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/*
* Copyright (c) 2000, 2018, 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 4388199
* @summary Tests inverse transform of an array of points with
* shearing and translation components in the AffineTransform
*/
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Point2D;
/*
* The AffineTransform method
* inverseTransform(double[],int,double[],int,int) produces incorrect
* results for pure shearing transformations or for shearing and
* translation transformations. The simpliest example of which is a
* rotation by 90 degrees.
*/
public class QuadRotInverseBug {
public static void main(String[] args) {
// First test a transform which rotates the coordinate system by 90
// degrees.
System.out.println("Using 90 degree rotation:");
AffineTransform xform = AffineTransform.getRotateInstance(Math.PI/2);
boolean test1failed = test(xform);
// Next test the transform with an added translation component
System.out.println("Using 90 degree rotation with translation:");
xform.translate(2,2);
boolean test2failed = test(xform);
if (test1failed || test2failed) {
throw new RuntimeException("test failed, see printout");
}
}
public static boolean test(AffineTransform xform) {
// Make needed arrays.
double[] originalPoint = new double[2];
double[] transformedPoint = new double[2];
double[] inverseFromOriginalXForm = new double[2];
Point2D originalPoint2D = new Point2D.Double();
Point2D transformedPoint2D = new Point2D.Double();
Point2D inverseFromOriginalPoint2D = new Point2D.Double();
// Make the original point to check (x,y)=(1,1).
originalPoint[0] = 1.;
originalPoint[1] = 1.;
try {
originalPoint2D.setLocation(originalPoint[0], originalPoint[1]);
// Make the transformed point.
xform.transform(originalPoint,0,transformedPoint,0,1);
xform.transform(originalPoint2D, transformedPoint2D);
// Transform the point back using the original transformation.
xform.inverseTransform(transformedPoint,0,
inverseFromOriginalXForm,0,1);
xform.inverseTransform(transformedPoint2D,
inverseFromOriginalPoint2D);
} catch (NoninvertibleTransformException e) {
throw new InternalError("transform wasn't invertible!");
}
System.out.println("Both points should be identical:");
System.out.println("Original Point: "+
originalPoint[0]+" "+
originalPoint[1]);
System.out.println("inverseTransform method used: "+
inverseFromOriginalXForm[0]+" "+
inverseFromOriginalXForm[1]);
System.out.println("Original Point2D: "+ originalPoint2D);
System.out.println("inverseTransform method used: "+
inverseFromOriginalPoint2D);
return (originalPoint[0] != inverseFromOriginalXForm[0] ||
originalPoint[1] != inverseFromOriginalXForm[1] ||
!originalPoint2D.equals(inverseFromOriginalPoint2D));
}
}
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