WindingRule.java

/*
 *
 * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package java2d.demos.Paths;


import static java.awt.Color.BLACK;
import static java.awt.Color.LIGHT_GRAY;
import static java.awt.Color.WHITE;
import java.awt.Graphics2D;
import java.awt.geom.GeneralPath;
import java.awt.geom.Path2D;
import java2d.Surface;


/**
 * Rectangles filled to illustrate the GenerPath winding rule, determining
 * the interior of a path.
 */
@SuppressWarnings("serial")
public class WindingRule extends Surface {

    public WindingRule() {
        setBackground(WHITE);
    }

    @Override
    public void render(int w, int h, Graphics2D g2) {

        g2.translate(w * .2, h * .2);

        GeneralPath p = new GeneralPath(Path2D.WIND_NON_ZERO);
        p.moveTo(0.0f, 0.0f);
        p.lineTo(w * .5f, 0.0f);
        p.lineTo(w * .5f, h * .2f);
        p.lineTo(0.0f, h * .2f);
        p.closePath();

        p.moveTo(w * .05f, h * .05f);
        p.lineTo(w * .55f, h * .05f);
        p.lineTo(w * .55f, h * .25f);
        p.lineTo(w * .05f, h * .25f);
        p.closePath();

        g2.setColor(LIGHT_GRAY);
        g2.fill(p);
        g2.setColor(BLACK);
        g2.draw(p);
        g2.drawString("NON_ZERO rule", 0, -5);

        g2.translate(0.0f, h * .45);

        p.setWindingRule(Path2D.WIND_EVEN_ODD);
        g2.setColor(LIGHT_GRAY);
        g2.fill(p);
        g2.setColor(BLACK);
        g2.draw(p);
        g2.drawString("EVEN_ODD rule", 0, -5);
    }

    public static void main(String[] s) {
        createDemoFrame(new WindingRule());
    }
}