/[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 2614 by jonathan, Fri May 6 14:16:38 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      def __init__(self, title, filename, projection = None, visible = True):      MASK_NONE  = 0
348        MASK_BIT   = 1
349        MASK_ALPHA = 2
350    
351        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 367  class RasterLayer(BaseLayer): Line 372  class RasterLayer(BaseLayer):
372    
373          self.bbox = -1          self.bbox = -1
374    
375          self.use_mask = True          self.mask_type = masktype
376            self.opacity = opacity
377    
378          self.image_info = None          self.image_info = None
379    
# Line 458  class RasterLayer(BaseLayer): Line 464  class RasterLayer(BaseLayer):
464      def GetImageFilename(self):      def GetImageFilename(self):
465          return self.filename          return self.filename
466    
467      def UseMask(self):      def MaskType(self):
468          """Return True if the mask should be used when rendering the layer."""          """Return True if the mask should be used when rendering the layer."""
469          return self.use_mask          return self.mask_type
470    
471        def SetMaskType(self, type):
472            """Set the type of mask to use.
473    
474      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.  
475    
476          If the state changes, a LAYER_CHANGED message is sent.          If the state changes, a LAYER_CHANGED message is sent.
477          """          """
478          if use != self.use_mask:          if type not in (self.MASK_NONE, self.MASK_BIT, self.MASK_ALPHA):
479              self.use_mask = use              raise ValueError("type is invalid")
480    
481            if type != self.mask_type:
482                self.mask_type = type
483                self.changed(LAYER_CHANGED, self)
484    
485        def Opacity(self):
486            """Return the level of opacity used in alpha blending.
487            """
488            return self.opacity
489    
490        def SetOpacity(self, op):
491            """Set the level of alpha opacity.
492    
493            0 <= op <= 1.
494    
495            The layer is fully opaque when op = 1.
496            """
497            if not (0 <= op <= 1):
498                raise ValueError("op out of range")
499    
500            if op != self.opacity:
501                self.opacity = op
502              self.changed(LAYER_CHANGED, self)              self.changed(LAYER_CHANGED, self)
503    
504      def ImageInfo(self):      def ImageInfo(self):
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