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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Design Tooling
**
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "animationcurve.h"
#include <assert.h>
#include <cmath>
namespace DesignTools {
Keyframe::Keyframe()
: m_position()
, m_leftHandle()
, m_rightHandle()
{}
Keyframe::Keyframe(const QPointF &position)
: m_position(position)
, m_leftHandle()
, m_rightHandle()
{}
Keyframe::Keyframe(const QPointF &position, const QPointF &leftHandle, const QPointF &rightHandle)
: m_position(position)
, m_leftHandle(leftHandle)
, m_rightHandle(rightHandle)
{}
bool Keyframe::hasLeftHandle() const
{
return !m_leftHandle.isNull();
}
bool Keyframe::hasRightHandle() const
{
return !m_rightHandle.isNull();
}
QPointF Keyframe::position() const
{
return m_position;
}
QPointF Keyframe::leftHandle() const
{
return m_leftHandle;
}
QPointF Keyframe::rightHandle() const
{
return m_rightHandle;
}
void Keyframe::setPosition(const QPointF &pos)
{
m_position = pos;
}
void Keyframe::setLeftHandle(const QPointF &pos)
{
m_leftHandle = pos;
}
void Keyframe::setRightHandle(const QPointF &pos)
{
m_rightHandle = pos;
}
CurveSegment::CurveSegment()
: m_left()
, m_right()
{}
CurveSegment::CurveSegment(const Keyframe &left, const Keyframe &right)
: m_left(left)
, m_right(right)
{}
QPointF CurveSegment::evaluate(double t) const
{
assert(t >= 0. && t <= 1.);
const double it = 1.0 - t;
auto binomialPolynomial = [t, it](double p0, double p1, double p2, double p3) {
return p0 * std::pow(it, 3.0) + p1 * 3.0 * std::pow(it, 2.0) * t
+ p2 * 3.0 * it * std::pow(t, 2.0) + p3 * std::pow(t, 3.0);
};
const double x = binomialPolynomial(
m_left.position().x(), m_left.rightHandle().x(),
m_right.leftHandle().x(), m_right.position().x());
const double y = binomialPolynomial(
m_left.position().y(), m_left.rightHandle().y(),
m_right.leftHandle().y(), m_right.position().y());
return QPointF(x, y);
}
AnimationCurve::AnimationCurve()
: m_frames()
{}
AnimationCurve::AnimationCurve(const std::vector<Keyframe> &frames)
: m_frames(frames)
{}
bool AnimationCurve::isValid() const
{
return !m_frames.empty();
}
std::vector<Keyframe> AnimationCurve::keyframes() const
{
return m_frames;
}
} // End namespace DesignTools.
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