ch.zhaw.ias.dito.ui.util.ColorPaintScale.java Source code

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Here is the source code for ch.zhaw.ias.dito.ui.util.ColorPaintScale.java

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/* released under bsd licence
 * see LICENCE file or http://www.opensource.org/licenses/bsd-license.php for details
 * Institute of Applied Simulation (ZHAW)
 * Author Thomas Niederberger
 */
package ch.zhaw.ias.dito.ui.util;

import java.awt.Color;
import java.awt.Paint;

import org.jfree.chart.renderer.PaintScale;

/**
 * A Color scale supporting a color range from red to blue on the HSB color space. 
 * @author Thomas Niederberger (nith) - institute of applied simulation (IAS)
 */
public class ColorPaintScale implements PaintScale {
    private double lowerBound;
    private double upperBound;
    private double step;

    public ColorPaintScale(double lowerBound, double upperBound) {
        this.lowerBound = lowerBound;
        this.upperBound = upperBound;
        //0.666 is chosen because this will deliver a blue color for the upper bound.
        this.step = 0.666 / (upperBound - lowerBound);
    }

    @Override
    public Paint getPaint(double value) {
        return Color.getHSBColor((float) (step * (value - lowerBound)), 1.0f, 1.0f);
    }

    @Override
    public double getLowerBound() {
        return lowerBound;
    }

    @Override
    public double getUpperBound() {
        return upperBound;
    }
}