/[thuban]/trunk/thuban/Thuban/Model/layer.py
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revision 928 by bh, Tue May 6 15:54:18 2003 UTC revision 929 by jonathan, Tue May 20 15:22:42 2003 UTC
# Line 14  from Thuban import _ Line 14  from Thuban import _
14    
15  import shapelib, shptree  import shapelib, shptree
16    
17    import gdal
18    from gdalconst import GA_ReadOnly
19    
20  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \  from messages import LAYER_PROJECTION_CHANGED, LAYER_VISIBILITY_CHANGED, \
21       LAYER_CHANGED       LAYER_CHANGED
22    
# Line 74  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 = True):      def __init__(self, title, visible = True, projection = None):
81          """Initialize the layer.          """Initialize the layer.
82    
83          title -- the title          title -- the title
# Line 83  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 93  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 130  class Layer(BaseLayer): Line 146  class Layer(BaseLayer):
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          self.projection = projection                                   projection = projection)
152    
153          #          #
154          # this is really important so that when the classification class          # this is really important so that when the classification class
# Line 293  class Layer(BaseLayer): Line 309  class Layer(BaseLayer):
309    
310          return self.shapetree.find_shapes((left, bottom), (right, top))          return self.shapetree.find_shapes((left, bottom), (right, top))
311    
312      def GetProjection(self):      def HasClassification(self):
313          return self.projection          return True
   
     def SetProjection(self, projection):  
         """Set the layer's projection"""  
         self.projection = projection  
         self.changed(LAYER_PROJECTION_CHANGED, self)  
314    
315      def GetClassification(self):      def GetClassification(self):
316          return self.__classification          return self.__classification
# Line 360  class Layer(BaseLayer): Line 371  class Layer(BaseLayer):
371          return (_("Layer '%s'") % self.Title(), items)          return (_("Layer '%s'") % self.Title(), items)
372    
373    
374    class RasterLayer(BaseLayer):
375    
376        def __init__(self, title, filename, projection = None, visible = True):
377            """Initialize the Raster Layer.
378    
379            title -- title for the layer.
380    
381            filename -- file name of the source image.
382    
383            projection -- Projection object describing the projection which
384                          the source image is in.
385    
386            visible -- True is the layer should initially be visible.
387            """
388    
389            BaseLayer.__init__(self, title, visible = visible)
390    
391            self.projection = projection
392            self.filename = filename
393    
394            self.bbox = -1
395    
396            self.UnsetModified()
397    
398    
399        def BoundingBox(self):
400            """Return the layer's bounding box in the intrinsic coordinate system.
401    
402            If the layer has no shapes, return None.
403            """
404            if self.bbox == -1:
405                dataset = gdal.Open(self.filename, GA_ReadOnly)
406                if dataset is None:
407                    self.bbox = None
408                else:
409                    left, bottom = self.__CalcCorner(dataset,
410                                                     0, dataset.RasterYSize)
411                    right, top   = self.__CalcCorner(dataset,
412                                                     dataset.RasterXSize, 0)
413                    self.bbox = (left, bottom, right, top)
414    
415            return self.bbox
416    
417        def __CalcCorner(self, dataset, x, y):
418            geotransform = dataset.GetGeoTransform()
419            return geotransform[0] + geotransform[1] * x + geotransform[2] * y, \
420                   geotransform[3] + geotransform[4] * x + geotransform[5] * y
421    
422        def LatLongBoundingBox(self):
423            bbox = self.BoundingBox()
424            if bbox is not None:
425                llx, lly, urx, ury = bbox
426                if self.projection is not None:
427                    llx, lly = self.projection.Inverse(llx, lly)
428                    urx, ury = self.projection.Inverse(urx, ury)
429                return llx, lly, urx, ury
430            else:
431                return None
432    
433        def GetImageFilename(self):
434            return self.filename
435    
436        def TreeInfo(self):
437            items = []
438    
439            if self.Visible():
440                items.append(_("Shown"))
441            else:
442                items.append(_("Hidden"))
443            items.append(_("Shapes: %d") % self.NumShapes())
444    
445            bbox = self.LatLongBoundingBox()
446            if bbox is not None:
447                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
448            else:
449                items.append(_("Extent (lat-lon):"))
450    
451            if self.projection and len(self.projection.params) > 0:
452                items.append((_("Projection"),
453                            [str(param) for param in self.projection.params]))
454    
455            return (_("Layer '%s'") % self.Title(), items)
456    
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