/**
* 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.shader;
import ca.eandb.jmist.framework.Shader;
import ca.eandb.jmist.framework.ShadingContext;
import ca.eandb.jmist.framework.color.Color;
import ca.eandb.jmist.framework.color.Spectrum;
import ca.eandb.jmist.framework.color.WavelengthPacket;
import ca.eandb.jmist.math.Interval;
/**
* @author brad
*
*/
public final class DistanceShader implements Shader {
/**
* Serialization version ID.
*/
private static final long serialVersionUID = -6744005479057812858L;
private final Interval distanceInterval;
private final Spectrum minDistanceValue;
private final Spectrum maxDistanceValue;
private final Spectrum nearValue;
private final Spectrum farValue;
/**
* @param distanceInterval
* @param minDistanceValue
* @param maxDistanceValue
* @param nearValue
* @param farValue
*/
public DistanceShader(Interval distanceInterval, Spectrum minDistanceValue, Spectrum maxDistanceValue,
Spectrum nearValue, Spectrum farValue) {
this.distanceInterval = distanceInterval;
this.minDistanceValue = minDistanceValue;
this.maxDistanceValue = maxDistanceValue;
this.nearValue = nearValue;
this.farValue = farValue;
}
/**
* @param distanceInterval
* @param minDistanceValue
* @param maxDistanceValue
*/
public DistanceShader(Interval distanceInterval, Spectrum minDistanceValue, Spectrum maxDistanceValue) {
this(distanceInterval, minDistanceValue, maxDistanceValue, minDistanceValue, maxDistanceValue);
}
/**
* @param distanceInterval
*/
public DistanceShader(Interval distanceInterval) {
this(distanceInterval, null, null);
}
/**
* @param maxDistance
*/
public DistanceShader(double maxDistance) {
this(new Interval(0, maxDistance));
}
/* (non-Javadoc)
* @see ca.eandb.jmist.framework.Shader#shade(ca.eandb.jmist.framework.ShadingContext)
*/
public Color shade(ShadingContext sc) {
WavelengthPacket lambda = sc.getWavelengthPacket();
double d = sc.getDistance();
if (distanceInterval.contains(d)) {
double t = (d - distanceInterval.minimum()) / distanceInterval.length();
Color ncol = getColorWhiteDefault(minDistanceValue, lambda);
Color fcol = getColorBlackDefault(maxDistanceValue, lambda);
return ncol.times(1.0 - t).plus(fcol.times(t));
} else if (d < distanceInterval.minimum()) {
return getColorWhiteDefault(nearValue, lambda);
} else {
return getColorBlackDefault(farValue, lambda);
}
}
public Color getColorWhiteDefault(Spectrum s, WavelengthPacket lambda) {
return (s != null) ? s.sample(lambda) : lambda.getColorModel().getWhite(lambda);
}
public Color getColorBlackDefault(Spectrum s, WavelengthPacket lambda) {
return (s != null) ? s.sample(lambda) : lambda.getColorModel().getBlack(lambda);
}
}