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AffineTransform.cpp

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00001 /*
00002  * Copyright (C) 2005, 2006 Apple Computer, Inc.  All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  * 1. Redistributions of source code must retain the above copyright
00008  *    notice, this list of conditions and the following disclaimer.
00009  * 2. Redistributions in binary form must reproduce the above copyright
00010  *    notice, this list of conditions and the following disclaimer in the
00011  *    documentation and/or other materials provided with the distribution.
00012  *
00013  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
00014  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00015  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
00016  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
00017  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00018  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00019  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00020  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
00021  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00022  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00023  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
00024  */
00025 
00026 #include "config.h"
00027 #include "wtf/Platform.h"
00028 #include "AffineTransform.h"
00029 
00030 #include "FloatRect.h"
00031 #include "IntRect.h"
00032 
00033 #include <wtf/MathExtras.h>
00034 
00035 namespace WebCore {
00036 
00037 bool AffineTransform::isInvertible() const
00038 {
00039     return det() != 0.0;
00040 }
00041 
00042 AffineTransform& AffineTransform::multiply(const AffineTransform& other)
00043 {
00044     return (*this) *= other;
00045 }
00046 
00047 AffineTransform& AffineTransform::scale(double s)
00048 {
00049     return scale(s, s);
00050 }
00051 
00052 AffineTransform& AffineTransform::scaleNonUniform(double sx, double sy)
00053 {
00054     return scale(sx, sy);
00055 }
00056 
00057 AffineTransform& AffineTransform::rotateFromVector(double x, double y)
00058 {
00059     return rotate(rad2deg(atan2(y, x)));
00060 }
00061 
00062 AffineTransform& AffineTransform::flipX()
00063 {
00064     return scale(-1.0f, 1.0f);
00065 }
00066 
00067 AffineTransform& AffineTransform::flipY()
00068 {
00069     return scale(1.0f, -1.0f);
00070 }
00071 
00072 AffineTransform& AffineTransform::skew(double angleX, double angleY)
00073 {
00074     return shear(tan(deg2rad(angleX)), tan(deg2rad(angleY)));
00075 }
00076 
00077 AffineTransform& AffineTransform::skewX(double angle)
00078 {
00079     return shear(tan(deg2rad(angle)), 0.0f);
00080 }
00081 
00082 AffineTransform& AffineTransform::skewY(double angle)
00083 {
00084     return shear(0.0f, tan(deg2rad(angle)));
00085 }
00086 
00087 IntPoint AffineTransform::mapPoint(const IntPoint& point) const
00088 {
00089     double x2, y2;
00090     map(point.x(), point.y(), &x2, &y2);
00091     
00092     // Round the point.
00093     return IntPoint(lround(x2), lround(y2));
00094 }
00095 
00096 FloatPoint AffineTransform::mapPoint(const FloatPoint& point) const
00097 {
00098     double x2, y2;
00099     map(point.x(), point.y(), &x2, &y2);
00100 
00101     return FloatPoint(static_cast<float>(x2), static_cast<float>(y2));
00102 }
00103 
00104 }

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