/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 412 by jonathan, Wed Feb 19 16:51:50 2003 UTC revision 1273 by jonathan, Fri Jun 20 17:45:49 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    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_LEGEND_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
18       LAYER_VISIBILITY_CHANGED       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED
19    
20    import classification
21    
22  from color import Color  from color import Color
23    from base import TitledObject, Modifiable
24    
25  from classification import Classification  import resource
26    
 from table import Table  
   
 from base import TitledObject, Modifiable  
27    
28  class Shape:  class Shape:
29    
# 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 102  class Layer(BaseLayer): Line 126  class Layer(BaseLayer):
126    
127          TITLE_CHANGED -- The title has changed.          TITLE_CHANGED -- The title has changed.
128          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
         LAYER_LEGEND_CHANGED -- the fill or stroke attributes have changed  
   
129      """      """
130    
131      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
132                   fill = Color.None,                   fill = Color.Transparent,
133                   stroke = Color.Black,                   stroke = Color.Black,
134                   stroke_width = 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 None if the shapes are not filled          fill -- the fill color or Color.Transparent if the shapes are
144          stroke -- the stroke color or None if the shapes are not stroked                  not filled
145            stroke -- the stroke color or Color.Transparent if the shapes
146                    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                                     projection = projection)
154    
155            #
156            # this is really important so that when the classification class
157            # tries to set its parent layer the variable will exist
158            #
159            self.__classification = None
160            self.__setClassLock = False
161    
162          # Make the filename absolute. The filename will be          self.SetShapeStore(data)
         # 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)  
163    
164          self.projection = projection          self.SetClassification(None)
165          self.shapefile = None  
166          self.shapetree = None          self.__classification.SetDefaultLineColor(stroke)
167          self.open_shapefile()          self.__classification.SetDefaultLineWidth(lineWidth)
         # 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  
   
         self.__classification = Classification(self)  
         self.__classification.SetDefaultStroke(stroke)  
         self.__classification.SetDefaultStrokeWidth(stroke_width)  
168          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
169            self.__classification.SetLayer(self)
170    
171          self.UnsetModified()          self.UnsetModified()
172    
173      def open_shapefile(self):      def __getattr__(self, attr):
174          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  
175    
176              # estimate a good depth for the quad tree. Each depth          The attributes implemented here are now held by the shapestore
177              # multiplies the number of nodes by four, therefore we          if at all. For backwards compatibility pretend that they are
178              # basically take the base 4 logarithm of the number of          still there but issue a DeprecationWarning when they are
179              # shapes.          accessed.
180              if self.numshapes < 4:          """
181                  maxdepth = 1          if attr in ("table", "shapetable"):
182              else:              value = self.store.Table()
183                  maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))          elif attr == "shapefile":
184                value = self.store.Shapefile()
185            elif attr == "filename":
186                value = self.store.FileName()
187            else:
188                raise AttributeError, attr
189            warnings.warn("The Layer attribute %r is deprecated."
190                          " It's value can be accessed through the shapestore"
191                          % attr, DeprecationWarning, stacklevel = 2)
192            return value
193    
194        def SetShapeStore(self, store):
195            self.store = store
196            shapefile = self.store.Shapefile()
197    
198            numshapes, shapetype, mins, maxs = shapefile.info()
199            self.numshapes = numshapes
200            self.shapetype = shapelib_shapetypes[shapetype]
201    
202            # if there are shapes, set the bbox accordingly. Otherwise
203            # set it to None.
204            if self.numshapes:
205                self.bbox = mins[:2] + maxs[:2]
206            else:
207                self.bbox = None
208    
209            # estimate a good depth for the quad tree. Each depth
210            # multiplies the number of nodes by four, therefore we
211            # basically take the base 4 logarithm of the number of
212            # shapes.
213            if self.numshapes < 4:
214                maxdepth = 1
215            else:
216                maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
217    
218            self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,
219                                             maxdepth)
220            # Set the classification to None if there is a classification
221            # and the new shapestore doesn't have a table with a suitable
222            # column, i.e one with the same name and type as before
223            # FIXME: Maybe we should keep it the same if the type is
224            # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
225            if self.__classification is not None:
226                fieldname = self.__classification.GetField()
227                fieldtype = self.__classification.GetFieldType()
228                table = self.store.Table()
229                if (fieldname is not None
230                    and (not table.HasColumn(fieldname)
231                         or table.Column(fieldname).type != fieldtype)):
232                    self.SetClassification(None)
233            self.changed(LAYER_SHAPESTORE_REPLACED, self)
234    
235              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,      def ShapeStore(self):
236                                               maxdepth)          return self.store
237    
238      def Destroy(self):      def Destroy(self):
239          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
240          if self.shapefile is not None:          self.SetClassification(None)
             self.shapefile.close()  
             self.shapefile = None  
             self.shapetree = None  
         self.table.Destroy()  
241    
242      def BoundingBox(self):      def BoundingBox(self):
243          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
244    
245          If the layer has no shapes, return None.          If the layer has no shapes, return None.
246          """          """
         # The bbox will be set by open_shapefile just as we need it  
         # here.  
         self.open_shapefile()  
247          return self.bbox          return self.bbox
248    
249      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
# Line 208  class Layer(BaseLayer): Line 261  class Layer(BaseLayer):
261          else:          else:
262              return None              return None
263    
264        def ShapesBoundingBox(self, shapes):
265            """Return a bounding box in lat/long coordinates for the given
266            list of shape ids.
267    
268            If shapes is None or empty, return None.
269            """
270    
271            if shapes is None or len(shapes) == 0: return None
272    
273            llx = []
274            lly = []
275            urx = []
276            ury = []
277    
278            if self.projection is not None:
279                inverse = lambda x, y: self.projection.Inverse(x, y)
280            else:
281                inverse = lambda x, y: (x, y)
282    
283            for id in shapes:
284                left, bottom, right, top = self.Shape(id).compute_bbox()
285    
286                left, bottom = inverse(left, bottom)
287                right, top   = inverse(right, top)
288    
289                llx.append(left)
290                lly.append(bottom)
291                urx.append(right)
292                ury.append(top)
293    
294            return (min(llx), min(lly), max(urx), max(ury))
295    
296        def GetFieldType(self, fieldName):
297            table = self.store.Table()
298            if table.HasColumn(fieldName):
299                return table.Column(fieldName).type
300            return None
301    
302        def HasShapes(self):
303            return True
304    
305      def NumShapes(self):      def NumShapes(self):
306          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
307          return self.numshapes          return self.numshapes
308    
309      def ShapeType(self):      def ShapeType(self):
310          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
311          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
312          """          """
         self.open_shapefile()  
313          return self.shapetype          return self.shapetype
314    
315      def Shape(self, index):      def Shape(self, index):
316          """Return the shape with index index"""          """Return the shape with index index"""
317          self.open_shapefile()          shape = self.store.Shapefile().read_object(index)
         shape = self.shapefile.read_object(index)  
318    
319          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
320              points = shape.vertices()              points = shape.vertices()
# Line 239  class Layer(BaseLayer): Line 330  class Layer(BaseLayer):
330      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
331          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
332    
333          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.  
334          """          """
335          left, bottom, right, top = box          left, bottom, right, top = box
336    
337            if self.projection is not None:
338                left,  bottom = self.projection.Forward(left, bottom)
339                right, top    = self.projection.Forward(right, top)
340    
341          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
342    
343      def SetProjection(self, projection):      def HasClassification(self):
344          """Set the layer's projection"""          return True
         self.projection = projection  
         self.changed(LAYER_PROJECTION_CHANGED, self)  
345    
346      def GetClassification(self):      def GetClassification(self):
347          return self.__classification          return self.__classification
348    
349      def SetClassification(self, clazz):      def SetClassification(self, clazz):
350          self.__classification = clazz          """Set the classification to 'clazz'
351          self.changed(LAYER_LEGEND_CHANGED, self)  
352            If 'clazz' is None a default classification is created
353            """
354    
355            # prevent infinite recursion when calling SetLayer()
356            if self.__setClassLock: return
357    
358            self.__setClassLock = True
359    
360            if clazz is None:
361                if self.__classification is not None:
362                    self.__classification.SetLayer(None)
363                self.__classification = classification.Classification()
364            else:
365                self.__classification = clazz
366                try:
367                    self.__classification.SetLayer(self)
368                except ValueError:
369                    self.__setClassLock = False
370                    raise ValueError
371    
372            self.changed(LAYER_CHANGED, self)
373    
374            self.__setClassLock = False
375    
376        def ClassChanged(self):
377            """Called from the classification object when it has changed."""
378            self.changed(LAYER_CHANGED, self)
379    
380      def TreeInfo(self):      def TreeInfo(self):
381          items = []          items = []
382    
383            if hasattr(self, 'filename'):
384                items.append(_("Filename: %s") % self.filename)
385    
386          if self.Visible():          if self.Visible():
387              items.append(_("Shown"))              items.append(_("Shown"))
388          else:          else:
# Line 273  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 layer has no shapes, return None.
452            """
453            if not resource.has_gdal_support():
454                return None
455    
456            if self.bbox == -1:
457                dataset = gdal.Open(self.filename, GA_ReadOnly)
458                if dataset is None:
459                    self.bbox = None
460                else:
461                    geotransform = dataset.GetGeoTransform()
462                    if geotransform is None:
463                        return None
464    
465                    x = 0
466                    y = dataset.RasterYSize
467                    left = geotransform[0] +        \
468                           geotransform[1] * x +    \
469                           geotransform[2] * y
470    
471                    bottom = geotransform[3] +      \
472                             geotransform[4] * x +  \
473                             geotransform[5] * y
474    
475                    x = dataset.RasterXSize
476                    y = 0
477                    right = geotransform[0] +       \
478                            geotransform[1] * x +   \
479                            geotransform[2] * y
480    
481                    top = geotransform[3] +         \
482                          geotransform[4] * x +     \
483                          geotransform[5] * y
484    
485                    self.bbox = (left, bottom, right, top)
486    
487            return self.bbox
488    
489        def LatLongBoundingBox(self):
490            bbox = self.BoundingBox()
491            if bbox is None:
492                return None
493    
494            llx, lly, urx, ury = bbox
495            if self.projection is not None:
496                llx, lly = self.projection.Inverse(llx, lly)
497                urx, ury = self.projection.Inverse(urx, ury)
498    
499            return llx, lly, urx, ury
500    
501        def GetImageFilename(self):
502            return self.filename
503    
504        def TreeInfo(self):
505            items = []
506    
507            if self.Visible():
508                items.append(_("Shown"))
509            else:
510                items.append(_("Hidden"))
511            items.append(_("Shapes: %d") % self.NumShapes())
512    
513            bbox = self.LatLongBoundingBox()
514            if bbox is not None:
515                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
516            else:
517                items.append(_("Extent (lat-lon):"))
518    
519            if self.projection and len(self.projection.params) > 0:
520                items.append((_("Projection"),
521                            [str(param) for param in self.projection.params]))
522    
523            return (_("Layer '%s'") % self.Title(), items)
524    
Legend:
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  Added in v.1273
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