/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 725 by jonathan, Thu Apr 24 16:05:36 2003 UTC revision 1273 by jonathan, Fri Jun 20 17:45:49 2003 UTC
# Line 9  Line 9 
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
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 color import Color
23  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
24    
25    import resource
26    
27    
28  class Shape:  class Shape:
29    
# Line 31  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 43  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 66  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 75  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 85  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 106  class Layer(BaseLayer): Line 132  class Layer(BaseLayer):
132                   fill = Color.Transparent,                   fill = Color.Transparent,
133                   stroke = Color.Black,                   stroke = Color.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
# Line 122  class Layer(BaseLayer): Line 148  class Layer(BaseLayer):
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          self.projection = projection                                   projection = projection)
154    
155          #          #
156          # this is really important so that when the classification class          # this is really important so that when the classification class
# Line 144  class Layer(BaseLayer): Line 170  class Layer(BaseLayer):
170    
171          self.UnsetModified()          self.UnsetModified()
172    
173        def __getattr__(self, attr):
174            """Access to some attributes for backwards compatibility
175    
176            The attributes implemented here are now held by the shapestore
177            if at all. For backwards compatibility pretend that they are
178            still there but issue a DeprecationWarning when they are
179            accessed.
180            """
181            if attr in ("table", "shapetable"):
182                value = self.store.Table()
183            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):      def SetShapeStore(self, store):
195          self.store = store          self.store = store
196          self.shapefile = self.store.Shapefile()          shapefile = self.store.Shapefile()
         self.shapetable = self.store.Table()  
         self.filename = self.store.filename  
         self.table = self.shapetable  
197    
198          numshapes, shapetype, mins, maxs = self.shapefile.info()          numshapes, shapetype, mins, maxs = shapefile.info()
199          self.numshapes = numshapes          self.numshapes = numshapes
200          self.shapetype = shapelib_shapetypes[shapetype]          self.shapetype = shapelib_shapetypes[shapetype]
201    
# Line 172  class Layer(BaseLayer): Line 215  class Layer(BaseLayer):
215          else:          else:
216              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
217    
218          self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,          self.shapetree = shptree.SHPTree(shapefile.cobject(), 2,
219                                           maxdepth)                                           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:          if self.__classification is not None:
226              fieldname = self.__classification.GetField()              fieldname = self.__classification.GetField()
227              if not self.store.Table().field_info_by_name(fieldname):              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)                  self.SetClassification(None)
233          self.changed(LAYER_CHANGED, self)          self.changed(LAYER_SHAPESTORE_REPLACED, self)
234    
235      def ShapeStore(self):      def ShapeStore(self):
236          return self.store          return self.store
# Line 209  class Layer(BaseLayer): Line 261  class Layer(BaseLayer):
261          else:          else:
262              return None              return None
263    
264      def GetFieldType(self, fieldName):      def ShapesBoundingBox(self, shapes):
265          info = self.table.field_info_by_name(fieldName)          """Return a bounding box in lat/long coordinates for the given
266          if info is not None:          list of shape ids.
267              return info[0]  
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:          else:
281              return None              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"""
# Line 228  class Layer(BaseLayer): Line 314  class Layer(BaseLayer):
314    
315      def Shape(self, index):      def Shape(self, index):
316          """Return the shape with index index"""          """Return the shape with index index"""
317          shape = self.shapefile.read_object(index)          shape = self.store.Shapefile().read_object(index)
318    
319          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
320              points = shape.vertices()              points = shape.vertices()
# Line 244  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
         return self.shapetree.find_shapes((left, bottom), (right, top))  
336    
337      def GetProjection(self):          if self.projection is not None:
338          return self.projection              left,  bottom = self.projection.Forward(left, bottom)
339                right, top    = self.projection.Forward(right, top)
340    
341      def SetProjection(self, projection):          return self.shapetree.find_shapes((left, bottom), (right, top))
342          """Set the layer's projection"""  
343          self.projection = projection      def HasClassification(self):
344          self.changed(LAYER_PROJECTION_CHANGED, self)          return True
345    
346      def GetClassification(self):      def GetClassification(self):
347          return self.__classification          return self.__classification
# Line 295  class Layer(BaseLayer): Line 380  class Layer(BaseLayer):
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 308  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    
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