/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 701 by bh, Thu Apr 17 16:18:48 2003 UTC revision 929 by jonathan, Tue May 20 15:22:42 2003 UTC
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
 import os  
11  from math import log, ceil  from math import log, ceil
12    
13  from Thuban import _  from Thuban import _
14    
15  import shapelib, shptree  import shapelib, shptree
16    
17    import gdal
18    from gdalconst import GA_ReadOnly
19    
20  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
21       LAYER_CHANGED       LAYER_CHANGED
22    
# Line 22  from color import Color Line 24  from color import Color
24    
25  import classification  import classification
26    
 from table import Table  
   
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 33  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 45  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 68  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 77  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 87  class BaseLayer(TitledObject, Modifiable Line 97  class BaseLayer(TitledObject, Modifiable
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    
# Line 104  class Layer(BaseLayer): Line 126  class Layer(BaseLayer):
126          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
127      """      """
128    
129      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
130                   fill = Color.Transparent,                   fill = Color.Transparent,
131                   stroke = Color.Black,                   stroke = Color.Black,
132                   lineWidth = 1,                   lineWidth = 1,
133                   visible = 1):                   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
# Line 124  class Layer(BaseLayer): Line 146  class Layer(BaseLayer):
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                                     visible = visible,
151          # Make the filename absolute. The filename will be                                   projection = projection)
         # interpreted relative to that anyway, but when saving a  
         # session we need to compare absolute paths and it's usually  
         # safer to always work with absolute paths.  
         self.filename = os.path.abspath(filename)  
   
         self.projection = projection  
         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  
152    
153          #          #
154          # this is really important so that when the classification class          # this is really important so that when the classification class
155          # tries to set its parent layer the variable will exist          # tries to set its parent layer the variable will exist
156          #          #
157          self.__classification = None          self.__classification = None
158          self.__setClassLock = False          self.__setClassLock = False
159    
160            self.SetShapeStore(data)
161    
162          self.SetClassification(None)          self.SetClassification(None)
163    
# Line 159  class Layer(BaseLayer): Line 168  class Layer(BaseLayer):
168    
169          self.UnsetModified()          self.UnsetModified()
170    
     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  
171    
172              # estimate a good depth for the quad tree. Each depth      def SetShapeStore(self, store):
173              # multiplies the number of nodes by four, therefore we          self.store = store
174              # basically take the base 4 logarithm of the number of          self.shapefile = self.store.Shapefile()
175              # shapes.          self.shapetable = self.store.Table()
176              if self.numshapes < 4:          self.filename = self.store.filename
177                  maxdepth = 1          self.table = self.shapetable
178              else:  
179                  maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))          numshapes, shapetype, mins, maxs = self.shapefile.info()
180            self.numshapes = numshapes
181            self.shapetype = shapelib_shapetypes[shapetype]
182    
183            # if there are shapes, set the bbox accordingly. Otherwise
184            # set it to None.
185            if self.numshapes:
186                self.bbox = mins[:2] + maxs[:2]
187            else:
188                self.bbox = None
189    
190              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,          # estimate a good depth for the quad tree. Each depth
191                                               maxdepth)          # 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):      def Destroy(self):
212          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
         if self.shapefile is not None:  
             self.shapefile.close()  
             self.shapefile = None  
             self.shapetree = None  
213          self.SetClassification(None)          self.SetClassification(None)
         self.table.Destroy()  
214    
215      def BoundingBox(self):      def BoundingBox(self):
216          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
# Line 216  class Layer(BaseLayer): Line 234  class Layer(BaseLayer):
234          else:          else:
235              return None              return None
236    
237      def GetFieldType(self, fieldName):      def ShapesBoundingBox(self, shapes):
238          info = self.table.field_info_by_name(fieldName)          """Return a bounding box in lat/long coordinates for the given
239          if info is not None:          list of shape ids.
240              return info[0]  
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:
252                inverse = lambda x, y: self.projection.Inverse(x, y)
253          else:          else:
254              return None              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"""
# Line 251  class Layer(BaseLayer): Line 299  class Layer(BaseLayer):
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
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))          return self.shapetree.find_shapes((left, bottom), (right, top))
311    
312      def SetProjection(self, projection):      def HasClassification(self):
313          """Set the layer's projection"""          return True
         self.projection = projection  
         self.changed(LAYER_PROJECTION_CHANGED, self)  
314    
315      def GetClassification(self):      def GetClassification(self):
316          return self.__classification          return self.__classification
# Line 312  class Layer(BaseLayer): Line 362  class Layer(BaseLayer):
362              items.append(_("Extent (lat-lon):"))              items.append(_("Extent (lat-lon):"))
363          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])          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)          items.append(self.__classification)
370    
371          return (_("Layer '%s'") % self.Title(), items)          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
392            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    
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