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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qquickpathinterpolator_p.h"
#include "qquickpath_p.h"
QT_BEGIN_NAMESPACE
/*!
\qmltype PathInterpolator
\instantiates QQuickPathInterpolator
\inqmlmodule QtQuick
\ingroup qtquick-animation-control
\brief Specifies how to manually animate along a path.
PathInterpolator provides \c x, \c y, and \c angle information for a particular \c progress
along a path.
In the following example, we animate a green rectangle along a bezier path.
\snippet qml/pathinterpolator.qml 0
*/
QQuickPathInterpolator::QQuickPathInterpolator(QObject *parent) :
QObject(parent), _path(nullptr), _x(0), _y(0), _angle(0), _progress(0)
{
}
/*!
\qmlproperty Path QtQuick::PathInterpolator::path
This property holds the path to interpolate.
For more information on defining a path see the \l Path documentation.
*/
QQuickPath *QQuickPathInterpolator::path() const
{
return _path;
}
void QQuickPathInterpolator::setPath(QQuickPath *path)
{
if (_path == path)
return;
if (_path)
disconnect(_path, SIGNAL(changed()), this, SLOT(_q_pathUpdated()));
_path = path;
connect(_path, SIGNAL(changed()), this, SLOT(_q_pathUpdated()));
emit pathChanged();
}
/*!
\qmlproperty real QtQuick::PathInterpolator::progress
This property holds the current progress along the path.
Typical usage of PathInterpolator is to set the progress
(often via a NumberAnimation), and read the corresponding
values for x, y, and angle (often via bindings to these values).
Progress ranges from 0.0 to 1.0.
*/
qreal QQuickPathInterpolator::progress() const
{
return _progress;
}
void QQuickPathInterpolator::setProgress(qreal progress)
{
progress = qMin(qMax(progress, (qreal)0.0), (qreal)1.0);
if (progress == _progress)
return;
_progress = progress;
emit progressChanged();
_q_pathUpdated();
}
/*!
\qmlproperty real QtQuick::PathInterpolator::x
\qmlproperty real QtQuick::PathInterpolator::y
These properties hold the position of the path at \l progress.
*/
qreal QQuickPathInterpolator::x() const
{
return _x;
}
qreal QQuickPathInterpolator::y() const
{
return _y;
}
/*!
\qmlproperty real QtQuick::PathInterpolator::angle
This property holds the angle of the path tangent at \l progress.
Angles are reported clockwise, with zero degrees at the 3 o'clock position.
*/
qreal QQuickPathInterpolator::angle() const
{
return _angle;
}
void QQuickPathInterpolator::_q_pathUpdated()
{
if (! _path)
return;
qreal angle = 0;
const QPointF pt = _path->sequentialPointAt(_progress, &angle);
if (_x != pt.x()) {
_x = pt.x();
emit xChanged();
}
if (_y != pt.y()) {
_y = pt.y();
emit yChanged();
}
//convert to clockwise
angle = qreal(360) - angle;
if (qFuzzyCompare(angle, qreal(360)))
angle = qreal(0);
if (angle != _angle) {
_angle = angle;
emit angleChanged();
}
}
QT_END_NAMESPACE
#include "moc_qquickpathinterpolator_p.cpp"
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