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BoofCV is an open source Java library for real-time computer vision and robotics applications.

There is a newer version: 1.1.7

/*
 * Copyright (c) 2011-2019, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package boofcv.visualize;

/**
 * Generates colors based on value along one axis. A triangle wave is used.
 *
 * @author Peter Abeles
 */
public abstract class SingleAxisRgb extends PeriodicColorizer {

	private static final int HV = 255;
	private static final int LV = 0;

	final int color( double val ) {
		double f = triangleWave(val);
		double a=(1-f)/0.25;	//invert and group
		int X=(int)Math.floor(a);	//this is the integer part
		int Y=(int)Math.floor(HV*(a-X)); //fractional part from 0 to 255

		int r,g,b;
		switch(X) {
			case 0: r=HV;  g=Y;   b=LV;break;
			case 1: r=HV-Y;g=HV;  b=LV;break;
			case 2: r=LV;  g=HV;  b=Y;break;
			case 3: r=LV;  g=HV-Y;b=HV;break;
			case 4: r=LV;  g=LV;  b=HV;break;
			default:
				throw new RuntimeException("BUG! X="+X+"  f="+f);
		}
		return (r << 16) | (g <<8) | b;
	}

	public static class X extends SingleAxisRgb {
		@Override
		public int color(int index, double x, double y, double z) {
			return color(x);
		}
	}

	public static class Y extends SingleAxisRgb {
		@Override
		public int color(int index, double x, double y, double z) {
			return color(y);
		}
	}

	public static class Z extends SingleAxisRgb {
		@Override
		public int color(int index, double x, double y, double z) {
			return color(z);
		}
	}
}