/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 143 by bh, Tue May 7 14:17:20 2002 UTC revision 929 by jonathan, Tue May 20 15:22:42 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    
11    from math import log, ceil
12    
13    from Thuban import _
14    
15  import shapelib, shptree  import shapelib, shptree
16    
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  import gdal
18       LAYER_VISIBILITY_CHANGED  from gdalconst import GA_ReadOnly
19    
20  from color import Color  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
21  # Some predefined colors for internal use       LAYER_CHANGED
 _black = Color(0, 0, 0)  
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, stroke_width = 1, 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.stroke_width = stroke_width          # this is really important so that when the classification class
155          self.shapefile = None          # tries to set its parent layer the variable will exist
156          self.shapetree = None          #
157          self.open_shapefile()          self.__classification = None
158          # shapetable is the table associated with the shapefile, while          self.__setClassLock = False
159          # table is the default table used to look up attributes for  
160          # display          self.SetShapeStore(data)
161          self.shapetable = Table(filename)  
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              #print "building tree for", self.filename, "..."          else:
188              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2, 0)              self.bbox = None
189              #print "done"  
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 180  class Layer(BaseLayer): Line 293  class Layer(BaseLayer):
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 ShapesInRegion(self, box):      def ShapesInRegion(self, box):
300          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
301    
302          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.  
303          """          """
304          left, bottom, right, top = box          left, bottom, right, top = box
         import time  
         start = time.time()  
         ids = self.shapetree.find_shapes((left, bottom), (right, top))  
         print "ShapesInRegion", time.time() - start  
         return ids  
305    
306      def SetProjection(self, projection):          if self.projection is not None:
307          """Set the layer's projection"""              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)  
   
     def SetStrokeWidth(self, width):  
         """Set the layer's stroke width."""  
         self.stroke_width = width  
         self.changed(LAYER_LEGEND_CHANGED, self)  
Legend:
Removed from v.143  
changed lines
  Added in v.929
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