/*

 * Copyright (C) 2005, 2006 Apple Computer, Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#include "config.h"

#include "AffineTransform.h"

#include "FloatRect.h"

#include "IntRect.h"

#include <math.h>

namespace WebCore {

const double deg2rad = 0.017453292519943295769; // pi/180

bool AffineTransform::isInvertible() const

{

    return det() != 0.0;

}

AffineTransform& AffineTransform::multiply(const AffineTransform& other)

{

    return (*this) *= other;

}

AffineTransform& AffineTransform::scale(double s)

{

    return scale(s, s);

}

AffineTransform& AffineTransform::scaleNonUniform(double sx, double sy)

{

    return scale(sx, sy);

}

AffineTransform& AffineTransform::rotateFromVector(double x, double y)

{

    return rotate(atan2(y, x) / deg2rad);

}

AffineTransform& AffineTransform::flipX()

{

    return scale(-1.0f, 1.0f);

}

AffineTransform& AffineTransform::flipY()

{

    return scale(1.0f, -1.0f);

}

AffineTransform& AffineTransform::skewX(double angle)

{

    return shear(tan(angle * deg2rad), 0.0f);

}

AffineTransform& AffineTransform::skewY(double angle)

{

    return shear(0.0f, tan(angle * deg2rad));

}

}