/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/layer.py
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revision 2552 by jonathan, Fri Jan 28 15:54:00 2005 UTC revision 2562 by jonathan, Wed Feb 16 21:14:47 2005 UTC
# Line 344  if resource.has_gdal_support(): Line 344  if resource.has_gdal_support():
344    
345  class RasterLayer(BaseLayer):  class RasterLayer(BaseLayer):
346    
347        MASK_NONE  = 0
348        MASK_BIT   = 1
349        MASK_ALPHA = 2
350    
351      def __init__(self, title, filename, projection = None, visible = True):      def __init__(self, title, filename, projection = None, visible = True):
352          """Initialize the Raster Layer.          """Initialize the Raster Layer.
353    
# Line 367  class RasterLayer(BaseLayer): Line 371  class RasterLayer(BaseLayer):
371    
372          self.bbox = -1          self.bbox = -1
373    
374          self.use_mask = True          self.mask_type = self.MASK_BIT
375            self.alpha_opacity = 1
376    
377          self.image_info = None          self.image_info = None
378    
# Line 458  class RasterLayer(BaseLayer): Line 463  class RasterLayer(BaseLayer):
463      def GetImageFilename(self):      def GetImageFilename(self):
464          return self.filename          return self.filename
465    
466      def UseMask(self):      def MaskType(self):
467          """Return True if the mask should be used when rendering the layer."""          """Return True if the mask should be used when rendering the layer."""
468          return self.use_mask          return self.mask_type
469    
470        def SetMaskType(self, type):
471            """Set the type of mask to use.
472    
473      def SetUseMask(self, use):          type can be one of MASK_NONE, MASK_BIT, MASK_ALPHA
         """Set whether to use a mask when render the image.  
474    
475          If the state changes, a LAYER_CHANGED message is sent.          If the state changes, a LAYER_CHANGED message is sent.
476          """          """
477          if use != self.use_mask:          if type not in (self.MASK_NONE, self.MASK_BIT, self.MASK_ALPHA):
478              self.use_mask = use              raise ValueError("type is invalid")
479    
480            if type != self.mask_type:
481                self.mask_type = type
482              self.changed(LAYER_CHANGED, self)              self.changed(LAYER_CHANGED, self)
483    
484        def AlphaOpacity(self):
485            """Return the level of opacity used in alpha blending, or None
486            if mask type is not MASK_ALPHA.
487            """
488            if self.mask_type == self.MASK_ALPHA:
489                return self.alpha_opacity
490            else:
491                return None
492    
493        def SetAlphaOpacity(self, op):
494            """Set the level of alpha opacity.
495    
496            0 <= op <= 1.
497    
498            The layer is fully opaque when op = 1.
499            """
500            if not (0 <= op <= 1):
501                raise ValueError("op out of range")
502    
503            self.alpha_opacity = op
504    
505      def ImageInfo(self):      def ImageInfo(self):
506          return self.image_info          return self.image_info
507    
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