/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 1088 by bh, Wed May 28 12:42:23 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 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    
11  import shapelib  from math import log, ceil
12    
13  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from Thuban import _
      LAYER_VISIBILITY_CHANGED  
14    
15  from color import Color  import shapelib, shptree
16  # Some predefined colors for internal use  
17  _black = Color(0, 0, 0)  import gdal
18    from gdalconst import GA_ReadOnly
19    
20    from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
21         LAYER_CHANGED
22    
23    from color import Color
24    
25  from table import Table  import classification
26    
27  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
28    
29    
30  class Shape:  class Shape:
31    
32      """Represent one shape"""      """Represent one shape"""
# Line 28  class Shape: Line 34  class Shape:
34      def __init__(self, points):      def __init__(self, points):
35          self.points = points          self.points = points
36          #self.compute_bbox()          #self.compute_bbox()
37            self.bbox = None
38    
39      def compute_bbox(self):      def compute_bbox(self):
40            if self.bbox is not None:
41                return self.bbox
42    
43          xs = []          xs = []
44          ys = []          ys = []
45          for x, y in self.points:          for x, y in self.points:
# Line 40  class Shape: Line 50  class Shape:
50          self.urx = max(xs)          self.urx = max(xs)
51          self.ury = max(ys)          self.ury = max(ys)
52    
53            self.bbox = (self.llx, self.lly, self.urx, self.ury)
54    
55            return self.bbox
56    
57      def Points(self):      def Points(self):
58          return self.points          return self.points
59    
# Line 63  class BaseLayer(TitledObject, Modifiable Line 77  class BaseLayer(TitledObject, Modifiable
77    
78      """Base class for the layers."""      """Base class for the layers."""
79    
80      def __init__(self, title, visible = 1):      def __init__(self, title, visible = True, projection = None):
81          """Initialize the layer.          """Initialize the layer.
82    
83          title -- the title          title -- the title
# Line 72  class BaseLayer(TitledObject, Modifiable Line 86  class BaseLayer(TitledObject, Modifiable
86          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
87          Modifiable.__init__(self)          Modifiable.__init__(self)
88          self.visible = visible          self.visible = visible
89            self.projection = projection
90    
91      def Visible(self):      def Visible(self):
92          """Return true if layer is visible"""          """Return true if layer is visible"""
# Line 81  class BaseLayer(TitledObject, Modifiable Line 96  class BaseLayer(TitledObject, Modifiable
96          """Set the layer's visibility."""          """Set the layer's visibility."""
97          self.visible = visible          self.visible = visible
98          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
99            
100                def HasClassification(self):
101            """Determine if this layer support classifications."""
102            return False
103    
104        def GetProjection(self):
105            """Return the layer's projection."""
106            return self.projection
107    
108        def SetProjection(self, projection):
109            """Set the layer's projection"""
110            self.projection = projection
111            self.changed(LAYER_PROJECTION_CHANGED, self)
112    
113  class Layer(BaseLayer):  class Layer(BaseLayer):
114    
115      """Represent the information of one geodata file (currently a shapefile)      """Represent the information of one geodata file (currently a shapefile)
# Line 97  class Layer(BaseLayer): Line 124  class Layer(BaseLayer):
124    
125          TITLE_CHANGED -- The title has changed.          TITLE_CHANGED -- The title has changed.
126          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
         LAYER_LEGEND_CHANGED -- the fill or stroke attributes have changed  
   
127      """      """
128    
129      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
130                   fill = None, stroke = _black, visible = 1):                   fill = Color.Transparent,
131                     stroke = Color.Black,
132                     lineWidth = 1,
133                     visible = True):
134          """Initialize the layer.          """Initialize the layer.
135    
136          title -- the title          title -- the title
137          filename -- the name of the shapefile          data -- datastore object for the shape data shown by the layer
138          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
139                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
140                 coordinates                 coordinates
141          fill -- the fill color or None if the shapes are not filled          fill -- the fill color or Color.Transparent if the shapes are
142          stroke -- the stroke color or None if the shapes are not stroked                  not filled
143            stroke -- the stroke color or Color.Transparent if the shapes
144                    are not stroked
145          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
146    
147          colors are expected to be instances of Color class          colors are expected to be instances of Color class
148          """          """
149          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title,
150          self.filename = filename                                   visible = visible,
151          self.projection = projection                                   projection = projection)
152          self.fill = fill  
153          self.stroke = stroke          #
154          self.shapefile = None          # this is really important so that when the classification class
155          # shapetable is the table associated with the shapefile, while          # tries to set its parent layer the variable will exist
156          # table is the default table used to look up attributes for          #
157          # display          self.__classification = None
158          self.shapetable = Table(filename)          self.__setClassLock = False
159    
160            self.SetShapeStore(data)
161    
162            self.SetClassification(None)
163    
164            self.__classification.SetDefaultLineColor(stroke)
165            self.__classification.SetDefaultLineWidth(lineWidth)
166            self.__classification.SetDefaultFill(fill)
167            self.__classification.SetLayer(self)
168    
169            self.UnsetModified()
170    
171    
172        def SetShapeStore(self, store):
173            self.store = store
174            self.shapefile = self.store.Shapefile()
175            self.shapetable = self.store.Table()
176            if hasattr(self.store, "FileName"):
177                self.filename = self.store.FileName()
178          self.table = self.shapetable          self.table = self.shapetable
179    
180      def open_shapefile(self):          numshapes, shapetype, mins, maxs = self.shapefile.info()
181          if self.shapefile is None:          self.numshapes = numshapes
182              self.shapefile = shapelib.ShapeFile(self.filename)          self.shapetype = shapelib_shapetypes[shapetype]
183              numshapes, shapetype, mins, maxs = self.shapefile.info()  
184              self.numshapes = numshapes          # if there are shapes, set the bbox accordingly. Otherwise
185              self.shapetype = shapelib_shapetypes[shapetype]          # set it to None.
186            if self.numshapes:
187              self.bbox = mins[:2] + maxs[:2]              self.bbox = mins[:2] + maxs[:2]
188            else:
189                self.bbox = None
190    
191            # estimate a good depth for the quad tree. Each depth
192            # multiplies the number of nodes by four, therefore we
193            # basically take the base 4 logarithm of the number of
194            # shapes.
195            if self.numshapes < 4:
196                maxdepth = 1
197            else:
198                maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
199    
200            self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
201                                             maxdepth)
202            # Set the classification to None if there is a classification
203            # and the new shapestore doesn't have a table with a suitable
204            # column, i.e one with the same name and type as before
205            # FIXME: Maybe we should keep it the same if the type is
206            # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
207            if self.__classification is not None:
208                fieldname = self.__classification.GetField()
209                fieldtype = self.__classification.GetFieldType()
210                table = self.store.Table()
211                if (fieldname is not None
212                    and (not table.HasColumn(fieldname)
213                         or table.Column(fieldname).type != fieldtype)):
214                    self.SetClassification(None)
215            self.changed(LAYER_CHANGED, self)
216    
217        def ShapeStore(self):
218            return self.store
219    
220        def Destroy(self):
221            BaseLayer.Destroy(self)
222            self.SetClassification(None)
223    
224      def BoundingBox(self):      def BoundingBox(self):
225          """Return the bounding box of the layer's shapes in their default          """Return the layer's bounding box in the intrinsic coordinate system.
226          coordinate system"""  
227          self.open_shapefile()          If the layer has no shapes, return None.
228            """
229          return self.bbox          return self.bbox
230    
231      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
232          """Return the layer's bounding box in lat/long coordinates"""          """Return the layer's bounding box in lat/long coordinates.
233          llx, lly, urx, ury = self.BoundingBox()  
234            Return None, if the layer doesn't contain any shapes.
235            """
236            bbox = self.BoundingBox()
237            if bbox is not None:
238                llx, lly, urx, ury = bbox
239                if self.projection is not None:
240                    llx, lly = self.projection.Inverse(llx, lly)
241                    urx, ury = self.projection.Inverse(urx, ury)
242                return llx, lly, urx, ury
243            else:
244                return None
245    
246        def ShapesBoundingBox(self, shapes):
247            """Return a bounding box in lat/long coordinates for the given
248            list of shape ids.
249    
250            If shapes is None or empty, return None.
251            """
252    
253            if shapes is None or len(shapes) == 0: return None
254    
255            llx = []
256            lly = []
257            urx = []
258            ury = []
259    
260          if self.projection is not None:          if self.projection is not None:
261              llx, lly = self.projection.Inverse(llx, lly)              inverse = lambda x, y: self.projection.Inverse(x, y)
262              urx, ury = self.projection.Inverse(urx, ury)          else:
263          return llx, lly, urx, ury              inverse = lambda x, y: (x, y)
264    
265            for id in shapes:
266                left, bottom, right, top = self.Shape(id).compute_bbox()
267    
268                left, bottom = inverse(left, bottom)
269                right, top   = inverse(right, top)
270    
271                llx.append(left)
272                lly.append(bottom)
273                urx.append(right)
274                ury.append(top)
275    
276            return (min(llx), min(lly), max(urx), max(ury))
277    
278        def GetFieldType(self, fieldName):
279            if self.table.HasColumn(fieldName):
280                return self.table.Column(fieldName).type
281            return None
282    
283      def NumShapes(self):      def NumShapes(self):
284          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
285          return self.numshapes          return self.numshapes
286    
287      def ShapeType(self):      def ShapeType(self):
288          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
289          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
290          """          """
         self.open_shapefile()  
291          return self.shapetype          return self.shapetype
292    
293      def Shape(self, index):      def Shape(self, index):
294          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
295          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
296    
297          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
298              points = shape.vertices()              points = shape.vertices()
299          else:          else:
# Line 173  class Layer(BaseLayer): Line 301  class Layer(BaseLayer):
301              poly = shape.vertices()[0]              poly = shape.vertices()[0]
302              points = []              points = []
303              for x, y in poly:              for x, y in poly:
304                  points.append(x, y)                  points.append((x, y))
305    
306          return Shape(points)          return Shape(points)
307    
308      def SetProjection(self, projection):      def ShapesInRegion(self, box):
309          """Set the layer's projection"""          """Return the ids of the shapes that overlap the box.
310    
311            Box is a tuple (left, bottom, right, top) in unprojected coordinates.
312            """
313            left, bottom, right, top = box
314    
315            if self.projection is not None:
316                left,  bottom = self.projection.Forward(left, bottom)
317                right, top    = self.projection.Forward(right, top)
318    
319            return self.shapetree.find_shapes((left, bottom), (right, top))
320    
321        def HasClassification(self):
322            return True
323    
324        def GetClassification(self):
325            return self.__classification
326    
327        def SetClassification(self, clazz):
328            """Set the classification to 'clazz'
329    
330            If 'clazz' is None a default classification is created
331            """
332    
333            # prevent infinite recursion when calling SetLayer()
334            if self.__setClassLock: return
335    
336            self.__setClassLock = True
337    
338            if clazz is None:
339                if self.__classification is not None:
340                    self.__classification.SetLayer(None)
341                self.__classification = classification.Classification()
342            else:
343                self.__classification = clazz
344                try:
345                    self.__classification.SetLayer(self)
346                except ValueError:
347                    self.__setClassLock = False
348                    raise ValueError
349    
350            self.changed(LAYER_CHANGED, self)
351    
352            self.__setClassLock = False
353    
354        def ClassChanged(self):
355            """Called from the classification object when it has changed."""
356            self.changed(LAYER_CHANGED, self)
357    
358        def TreeInfo(self):
359            items = []
360    
361            if hasattr(self, 'filename'):
362                items.append(_("Filename: %s") % self.filename)
363    
364            if self.Visible():
365                items.append(_("Shown"))
366            else:
367                items.append(_("Hidden"))
368            items.append(_("Shapes: %d") % self.NumShapes())
369    
370            bbox = self.LatLongBoundingBox()
371            if bbox is not None:
372                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
373            else:
374                items.append(_("Extent (lat-lon):"))
375            items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
376    
377            if self.projection and len(self.projection.params) > 0:
378                items.append((_("Projection"),
379                            [str(param) for param in self.projection.params]))
380    
381            items.append(self.__classification)
382    
383            return (_("Layer '%s'") % self.Title(), items)
384    
385    
386    class RasterLayer(BaseLayer):
387    
388        def __init__(self, title, filename, projection = None, visible = True):
389            """Initialize the Raster Layer.
390    
391            title -- title for the layer.
392    
393            filename -- file name of the source image.
394    
395            projection -- Projection object describing the projection which
396                          the source image is in.
397    
398            visible -- True is the layer should initially be visible.
399    
400            Throws IOError if the filename is invalid or points to a file that
401            is not in a format GDAL can use.
402            """
403    
404            BaseLayer.__init__(self, title, visible = visible)
405    
406          self.projection = projection          self.projection = projection
407          self.changed(LAYER_PROJECTION_CHANGED, self)          self.filename = filename
408    
409            self.bbox = -1
410    
411            #
412            # temporarily open the file so that GDAL can test if it's valid.
413            #
414            dataset = gdal.Open(self.filename, GA_ReadOnly)
415    
416            if dataset is None:
417                raise IOError()
418    
419            self.UnsetModified()
420    
421        def BoundingBox(self):
422            """Return the layer's bounding box in the intrinsic coordinate system.
423    
424            If the layer has no shapes, return None.
425            """
426            if self.bbox == -1:
427                dataset = gdal.Open(self.filename, GA_ReadOnly)
428                if dataset is None:
429                    self.bbox = None
430                else:
431                    geotransform = dataset.GetGeoTransform()
432                    if geotransform is None:
433                        return None
434    
435                    x = 0
436                    y = dataset.RasterYSize
437                    left = geotransform[0] +        \
438                           geotransform[1] * x +    \
439                           geotransform[2] * y
440    
441                    bottom = geotransform[3] +      \
442                             geotransform[4] * x +  \
443                             geotransform[5] * y
444    
445                    x = dataset.RasterXSize
446                    y = 0
447                    right = geotransform[0] +       \
448                            geotransform[1] * x +   \
449                            geotransform[2] * y
450    
451                    top = geotransform[3] +         \
452                          geotransform[4] * x +     \
453                          geotransform[5] * y
454    
455                    self.bbox = (left, bottom, right, top)
456    
457            return self.bbox
458    
459        def LatLongBoundingBox(self):
460            bbox = self.BoundingBox()
461            if bbox is None:
462                return None
463    
464            llx, lly, urx, ury = bbox
465            if self.projection is not None:
466                llx, lly = self.projection.Inverse(llx, lly)
467                urx, ury = self.projection.Inverse(urx, ury)
468    
469            return llx, lly, urx, ury
470    
471        def GetImageFilename(self):
472            return self.filename
473    
474        def TreeInfo(self):
475            items = []
476    
477            if self.Visible():
478                items.append(_("Shown"))
479            else:
480                items.append(_("Hidden"))
481            items.append(_("Shapes: %d") % self.NumShapes())
482    
483            bbox = self.LatLongBoundingBox()
484            if bbox is not None:
485                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
486            else:
487                items.append(_("Extent (lat-lon):"))
488    
489            if self.projection and len(self.projection.params) > 0:
490                items.append((_("Projection"),
491                            [str(param) for param in self.projection.params]))
492    
493            return (_("Layer '%s'") % self.Title(), items)
494    
     def SetFill(self, fill):  
         """Set the layer's fill color. None means the shapes are not filled"""  
         self.fill = fill  
         self.changed(LAYER_LEGEND_CHANGED, self)  
   
     def SetStroke(self, stroke):  
         """Set the layer's stroke color. None means the shapes are not  
         stroked."""  
         self.stroke = stroke  
         self.changed(LAYER_LEGEND_CHANGED, self)  
Legend:
Removed from v.6  
changed lines
  Added in v.1088
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