/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 21 by bh, Tue Sep 4 16:45:28 2001 UTC revision 929 by jonathan, Tue May 20 15:22:42 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          self.open_shapefile()          # tries to set its parent layer the variable will exist
156          # shapetable is the table associated with the shapefile, while          #
157          # table is the default table used to look up attributes for          self.__classification = None
158          # display          self.__setClassLock = False
159          self.shapetable = Table(filename)  
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            self.filename = self.store.filename
177          self.table = self.shapetable          self.table = self.shapetable
178    
179      def open_shapefile(self):          numshapes, shapetype, mins, maxs = self.shapefile.info()
180          if self.shapefile is None:          self.numshapes = numshapes
181              self.shapefile = shapelib.ShapeFile(self.filename)          self.shapetype = shapelib_shapetypes[shapetype]
182              numshapes, shapetype, mins, maxs = self.shapefile.info()  
183              self.numshapes = numshapes          # if there are shapes, set the bbox accordingly. Otherwise
184              self.shapetype = shapelib_shapetypes[shapetype]          # set it to None.
185            if self.numshapes:
186              self.bbox = mins[:2] + maxs[:2]              self.bbox = mins[:2] + maxs[:2]
187            else:
188                self.bbox = None
189    
190            # estimate a good depth for the quad tree. Each depth
191            # multiplies the number of nodes by four, therefore we
192            # basically take the base 4 logarithm of the number of
193            # shapes.
194            if self.numshapes < 4:
195                maxdepth = 1
196            else:
197                maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
198    
199            self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
200                                             maxdepth)
201            if self.__classification is not None:
202                fieldname = self.__classification.GetField()
203                if fieldname is not None and \
204                   not self.store.Table().HasColumn(fieldname):
205                    self.SetClassification(None)
206            self.changed(LAYER_CHANGED, self)
207    
208        def ShapeStore(self):
209            return self.store
210    
211        def Destroy(self):
212            BaseLayer.Destroy(self)
213            self.SetClassification(None)
214    
215      def BoundingBox(self):      def BoundingBox(self):
216          """Return the bounding box of the layer's shapes in their default          """Return the layer's bounding box in the intrinsic coordinate system.
217          coordinate system"""  
218          self.open_shapefile()          If the layer has no shapes, return None.
219            """
220          return self.bbox          return self.bbox
221    
222      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
223          """Return the layer's bounding box in lat/long coordinates"""          """Return the layer's bounding box in lat/long coordinates.
224          llx, lly, urx, ury = self.BoundingBox()  
225            Return None, if the layer doesn't contain any shapes.
226            """
227            bbox = self.BoundingBox()
228            if bbox is not None:
229                llx, lly, urx, ury = bbox
230                if self.projection is not None:
231                    llx, lly = self.projection.Inverse(llx, lly)
232                    urx, ury = self.projection.Inverse(urx, ury)
233                return llx, lly, urx, ury
234            else:
235                return None
236    
237        def ShapesBoundingBox(self, shapes):
238            """Return a bounding box in lat/long coordinates for the given
239            list of shape ids.
240    
241            If shapes is None or empty, return None.
242            """
243    
244            if shapes is None or len(shapes) == 0: return None
245    
246            llx = []
247            lly = []
248            urx = []
249            ury = []
250    
251          if self.projection is not None:          if self.projection is not None:
252              llx, lly = self.projection.Inverse(llx, lly)              inverse = lambda x, y: self.projection.Inverse(x, y)
253              urx, ury = self.projection.Inverse(urx, ury)          else:
254          return llx, lly, urx, ury              inverse = lambda x, y: (x, y)
255    
256            for id in shapes:
257                left, bottom, right, top = self.Shape(id).compute_bbox()
258    
259                left, bottom = inverse(left, bottom)
260                right, top   = inverse(right, top)
261    
262                llx.append(left)
263                lly.append(bottom)
264                urx.append(right)
265                ury.append(top)
266    
267            return (min(llx), min(lly), max(urx), max(ury))
268    
269        def GetFieldType(self, fieldName):
270            if self.table.HasColumn(fieldName):
271                return self.table.Column(fieldName).type
272            return None
273    
274      def NumShapes(self):      def NumShapes(self):
275          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
276          return self.numshapes          return self.numshapes
277    
278      def ShapeType(self):      def ShapeType(self):
279          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
280          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
281          """          """
         self.open_shapefile()  
282          return self.shapetype          return self.shapetype
283    
284      def Shape(self, index):      def Shape(self, index):
285          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
286          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
287    
288          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
289              points = shape.vertices()              points = shape.vertices()
290          else:          else:
# Line 174  class Layer(BaseLayer): Line 292  class Layer(BaseLayer):
292              poly = shape.vertices()[0]              poly = shape.vertices()[0]
293              points = []              points = []
294              for x, y in poly:              for x, y in poly:
295                  points.append(x, y)                  points.append((x, y))
296    
297          return Shape(points)          return Shape(points)
298    
299      def SetProjection(self, projection):      def ShapesInRegion(self, box):
300          """Set the layer's projection"""          """Return the ids of the shapes that overlap the box.
301    
302            Box is a tuple (left, bottom, right, top) in unprojected coordinates.
303            """
304            left, bottom, right, top = box
305    
306            if self.projection is not None:
307                left,  bottom = self.projection.Forward(left, bottom)
308                right, top    = self.projection.Forward(right, top)
309    
310            return self.shapetree.find_shapes((left, bottom), (right, top))
311    
312        def HasClassification(self):
313            return True
314    
315        def GetClassification(self):
316            return self.__classification
317    
318        def SetClassification(self, clazz):
319            """Set the classification to 'clazz'
320    
321            If 'clazz' is None a default classification is created
322            """
323    
324            # prevent infinite recursion when calling SetLayer()
325            if self.__setClassLock: return
326    
327            self.__setClassLock = True
328    
329            if clazz is None:
330                if self.__classification is not None:
331                    self.__classification.SetLayer(None)
332                self.__classification = classification.Classification()
333            else:
334                self.__classification = clazz
335                try:
336                    self.__classification.SetLayer(self)
337                except ValueError:
338                    self.__setClassLock = False
339                    raise ValueError
340    
341            self.changed(LAYER_CHANGED, self)
342    
343            self.__setClassLock = False
344    
345        def ClassChanged(self):
346            """Called from the classification object when it has changed."""
347            self.changed(LAYER_CHANGED, self)
348    
349        def TreeInfo(self):
350            items = []
351    
352            if self.Visible():
353                items.append(_("Shown"))
354            else:
355                items.append(_("Hidden"))
356            items.append(_("Shapes: %d") % self.NumShapes())
357    
358            bbox = self.LatLongBoundingBox()
359            if bbox is not None:
360                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
361            else:
362                items.append(_("Extent (lat-lon):"))
363            items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
364    
365            if self.projection and len(self.projection.params) > 0:
366                items.append((_("Projection"),
367                            [str(param) for param in self.projection.params]))
368    
369            items.append(self.__classification)
370    
371            return (_("Layer '%s'") % self.Title(), items)
372    
373    
374    class RasterLayer(BaseLayer):
375    
376        def __init__(self, title, filename, projection = None, visible = True):
377            """Initialize the Raster Layer.
378    
379            title -- title for the layer.
380    
381            filename -- file name of the source image.
382    
383            projection -- Projection object describing the projection which
384                          the source image is in.
385    
386            visible -- True is the layer should initially be visible.
387            """
388    
389            BaseLayer.__init__(self, title, visible = visible)
390    
391          self.projection = projection          self.projection = projection
392          self.changed(LAYER_PROJECTION_CHANGED, self)          self.filename = filename
393    
394            self.bbox = -1
395    
396            self.UnsetModified()
397    
398    
399        def BoundingBox(self):
400            """Return the layer's bounding box in the intrinsic coordinate system.
401    
402            If the layer has no shapes, return None.
403            """
404            if self.bbox == -1:
405                dataset = gdal.Open(self.filename, GA_ReadOnly)
406                if dataset is None:
407                    self.bbox = None
408                else:
409                    left, bottom = self.__CalcCorner(dataset,
410                                                     0, dataset.RasterYSize)
411                    right, top   = self.__CalcCorner(dataset,
412                                                     dataset.RasterXSize, 0)
413                    self.bbox = (left, bottom, right, top)
414    
415            return self.bbox
416    
417        def __CalcCorner(self, dataset, x, y):
418            geotransform = dataset.GetGeoTransform()
419            return geotransform[0] + geotransform[1] * x + geotransform[2] * y, \
420                   geotransform[3] + geotransform[4] * x + geotransform[5] * y
421    
422        def LatLongBoundingBox(self):
423            bbox = self.BoundingBox()
424            if bbox is not None:
425                llx, lly, urx, ury = bbox
426                if self.projection is not None:
427                    llx, lly = self.projection.Inverse(llx, lly)
428                    urx, ury = self.projection.Inverse(urx, ury)
429                return llx, lly, urx, ury
430            else:
431                return None
432    
433        def GetImageFilename(self):
434            return self.filename
435    
436        def TreeInfo(self):
437            items = []
438    
439            if self.Visible():
440                items.append(_("Shown"))
441            else:
442                items.append(_("Hidden"))
443            items.append(_("Shapes: %d") % self.NumShapes())
444    
445            bbox = self.LatLongBoundingBox()
446            if bbox is not None:
447                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
448            else:
449                items.append(_("Extent (lat-lon):"))
450    
451            if self.projection and len(self.projection.params) > 0:
452                items.append((_("Projection"),
453                            [str(param) for param in self.projection.params]))
454    
455            return (_("Layer '%s'") % self.Title(), items)
456    
     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.21  
changed lines
  Added in v.929
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