/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 545 by jonathan, Thu Mar 20 09:44:04 2003 UTC revision 1088 by bh, Wed May 28 12:42:23 2003 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]>
# Line 8  Line 8 
8    
9  __version__ = "$Revision$"  __version__ = "$Revision$"
10    
 import os  
11  from math import log, ceil  from math import log, ceil
12    
13  from Thuban import _  from Thuban import _
14    
15  import shapelib, shptree  import shapelib, shptree
16    
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  import gdal
18       LAYER_VISIBILITY_CHANGED, LAYER_CHANGED  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  from color import Color
24    
25  import classification  import classification
26    
 from table import Table  
   
27  from base import TitledObject, Modifiable  from base import TitledObject, Modifiable
28    
29    
30  class Shape:  class Shape:
31    
32      """Represent one shape"""      """Represent one shape"""
# Line 33  class Shape: Line 34  class Shape:
34      def __init__(self, points):      def __init__(self, points):
35          self.points = points          self.points = points
36          #self.compute_bbox()          #self.compute_bbox()
37            self.bbox = None
38    
39      def compute_bbox(self):      def compute_bbox(self):
40            if self.bbox is not None:
41                return self.bbox
42    
43          xs = []          xs = []
44          ys = []          ys = []
45          for x, y in self.points:          for x, y in self.points:
# Line 45  class Shape: Line 50  class Shape:
50          self.urx = max(xs)          self.urx = max(xs)
51          self.ury = max(ys)          self.ury = max(ys)
52    
53            self.bbox = (self.llx, self.lly, self.urx, self.ury)
54    
55            return self.bbox
56    
57      def Points(self):      def Points(self):
58          return self.points          return self.points
59    
# Line 68  class BaseLayer(TitledObject, Modifiable Line 77  class BaseLayer(TitledObject, Modifiable
77    
78      """Base class for the layers."""      """Base class for the layers."""
79    
80      def __init__(self, title, visible = 1):      def __init__(self, title, visible = True, projection = None):
81          """Initialize the layer.          """Initialize the layer.
82    
83          title -- the title          title -- the title
# Line 77  class BaseLayer(TitledObject, Modifiable Line 86  class BaseLayer(TitledObject, Modifiable
86          TitledObject.__init__(self, title)          TitledObject.__init__(self, title)
87          Modifiable.__init__(self)          Modifiable.__init__(self)
88          self.visible = visible          self.visible = visible
89            self.projection = projection
90    
91      def Visible(self):      def Visible(self):
92          """Return true if layer is visible"""          """Return true if layer is visible"""
# Line 87  class BaseLayer(TitledObject, Modifiable Line 97  class BaseLayer(TitledObject, Modifiable
97          self.visible = visible          self.visible = visible
98          self.issue(LAYER_VISIBILITY_CHANGED, self)          self.issue(LAYER_VISIBILITY_CHANGED, self)
99    
100        def HasClassification(self):
101            """Determine if this layer support classifications."""
102            return False
103    
104        def GetProjection(self):
105            """Return the layer's projection."""
106            return self.projection
107    
108        def SetProjection(self, projection):
109            """Set the layer's projection"""
110            self.projection = projection
111            self.changed(LAYER_PROJECTION_CHANGED, self)
112    
113  class Layer(BaseLayer):  class Layer(BaseLayer):
114    
# Line 102  class Layer(BaseLayer): Line 124  class Layer(BaseLayer):
124    
125          TITLE_CHANGED -- The title has changed.          TITLE_CHANGED -- The title has changed.
126          LAYER_PROJECTION_CHANGED -- the projection has changed.          LAYER_PROJECTION_CHANGED -- the projection has changed.
         LAYER_LEGEND_CHANGED -- the fill or stroke attributes have changed  
   
127      """      """
128    
129      def __init__(self, title, filename, projection = None,      def __init__(self, title, data, projection = None,
130                   fill = Color.None,                   fill = Color.Transparent,
131                   stroke = Color.Black,                   stroke = Color.Black,
132                   lineWidth = 1,                   lineWidth = 1,
133                   visible = 1):                   visible = True):
134          """Initialize the layer.          """Initialize the layer.
135    
136          title -- the title          title -- the title
137          filename -- the name of the shapefile          data -- datastore object for the shape data shown by the layer
138          projection -- the projection object. Its Inverse method is          projection -- the projection object. Its Inverse method is
139                 assumed to map the layer's coordinates to lat/long                 assumed to map the layer's coordinates to lat/long
140                 coordinates                 coordinates
141          fill -- the fill color or Color.None if the shapes are not filled          fill -- the fill color or Color.Transparent if the shapes are
142          stroke -- the stroke color or Color.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)
         # interpreted relative to that anyway, but when saving a  
         # session we need to compare absolute paths and it's usually  
         # safer to always work with absolute paths.  
         self.filename = os.path.abspath(filename)  
   
         self.projection = projection  
         self.shapefile = None  
         self.shapetree = None  
         self.open_shapefile()  
         # shapetable is the table associated with the shapefile, while  
         # table is the default table used to look up attributes for  
         # display  
         self.shapetable = Table(filename)  
         self.table = self.shapetable  
152    
153          #          #
154          # this is really important so that when the classification class          # this is really important so that when the classification class
155          # tries to set its parent layer the variable will exist          # tries to set its parent layer the variable will exist
156          #          #
157          self.__classification = None          self.__classification = None
158          self.__setClassLock = False          self.__setClassLock = False
159    
160            self.SetShapeStore(data)
161    
162          self.SetClassification(None)          self.SetClassification(None)
163    
# Line 159  class Layer(BaseLayer): Line 168  class Layer(BaseLayer):
168    
169          self.UnsetModified()          self.UnsetModified()
170    
     def open_shapefile(self):  
         if self.shapefile is None:  
             self.shapefile = shapelib.ShapeFile(self.filename)  
             numshapes, shapetype, mins, maxs = self.shapefile.info()  
             self.numshapes = numshapes  
             self.shapetype = shapelib_shapetypes[shapetype]  
   
             # if there are shapes, set the bbox accordinly. Otherwise  
             # set it to None.  
             if self.numshapes:  
                 self.bbox = mins[:2] + maxs[:2]  
             else:  
                 self.bbox = None  
171    
172              # estimate a good depth for the quad tree. Each depth      def SetShapeStore(self, store):
173              # multiplies the number of nodes by four, therefore we          self.store = store
174              # basically take the base 4 logarithm of the number of          self.shapefile = self.store.Shapefile()
175              # shapes.          self.shapetable = self.store.Table()
176              if self.numshapes < 4:          if hasattr(self.store, "FileName"):
177                  maxdepth = 1              self.filename = self.store.FileName()
178              else:          self.table = self.shapetable
179                  maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))  
180            numshapes, shapetype, mins, maxs = self.shapefile.info()
181            self.numshapes = numshapes
182            self.shapetype = shapelib_shapetypes[shapetype]
183    
184            # if there are shapes, set the bbox accordingly. Otherwise
185            # set it to None.
186            if self.numshapes:
187                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,          self.shapetree = shptree.SHPTree(self.shapefile.cobject(), 2,
201                                               maxdepth)                                           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):      def Destroy(self):
221          BaseLayer.Destroy(self)          BaseLayer.Destroy(self)
         if self.shapefile is not None:  
             self.shapefile.close()  
             self.shapefile = None  
             self.shapetree = None  
222          self.SetClassification(None)          self.SetClassification(None)
         self.table.Destroy()  
223    
224      def BoundingBox(self):      def BoundingBox(self):
225          """Return the layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
226    
227          If the layer has no shapes, return None.          If the layer has no shapes, return None.
228          """          """
         # The bbox will be set by open_shapefile just as we need it  
         # here.  
         self.open_shapefile()  
229          return self.bbox          return self.bbox
230    
231      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
# Line 219  class Layer(BaseLayer): Line 243  class Layer(BaseLayer):
243          else:          else:
244              return None              return None
245    
246      def GetFieldType(self, fieldName):      def ShapesBoundingBox(self, shapes):
247          self.open_shapefile()          """Return a bounding box in lat/long coordinates for the given
248          info = self.table.field_info_by_name(fieldName)          list of shape ids.
249          if info is not None:  
250              return info[0]          If shapes is None or empty, return None.
251            """
252    
253            if shapes is None or len(shapes) == 0: return None
254    
255            llx = []
256            lly = []
257            urx = []
258            ury = []
259    
260            if self.projection is not None:
261                inverse = lambda x, y: self.projection.Inverse(x, y)
262          else:          else:
263              return None              inverse = lambda x, y: (x, y)
264    
265            for id in shapes:
266                left, bottom, right, top = self.Shape(id).compute_bbox()
267    
268                left, bottom = inverse(left, bottom)
269                right, top   = inverse(right, top)
270    
271                llx.append(left)
272                lly.append(bottom)
273                urx.append(right)
274                ury.append(top)
275    
276            return (min(llx), min(lly), max(urx), max(ury))
277    
278        def GetFieldType(self, fieldName):
279            if self.table.HasColumn(fieldName):
280                return self.table.Column(fieldName).type
281            return None
282    
283      def NumShapes(self):      def NumShapes(self):
284          """Return the number of shapes in the layer"""          """Return the number of shapes in the layer"""
         self.open_shapefile()  
285          return self.numshapes          return self.numshapes
286    
287      def ShapeType(self):      def ShapeType(self):
288          """Return the type of the shapes in the layer.          """Return the type of the shapes in the layer.
289          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.          This is either SHAPETYPE_POINT, SHAPETYPE_ARC or SHAPETYPE_POLYGON.
290          """          """
         self.open_shapefile()  
291          return self.shapetype          return self.shapetype
292    
293      def Shape(self, index):      def Shape(self, index):
294          """Return the shape with index index"""          """Return the shape with index index"""
         self.open_shapefile()  
295          shape = self.shapefile.read_object(index)          shape = self.shapefile.read_object(index)
296    
297          if self.shapetype == SHAPETYPE_POINT:          if self.shapetype == SHAPETYPE_POINT:
# Line 258  class Layer(BaseLayer): Line 308  class Layer(BaseLayer):
308      def ShapesInRegion(self, box):      def ShapesInRegion(self, box):
309          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
310    
311          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.  
312          """          """
313          left, bottom, right, top = box          left, bottom, right, top = box
314    
315            if self.projection is not None:
316                left,  bottom = self.projection.Forward(left, bottom)
317                right, top    = self.projection.Forward(right, top)
318    
319          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
320    
321      def SetProjection(self, projection):      def HasClassification(self):
322          """Set the layer's projection"""          return True
         self.projection = projection  
         self.changed(LAYER_PROJECTION_CHANGED, self)  
323    
324      def GetClassification(self):      def GetClassification(self):
325          return self.__classification          return self.__classification
# Line 301  class Layer(BaseLayer): Line 353  class Layer(BaseLayer):
353    
354      def ClassChanged(self):      def ClassChanged(self):
355          """Called from the classification object when it has changed."""          """Called from the classification object when it has changed."""
356          self.changed(LAYER_LEGEND_CHANGED, self)          self.changed(LAYER_CHANGED, self)
357    
358      def TreeInfo(self):      def TreeInfo(self):
359          items = []          items = []
360    
361            if hasattr(self, 'filename'):
362                items.append(_("Filename: %s") % self.filename)
363    
364          if self.Visible():          if self.Visible():
365              items.append(_("Shown"))              items.append(_("Shown"))
366          else:          else:
# Line 319  class Layer(BaseLayer): Line 374  class Layer(BaseLayer):
374              items.append(_("Extent (lat-lon):"))              items.append(_("Extent (lat-lon):"))
375          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])          items.append(_("Shapetype: %s") % shapetype_names[self.ShapeType()])
376    
377            if self.projection and len(self.projection.params) > 0:
378                items.append((_("Projection"),
379                            [str(param) for param in self.projection.params]))
380    
381          items.append(self.__classification)          items.append(self.__classification)
382    
383          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
384    
385    
386    class RasterLayer(BaseLayer):
387    
388        def __init__(self, title, filename, projection = None, visible = True):
389            """Initialize the Raster Layer.
390    
391            title -- title for the layer.
392    
393            filename -- file name of the source image.
394    
395            projection -- Projection object describing the projection which
396                          the source image is in.
397    
398            visible -- True is the layer should initially be visible.
399    
400            Throws IOError if the filename is invalid or points to a file that
401            is not in a format GDAL can use.
402            """
403    
404            BaseLayer.__init__(self, title, visible = visible)
405    
406            self.projection = projection
407            self.filename = filename
408    
409            self.bbox = -1
410    
411            #
412            # temporarily open the file so that GDAL can test if it's valid.
413            #
414            dataset = gdal.Open(self.filename, GA_ReadOnly)
415    
416            if dataset is None:
417                raise IOError()
418    
419            self.UnsetModified()
420    
421        def BoundingBox(self):
422            """Return the layer's bounding box in the intrinsic coordinate system.
423    
424            If the layer has no shapes, return None.
425            """
426            if self.bbox == -1:
427                dataset = gdal.Open(self.filename, GA_ReadOnly)
428                if dataset is None:
429                    self.bbox = None
430                else:
431                    geotransform = dataset.GetGeoTransform()
432                    if geotransform is None:
433                        return None
434    
435                    x = 0
436                    y = dataset.RasterYSize
437                    left = geotransform[0] +        \
438                           geotransform[1] * x +    \
439                           geotransform[2] * y
440    
441                    bottom = geotransform[3] +      \
442                             geotransform[4] * x +  \
443                             geotransform[5] * y
444    
445                    x = dataset.RasterXSize
446                    y = 0
447                    right = geotransform[0] +       \
448                            geotransform[1] * x +   \
449                            geotransform[2] * y
450    
451                    top = geotransform[3] +         \
452                          geotransform[4] * x +     \
453                          geotransform[5] * y
454    
455                    self.bbox = (left, bottom, right, top)
456    
457            return self.bbox
458    
459        def LatLongBoundingBox(self):
460            bbox = self.BoundingBox()
461            if bbox is None:
462                return None
463    
464            llx, lly, urx, ury = bbox
465            if self.projection is not None:
466                llx, lly = self.projection.Inverse(llx, lly)
467                urx, ury = self.projection.Inverse(urx, ury)
468    
469            return llx, lly, urx, ury
470    
471        def GetImageFilename(self):
472            return self.filename
473    
474        def TreeInfo(self):
475            items = []
476    
477            if self.Visible():
478                items.append(_("Shown"))
479            else:
480                items.append(_("Hidden"))
481            items.append(_("Shapes: %d") % self.NumShapes())
482    
483            bbox = self.LatLongBoundingBox()
484            if bbox is not None:
485                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
486            else:
487                items.append(_("Extent (lat-lon):"))
488    
489            if self.projection and len(self.projection.params) > 0:
490                items.append((_("Projection"),
491                            [str(param) for param in self.projection.params]))
492    
493            return (_("Layer '%s'") % self.Title(), items)
494    
Legend:
Removed from v.545  
changed lines
  Added in v.1088
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