Quelle InsetClipping.java Sprache: JAVA

/*
* Copyright (c) 2003, 2020, 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
* @key headful
* @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.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.geom.Area;
import java.awt.image.BufferedImage;

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.setLocationRelativeTo(null);
        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(2, 2);
            clipTest.dispose();
            if ((new Color(pixelVal)).equals(fillColor)) {
                System.out.println("Passed");
            } else {
                throw new Error("Failed: incorrect color in pixel (2, 2)");
            }
        } catch (Exception e) {
            System.out.println("Problems creating Robot");
        }
    }
}

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