Parses a color instance from the given hex string. - Java 2D Graphics

Java examples for 2D Graphics:Color String

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Description

Parses a color instance from the given hex string.

Demo Code

/**//from w w w .j a  v a  2  s  .co m
 * This class offers a few utility methods useful when handling Colors.
 * <p/>
 * <hr/> Copyright 2006-2012 Torsten Heup
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 com.java2s;
import java.awt.*;

public class Main {
    public static void main(String[] argv) throws Exception {
        String string = "java2s.com";
        System.out.println(fromHexString(string));
    }

    /**
     * Parses a color instance from the given hex string.
     *
     * @param string string to parse color value from.
     * @return a color instance parsed from the given hex string.
     */
    public static Color fromHexString(final String string) {
        if (string == null)
            throw new IllegalArgumentException(
                    "Parameter 'string' must not be null!");

        final int color = Integer.parseInt(string, 16);
        return new Color(color, color > 0xFFFFFF);
    }

    /**
     * Parses a color instance from the given hex string and replaces its alpha value with the given parameter.
     *
     * @param string string to parse color value from.
     * @param alpha  the alpha value to apply to the color.
     * @return a color instance parsed from the given hex string.
     */
    public static Color fromHexString(final String string, final int alpha) {
        if (string == null)
            throw new IllegalArgumentException(
                    "Parameter 'string' must not be null!");
        if (alpha < 0 || alpha > 255)
            throw new IllegalArgumentException("Illegal alpha value: "
                    + alpha + ", expected a value between 0 and 255");

        final int color = (Integer.parseInt(string, 16) & 0xFFFFFF)
                | (alpha << 24);
        return new Color(color, true);
    }
}

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