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/****************************************************************************
**
** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "fcurve_p.h"
#include <private/bezierevaluator_p.h>
#include <QtCore/qjsonarray.h>
#include <QtCore/qjsonobject.h>
#include <QtCore/QLatin1String>
QT_BEGIN_NAMESPACE
namespace Qt3DAnimation {
namespace Animation {
FCurve::FCurve()
: m_rangeFinder(m_localTimes)
{
}
float FCurve::evaluateAtTime(float localTime) const
{
// TODO: Implement extrapolation beyond first/last keyframes
if (localTime < m_localTimes.first()) {
return m_keyframes.first().value;
} else if (localTime > m_localTimes.last()) {
return m_keyframes.last().value;
} else {
// Find keyframes that sandwich the requested localTime
const int idx = m_rangeFinder.findLowerBound(localTime);
const float t0 = m_localTimes[idx];
const float t1 = m_localTimes[idx + 1];
const Keyframe &keyframe0(m_keyframes[idx]);
const Keyframe &keyframe1(m_keyframes[idx + 1]);
switch (keyframe0.interpolation) {
case QKeyFrame::ConstantInterpolation:
qWarning("Constant interpolation not implemented yet");
break;
case QKeyFrame::LinearInterpolation:
if (localTime >= t0 && localTime <= t1 && t1 > t0) {
float t = (localTime - t0) / (t1 - t0);
return (1 - t) * keyframe0.value + t * keyframe1.value;
}
break;
case QKeyFrame::BezierInterpolation:
{
BezierEvaluator evaluator(t0, keyframe0, t1, keyframe1);
return evaluator.valueForTime(localTime);
}
default:
qWarning("Unknown interpolation type %d", keyframe0.interpolation);
break;
}
}
return m_keyframes.first().value;
}
float FCurve::startTime() const
{
if (!m_localTimes.isEmpty())
return m_localTimes.first();
return 0.0f;
}
float FCurve::endTime() const
{
if (!m_localTimes.isEmpty())
return m_localTimes.last();
return 0.0f;
}
void FCurve::appendKeyframe(float localTime, const Keyframe &keyframe)
{
m_localTimes.append(localTime);
m_keyframes.append(keyframe);
}
void FCurve::read(const QJsonObject &json)
{
clearKeyframes();
const QJsonArray keyframeArray = json[QLatin1String("keyFrames")].toArray();
const int keyframeCount = keyframeArray.size();
for (int i = 0; i < keyframeCount; ++i) {
const QJsonObject keyframeData = keyframeArray.at(i).toObject();
// Extract the keyframe local time and value
const QJsonArray keyframeCoords = keyframeData[QLatin1String("coords")].toArray();
float localTime = keyframeCoords.at(0).toDouble();
Keyframe keyframe;
keyframe.value = keyframeCoords.at(1).toDouble();
if (keyframeData.contains(QLatin1String("leftHandle"))) {
keyframe.interpolation = QKeyFrame::BezierInterpolation;
const QJsonArray leftHandle = keyframeData[QLatin1String("leftHandle")].toArray();
keyframe.leftControlPoint[0] = leftHandle.at(0).toDouble();
keyframe.leftControlPoint[1] = leftHandle.at(1).toDouble();
const QJsonArray rightHandle = keyframeData[QLatin1String("rightHandle")].toArray();
keyframe.rightControlPoint[0] = rightHandle.at(0).toDouble();
keyframe.rightControlPoint[1] = rightHandle.at(1).toDouble();
} else {
keyframe.interpolation = QKeyFrame::LinearInterpolation;
}
appendKeyframe(localTime, keyframe);
}
// TODO: Ensure beziers have no loops or cusps by scaling the control points
// back so they do not interset.
}
void FCurve::setFromQChannelComponent(const QChannelComponent &qcc)
{
clearKeyframes();
for (const auto &frontendKeyFrame : qcc) {
// Extract the keyframe local time and value
const float localTime = frontendKeyFrame.coordinates()[0];
Keyframe keyFrame;
keyFrame.interpolation = frontendKeyFrame.interpolationType();
keyFrame.value = frontendKeyFrame.coordinates()[1];
keyFrame.leftControlPoint = frontendKeyFrame.leftControlPoint();
keyFrame.rightControlPoint = frontendKeyFrame.rightControlPoint();
appendKeyframe(localTime, keyFrame);
}
// TODO: Ensure beziers have no loops or cusps by scaling the control points
// back so they do not interset.
}
void ChannelComponent::read(const QJsonObject &json)
{
name = json[QLatin1String("channelComponentName")].toString();
fcurve.read(json);
}
void ChannelComponent::setFromQChannelComponent(const QChannelComponent &qcc)
{
name = qcc.name();
fcurve.setFromQChannelComponent(qcc);
}
void Channel::read(const QJsonObject &json)
{
name = json[QLatin1String("channelName")].toString();
const QJsonArray channelComponentsArray = json[QLatin1String("channelComponents")].toArray();
const int channelCount = channelComponentsArray.size();
channelComponents.resize(channelCount);
for (int i = 0; i < channelCount; ++i) {
const QJsonObject channel = channelComponentsArray.at(i).toObject();
channelComponents[i].read(channel);
}
}
void Channel::setFromQChannel(const QChannel &qch)
{
name = qch.name();
channelComponents.resize(qch.channelComponentCount());
int i = 0;
for (const auto &frontendChannelComponent : qch)
channelComponents[i++].setFromQChannelComponent(frontendChannelComponent);
}
} // namespace Animation
} // namespace Qt3DAnimation
QT_END_NAMESPACE
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