/**
* Java Modular Image Synthesis Toolkit (JMIST)
* Copyright (C) 2008-2013 Bradley W. Kimmel
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
package ca.eandb.jmist.framework.texture;
import java.util.ArrayList;
import java.util.List;
import ca.eandb.jmist.framework.Mask2;
import ca.eandb.jmist.framework.Texture2;
import ca.eandb.jmist.framework.color.CIEXYZ;
import ca.eandb.jmist.framework.color.CIExyY;
import ca.eandb.jmist.framework.color.Color;
import ca.eandb.jmist.framework.color.ColorModel;
import ca.eandb.jmist.framework.color.ColorUtil;
import ca.eandb.jmist.framework.color.WavelengthPacket;
import ca.eandb.jmist.math.Point2;
/**
* A <code>Texture2</code> that renders the CIE xy chromaticity diagram.
* This class is a singleton.
* @author Brad Kimmel
*/
public final class CIExyChromaticityTexture2 implements Texture2 {
/** Serialization version ID. */
private static final long serialVersionUID = -2115762100667409214L;
/** The single instance of this class. */
private static final CIExyChromaticityTexture2 INSTANCE = new CIExyChromaticityTexture2();
/** The <code>Mask2</code> denoting the shape of the diagram. */
private final Mask2 gamutMask;
/**
* Gets the single instance of this class.
* @return The single instance of <code>CIExyChromaticityTexture2</code>.
*/
public static CIExyChromaticityTexture2 getInstance() {
return INSTANCE;
}
/**
* Creates a new <code>CIExyChromaticityTexture2</code>. This constructor
* is private because this class is a singleton.
*/
private CIExyChromaticityTexture2() {
List<Point2> vertices = new ArrayList<Point2>();
for (int i = 0, n = ColorUtil.XYZ_WAVELENGTHS.size(); i < n; i++) {
double X = ColorUtil.X_BAR.at(i);
double Y = ColorUtil.Y_BAR.at(i);
double Z = ColorUtil.Z_BAR.at(i);
double x = X / (X + Y + Z);
double y = Y / (X + Y + Z);
vertices.add(new Point2(x, y));
}
gamutMask = new PolygonMask2(vertices, 100);
}
/* (non-Javadoc)
* @see ca.eandb.jmist.framework.Texture2#evaluate(ca.eandb.jmist.math.Point2, ca.eandb.jmist.framework.color.WavelengthPacket)
*/
@Override
public Color evaluate(Point2 p, WavelengthPacket lambda) {
ColorModel cm = lambda.getColorModel();
if (gamutMask.opacity(p) > 0.5) {
CIEXYZ xyz = new CIExyY(p.x(), p.y(), p.y()).toXYZ();
return cm.fromXYZ(xyz).sample(lambda);
} else {
return cm.getBlack(lambda);
}
}
}