/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 82 by bh, Fri Feb 15 17:11:04 2002 UTC revision 1117 by bh, Fri May 30 18:31:19 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  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, 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          self.filename = filename                                   visible = visible,
151          self.projection = projection                                   projection = projection)
152          self.fill = fill  
153          self.stroke = stroke          #
154          self.stroke_width = stroke_width          # this is really important so that when the classification class
155          self.shapefile = None          # tries to set its parent layer the variable will exist
156          self.open_shapefile()          #
157          # shapetable is the table associated with the shapefile, while          self.__classification = None
158          # table is the default table used to look up attributes for          self.__setClassLock = False
159          # display  
160          self.shapetable = Table(filename)          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            # Set the classification to None if there is a classification
203            # and the new shapestore doesn't have a table with a suitable
204            # column, i.e one with the same name and type as before
205            # FIXME: Maybe we should keep it the same if the type is
206            # compatible enough such as FIELDTYPE_DOUBLE and FIELDTYPE_INT
207            if self.__classification is not None:
208                fieldname = self.__classification.GetField()
209                fieldtype = self.__classification.GetFieldType()
210                table = self.store.Table()
211                if (fieldname is not None
212                    and (not table.HasColumn(fieldname)
213                         or table.Column(fieldname).type != fieldtype)):
214                    self.SetClassification(None)
215            self.changed(LAYER_CHANGED, self)
216    
217        def ShapeStore(self):
218            return self.store
219    
220        def Destroy(self):
221            BaseLayer.Destroy(self)
222            self.SetClassification(None)
223            self.store = self.shapetree = None
224            self.table = self.shapefile = self.shapetable = None
225    
226      def BoundingBox(self):      def BoundingBox(self):
227          """Return the bounding box of the layer's shapes in their default          """Return the layer's bounding box in the intrinsic coordinate system.
228          coordinate system"""  
229          self.open_shapefile()          If the layer has no shapes, return None.
230            """
231          return self.bbox          return self.bbox
232    
233      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
234          """Return the layer's bounding box in lat/long coordinates"""          """Return the layer's bounding box in lat/long coordinates.
235          llx, lly, urx, ury = self.BoundingBox()  
236            Return None, if the layer doesn't contain any shapes.
237            """
238            bbox = self.BoundingBox()
239            if bbox is not None:
240                llx, lly, urx, ury = bbox
241                if self.projection is not None:
242                    llx, lly = self.projection.Inverse(llx, lly)
243                    urx, ury = self.projection.Inverse(urx, ury)
244                return llx, lly, urx, ury
245            else:
246                return None
247    
248        def ShapesBoundingBox(self, shapes):
249            """Return a bounding box in lat/long coordinates for the given
250            list of shape ids.
251    
252            If shapes is None or empty, return None.
253            """
254    
255            if shapes is None or len(shapes) == 0: return None
256    
257            llx = []
258            lly = []
259            urx = []
260            ury = []
261    
262          if self.projection is not None:          if self.projection is not None:
263              llx, lly = self.projection.Inverse(llx, lly)              inverse = lambda x, y: self.projection.Inverse(x, y)
264              urx, ury = self.projection.Inverse(urx, ury)          else:
265          return llx, lly, urx, ury              inverse = lambda x, y: (x, y)
266    
267            for id in shapes:
268                left, bottom, right, top = self.Shape(id).compute_bbox()
269    
270                left, bottom = inverse(left, bottom)
271                right, top   = inverse(right, top)
272    
273                llx.append(left)
274                lly.append(bottom)
275                urx.append(right)
276                ury.append(top)
277    
278            return (min(llx), min(lly), max(urx), max(ury))
279    
280        def GetFieldType(self, fieldName):
281            if self.table.HasColumn(fieldName):
282                return self.table.Column(fieldName).type
283            return None
284    
285      def NumShapes(self):      def NumShapes(self):
286          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
287          return self.numshapes          return self.numshapes
288    
289      def ShapeType(self):      def ShapeType(self):
290          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
291          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
292          """          """
         self.open_shapefile()  
293          return self.shapetype          return self.shapetype
294    
295      def Shape(self, index):      def Shape(self, index):
296          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
297          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
298    
299          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
300              points = shape.vertices()              points = shape.vertices()
301          else:          else:
# Line 176  class Layer(BaseLayer): Line 304  class Layer(BaseLayer):
304              points = []              points = []
305              for x, y in poly:              for x, y in poly:
306                  points.append((x, y))                  points.append((x, y))
307    
308          return Shape(points)          return Shape(points)
309    
310      def SetProjection(self, projection):      def ShapesInRegion(self, box):
311          """Set the layer's projection"""          """Return the ids of the shapes that overlap the box.
312    
313            Box is a tuple (left, bottom, right, top) in unprojected coordinates.
314            """
315            left, bottom, right, top = box
316    
317            if self.projection is not None:
318                left,  bottom = self.projection.Forward(left, bottom)
319                right, top    = self.projection.Forward(right, top)
320    
321            return self.shapetree.find_shapes((left, bottom), (right, top))
322    
323        def HasClassification(self):
324            return True
325    
326        def GetClassification(self):
327            return self.__classification
328    
329        def SetClassification(self, clazz):
330            """Set the classification to 'clazz'
331    
332            If 'clazz' is None a default classification is created
333            """
334    
335            # prevent infinite recursion when calling SetLayer()
336            if self.__setClassLock: return
337    
338            self.__setClassLock = True
339    
340            if clazz is None:
341                if self.__classification is not None:
342                    self.__classification.SetLayer(None)
343                self.__classification = classification.Classification()
344            else:
345                self.__classification = clazz
346                try:
347                    self.__classification.SetLayer(self)
348                except ValueError:
349                    self.__setClassLock = False
350                    raise ValueError
351    
352            self.changed(LAYER_CHANGED, self)
353    
354            self.__setClassLock = False
355    
356        def ClassChanged(self):
357            """Called from the classification object when it has changed."""
358            self.changed(LAYER_CHANGED, self)
359    
360        def TreeInfo(self):
361            items = []
362    
363            if hasattr(self, 'filename'):
364                items.append(_("Filename: %s") % self.filename)
365    
366            if self.Visible():
367                items.append(_("Shown"))
368            else:
369                items.append(_("Hidden"))
370            items.append(_("Shapes: %d") % self.NumShapes())
371    
372            bbox = self.LatLongBoundingBox()
373            if bbox is not None:
374                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
375            else:
376                items.append(_("Extent (lat-lon):"))
377            items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
378    
379            if self.projection and len(self.projection.params) > 0:
380                items.append((_("Projection"),
381                            [str(param) for param in self.projection.params]))
382    
383            items.append(self.__classification)
384    
385            return (_("Layer '%s'") % self.Title(), items)
386    
387    
388    class RasterLayer(BaseLayer):
389    
390        def __init__(self, title, filename, projection = None, visible = True):
391            """Initialize the Raster Layer.
392    
393            title -- title for the layer.
394    
395            filename -- file name of the source image.
396    
397            projection -- Projection object describing the projection which
398                          the source image is in.
399    
400            visible -- True is the layer should initially be visible.
401    
402            Throws IOError if the filename is invalid or points to a file that
403            is not in a format GDAL can use.
404            """
405    
406            BaseLayer.__init__(self, title, visible = visible)
407    
408          self.projection = projection          self.projection = projection
409          self.changed(LAYER_PROJECTION_CHANGED, self)          self.filename = filename
410    
411            self.bbox = -1
412    
413            #
414            # temporarily open the file so that GDAL can test if it's valid.
415            #
416            dataset = gdal.Open(self.filename, GA_ReadOnly)
417    
418            if dataset is None:
419                raise IOError()
420    
421            self.UnsetModified()
422    
423        def BoundingBox(self):
424            """Return the layer's bounding box in the intrinsic coordinate system.
425    
426            If the layer has no shapes, return None.
427            """
428            if self.bbox == -1:
429                dataset = gdal.Open(self.filename, GA_ReadOnly)
430                if dataset is None:
431                    self.bbox = None
432                else:
433                    geotransform = dataset.GetGeoTransform()
434                    if geotransform is None:
435                        return None
436    
437                    x = 0
438                    y = dataset.RasterYSize
439                    left = geotransform[0] +        \
440                           geotransform[1] * x +    \
441                           geotransform[2] * y
442    
443                    bottom = geotransform[3] +      \
444                             geotransform[4] * x +  \
445                             geotransform[5] * y
446    
447                    x = dataset.RasterXSize
448                    y = 0
449                    right = geotransform[0] +       \
450                            geotransform[1] * x +   \
451                            geotransform[2] * y
452    
453                    top = geotransform[3] +         \
454                          geotransform[4] * x +     \
455                          geotransform[5] * y
456    
457                    self.bbox = (left, bottom, right, top)
458    
459            return self.bbox
460    
461        def LatLongBoundingBox(self):
462            bbox = self.BoundingBox()
463            if bbox is None:
464                return None
465    
466            llx, lly, urx, ury = bbox
467            if self.projection is not None:
468                llx, lly = self.projection.Inverse(llx, lly)
469                urx, ury = self.projection.Inverse(urx, ury)
470    
471            return llx, lly, urx, ury
472    
473        def GetImageFilename(self):
474            return self.filename
475    
476        def TreeInfo(self):
477            items = []
478    
479            if self.Visible():
480                items.append(_("Shown"))
481            else:
482                items.append(_("Hidden"))
483            items.append(_("Shapes: %d") % self.NumShapes())
484    
485            bbox = self.LatLongBoundingBox()
486            if bbox is not None:
487                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
488            else:
489                items.append(_("Extent (lat-lon):"))
490    
491            if self.projection and len(self.projection.params) > 0:
492                items.append((_("Projection"),
493                            [str(param) for param in self.projection.params]))
494    
495            return (_("Layer '%s'") % self.Title(), items)
496    
     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.82  
changed lines
  Added in v.1117
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