/[thuban]/trunk/thuban/Thuban/Model/layer.py

Diff of /trunk/thuban/Thuban/Model/layer.py

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-revision 2339 by silke,
Fri Aug 20 16:59:21 2004 UTC
+revision 2614 by jonathan,
Fri May  6 14:16:38 2005 UTC
 Line 25 
 from data import SHAPETYPE_POLYGON, SHAP
  import resource
+ from color import Color
  shapetype_names = {SHAPETYPE_POINT: "Point",
                     SHAPETYPE_ARC: "Arc",
-Line 55 
 class BaseLayer(TitledObject, Modifiable
+Line 56 
 class BaseLayer(TitledObject, Modifiable
          self.issue(LAYER_VISIBILITY_CHANGED, self)
      def HasClassification(self):
-         """Determine if this layer support classifications."""
+         """Determine if this layer supports classifications."""
          return False
      def HasShapes(self):
-Line 67 
 class BaseLayer(TitledObject, Modifiable
+Line 68 
 class BaseLayer(TitledObject, Modifiable
          return self.projection
      def SetProjection(self, projection):
-         """Set the layer's projection"""
+         """Set the layer's projection."""
          self.projection = projection
          self.changed(LAYER_PROJECTION_CHANGED, self)
+     def Type(self):
+         return "Unknown"
  class Layer(BaseLayer):
      """Represent the information of one geodata file (currently a shapefile)
-Line 171 
 class Layer(BaseLayer):
+Line 175 
 class Layer(BaseLayer):
              bbox = self.projection.InverseBBox(bbox)
          return bbox
+     def Type(self):
+         return self.ShapeType();
      def ShapesBoundingBox(self, shapes):
          """Return a bounding box in lat/long coordinates for the given
          list of shape ids.
-Line 337 
 if resource.has_gdal_support():
+Line 344 
 if resource.has_gdal_support():
  class RasterLayer(BaseLayer):
-     def __init__(self, title, filename, projection = None, visible = True):
+     MASK_NONE  = 0
+     MASK_BIT   = 1
+     MASK_ALPHA = 2
+     def __init__(self, title, filename, projection = None,
+                  visible = True, opacity = 1, masktype = MASK_BIT):
          """Initialize the Raster Layer.
          title -- title for the layer.
-Line 360 
 class RasterLayer(BaseLayer):
+Line 372 
 class RasterLayer(BaseLayer):
          self.bbox = -1
+         self.mask_type = masktype
+         self.opacity = opacity
+         self.image_info = None
          if resource.has_gdal_support():
              #
              # temporarily open the file so that GDAL can test if it's valid.
-Line 369 
 class RasterLayer(BaseLayer):
+Line 386 
 class RasterLayer(BaseLayer):
              if dataset is None:
                  raise IOError()
+             #
+             # while we have the file, extract some basic information
+             # that we can display later
+             #
+             self.image_info = {}
+             self.image_info["nBands"] = dataset.RasterCount
+             self.image_info["Size"] = (dataset.RasterXSize, dataset.RasterYSize)
+             self.image_info["Driver"] = dataset.GetDriver().ShortName
+             # store some information about the individual bands
+             # [min_value, max_value]
+             a = self.image_info["BandData"] = []
+             for i in range(1, dataset.RasterCount+1):
+                 band = dataset.GetRasterBand(i)
+                 a.append(band.ComputeRasterMinMax())
          self.UnsetModified()
      def BoundingBox(self):
-Line 423 
 class RasterLayer(BaseLayer):
+Line 458 
 class RasterLayer(BaseLayer):
          return bbox
+     def Type(self):
+         return "Image"
      def GetImageFilename(self):
          return self.filename
+     def MaskType(self):
+         """Return True if the mask should be used when rendering the layer."""
+         return self.mask_type
+     def SetMaskType(self, type):
+         """Set the type of mask to use.
+         type can be one of MASK_NONE, MASK_BIT, MASK_ALPHA
+         If the state changes, a LAYER_CHANGED message is sent.
+         """
+         if type not in (self.MASK_NONE, self.MASK_BIT, self.MASK_ALPHA):
+             raise ValueError("type is invalid")
+         if type != self.mask_type:
+             self.mask_type = type
+             self.changed(LAYER_CHANGED, self)
+     def Opacity(self):
+         """Return the level of opacity used in alpha blending.
+         """
+         return self.opacity
+     def SetOpacity(self, op):
+         """Set the level of alpha opacity.
+<= op <= 1.
+         The layer is fully opaque when op = 1.
+         """
+         if not (0 <= op <= 1):
+             raise ValueError("op out of range")
+         if op != self.opacity:
+             self.opacity = op
+             self.changed(LAYER_CHANGED, self)
+     def ImageInfo(self):
+         return self.image_info
      def TreeInfo(self):
          items = []

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