/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2011, Open Source Geospatial Foundation (OSGeo)
* (C) 2008, Open Geospatial Consortium Inc.
*
* All Rights Reserved. http://www.opengis.org/legal/
*/
package org.opengis.style;
import org.opengis.annotation.Extension;
import org.opengis.annotation.XmlElement;
import org.opengis.filter.expression.Function;
/**
* <p>The ColorMap element defines the mapping of palette-type raster colors or fixed-
* numeric pixel values to colors using an Interpolate or Categorize SE function
* </p>
* <p>
* For example, a DEM raster giving elevations in meters above sea level can be
* translated to a colored image with a ColorMap. The quantity attributes of
* a color-map are used for translating between numeric matrixes and color
* rasters and the ColorMap entries should be in order of increasing numeric
* quantity so that intermediate numeric values can be matched to a color (or
* be interpolated between two colors). Labels may be used for legends or
* may be used in the future to match character values. Not all systems can
* support opacity in colormaps. The default opacity is 1.0 (fully opaque).
* Defaults for quantity and label are system-dependent.
* </p>
*
* @source $URL: http://svn.osgeo.org/geotools/trunk/modules/library/opengis/src/main/java/org/opengis/style/ColorMap.java $
* @version <A HREF="http://www.opengeospatial.org/standards/symbol">Symbology Encoding Implementation Specification 1.1.0</A>
* @author Open Geospatial Consortium
* @author Johann Sorel (Geomatys)
* @since GeoAPI 2.2
*/
@XmlElement("ColorMap")
public interface ColorMap {
/**
*
* @return Interpolate or Categorize function
*/
Function getFunction();
/**
* calls the visit method of a StyleVisitor
*
* @param visitor the style visitor
*/
@Extension
Object accept(StyleVisitor visitor, Object extraData);
}