GradientPainter.java

/*
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.flexdock.plaf.resources.paint;

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JComponent;

import org.flexdock.util.SwingUtility;

/**
 * @author Cyril Gambis
 * @author Claudio Romano
 */
public class GradientPainter extends DefaultPainter {

    public static final String GRAYSCALE = "grayscale";

    @Override
    public void paint(Graphics g, int width, int height, boolean active, JComponent titlebar) {
        int mid = width / 2;

        Color backgroundColor = getBackgroundColor(active);

        double myDarkFactor = 0.3;
        double myNormalFactor = 0.75;
        double myLightFactor = 0.85;

        Color gradStartColor = SwingUtility.darker(backgroundColor, myDarkFactor);
        Color gradMidColor = SwingUtility.darker(backgroundColor, myNormalFactor);
        Color gradEndColor = SwingUtility.darker(backgroundColor, myLightFactor);

        GradientPaint firstHalf;
        GradientPaint secondHalf;

        //         fill up the whole width if we're active
        if (active) {
            firstHalf = new GradientPaint(0, height, gradStartColor, mid, height, gradMidColor);
            secondHalf = new GradientPaint(mid, height, gradMidColor, width, height, gradEndColor);
        } else {
            // otherwise, fill up the center part and draw an outline
            if (useGrayScale(titlebar)) {
                firstHalf = new GradientPaint(0, height, SwingUtility.grayScale(gradMidColor).brighter(), mid, height, SwingUtility.grayScale(backgroundColor));
                secondHalf = new GradientPaint(mid, height, SwingUtility.grayScale(backgroundColor), width, height, SwingUtility.grayScale(gradEndColor).brighter());

            } else {
                firstHalf = new GradientPaint(0, height, backgroundColor, mid, height, backgroundColor);
                secondHalf = new GradientPaint(mid, height, backgroundColor, width, height, backgroundColor);
            }
        }

        Graphics2D g2 = (Graphics2D) g;
        g2.setPaint(firstHalf);
        g2.fillRect(1, 1, mid, height - 2);
        g2.setPaint(secondHalf);
        g2.fillRect(mid, 1, width, height - 2);
    }


    private boolean useGrayScale(JComponent titlebar) {
        return painterResource.getInt( GRAYSCALE) == 1;
    }

}