/* | |
* Copyright (C) 1999 Antti Koivisto (koivisto@kde.org) | |
* Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. | |
* | |
* This library is free software; you can redistribute it and/or | |
* modify it under the terms of the GNU Library General Public | |
* License as published by the Free Software Foundation; either | |
* version 2 of the License, or (at your option) any later version. | |
* | |
* This library 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 | |
* Library General Public License for more details. | |
* | |
* You should have received a copy of the GNU Library General Public License | |
* along with this library; see the file COPYING.LIB. If not, write to | |
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
* Boston, MA 02110-1301, USA. | |
* | |
*/ | |
#include "config.h" | |
#include "RotateTransformOperation.h" | |
#include <algorithm> | |
#include <wtf/MathExtras.h> | |
using namespace std; | |
namespace WebCore { | |
PassRefPtr<TransformOperation> RotateTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity) | |
{ | |
if (from && !from->isSameType(*this)) | |
return this; | |
if (blendToIdentity) | |
return RotateTransformOperation::create(m_x, m_y, m_z, m_angle - m_angle * progress, m_type); | |
const RotateTransformOperation* fromOp = static_cast<const RotateTransformOperation*>(from); | |
// Optimize for single axis rotation | |
if (!fromOp || (fromOp->m_x == 0 && fromOp->m_y == 0 && fromOp->m_z == 1) || | |
(fromOp->m_x == 0 && fromOp->m_y == 1 && fromOp->m_z == 0) || | |
(fromOp->m_x == 1 && fromOp->m_y == 0 && fromOp->m_z == 0)) { | |
double fromAngle = fromOp ? fromOp->m_angle : 0; | |
return RotateTransformOperation::create(fromOp ? fromOp->m_x : m_x, | |
fromOp ? fromOp->m_y : m_y, | |
fromOp ? fromOp->m_z : m_z, | |
fromAngle + (m_angle - fromAngle) * progress, m_type); | |
} | |
const RotateTransformOperation* toOp = this; | |
// Create the 2 rotation matrices | |
TransformationMatrix fromT; | |
TransformationMatrix toT; | |
fromT.rotate3d((float)(fromOp ? fromOp->m_x : 0), | |
(float)(fromOp ? fromOp->m_y : 0), | |
(float)(fromOp ? fromOp->m_z : 1), | |
(float)(fromOp ? fromOp->m_angle : 0)); | |
toT.rotate3d((float)(toOp ? toOp->m_x : 0), | |
(float)(toOp ? toOp->m_y : 0), | |
(float)(toOp ? toOp->m_z : 1), | |
(float)(toOp ? toOp->m_angle : 0)); | |
// Blend them | |
toT.blend(fromT, progress); | |
// Extract the result as a quaternion | |
TransformationMatrix::DecomposedType decomp; | |
toT.decompose(decomp); | |
// Convert that to Axis/Angle form | |
double x = -decomp.quaternionX; | |
double y = -decomp.quaternionY; | |
double z = -decomp.quaternionZ; | |
double length = sqrt(x * x + y * y + z * z); | |
double angle = 0; | |
if (length > 0.00001) { | |
x /= length; | |
y /= length; | |
z /= length; | |
angle = rad2deg(acos(decomp.quaternionW) * 2); | |
} else { | |
x = 0; | |
y = 0; | |
z = 1; | |
} | |
return RotateTransformOperation::create(x, y, z, angle, ROTATE_3D); | |
} | |
} // namespace WebCore |