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Java example source code file (InsetClipping.java)

This example Java source code file (InsetClipping.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

area, awt, bufferedimage, color, error, exception, failed, frame, geometry, graphics, image, insetclipping, insets, interruptedexception, point, rectangle, robot

The InsetClipping.java Java example source code

/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/**
 * @test
 * @bug 4873505 6588884
 * @author cheth
 * @summary verifies that drawImage behaves the bounds of a complex
 * clip shape.  This was a problem with our GDI renderer on Windows, where
 * we would ignore the window insets.
 * @run main InsetClipping
*/

/**
 * This test works by setting up a clip area that equals the visible area
 * of the Frame.  When we perform any rendering operation to that window,
 * we should not see the results of the operation because they should be
 * clipped out.  We create an Image with one color (red) and use a
 * different background fill color (blue).  We fill the area with the
 * background color, then set the clip, then draw the image; if we detect
 * the image color at pixel (0, 0) then we did not clip correctly and the
 * test fails.
 */

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;


public class InsetClipping extends Frame {
    BufferedImage image;
    Area area;
    static boolean painted = false;
    static Color imageColor = Color.red;
    static Color fillColor = Color.blue;

    public InsetClipping() {

        image  = new BufferedImage( 300, 300,BufferedImage.TYPE_INT_RGB);
        Graphics g2 = image.createGraphics();
        g2.setColor(imageColor);
        g2.fillRect(0,0, 300,300);
    }

    public void paint(Graphics g) {
        Insets insets = getInsets();
        area = new Area( new Rectangle(0,0, getWidth(), getHeight()));
        area.subtract(new Area(new Rectangle(insets.left, insets.top,
                                      getWidth() - insets.right,
                                      getHeight() - insets.bottom)));
        g.setColor(fillColor);
        g.fillRect(0, 0, getWidth(), getHeight());
        g.setClip(area);
        g.drawImage(image, 0, 0, null);
        painted = true;
    }

    public static void main(String args[]) {
        InsetClipping clipTest = new InsetClipping();
        clipTest.setSize(300, 300);
        clipTest.setVisible(true);
        while (!painted) {
            try {
                Thread.sleep(100);
            } catch (Exception e) {}
        }
        try {
            Thread.sleep(2000);
        } catch (InterruptedException ex) {}
        try {
            Robot robot = new Robot();
            Point clientLoc = clipTest.getLocationOnScreen();
            Insets insets = clipTest.getInsets();
            clientLoc.x += insets.left;
            clientLoc.y += insets.top;
            BufferedImage clientPixels =
                robot.createScreenCapture(new Rectangle(clientLoc.x,
                                                        clientLoc.y,
                                                        clientLoc.x + 2,
                                                        clientLoc.y + 2));
            try {
                Thread.sleep(2000);
            } catch (Exception e) {}
            int pixelVal = clientPixels.getRGB(0, 0);
            clipTest.dispose();
            if ((new Color(pixelVal)).equals(fillColor)) {
                System.out.println("Passed");
            } else {
                throw new Error("Failed: incorrect color in pixel (0, 0)");
            }
        } catch (Exception e) {
            System.out.println("Problems creating Robot");
        }
    }
}

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