/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 217 by bh, Wed Jul 17 10:50:40 2002 UTC revision 1142 by bh, Tue Jun 10 09:41:57 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.
# Line 9  __version__ = "$Revision$" Line 10  __version__ = "$Revision$"
10    
11  from math import log, ceil  from math import log, ceil
12    
13    from Thuban import _
14    
15  import shapelib, shptree  import shapelib, shptree
16    
17  from messages import LAYER_PROJECTION_CHANGED, LAYER_LEGEND_CHANGED, \  import gdal
18       LAYER_VISIBILITY_CHANGED  from gdalconst import GA_ReadOnly
19    
20  from color import Color  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
21  # Some predefined colors for internal use       LAYER_CHANGED, LAYER_SHAPESTORE_REPLACED
 _black = Color(0, 0, 0)  
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 30  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 42  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 65  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 74  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 83  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 99  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.shapetree = None          #
157          self.open_shapefile()          self.__classification = None
158          # shapetable is the table associated with the shapefile, while          self.__setClassLock = False
159          # table is the default table used to look up attributes for  
160          # display          self.SetShapeStore(data)
161          self.shapetable = Table(filename)  
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              # if there are shapes, set the bbox accordinly. Otherwise              self.bbox = mins[:2] + maxs[:2]
188              # set it to None.          else:
189              if self.numshapes:              self.bbox = None
                 self.bbox = mins[:2] + maxs[:2]  
             else:  
                 self.bbox = None  
190    
191              # estimate a good depth for the quad tree. Each depth          # estimate a good depth for the quad tree. Each depth
192              # multiplies the number of nodes by four, therefore we          # multiplies the number of nodes by four, therefore we
193              # basically take the base 4 logarithm of the number of          # basically take the base 4 logarithm of the number of
194              # shapes.          # shapes.
195              if self.numshapes < 4:          if self.numshapes < 4:
196                  maxdepth = 1              maxdepth = 1
197              else:          else:
198                  maxdepth = int(ceil(log(self.numshapes / 4.0) / log(4)))              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_SHAPESTORE_REPLACED, 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 layer's bounding box in the intrinsic coordinate system.          """Return the layer's bounding box in the intrinsic coordinate system.
228    
229          If the layer has no shapes, return None.          If the layer has no shapes, return None.
230          """          """
         # The bbox will be set by open_shapefile just as we need it  
         # here.  
         self.open_shapefile()  
231          return self.bbox          return self.bbox
232    
233      def LatLongBoundingBox(self):      def LatLongBoundingBox(self):
# Line 184  class Layer(BaseLayer): Line 245  class Layer(BaseLayer):
245          else:          else:
246              return None              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:
263                inverse = lambda x, y: self.projection.Inverse(x, y)
264            else:
265                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 208  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 ShapesInRegion(self, box):      def ShapesInRegion(self, box):
311          """Return the ids of the shapes that overlap the box.          """Return the ids of the shapes that overlap the box.
312    
313          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.  
314          """          """
315          left, bottom, right, top = box          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))          return self.shapetree.find_shapes((left, bottom), (right, top))
322    
323      def SetProjection(self, projection):      def HasClassification(self):
324          """Set the layer's projection"""          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      def SetFill(self, fill):          #
414          """Set the layer's fill color. None means the shapes are not filled"""          # temporarily open the file so that GDAL can test if it's valid.
415          self.fill = fill          #
416          self.changed(LAYER_LEGEND_CHANGED, self)          dataset = gdal.Open(self.filename, GA_ReadOnly)
417    
418      def SetStroke(self, stroke):          if dataset is None:
419          """Set the layer's stroke color. None means the shapes are not              raise IOError()
420          stroked."""  
421          self.stroke = stroke          self.UnsetModified()
422          self.changed(LAYER_LEGEND_CHANGED, self)  
423        def BoundingBox(self):
424      def SetStrokeWidth(self, width):          """Return the layer's bounding box in the intrinsic coordinate system.
425          """Set the layer's stroke width."""  
426          self.stroke_width = width          If the layer has no shapes, return None.
427          self.changed(LAYER_LEGEND_CHANGED, self)          """
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):      def TreeInfo(self):
477          items = []          items = []
478    
479          if self.Visible():          if self.Visible():
480              items.append("Shown")              items.append(_("Shown"))
481          else:          else:
482              items.append("Hidden")              items.append(_("Hidden"))
483          items.append("Shapes: %d" % self.NumShapes())          items.append(_("Shapes: %d") % self.NumShapes())
484    
485          bbox = self.LatLongBoundingBox()          bbox = self.LatLongBoundingBox()
486          if bbox is not None:          if bbox is not None:
487              items.append("Extent (lat-lon): (%g, %g, %g, %g)" % bbox)              items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
488          else:          else:
489              items.append("Extent (lat-lon):")              items.append(_("Extent (lat-lon):"))
490          items.append("Shapetype: %s" % shapetype_names[self.ShapeType()])  
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          def color_string(color):          return (_("Layer '%s'") % self.Title(), items)
             if color is None:  
                 return "None"  
             return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue)  
         items.append("Fill: " + color_string(self.fill))  
         items.append("Outline: " + color_string(self.stroke))  
496    
         return ("Layer '%s'" % self.Title(), items)  
Legend:
Removed from v.217  
changed lines
  Added in v.1142
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