/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 364 by jonathan, Mon Jan 27 11:47:12 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]>
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    
 import os  
11  from math import log, ceil  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 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 32  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 44  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 67  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 76  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 86  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 101  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                                     visible = visible,
151          # Make the filename absolute. The filename will be                                   projection = projection)
152          # interpreted relative to that anyway, but when saving a  
153          # session we need to compare absolute paths and it's usually          #
154          # safer to always work with absolute paths.          # this is really important so that when the classification class
155          self.filename = os.path.abspath(filename)          # tries to set its parent layer the variable will exist
156            #
157          self.projection = projection          self.__classification = None
158          self.fill = fill          self.__setClassLock = False
159          self.stroke = stroke  
160          self.stroke_width = stroke_width          self.SetShapeStore(data)
161          self.shapefile = None  
162          self.shapetree = None          self.SetClassification(None)
163          self.open_shapefile()  
164          # shapetable is the table associated with the shapefile, while          self.__classification.SetDefaultLineColor(stroke)
165          # table is the default table used to look up attributes for          self.__classification.SetDefaultLineWidth(lineWidth)
166          # display          self.__classification.SetDefaultFill(fill)
167          self.shapetable = Table(filename)          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          self.classification = Classification()          numshapes, shapetype, mins, maxs = self.shapefile.info()
180          self.classification.setNull(          self.numshapes = numshapes
181              {'stroke':stroke, 'stroke_width':stroke_width, 'fill':fill})          self.shapetype = shapelib_shapetypes[shapetype]
182    
183      def open_shapefile(self):          # if there are shapes, set the bbox accordingly. Otherwise
184          if self.shapefile is None:          # set it to None.
185              self.shapefile = shapelib.ShapeFile(self.filename)          if self.numshapes:
186              numshapes, shapetype, mins, maxs = self.shapefile.info()              self.bbox = mins[:2] + maxs[:2]
187              self.numshapes = numshapes          else:
188              self.shapetype = shapelib_shapetypes[shapetype]              self.bbox = None
   
             # 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  
189    
190              # estimate a good depth for the quad tree. Each depth          # estimate a good depth for the quad tree. Each depth
191              # multiplies the number of nodes by four, therefore we          # multiplies the number of nodes by four, therefore we
192              # basically take the base 4 logarithm of the number of          # basically take the base 4 logarithm of the number of
193              # shapes.          # shapes.
194              if self.numshapes < 4:          if self.numshapes < 4:
195                  maxdepth = 1              maxdepth = 1
196              else:          else:
197                  maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))              maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
198    
199              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,          self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
200                                               maxdepth)                                           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)
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 204  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 235  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
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            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          self.projection = projection
395          self.changed(LAYER_PROJECTION_CHANGED, self)          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      def SetFill(self, fill):          llx, lly, urx, ury = bbox
453          """Set the layer's fill color. None means the shapes are not filled"""          if self.projection is not None:
454          self.fill = fill              llx, lly = self.projection.Inverse(llx, lly)
455          self.changed(LAYER_LEGEND_CHANGED, self)              urx, ury = self.projection.Inverse(urx, ury)
456    
457      def SetStroke(self, stroke):          return llx, lly, urx, ury
458          """Set the layer's stroke color. None means the shapes are not  
459          stroked."""      def GetImageFilename(self):
460          self.stroke = stroke          return self.filename
         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)  
461    
462      def TreeInfo(self):      def TreeInfo(self):
463          items = []          items = []
464    
465          if self.Visible():          if self.Visible():
466              items.append("Shown")              items.append(_("Shown"))
467          else:          else:
468              items.append("Hidden")              items.append(_("Hidden"))
469          items.append("Shapes: %d" % self.NumShapes())          items.append(_("Shapes: %d") % self.NumShapes())
470    
471          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
472          if bbox is not None:          if bbox is not None:
473              items.append("Extent (lat-lon): (%g, %g, %g, %g)" % bbox)              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
474          else:          else:
475              items.append("Extent (lat-lon):")              items.append(_("Extent (lat-lon):"))
476          items.append("Shapetype: %s" % shapetype_names[self.ShapeType()])  
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          def color_string(color):          return (_("Layer '%s'") % self.Title(), items)
             if color is None:  
                 return "None"  
             return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue)  
         items.append("Fill: " + color_string(self.fill))  
         items.append("Outline: " + color_string(self.stroke))  
482    
         return ("Layer '%s'" % self.Title(), items)  
Legend:
Removed from v.364  
changed lines
  Added in v.961
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