colorhelper.java

来自「测试工具」· Java 代码 · 共 66 行

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.jmeter.util;

import java.awt.Color;

/**
 * This class contains the static utility methods to manipulate colors.
 * 
 * @author Khor Soon Hin Created 2001/08/13
 * @version $Revision: 493779 $ $Date: 2007-01-07 17:46:38 +0000 (Sun, 07 Jan 2007) $
 */
public final class ColorHelper {
	/**
	 * Private constructor to prevent instantiation.
	 */
	private ColorHelper() {
	}

	/**
	 * Given the <code>Color</code>, get the red, green and blue components.
	 * Increment the lowest of the components by the indicated increment value.
	 * If all the components are the same value increment in the order of red,
	 * green and blue.
	 * 
	 * @param inc
	 *            value to increment the color components
	 * @return the color after change
	 */
	public static Color changeColorCyclicIncrement(Color col, int inc) {
		int red = col.getRed();
		int green = col.getGreen();
		int blue = col.getBlue();
		int temp1 = Math.min(red, green);
		int temp2 = Math.min(temp1, blue);
		// now temp2 has the lowest of the three components
		if (red == temp2) {
			red += inc;
			red %= 256;
		} else if (green == temp2) {
			green += inc;
			green %= 256;
		} else if (blue == temp2) {
			blue += inc;
			blue %= 256;
		}
		return new Color(red, green, blue);
	}
}