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/*
* Copyright (c) 2001, 2024, 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 4516037
* @summary verify that scaled Polygons honor the transform
*/
import java.awt.Color;
import static java.awt.Color.*;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.image.BufferedImage;
public class ScaledPolyTest {
public static void main(String[] args) {
Polygon poly = new Polygon();
poly.addPoint(20, 10);
poly.addPoint(30, 30);
poly.addPoint(10, 30);
poly.addPoint(20, 10);
int height = 300;
int width = 300;
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = bi.createGraphics();
g2d.setColor(Color.white);
g2d.fillRect(0, 0, bi.getWidth(), bi.getHeight());
g2d.translate(10, 10);
g2d.scale(2, 2);
g2d.setColor(Color.yellow);
g2d.fill(poly);
g2d.setColor(Color.blue);
g2d.draw(poly);
/*
* Examine each row of the image.
* If the stroked polygon is correctly aligned on the filled polygon,
* if there is anything except white on the line,
* the transition will always be white+->blue+->yellow*->blue*->white+
*/
int bluePix = blue.getRGB();
int yellowPix = yellow.getRGB();
int whitePix = white.getRGB();
for (int y = 0; y < height; y++ ) {
int x = 0;
int pix = whitePix;
while (pix == whitePix && x < width) pix = bi.getRGB(x++, y);
if (pix == whitePix && x == width) continue; // all white row.
if (pix != bluePix) throw new RuntimeException("Expected blue");
while (pix == bluePix) pix = bi.getRGB(x++, y);
if (pix == yellowPix) {
while (pix == yellowPix) pix = bi.getRGB(x++, y);
if (pix != bluePix) throw new RuntimeException("Expected blue");
while (pix == bluePix) pix = bi.getRGB(x++, y);
if (pix != whitePix) throw new RuntimeException("Expected white");
}
while (pix == whitePix && x < width) pix = bi.getRGB(x++, y);
if (pix == whitePix && x == width) {
continue;
} else {
throw new RuntimeException("Expected white to finish the row");
}
}
}
}
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