/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 386 by jonathan, Mon Feb 3 11:44:27 2003 UTC revision 1452 by bh, Fri Jul 18 12:57:59 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]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
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, CLASS_CHANGED
19    
20  from color import Color  import classification
 # Some predefined colors for internal use  
 _black = Color(0, 0, 0)  
21    
22  from classification import Classification  from color import Transparent, Black
23    from base import TitledObject, Modifiable
24    
25  from table import Table  import resource
26    
 from base import TitledObject, Modifiable  
27    
28  class Shape:  class Shape:
29    
# Line 34  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 46  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 69  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 78  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 88  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 96  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:
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 = None, stroke = _black, stroke_width = 1, visible = 1):                   fill = Transparent,
133                     stroke = Black,
134                     lineWidth = 1,
135                     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 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 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          # Make the filename absolute. The filename will be          self.__classification = None
156          # interpreted relative to that anyway, but when saving a          self.store = None
         # session we need to compare absolute paths and it's usually  
         # safer to always work with absolute paths.  
         self.filename = os.path.abspath(filename)  
157    
158          self.projection = projection          self.SetShapeStore(data)
         self.fill = fill  
         self.stroke = stroke  
         self.stroke_width = stroke_width  
         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  
   
         self.classification = Classification()  
         self.classification.setNull(  
             {'stroke':stroke, 'stroke_width':stroke_width, 'fill':fill})  
   
     def open_shapefile(self):  
         if self.shapefile is None:  
             self.shapefile = shapelib.ShapeFile(self.filename)  
             numshapes, shapetype, mins, maxs = self.shapefile.info()  
             self.numshapes = numshapes  
             self.shapetype = shapelib_shapetypes[shapetype]  
   
             # if there are shapes, set the bbox accordinly. Otherwise  
             # set it to None.  
             if self.numshapes:  
                 self.bbox = mins[:2] + maxs[:2]  
             else:  
                 self.bbox = None  
159    
160              # estimate a good depth for the quad tree. Each depth          self.classification_column = None
161              # multiplies the number of nodes by four, therefore we          self.SetClassificationColumn(None)
162              # basically take the base 4 logarithm of the number of          self.SetClassification(None)
163              # shapes.  
164              if self.numshapes < 4:          self.__classification.SetDefaultLineColor(stroke)
165                  maxdepth = 1          self.__classification.SetDefaultLineWidth(lineWidth)
166              else:          self.__classification.SetDefaultFill(fill)
167                  maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))  
168            self.UnsetModified()
169    
170              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,      def __getattr__(self, attr):
171                                               maxdepth)          """Access to some attributes for backwards compatibility
172    
173            The attributes implemented here are now held by the shapestore
174            if at all. For backwards compatibility pretend that they are
175            still there but issue a DeprecationWarning when they are
176            accessed.
177            """
178            if attr in ("table", "shapetable"):
179                value = self.store.Table()
180            elif attr == "shapefile":
181                value = self.store.Shapefile()
182            elif attr == "filename":
183                value = self.store.FileName()
184            else:
185                raise AttributeError, attr
186            warnings.warn("The Layer attribute %r is deprecated."
187                          " It's value can be accessed through the shapestore"
188                          % attr, DeprecationWarning, stacklevel = 2)
189            return value
190    
191        def SetShapeStore(self, store):
192            # Set the classification to None if there is a classification
193            # and the new shapestore doesn't have a table with a suitable
194            # column, i.e one with the same name and type as before
195            # FIXME: Maybe we should keep it the same if the type is
196            # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
197            if self.__classification is not None:
198                columnname = self.classification_column
199                columntype = self.GetFieldType(columnname)
200                table = store.Table()
201                if (columnname is not None
202                    and (not table.HasColumn(columnname)
203                         or table.Column(columnname).type != columntype)):
204                    self.SetClassification(None)
205    
206            self.store = store
207            shapefile = self.store.Shapefile()
208    
209            numshapes, shapetype, mins, maxs = shapefile.info()
210            self.numshapes = numshapes
211            self.shapetype = shapelib_shapetypes[shapetype]
212    
213            # if there are shapes, set the bbox accordingly. Otherwise
214            # set it to None.
215            if self.numshapes:
216                self.bbox = mins[:2] + maxs[:2]
217            else:
218                self.bbox = None
219    
220            # estimate a good depth for the quad tree. Each depth
221            # multiplies the number of nodes by four, therefore we
222            # basically take the base 4 logarithm of the number of
223            # shapes.
224            if self.numshapes < 4:
225                maxdepth = 1
226            else:
227                maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
228    
229            self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,
230                                             maxdepth)
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:          if self.__classification is not None:
239              self.shapefile.close()              self.__classification.Unsubscribe(CLASS_CHANGED,
240              self.shapefile = None                                                self._classification_changed)
             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 206  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            if self.store:
298                table = self.store.Table()
299                if table.HasColumn(fieldName):
300                    return table.Column(fieldName).type
301            return None
302    
303        def HasShapes(self):
304            return True
305    
306      def NumShapes(self):      def NumShapes(self):
307          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
308          return self.numshapes          return self.numshapes
309    
310      def ShapeType(self):      def ShapeType(self):
311          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
312          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
313          """          """
         self.open_shapefile()  
314          return self.shapetype          return self.shapetype
315    
316      def Shape(self, index):      def Shape(self, index):
317          """Return the shape with index index"""          """Return the shape with index index"""
318          self.open_shapefile()          shape = self.store.Shapefile().read_object(index)
         shape = self.shapefile.read_object(index)  
319    
320          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
321              points = shape.vertices()              points = shape.vertices()
# Line 237  class Layer(BaseLayer): Line 331  class Layer(BaseLayer):
331      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
332          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
333    
334          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.  
335          """          """
336          left, bottom, right, top = box          left, bottom, right, top = box
337    
338            if self.projection is not None:
339                left,  bottom = self.projection.Forward(left, bottom)
340                right, top    = self.projection.Forward(right, top)
341    
342          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
343    
344      def SetProjection(self, projection):      def GetClassificationColumn(self):
345          """Set the layer's projection"""          return self.classification_column
         self.projection = projection  
         self.changed(LAYER_PROJECTION_CHANGED, self)  
346    
347      def SetFill(self, fill):      def SetClassificationColumn(self, column):
348          """Set the layer's fill color. None means the shapes are not filled"""          """Set the column to classifiy on, or None. If column is not None
349          null = self.classification.getNull()          and the column does not exist in the table, raise a ValueError.
350          null['fill'] = fill          """
351          self.classification.setNull(null)          if column:
352          self.changed(LAYER_LEGEND_CHANGED, self)              columnType = self.GetFieldType(column)
353                if columnType is None:
354      def SetStroke(self, stroke):                  raise ValueError()
355          """Set the layer's stroke color. None means the shapes are not          changed = self.classification_column != column
356          stroked."""          self.classification_column = column
357          null = self.classification.getNull()          if changed:
358          null['stroke'] = stroke              self.changed(LAYER_CHANGED, self)
359          self.classification.setNull(null)  
360          self.changed(LAYER_LEGEND_CHANGED, self)      def HasClassification(self):
361            return True
362      def SetStrokeWidth(self, width):  
363          """Set the layer's stroke width."""      def GetClassification(self):
364          null = self.classification.getNull()          return self.__classification
         null['stroke_width'] = width  
         self.classification.setNull(null)  
         self.changed(LAYER_LEGEND_CHANGED, self)  
365    
366        def SetClassification(self, clazz):
367            """Set the classification used by this layer to 'clazz'
368    
369            If 'clazz' is None a default classification is created.
370    
371            This issues a LAYER_CHANGED event.
372            """
373    
374            if self.__classification is not None:
375                self.__classification.Unsubscribe(CLASS_CHANGED,
376                                                  self._classification_changed)
377    
378            if clazz is None:
379                clazz = classification.Classification()
380    
381            self.__classification = clazz
382            self.__classification.Subscribe(CLASS_CHANGED,
383                                            self._classification_changed)
384    
385            self._classification_changed()
386    
387        def _classification_changed(self):
388            """Called from the classification object when it has changed."""
389            self.changed(LAYER_CHANGED, self)
390    
391      def TreeInfo(self):      def TreeInfo(self):
392          items = []          items = []
393    
394            items.append(_("Filename: %s") % self.ShapeStore().FileName())
395    
396          if self.Visible():          if self.Visible():
397              items.append(_("Shown"))              items.append(_("Shown"))
398          else:          else:
# Line 286  class Layer(BaseLayer): Line 406  class Layer(BaseLayer):
406              items.append(_("Extent (lat-lon):"))              items.append(_("Extent (lat-lon):"))
407          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
408    
409          def color_string(color):          if self.projection and len(self.projection.params) > 0:
410              if color is None:              items.append((_("Projection"),
411                  return "None"                          [str(param) for param in self.projection.params]))
             return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue)  
412    
413          # layers will always have a classification with at least a NULL data set          items.append(self.__classification)
414    
415          #items.append((_("Fill: %s") % color_string(self.fill), self.fill))          return (_("Layer '%s'") % self.Title(), items)
416          #items.append((_("Outline: %s") % color_string(self.stroke), self.stroke))  
417    
418    if resource.has_gdal_support():
419        import gdal
420        from gdalconst import GA_ReadOnly
421    
422    class RasterLayer(BaseLayer):
423    
424        def __init__(self, title, filename, projection = None, visible = True):
425            """Initialize the Raster Layer.
426    
427            title -- title for the layer.
428    
429            filename -- file name of the source image.
430    
431            projection -- Projection object describing the projection which
432                          the source image is in.
433    
434            visible -- True is the layer should initially be visible.
435    
436            Throws IOError if the filename is invalid or points to a file that
437            is not in a format GDAL can use.
438            """
439    
440            BaseLayer.__init__(self, title, visible = visible)
441    
442            self.projection = projection
443            self.filename = filename
444    
445            self.bbox = -1
446    
447            if resource.has_gdal_support():
448                #
449                # temporarily open the file so that GDAL can test if it's valid.
450                #
451                dataset = gdal.Open(self.filename, GA_ReadOnly)
452    
453                if dataset is None:
454                    raise IOError()
455    
456            self.UnsetModified()
457    
458        def BoundingBox(self):
459            """Return the layer's bounding box in the intrinsic coordinate system.
460    
461            If the there is no support for images, or the file cannot
462            be read, or there is no geographics information available, return None.
463            """
464            if not resource.has_gdal_support():
465                return None
466    
467            if self.bbox == -1:
468                dataset = gdal.Open(self.filename, GA_ReadOnly)
469                if dataset is None:
470                    self.bbox = None
471                else:
472                    geotransform = dataset.GetGeoTransform()
473                    if geotransform is None:
474                        return None
475    
476                    x = 0
477                    y = dataset.RasterYSize
478                    left = geotransform[0] +        \
479                           geotransform[1] * x +    \
480                           geotransform[2] * y
481    
482                    bottom = geotransform[3] +      \
483                             geotransform[4] * x +  \
484                             geotransform[5] * y
485    
486                    x = dataset.RasterXSize
487                    y = 0
488                    right = geotransform[0] +       \
489                            geotransform[1] * x +   \
490                            geotransform[2] * y
491    
492                    top = geotransform[3] +         \
493                          geotransform[4] * x +     \
494                          geotransform[5] * y
495    
496                    self.bbox = (left, bottom, right, top)
497    
498            return self.bbox
499    
500        def LatLongBoundingBox(self):
501            bbox = self.BoundingBox()
502            if bbox is None:
503                return None
504    
505            llx, lly, urx, ury = bbox
506            if self.projection is not None:
507                llx, lly = self.projection.Inverse(llx, lly)
508                urx, ury = self.projection.Inverse(urx, ury)
509    
510            return llx, lly, urx, ury
511    
512        def GetImageFilename(self):
513            return self.filename
514    
515        def TreeInfo(self):
516            items = []
517    
518            items.append(_("Filename: %s") % self.GetImageFilename())
519    
520            if self.Visible():
521                items.append(_("Shown"))
522            else:
523                items.append(_("Hidden"))
524    
525            bbox = self.LatLongBoundingBox()
526            if bbox is not None:
527                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
528            else:
529                items.append(_("Extent (lat-lon):"))
530    
531          items.append(self.classification)          if self.projection and len(self.projection.params) > 0:
532                items.append((_("Projection"),
533                            [str(param) for param in self.projection.params]))
534    
535          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
536    
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