/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.plotter.charts;

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

import org.jfree.chart.renderer.category.BarRenderer;

import com.rapidminer.gui.plotter.ColorProvider;
import com.rapidminer.tools.math.MathFunctions;

/** 
 * Paints the bars in colorized Rapid-I style. 
 * 
 * @author Ingo Mierswa
 */
public class ColorizedBarRenderer extends BarRenderer {

	private static final long serialVersionUID = 5262078816286731693L;

	private double[] colorValues;
	
	private double minColor;
	
	private double maxColor;

	private ColorProvider colorProvider = new ColorProvider();
	
	
	public ColorizedBarRenderer(double[] colorValues) {
		this.colorValues = colorValues;
		this.minColor = Double.POSITIVE_INFINITY;
		this.maxColor = Double.NEGATIVE_INFINITY;
		if (this.colorValues != null) {
			for (double d : this.colorValues) {
				this.minColor = MathFunctions.robustMin(this.minColor, d);
				this.maxColor = MathFunctions.robustMax(this.maxColor, d);
			}	
		}	
	}
	
	@Override
	public Paint getItemPaint(int series, int item) {
		if ((colorValues == null) || (minColor == maxColor)) {
			return Color.RED;
		} else {
			double normalized = (colorValues[item] - minColor) / (maxColor - minColor);
			return colorProvider.getPointColor(normalized);
		}		
	}
}