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qquickpathinterpolator.cpp
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/****************************************************************************
**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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** This file is part of the QtQml module of the Qt Toolkit.
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**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 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 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
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** $QT_END_LICENSE$
**
****************************************************************************/
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#include "qquickpathinterpolator_p.h"
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#include "qquickpath_p.h"
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QT_BEGIN_NAMESPACE
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/*!
\qmlclass PathInterpolator QQuickPathInterpolator
\inqmlmodule QtQuick 2
\brief The PathInterpolator element provides a way 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.
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\snippet doc/src/snippets/qml/pathinterpolator.qml 0
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QQuickPathInterpolator::QQuickPathInterpolator(QObject *parent) :
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QObject(parent), _path(0), _x(0), _y(0), _angle(0), _progress(0)
{
}
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/*!
\qmlproperty Path QtQuick2::PathInterpolator::path
This property holds the path to interpolate.
For more information on defining a path see the \l Path documentation.
*/
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QQuickPath *QQuickPathInterpolator::path() const
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{
return _path;
}
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void QQuickPathInterpolator::setPath(QQuickPath *path)
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{
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();
}
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/*!
\qmlproperty real QtQuick2::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.
*/
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qreal QQuickPathInterpolator::progress() const
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{
return _progress;
}
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void QQuickPathInterpolator::setProgress(qreal progress)
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progress = qMin(qMax(progress, (qreal)0.0), (qreal)1.0);
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if (progress == _progress)
return;
_progress = progress;
emit progressChanged();
_q_pathUpdated();
}
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/*!
\qmlproperty real QtQuick2::PathInterpolator::x
\qmlproperty real QtQuick2::PathInterpolator::y
These properties hold the position of the path at \l progress.
*/
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qreal QQuickPathInterpolator::x() const
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{
return _x;
}
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qreal QQuickPathInterpolator::y() const
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{
return _y;
}
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/*!
\qmlproperty real QtQuick2::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.
*/
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qreal QQuickPathInterpolator::angle() const
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{
return _angle;
}
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void QQuickPathInterpolator::_q_pathUpdated()
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{
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();
}
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//convert to clockwise
angle = qreal(360) - angle;
if (qFuzzyCompare(angle, qreal(360)))
angle = qreal(0);
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if (angle != _angle) {
_angle = angle;
emit angleChanged();
}
}
QT_END_NAMESPACE