bmaxy < lminy:
343                bottom, top = bminy, bmaxy
344            else:
345                bottom = max(lminy, bminy)
346                top = min(lmaxy, bmaxy)
347    
348            return (left, bottom, right, top)
349    
350        def GetLabelPosFromShape(self, cmap, shape_index):
351            '''
352            Return the label position parameters (x, y, halign, valign) from the
353            shape object
354            '''
355            proj = cmap.projection
356            if proj is not None:
357                map_proj = proj
358            else:
359                map_proj = None
360            proj = self.projection
361            if proj is not None:
362                layer_proj = proj
363            else:
364                layer_proj = None
365    
366            shapetype = self.ShapeType()
367            if shapetype == SHAPETYPE_POLYGON:
368                shapefile = self.ShapeStore().Shapefile().cobject()
369                x, y = shape_centroid(shapefile, shape_index,
370                                      map_proj, layer_proj, 1, 1, 0, 0)
371                if map_proj is not None:
372                    x, y = map_proj.Inverse(x, y)
373            else:
374                shape = self.Shape(shape_index)
375                if shapetype == SHAPETYPE_POINT:
376                    x, y = shape.Points()[0][0]
377                else:
378                    # assume SHAPETYPE_ARC
379                    points = shape.Points()[0]
380                    x, y = points[len(points) / 2]
381                if layer_proj is not None:
382                    x, y = layer_proj.Inverse(x, y)
383            if shapetype == SHAPETYPE_POINT:
384                halign = ALIGN_LEFT
385                valign = ALIGN_CENTER
386            elif shapetype == SHAPETYPE_POLYGON:
387                halign = ALIGN_CENTER
388                valign = ALIGN_CENTER
389            elif shapetype == SHAPETYPE_ARC:
390                halign = ALIGN_LEFT
391                valign = ALIGN_CENTER
392            
393            return (x, y, halign, valign)
394    
395    
396    
397    if resource.has_gdal_support():
398        import gdal
399        from gdalconst import GA_ReadOnly
400    
401  class RasterLayer(BaseLayer):  class RasterLayer(BaseLayer):
402    
403      def __init__(self, title, filename, projection = None, visible = True):      MASK_NONE  = 0
404        MASK_BIT   = 1
405        MASK_ALPHA = 2
406    
407        def __init__(self, title, filename, projection = None,
408                     visible = True, opacity = 1, masktype = MASK_BIT):
409          """Initialize the Raster Layer.          """Initialize the Raster Layer.
410    
411          title -- title for the layer.          title -- title for the layer.
# Line 392  class RasterLayer(BaseLayer): Line 424  class RasterLayer(BaseLayer):
424          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title, visible = visible)
425    
426          self.projection = projection          self.projection = projection
427          self.filename = filename          self.filename = os.path.abspath(filename)
428    
429          self.bbox = -1          self.bbox = -1
430    
431          #          self.mask_type = masktype
432          # temporarily open the file so that GDAL can test if it's valid.          self.opacity = opacity
433          #  
434          dataset = gdal.Open(self.filename, GA_ReadOnly)          self.image_info = None
435    
436          if dataset is None:          if resource.has_gdal_support():
437              raise IOError()              #
438                # temporarily open the file so that GDAL can test if it's valid.
439                #
440                dataset = gdal.Open(self.filename, GA_ReadOnly)
441    
442                if dataset is None:
443                    raise IOError()
444    
445                #
446                # while we have the file, extract some basic information
447                # that we can display later
448                #
449                self.image_info = {}
450    
451                self.image_info["nBands"] = dataset.RasterCount
452                self.image_info["Size"] = (dataset.RasterXSize, dataset.RasterYSize)
453                self.image_info["Driver"] = dataset.GetDriver().ShortName
454    
455                # store some information about the individual bands
456                # [min_value, max_value]
457                a = self.image_info["BandData"] = []
458    
459                for i in range(1, dataset.RasterCount+1):
460                    band = dataset.GetRasterBand(i)
461                    a.append(band.ComputeRasterMinMax())
462    
463          self.UnsetModified()          self.UnsetModified()
464    
465      def BoundingBox(self):      def BoundingBox(self):
466          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
467    
468          If the layer has no shapes, return None.          If the there is no support for images, or the file cannot
469            be read, or there is no geographics information available, return None.
470          """          """
471            if not resource.has_gdal_support():
472                return None
473    
474          if self.bbox == -1:          if self.bbox == -1:
475              dataset = gdal.Open(self.filename, GA_ReadOnly)              dataset = gdal.Open(self.filename, GA_ReadOnly)
476              if dataset is None:              if dataset is None:
# Line 449  class RasterLayer(BaseLayer): Line 509  class RasterLayer(BaseLayer):
509          if bbox is None:          if bbox is None:
510              return None              return None
511    
         llx, lly, urx, ury = bbox  
512          if self.projection is not None:          if self.projection is not None:
513              llx, lly = self.projection.Inverse(llx, lly)              bbox = self.projection.InverseBBox(bbox)
514              urx, ury = self.projection.Inverse(urx, ury)  
515            return bbox
516    
517          return llx, lly, urx, ury      def Type(self):
518            return "Image"
519    
520      def GetImageFilename(self):      def GetImageFilename(self):
521          return self.filename          return self.filename
522    
523        def MaskType(self):
524            """Return True if the mask should be used when rendering the layer."""
525            return self.mask_type
526    
527        def SetMaskType(self, type):
528            """Set the type of mask to use.
529    
530            type can be one of MASK_NONE, MASK_BIT, MASK_ALPHA
531    
532            If the state changes, a LAYER_CHANGED message is sent.
533            """
534            if type not in (self.MASK_NONE, self.MASK_BIT, self.MASK_ALPHA):
535                raise ValueError("type is invalid")
536    
537            if type != self.mask_type:
538                self.mask_type = type
539                self.changed(LAYER_CHANGED, self)
540    
541        def Opacity(self):
542            """Return the level of opacity used in alpha blending.
543            """
544            return self.opacity
545    
546        def SetOpacity(self, op):
547            """Set the level of alpha opacity.
548    
549            0 <= op <= 1.
550    
551            The layer is fully opaque when op = 1.
552            """
553            if not (0 <= op <= 1):
554                raise ValueError("op out of range")
555    
556            if op != self.opacity:
557                self.opacity = op
558                self.changed(LAYER_CHANGED, self)
559    
560        def ImageInfo(self):
561            return self.image_info
562    
563      def TreeInfo(self):      def TreeInfo(self):
564          items = []          items = []
565    
566            items.append(_("Filename: %s") % self.GetImageFilename())
567    
568          if self.Visible():          if self.Visible():
569              items.append(_("Shown"))              items.append(_("Shown"))
570          else:          else:
571              items.append(_("Hidden"))              items.append(_("Hidden"))
         items.append(_("Shapes: %d") % self.NumShapes())  
572    
573          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
574          if bbox is not None:          if bbox is not None:
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