/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 6 by bh, Tue Aug 28 15:41:52 2001 UTC revision 1086 by jan, Wed May 28 11:36:05 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001 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  from math import log, ceil
12    
13  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  from Thuban import _
      LAYER_VISIBILITY_CHANGED  
14    
15  from color import Color  import shapelib, shptree
16  # Some predefined colors for internal use  
17  _black = Color(0, 0, 0)  import gdal
18    from gdalconst import GA_ReadOnly
19    
20    from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
21         LAYER_CHANGED
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, 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.shapefile = None          # this is really important so that when the classification class
155          # shapetable is the table associated with the shapefile, while          # tries to set its parent layer the variable will exist
156          # table is the default table used to look up attributes for          #
157          # display          self.__classification = None
158          self.shapetable = Table(filename)          self.__setClassLock = False
159    
160            self.SetShapeStore(data)
161    
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            if hasattr(self.store, "FileName"):
177                self.filename = self.store.FileName()
178          self.table = self.shapetable          self.table = self.shapetable
179    
180      def open_shapefile(self):          numshapes, shapetype, mins, maxs = self.shapefile.info()
181          if self.shapefile is None:          self.numshapes = numshapes
182              self.shapefile = shapelib.ShapeFile(self.filename)          self.shapetype = shapelib_shapetypes[shapetype]
183              numshapes, shapetype, mins, maxs = self.shapefile.info()  
184              self.numshapes = numshapes          # if there are shapes, set the bbox accordingly. Otherwise
185              self.shapetype = shapelib_shapetypes[shapetype]          # set it to None.
186            if self.numshapes:
187              self.bbox = mins[:2] + maxs[:2]              self.bbox = mins[:2] + maxs[:2]
188            else:
189                self.bbox = None
190    
191            # estimate a good depth for the quad tree. Each depth
192            # multiplies the number of nodes by four, therefore we
193            # basically take the base 4 logarithm of the number of
194            # shapes.
195            if self.numshapes < 4:
196                maxdepth = 1
197            else:
198                maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))
199    
200            self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
201                                             maxdepth)
202            if self.__classification is not None:
203                fieldname = self.__classification.GetField()
204                if fieldname is not None and \
205                   not self.store.Table().HasColumn(fieldname):
206                    self.SetClassification(None)
207            self.changed(LAYER_CHANGED, self)
208    
209        def ShapeStore(self):
210            return self.store
211    
212        def Destroy(self):
213            BaseLayer.Destroy(self)
214            self.SetClassification(None)
215    
216      def BoundingBox(self):      def BoundingBox(self):
217          """Return the bounding box of the layer's shapes in their default          """Return the layer's bounding box in the intrinsic coordinate system.
218          coordinate system"""  
219          self.open_shapefile()          If the layer has no shapes, return None.
220            """
221          return self.bbox          return self.bbox
222    
223      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
224          """Return the layer's bounding box in lat/long coordinates"""          """Return the layer's bounding box in lat/long coordinates.
225          llx, lly, urx, ury = self.BoundingBox()  
226            Return None, if the layer doesn't contain any shapes.
227            """
228            bbox = self.BoundingBox()
229            if bbox is not None:
230                llx, lly, urx, ury = bbox
231                if self.projection is not None:
232                    llx, lly = self.projection.Inverse(llx, lly)
233                    urx, ury = self.projection.Inverse(urx, ury)
234                return llx, lly, urx, ury
235            else:
236                return None
237    
238        def ShapesBoundingBox(self, shapes):
239            """Return a bounding box in lat/long coordinates for the given
240            list of shape ids.
241    
242            If shapes is None or empty, return None.
243            """
244    
245            if shapes is None or len(shapes) == 0: return None
246    
247            llx = []
248            lly = []
249            urx = []
250            ury = []
251    
252          if self.projection is not None:          if self.projection is not None:
253              llx, lly = self.projection.Inverse(llx, lly)              inverse = lambda x, y: self.projection.Inverse(x, y)
254              urx, ury = self.projection.Inverse(urx, ury)          else:
255          return llx, lly, urx, ury              inverse = lambda x, y: (x, y)
256    
257            for id in shapes:
258                left, bottom, right, top = self.Shape(id).compute_bbox()
259    
260                left, bottom = inverse(left, bottom)
261                right, top   = inverse(right, top)
262    
263                llx.append(left)
264                lly.append(bottom)
265                urx.append(right)
266                ury.append(top)
267    
268            return (min(llx), min(lly), max(urx), max(ury))
269    
270        def GetFieldType(self, fieldName):
271            if self.table.HasColumn(fieldName):
272                return self.table.Column(fieldName).type
273            return None
274    
275      def NumShapes(self):      def NumShapes(self):
276          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
277          return self.numshapes          return self.numshapes
278    
279      def ShapeType(self):      def ShapeType(self):
280          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
281          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
282          """          """
         self.open_shapefile()  
283          return self.shapetype          return self.shapetype
284    
285      def Shape(self, index):      def Shape(self, index):
286          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
287          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
288    
289          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
290              points = shape.vertices()              points = shape.vertices()
291          else:          else:
# Line 173  class Layer(BaseLayer): Line 293  class Layer(BaseLayer):
293              poly = shape.vertices()[0]              poly = shape.vertices()[0]
294              points = []              points = []
295              for x, y in poly:              for x, y in poly:
296                  points.append(x, y)                  points.append((x, y))
297    
298          return Shape(points)          return Shape(points)
299    
300      def SetProjection(self, projection):      def ShapesInRegion(self, box):
301          """Set the layer's projection"""          """Return the ids of the shapes that overlap the box.
302    
303            Box is a tuple (left, bottom, right, top) in unprojected coordinates.
304            """
305            left, bottom, right, top = box
306    
307            if self.projection is not None:
308                left,  bottom = self.projection.Forward(left, bottom)
309                right, top    = self.projection.Forward(right, top)
310    
311            return self.shapetree.find_shapes((left, bottom), (right, top))
312    
313        def HasClassification(self):
314            return True
315    
316        def GetClassification(self):
317            return self.__classification
318    
319        def SetClassification(self, clazz):
320            """Set the classification to 'clazz'
321    
322            If 'clazz' is None a default classification is created
323            """
324    
325            # prevent infinite recursion when calling SetLayer()
326            if self.__setClassLock: return
327    
328            self.__setClassLock = True
329    
330            if clazz is None:
331                if self.__classification is not None:
332                    self.__classification.SetLayer(None)
333                self.__classification = classification.Classification()
334            else:
335                self.__classification = clazz
336                try:
337                    self.__classification.SetLayer(self)
338                except ValueError:
339                    self.__setClassLock = False
340                    raise ValueError
341    
342            self.changed(LAYER_CHANGED, self)
343    
344            self.__setClassLock = False
345    
346        def ClassChanged(self):
347            """Called from the classification object when it has changed."""
348            self.changed(LAYER_CHANGED, self)
349    
350        def TreeInfo(self):
351            items = []
352    
353            if hasattr(self, 'filename'):
354                items.append(_("Filename: %s") % self.filename)
355    
356            if self.Visible():
357                items.append(_("Shown"))
358            else:
359                items.append(_("Hidden"))
360            items.append(_("Shapes: %d") % self.NumShapes())
361    
362            bbox = self.LatLongBoundingBox()
363            if bbox is not None:
364                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
365            else:
366                items.append(_("Extent (lat-lon):"))
367            items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
368    
369            if self.projection and len(self.projection.params) > 0:
370                items.append((_("Projection"),
371                            [str(param) for param in self.projection.params]))
372    
373            items.append(self.__classification)
374    
375            return (_("Layer '%s'") % self.Title(), items)
376    
377    
378    class RasterLayer(BaseLayer):
379    
380        def __init__(self, title, filename, projection = None, visible = True):
381            """Initialize the Raster Layer.
382    
383            title -- title for the layer.
384    
385            filename -- file name of the source image.
386    
387            projection -- Projection object describing the projection which
388                          the source image is in.
389    
390            visible -- True is the layer should initially be visible.
391    
392            Throws IOError if the filename is invalid or points to a file that
393            is not in a format GDAL can use.
394            """
395    
396            BaseLayer.__init__(self, title, visible = visible)
397    
398          self.projection = projection          self.projection = projection
399          self.changed(LAYER_PROJECTION_CHANGED, self)          self.filename = filename
400    
401            self.bbox = -1
402    
403            #
404            # temporarily open the file so that GDAL can test if it's valid.
405            #
406            dataset = gdal.Open(self.filename, GA_ReadOnly)
407    
408            if dataset is None:
409                raise IOError()
410    
411            self.UnsetModified()
412    
413        def BoundingBox(self):
414            """Return the layer's bounding box in the intrinsic coordinate system.
415    
416            If the layer has no shapes, return None.
417            """
418            if self.bbox == -1:
419                dataset = gdal.Open(self.filename, GA_ReadOnly)
420                if dataset is None:
421                    self.bbox = None
422                else:
423                    geotransform = dataset.GetGeoTransform()
424                    if geotransform is None:
425                        return None
426    
427                    x = 0
428                    y = dataset.RasterYSize
429                    left = geotransform[0] +        \
430                           geotransform[1] * x +    \
431                           geotransform[2] * y
432    
433                    bottom = geotransform[3] +      \
434                             geotransform[4] * x +  \
435                             geotransform[5] * y
436    
437                    x = dataset.RasterXSize
438                    y = 0
439                    right = geotransform[0] +       \
440                            geotransform[1] * x +   \
441                            geotransform[2] * y
442    
443                    top = geotransform[3] +         \
444                          geotransform[4] * x +     \
445                          geotransform[5] * y
446    
447                    self.bbox = (left, bottom, right, top)
448    
449            return self.bbox
450    
451        def LatLongBoundingBox(self):
452            bbox = self.BoundingBox()
453            if bbox is None:
454                return None
455    
456            llx, lly, urx, ury = bbox
457            if self.projection is not None:
458                llx, lly = self.projection.Inverse(llx, lly)
459                urx, ury = self.projection.Inverse(urx, ury)
460    
461            return llx, lly, urx, ury
462    
463        def GetImageFilename(self):
464            return self.filename
465    
466        def TreeInfo(self):
467            items = []
468    
469            if self.Visible():
470                items.append(_("Shown"))
471            else:
472                items.append(_("Hidden"))
473            items.append(_("Shapes: %d") % self.NumShapes())
474    
475            bbox = self.LatLongBoundingBox()
476            if bbox is not None:
477                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
478            else:
479                items.append(_("Extent (lat-lon):"))
480    
481            if self.projection and len(self.projection.params) > 0:
482                items.append((_("Projection"),
483                            [str(param) for param in self.projection.params]))
484    
485            return (_("Layer '%s'") % self.Title(), items)
486    
     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)  
Legend:
Removed from v.6  
changed lines
  Added in v.1086
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