/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 143 by bh, Tue May 7 14:17:20 2002 UTC revision 1599 by bh, Mon Aug 18 12:45:28 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  import shapelib, shptree  import os
12    import warnings
13    
14  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from Thuban import _
      LAYER_VISIBILITY_CHANGED  
15    
16  from color import Color  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
17  # Some predefined colors for internal use       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED, CLASS_CHANGED
 _black = Color(0, 0, 0)  
18    
19    import classification
20    
21  from table import Table  from color import Transparent, Black
   
22  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
23    from data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT
24    
25  class Shape:  import resource
   
     """Represent one shape"""  
   
     def __init__(self, points):  
         self.points = points  
         #self.compute_bbox()  
   
     def compute_bbox(self):  
         xs = []  
         ys = []  
         for x, y in self.points:  
             xs.append(x)  
             ys.append(y)  
         self.llx = min(xs)  
         self.lly = min(ys)  
         self.urx = max(xs)  
         self.ury = max(ys)  
   
     def Points(self):  
         return self.points  
   
26    
27    
 # Shape type constants  
 SHAPETYPE_POLYGON = "polygon"  
 SHAPETYPE_ARC = "arc"  
 SHAPETYPE_POINT = "point"  
   
 # mapping from shapelib shapetype constants to our constants  
 shapelib_shapetypes = {shapelib.SHPT_POLYGON: SHAPETYPE_POLYGON,  
                        shapelib.SHPT_ARC: SHAPETYPE_ARC,  
                        shapelib.SHPT_POINT: SHAPETYPE_POINT}  
   
28  shapetype_names = {SHAPETYPE_POINT: "Point",  shapetype_names = {SHAPETYPE_POINT: "Point",
29                     SHAPETYPE_ARC: "Arc",                     SHAPETYPE_ARC: "Arc",
30                     SHAPETYPE_POLYGON: "Polygon"}                     SHAPETYPE_POLYGON: "Polygon"}
# Line 63  class BaseLayer(TitledObject, Modifiable Line 33  class BaseLayer(TitledObject, Modifiable
33    
34      """Base class for the layers."""      """Base class for the layers."""
35    
36      def __init__(self, title, visible = 1):      def __init__(self, title, visible = True, projection = None):
37          """Initialize the layer.          """Initialize the layer.
38    
39          title -- the title          title -- the title
# Line 72  class BaseLayer(TitledObject, Modifiable Line 42  class BaseLayer(TitledObject, Modifiable
42          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
43          Modifiable.__init__(self)          Modifiable.__init__(self)
44          self.visible = visible          self.visible = visible
45            self.projection = projection
46    
47      def Visible(self):      def Visible(self):
48          """Return true if layer is visible"""          """Return true if layer is visible"""
# Line 81  class BaseLayer(TitledObject, Modifiable Line 52  class BaseLayer(TitledObject, Modifiable
52          """Set the layer's visibility."""          """Set the layer's visibility."""
53          self.visible = visible          self.visible = visible
54          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
55            
56                def HasClassification(self):
57            """Determine if this layer support classifications."""
58            return False
59    
60        def HasShapes(self):
61            """Determine if this layer supports shapes."""
62            return False
63    
64        def GetProjection(self):
65            """Return the layer's projection."""
66            return self.projection
67    
68        def SetProjection(self, projection):
69            """Set the layer's projection"""
70            self.projection = projection
71            self.changed(LAYER_PROJECTION_CHANGED, self)
72    
73  class Layer(BaseLayer):  class Layer(BaseLayer):
74    
75      """Represent the information of one geodata file (currently a shapefile)      """Represent the information of one geodata file (currently a shapefile)
# Line 90  class Layer(BaseLayer): Line 77  class Layer(BaseLayer):
77      All children of the layer have the same type.      All children of the layer have the same type.
78    
79      A layer has fill and stroke colors. Colors should be instances of      A layer has fill and stroke colors. Colors should be instances of
80      Color. They can also be None, indicating no fill or no stroke.      Color. They can also be Transparent, indicating no fill or no stroke.
81    
82      The layer objects send the following events, all of which have the      The layer objects send the following events, all of which have the
83      layer object as parameter:      layer object as parameter:
84    
85          TITLE_CHANGED -- The title has changed.          TITLE_CHANGED -- The title has changed.
86          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
         LAYER_LEGEND_CHANGED -- the fill or stroke attributes have changed  
   
87      """      """
88    
89      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
90                   fill = None, stroke = _black, stroke_width = 1, visible = 1):                   fill = Transparent,
91                     stroke = Black,
92                     lineWidth = 1,
93                     visible = True):
94          """Initialize the layer.          """Initialize the layer.
95    
96          title -- the title          title -- the title
97          filename -- the name of the shapefile          data -- datastore object for the shape data shown by the layer
98          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
99                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
100                 coordinates                 coordinates
101          fill -- the fill color or None if the shapes are not filled          fill -- the fill color or Transparent if the shapes are
102          stroke -- the stroke color or None if the shapes are not stroked                  not filled
103            stroke -- the stroke color or Transparent if the shapes
104                    are not stroked
105          visible -- boolean. If true the layer is visible.          visible -- boolean. If true the layer is visible.
106    
107          colors are expected to be instances of Color class          colors are expected to be instances of Color class
108          """          """
109          BaseLayer.__init__(self, title, visible = visible)          BaseLayer.__init__(self, title,
110          self.filename = filename                                   visible = visible,
111          self.projection = projection                                   projection = projection)
112          self.fill = fill  
113          self.stroke = stroke          self.__classification = None
114          self.stroke_width = stroke_width          self.store = None
115          self.shapefile = None  
116          self.shapetree = None          self.SetShapeStore(data)
117          self.open_shapefile()  
118          # shapetable is the table associated with the shapefile, while          self.classification_column = None
119          # table is the default table used to look up attributes for          self.SetClassificationColumn(None)
120          # display          self.SetClassification(None)
121          self.shapetable = Table(filename)  
122          self.table = self.shapetable          self.__classification.SetDefaultLineColor(stroke)
123            self.__classification.SetDefaultLineWidth(lineWidth)
124      def open_shapefile(self):          self.__classification.SetDefaultFill(fill)
125          if self.shapefile is None:  
126              self.shapefile = shapelib.ShapeFile(self.filename)          self.UnsetModified()
127              numshapes, shapetype, mins, maxs = self.shapefile.info()  
128              self.numshapes = numshapes      def __getattr__(self, attr):
129              self.shapetype = shapelib_shapetypes[shapetype]          """Access to some attributes for backwards compatibility
130              self.bbox = mins[:2] + maxs[:2]  
131              #print "building tree for", self.filename, "..."          The attributes implemented here are now held by the shapestore
132              self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2, 0)          if at all. For backwards compatibility pretend that they are
133              #print "done"          still there but issue a DeprecationWarning when they are
134            accessed.
135            """
136            if attr in ("table", "shapetable"):
137                value = self.store.Table()
138            elif attr == "shapefile":
139                value = self.store.Shapefile()
140            elif attr == "filename":
141                value = self.store.FileName()
142            else:
143                raise AttributeError, attr
144            warnings.warn("The Layer attribute %r is deprecated."
145                          " It's value can be accessed through the shapestore"
146                          % attr, DeprecationWarning, stacklevel = 2)
147            return value
148    
149        def SetShapeStore(self, store):
150            # Set the classification to None if there is a classification
151            # and the new shapestore doesn't have a table with a suitable
152            # column, i.e one with the same name and type as before
153            # FIXME: Maybe we should keep it the same if the type is
154            # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
155            if self.__classification is not None:
156                columnname = self.classification_column
157                columntype = self.GetFieldType(columnname)
158                table = store.Table()
159                if (columnname is not None
160                    and (not table.HasColumn(columnname)
161                         or table.Column(columnname).type != columntype)):
162                    self.SetClassification(None)
163    
164            self.store = store
165    
166            self.changed(LAYER_SHAPESTORE_REPLACED, self)
167    
168        def ShapeStore(self):
169            return self.store
170    
171        def Destroy(self):
172            BaseLayer.Destroy(self)
173            if self.__classification is not None:
174                self.__classification.Unsubscribe(CLASS_CHANGED,
175                                                  self._classification_changed)
176    
177      def BoundingBox(self):      def BoundingBox(self):
178          """Return the bounding box of the layer's shapes in their default          """Return the layer's bounding box in the intrinsic coordinate system.
179          coordinate system"""  
180          self.open_shapefile()          If the layer has no shapes, return None.
181          return self.bbox          """
182            return self.store.BoundingBox()
183    
184      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
185          """Return the layer's bounding box in lat/long coordinates"""          """Return the layer's bounding box in lat/long coordinates.
186          llx, lly, urx, ury = self.BoundingBox()  
187            Return None, if the layer doesn't contain any shapes.
188            """
189            bbox = self.BoundingBox()
190            if bbox is not None:
191                llx, lly, urx, ury = bbox
192                if self.projection is not None:
193                    llx, lly = self.projection.Inverse(llx, lly)
194                    urx, ury = self.projection.Inverse(urx, ury)
195                return llx, lly, urx, ury
196            else:
197                return None
198    
199        def ShapesBoundingBox(self, shapes):
200            """Return a bounding box in lat/long coordinates for the given
201            list of shape ids.
202    
203            If shapes is None or empty, return None.
204            """
205    
206            if shapes is None or len(shapes) == 0: return None
207    
208            llx = []
209            lly = []
210            urx = []
211            ury = []
212    
213          if self.projection is not None:          if self.projection is not None:
214              llx, lly = self.projection.Inverse(llx, lly)              inverse = lambda x, y: self.projection.Inverse(x, y)
215              urx, ury = self.projection.Inverse(urx, ury)          else:
216          return llx, lly, urx, ury              inverse = lambda x, y: (x, y)
217    
218            for id in shapes:
219                left, bottom, right, top = self.Shape(id).compute_bbox()
220    
221                left, bottom = inverse(left, bottom)
222                right, top   = inverse(right, top)
223    
224                llx.append(left)
225                lly.append(bottom)
226                urx.append(right)
227                ury.append(top)
228    
229            return (min(llx), min(lly), max(urx), max(ury))
230    
231        def GetFieldType(self, fieldName):
232            if self.store:
233                table = self.store.Table()
234                if table.HasColumn(fieldName):
235                    return table.Column(fieldName).type
236            return None
237    
238        def HasShapes(self):
239            return True
240    
241      def NumShapes(self):      def NumShapes(self):
242          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
243          self.open_shapefile()          return self.store.NumShapes()
         return self.numshapes  
244    
245      def ShapeType(self):      def ShapeType(self):
246          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
247          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.  
248            The return value is one of the SHAPETYPE_* constants defined in
249            Thuban.Model.data.
250          """          """
251          self.open_shapefile()          return self.store.ShapeType()
         return self.shapetype  
252    
253      def Shape(self, index):      def Shape(self, index):
254          """Return the shape with index index"""          """Return the shape with index index"""
255          self.open_shapefile()          return self.store.Shape(index)
256          shape = self.shapefile.read_object(index)  
257          if self.shapetype == SHAPETYPE_POINT:      def ShapesInRegion(self, bbox):
258              points = shape.vertices()          """Return an iterable over the shapes that overlap the bounding box.
259          else:  
260              #for poly in shape.vertices():          The bbox parameter should be the bounding box as a tuple in the
261              poly = shape.vertices()[0]          form (minx, miny, maxx, maxy) in unprojected coordinates.
262              points = []          """
263              for x, y in poly:          if self.projection is not None:
264                  points.append((x, y))              left, bottom, right, top = bbox
265          return Shape(points)              xs = []; ys = []
266                for x, y in [(left, bottom), (left, top), (right, top),
267      def ShapesInRegion(self, box):                           (right, bottom)]:
268          """Return the ids of the shapes that overlap the box.                  x, y = self.projection.Forward(x, y)
269                    xs.append(x)
270          Box is a tuple (left, bottom, right, top) in the coordinate                  ys.append(y)
271          system used by the layer's shapefile.              bbox = (min(xs), min(ys), max(xs), max(ys))
272          """  
273          left, bottom, right, top = box          return self.store.ShapesInRegion(bbox)
274          import time  
275          start = time.time()      def GetClassificationColumn(self):
276          ids = self.shapetree.find_shapes((left, bottom), (right, top))          return self.classification_column
277          print "ShapesInRegion", time.time() - start  
278          return ids      def SetClassificationColumn(self, column):
279            """Set the column to classifiy on, or None. If column is not None
280            and the column does not exist in the table, raise a ValueError.
281            """
282            if column:
283                columnType = self.GetFieldType(column)
284                if columnType is None:
285                    raise ValueError()
286            changed = self.classification_column != column
287            self.classification_column = column
288            if changed:
289                self.changed(LAYER_CHANGED, self)
290    
291        def HasClassification(self):
292            return True
293    
294        def GetClassification(self):
295            return self.__classification
296    
297        def SetClassification(self, clazz):
298            """Set the classification used by this layer to 'clazz'
299    
300            If 'clazz' is None a default classification is created.
301    
302            This issues a LAYER_CHANGED event.
303            """
304    
305            if self.__classification is not None:
306                self.__classification.Unsubscribe(CLASS_CHANGED,
307                                                  self._classification_changed)
308    
309            if clazz is None:
310                clazz = classification.Classification()
311    
312            self.__classification = clazz
313            self.__classification.Subscribe(CLASS_CHANGED,
314                                            self._classification_changed)
315    
316            self._classification_changed()
317    
318        def _classification_changed(self):
319            """Called from the classification object when it has changed."""
320            self.changed(LAYER_CHANGED, self)
321    
322        def TreeInfo(self):
323            items = []
324    
325            items.append(_("Filename: %s") % self.ShapeStore().FileName())
326    
327            if self.Visible():
328                items.append(_("Shown"))
329            else:
330                items.append(_("Hidden"))
331            items.append(_("Shapes: %d") % self.NumShapes())
332    
333            bbox = self.LatLongBoundingBox()
334            if bbox is not None:
335                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
336            else:
337                items.append(_("Extent (lat-lon):"))
338            items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
339    
340            if self.projection and len(self.projection.params) > 0:
341                items.append((_("Projection"),
342                            [str(param) for param in self.projection.params]))
343    
344            items.append(self.__classification)
345    
346            return (_("Layer '%s'") % self.Title(), items)
347    
348    
349    if resource.has_gdal_support():
350        import gdal
351        from gdalconst import GA_ReadOnly
352    
353    class RasterLayer(BaseLayer):
354    
355        def __init__(self, title, filename, projection = None, visible = True):
356            """Initialize the Raster Layer.
357    
358            title -- title for the layer.
359    
360            filename -- file name of the source image.
361    
362            projection -- Projection object describing the projection which
363                          the source image is in.
364    
365            visible -- True is the layer should initially be visible.
366    
367            Throws IOError if the filename is invalid or points to a file that
368            is not in a format GDAL can use.
369            """
370    
371            BaseLayer.__init__(self, title, visible = visible)
372    
     def SetProjection(self, projection):  
         """Set the layer's projection"""  
373          self.projection = projection          self.projection = projection
374          self.changed(LAYER_PROJECTION_CHANGED, self)          self.filename = os.path.abspath(filename)
375    
376            self.bbox = -1
377    
378            if resource.has_gdal_support():
379                #
380                # temporarily open the file so that GDAL can test if it's valid.
381                #
382                dataset = gdal.Open(self.filename, GA_ReadOnly)
383    
384                if dataset is None:
385                    raise IOError()
386    
387            self.UnsetModified()
388    
389        def BoundingBox(self):
390            """Return the layer's bounding box in the intrinsic coordinate system.
391    
392            If the there is no support for images, or the file cannot
393            be read, or there is no geographics information available, return None.
394            """
395            if not resource.has_gdal_support():
396                return None
397    
398            if self.bbox == -1:
399                dataset = gdal.Open(self.filename, GA_ReadOnly)
400                if dataset is None:
401                    self.bbox = None
402                else:
403                    geotransform = dataset.GetGeoTransform()
404                    if geotransform is None:
405                        return None
406    
407                    x = 0
408                    y = dataset.RasterYSize
409                    left = geotransform[0] +        \
410                           geotransform[1] * x +    \
411                           geotransform[2] * y
412    
413                    bottom = geotransform[3] +      \
414                             geotransform[4] * x +  \
415                             geotransform[5] * y
416    
417                    x = dataset.RasterXSize
418                    y = 0
419                    right = geotransform[0] +       \
420                            geotransform[1] * x +   \
421                            geotransform[2] * y
422    
423                    top = geotransform[3] +         \
424                          geotransform[4] * x +     \
425                          geotransform[5] * y
426    
427                    self.bbox = (left, bottom, right, top)
428    
429            return self.bbox
430    
431        def LatLongBoundingBox(self):
432            bbox = self.BoundingBox()
433            if bbox is None:
434                return None
435    
436            llx, lly, urx, ury = bbox
437            if self.projection is not None:
438                llx, lly = self.projection.Inverse(llx, lly)
439                urx, ury = self.projection.Inverse(urx, ury)
440    
441            return llx, lly, urx, ury
442    
443        def GetImageFilename(self):
444            return self.filename
445    
446        def TreeInfo(self):
447            items = []
448    
449            items.append(_("Filename: %s") % self.GetImageFilename())
450    
451            if self.Visible():
452                items.append(_("Shown"))
453            else:
454                items.append(_("Hidden"))
455    
456            bbox = self.LatLongBoundingBox()
457            if bbox is not None:
458                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
459            else:
460                items.append(_("Extent (lat-lon):"))
461    
462            if self.projection and len(self.projection.params) > 0:
463                items.append((_("Projection"),
464                            [str(param) for param in self.projection.params]))
465    
466            return (_("Layer '%s'") % self.Title(), items)
467    
     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.1599
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