/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/layer.py

Diff of /branches/WIP-pyshapelib-bramz/Thuban/Model/layer.py

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-revision 2343 by bernhard,
Mon Sep 20 08:13:32 2004 UTC
+revision 2562 by jonathan,
Wed Feb 16 21:14:47 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 71 
 class BaseLayer(TitledObject, Modifiable
+Line 72 
 class BaseLayer(TitledObject, Modifiable
          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):
+     MASK_NONE  = 0
+     MASK_BIT   = 1
+     MASK_ALPHA = 2
      def __init__(self, title, filename, projection = None, visible = True):
          """Initialize the Raster Layer.
-Line 360 
 class RasterLayer(BaseLayer):
+Line 371 
 class RasterLayer(BaseLayer):
          self.bbox = -1
+         self.mask_type = self.MASK_BIT
+         self.alpha_opacity = 1
+         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 385 
 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 457 
 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 AlphaOpacity(self):
+         """Return the level of opacity used in alpha blending, or None
+         if mask type is not MASK_ALPHA.
+         """
+         if self.mask_type == self.MASK_ALPHA:
+             return self.alpha_opacity
+         else:
+             return None
+     def SetAlphaOpacity(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")
+         self.alpha_opacity = op
+     def ImageInfo(self):
+         return self.image_info
      def TreeInfo(self):
          items = []

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