1/*
2 * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
3 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#include "config.h"
23#include "RotateTransformOperation.h"
24
25#include "AnimationUtilities.h"
26#include <algorithm>
27#include <wtf/MathExtras.h>
28#include <wtf/text/TextStream.h>
29
30namespace WebCore {
31
32bool RotateTransformOperation::operator==(const TransformOperation& other) const
33{
34 if (!isSameType(other))
35 return false;
36 const RotateTransformOperation& r = downcast<RotateTransformOperation>(other);
37 return m_x == r.m_x && m_y == r.m_y && m_z == r.m_z && m_angle == r.m_angle;
38}
39
40Ref<TransformOperation> RotateTransformOperation::blend(const TransformOperation* from, double progress, bool blendToIdentity)
41{
42 if (from && !from->isSameType(*this))
43 return *this;
44
45 if (blendToIdentity)
46 return RotateTransformOperation::create(m_x, m_y, m_z, m_angle - m_angle * progress, type());
47
48 const RotateTransformOperation* fromOp = downcast<RotateTransformOperation>(from);
49
50 // Optimize for single axis rotation
51 if (!fromOp || (fromOp->m_x == 0 && fromOp->m_y == 0 && fromOp->m_z == 1) ||
52 (fromOp->m_x == 0 && fromOp->m_y == 1 && fromOp->m_z == 0) ||
53 (fromOp->m_x == 1 && fromOp->m_y == 0 && fromOp->m_z == 0)) {
54 double fromAngle = fromOp ? fromOp->m_angle : 0;
55 return RotateTransformOperation::create(fromOp ? fromOp->m_x : m_x,
56 fromOp ? fromOp->m_y : m_y,
57 fromOp ? fromOp->m_z : m_z,
58 WebCore::blend(fromAngle, m_angle, progress), type());
59 }
60
61 const RotateTransformOperation* toOp = this;
62
63 // Create the 2 rotation matrices
64 TransformationMatrix fromT;
65 TransformationMatrix toT;
66 fromT.rotate3d((fromOp ? fromOp->m_x : 0),
67 (fromOp ? fromOp->m_y : 0),
68 (fromOp ? fromOp->m_z : 1),
69 (fromOp ? fromOp->m_angle : 0));
70
71 toT.rotate3d((toOp ? toOp->m_x : 0),
72 (toOp ? toOp->m_y : 0),
73 (toOp ? toOp->m_z : 1),
74 (toOp ? toOp->m_angle : 0));
75
76 // Blend them
77 toT.blend(fromT, progress);
78
79 // Extract the result as a quaternion
80 TransformationMatrix::Decomposed4Type decomp;
81 toT.decompose4(decomp);
82
83 // Convert that to Axis/Angle form
84 double x = -decomp.quaternionX;
85 double y = -decomp.quaternionY;
86 double z = -decomp.quaternionZ;
87 double length = sqrt(x * x + y * y + z * z);
88 double angle = 0;
89
90 if (length > 0.00001) {
91 x /= length;
92 y /= length;
93 z /= length;
94 angle = rad2deg(acos(decomp.quaternionW) * 2);
95 } else {
96 x = 0;
97 y = 0;
98 z = 1;
99 }
100 return RotateTransformOperation::create(x, y, z, angle, ROTATE_3D);
101}
102
103void RotateTransformOperation::dump(TextStream& ts) const
104{
105 ts << type() << "(" << TextStream::FormatNumberRespectingIntegers(m_x) << ", " << TextStream::FormatNumberRespectingIntegers(m_y) << ", " << TextStream::FormatNumberRespectingIntegers(m_z) << ", " << TextStream::FormatNumberRespectingIntegers(m_angle) << "deg)";
106}
107
108} // namespace WebCore
109