/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/layer.py
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revision 2562 by jonathan, Wed Feb 16 21:14:47 2005 UTC revision 2614 by jonathan, Fri May 6 14:16:38 2005 UTC
# Line 348  class RasterLayer(BaseLayer): Line 348  class RasterLayer(BaseLayer):
348      MASK_BIT   = 1      MASK_BIT   = 1
349      MASK_ALPHA = 2      MASK_ALPHA = 2
350    
351      def __init__(self, title, filename, projection = None, visible = True):      def __init__(self, title, filename, projection = None,
352                     visible = True, opacity = 1, masktype = MASK_BIT):
353          """Initialize the Raster Layer.          """Initialize the Raster Layer.
354    
355          title -- title for the layer.          title -- title for the layer.
# Line 371  class RasterLayer(BaseLayer): Line 372  class RasterLayer(BaseLayer):
372    
373          self.bbox = -1          self.bbox = -1
374    
375          self.mask_type = self.MASK_BIT          self.mask_type = masktype
376          self.alpha_opacity = 1          self.opacity = opacity
377    
378          self.image_info = None          self.image_info = None
379    
# Line 481  class RasterLayer(BaseLayer): Line 482  class RasterLayer(BaseLayer):
482              self.mask_type = type              self.mask_type = type
483              self.changed(LAYER_CHANGED, self)              self.changed(LAYER_CHANGED, self)
484    
485      def AlphaOpacity(self):      def Opacity(self):
486          """Return the level of opacity used in alpha blending, or None          """Return the level of opacity used in alpha blending.
         if mask type is not MASK_ALPHA.  
487          """          """
488          if self.mask_type == self.MASK_ALPHA:          return self.opacity
             return self.alpha_opacity  
         else:  
             return None  
489    
490      def SetAlphaOpacity(self, op):      def SetOpacity(self, op):
491          """Set the level of alpha opacity.          """Set the level of alpha opacity.
492    
493          0 <= op <= 1.          0 <= op <= 1.
# Line 500  class RasterLayer(BaseLayer): Line 497  class RasterLayer(BaseLayer):
497          if not (0 <= op <= 1):          if not (0 <= op <= 1):
498              raise ValueError("op out of range")              raise ValueError("op out of range")
499    
500          self.alpha_opacity = op          if op != self.opacity:
501                self.opacity = op
502                self.changed(LAYER_CHANGED, self)
503    
504      def ImageInfo(self):      def ImageInfo(self):
505          return self.image_info          return self.image_info
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