/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 412 by jonathan, Wed Feb 19 16:51:50 2003 UTC revision 961 by jonathan, Wed May 21 17:23:25 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]>  # Jonathan Coles <[email protected]>
# 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  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         LAYER_CHANGED
22    
23  from classification import Classification  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 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 102  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 = Color.None,                   fill = Color.Transparent,
131                   stroke = Color.Black,                   stroke = Color.Black,
132                   stroke_width = 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
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                                     visible = visible,
151                                     projection = projection)
152    
153            #
154            # this is really important so that when the classification class
155            # tries to set its parent layer the variable will exist
156            #
157            self.__classification = None
158            self.__setClassLock = False
159    
160          # Make the filename absolute. The filename will be          self.SetShapeStore(data)
         # 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)  
161    
162          self.projection = projection          self.SetClassification(None)
         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  
163    
164          self.__classification = Classification(self)          self.__classification.SetDefaultLineColor(stroke)
165          self.__classification.SetDefaultStroke(stroke)          self.__classification.SetDefaultLineWidth(lineWidth)
         self.__classification.SetDefaultStrokeWidth(stroke_width)  
166          self.__classification.SetDefaultFill(fill)          self.__classification.SetDefaultFill(fill)
167            self.__classification.SetLayer(self)
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            # 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              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,      def ShapeStore(self):
209                                               maxdepth)          return self.store
210    
211      def Destroy(self):      def Destroy(self):
212          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
213          if self.shapefile is not None:          self.SetClassification(None)
             self.shapefile.close()  
             self.shapefile = None  
             self.shapetree = 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.
217    
218          If the layer has no shapes, return None.          If the layer has no shapes, return None.
219          """          """
         # The bbox will be set by open_shapefile just as we need it  
         # here.  
         self.open_shapefile()  
220          return self.bbox          return self.bbox
221    
222      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
# Line 208  class Layer(BaseLayer): Line 234  class Layer(BaseLayer):
234          else:          else:
235              return None              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:
252                inverse = lambda x, y: self.projection.Inverse(x, y)
253            else:
254                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:
# Line 239  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
317    
318      def SetClassification(self, clazz):      def SetClassification(self, clazz):
319          self.__classification = clazz          """Set the classification to 'clazz'
320          self.changed(LAYER_LEGEND_CHANGED, self)  
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):      def TreeInfo(self):
350          items = []          items = []
351    
# Line 273  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            Throws IOError if the filename is invalid or points to a file that
389            is not in a format GDAL can use.
390            """
391    
392            BaseLayer.__init__(self, title, visible = visible)
393    
394            self.projection = projection
395            self.filename = filename
396    
397            self.bbox = -1
398    
399            #
400            # temporarily open the file so that GDAL can test if it's valid.
401            #
402            dataset = gdal.Open(self.filename, GA_ReadOnly)
403    
404            if dataset is None:
405                raise IOError()
406    
407            self.UnsetModified()
408    
409        def BoundingBox(self):
410            """Return the layer's bounding box in the intrinsic coordinate system.
411    
412            If the layer has no shapes, return None.
413            """
414            if self.bbox == -1:
415                dataset = gdal.Open(self.filename, GA_ReadOnly)
416                if dataset is None:
417                    self.bbox = None
418                else:
419                    geotransform = dataset.GetGeoTransform()
420                    if geotransform is None:
421                        return None
422    
423                    x = 0
424                    y = dataset.RasterYSize
425                    left = geotransform[0] +        \
426                           geotransform[1] * x +    \
427                           geotransform[2] * y
428    
429                    bottom = geotransform[3] +      \
430                             geotransform[4] * x +  \
431                             geotransform[5] * y
432    
433                    x = dataset.RasterXSize
434                    y = 0
435                    right = geotransform[0] +       \
436                            geotransform[1] * x +   \
437                            geotransform[2] * y
438    
439                    top = geotransform[3] +         \
440                          geotransform[4] * x +     \
441                          geotransform[5] * y
442    
443                    self.bbox = (left, bottom, right, top)
444    
445            return self.bbox
446    
447        def LatLongBoundingBox(self):
448            bbox = self.BoundingBox()
449            if bbox is None:
450                return None
451    
452            llx, lly, urx, ury = bbox
453            if self.projection is not None:
454                llx, lly = self.projection.Inverse(llx, lly)
455                urx, ury = self.projection.Inverse(urx, ury)
456    
457            return llx, lly, urx, ury
458    
459        def GetImageFilename(self):
460            return self.filename
461    
462        def TreeInfo(self):
463            items = []
464    
465            if self.Visible():
466                items.append(_("Shown"))
467            else:
468                items.append(_("Hidden"))
469            items.append(_("Shapes: %d") % self.NumShapes())
470    
471            bbox = self.LatLongBoundingBox()
472            if bbox is not None:
473                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
474            else:
475                items.append(_("Extent (lat-lon):"))
476    
477            if self.projection and len(self.projection.params) > 0:
478                items.append((_("Projection"),
479                            [str(param) for param in self.projection.params]))
480    
481            return (_("Layer '%s'") % self.Title(), items)
482    
Legend:
Removed from v.412  
changed lines
  Added in v.961
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