/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/layer.py
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revision 839 by bh, Tue May 6 15:54:18 2003 UTC revision 961 by jonathan, Wed May 21 17:23:25 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            Throws IOError if the filename is invalid or points to a file that
389            is not in a format GDAL can use.
390            """
391    
392            BaseLayer.__init__(self, title, visible = visible)
393    
394            self.projection = projection
395            self.filename = filename
396    
397            self.bbox = -1
398    
399            #
400            # temporarily open the file so that GDAL can test if it's valid.
401            #
402            dataset = gdal.Open(self.filename, GA_ReadOnly)
403    
404            if dataset is None:
405                raise IOError()
406    
407            self.UnsetModified()
408    
409        def BoundingBox(self):
410            """Return the layer's bounding box in the intrinsic coordinate system.
411    
412            If the layer has no shapes, return None.
413            """
414            if self.bbox == -1:
415                dataset = gdal.Open(self.filename, GA_ReadOnly)
416                if dataset is None:
417                    self.bbox = None
418                else:
419                    geotransform = dataset.GetGeoTransform()
420                    if geotransform is None:
421                        return None
422    
423                    x = 0
424                    y = dataset.RasterYSize
425                    left = geotransform[0] +        \
426                           geotransform[1] * x +    \
427                           geotransform[2] * y
428    
429                    bottom = geotransform[3] +      \
430                             geotransform[4] * x +  \
431                             geotransform[5] * y
432    
433                    x = dataset.RasterXSize
434                    y = 0
435                    right = geotransform[0] +       \
436                            geotransform[1] * x +   \
437                            geotransform[2] * y
438    
439                    top = geotransform[3] +         \
440                          geotransform[4] * x +     \
441                          geotransform[5] * y
442    
443                    self.bbox = (left, bottom, right, top)
444    
445            return self.bbox
446    
447        def LatLongBoundingBox(self):
448            bbox = self.BoundingBox()
449            if bbox is None:
450                return None
451    
452            llx, lly, urx, ury = bbox
453            if self.projection is not None:
454                llx, lly = self.projection.Inverse(llx, lly)
455                urx, ury = self.projection.Inverse(urx, ury)
456    
457            return llx, lly, urx, ury
458    
459        def GetImageFilename(self):
460            return self.filename
461    
462        def TreeInfo(self):
463            items = []
464    
465            if self.Visible():
466                items.append(_("Shown"))
467            else:
468                items.append(_("Hidden"))
469            items.append(_("Shapes: %d") % self.NumShapes())
470    
471            bbox = self.LatLongBoundingBox()
472            if bbox is not None:
473                items.append(_("Extent (lat-lon): (%g, %g, %g, %g)") % bbox)
474            else:
475                items.append(_("Extent (lat-lon):"))
476    
477            if self.projection and len(self.projection.params) > 0:
478                items.append((_("Projection"),
479                            [str(param) for param in self.projection.params]))
480    
481            return (_("Layer '%s'") % self.Title(), items)
482    
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