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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickangledirection_p.h"
#include <stdlib.h>
#include <qmath.h>
QT_BEGIN_NAMESPACE
const qreal CONV = 0.017453292519943295;
/*!
\qmltype AngleDirection
\instantiates QQuickAngleDirection
\inqmlmodule QtQuick.Particles
\ingroup qtquick-particles
\inherits Direction
\brief For specifying a direction that varies in angle
The AngledDirection element allows both the specification of a direction by angle and magnitude,
as well as varying the parameters by angle or magnitude.
*/
/*!
\qmlproperty real QtQuick.Particles::AngleDirection::angle
This property specifies the base angle for the direction.
The angle of this direction will vary by no more than angleVariation
from this angle.
Angle is specified by degrees clockwise from straight right.
The default value is zero.
*/
/*!
\qmlproperty real QtQuick.Particles::AngleDirection::magnitude
This property specifies the base magnitude for the direction.
The magnitude of this direction will vary by no more than magnitudeVariation
from this magnitude.
Magnitude is specified in units of pixels per second.
The default value is zero.
*/
/*!
\qmlproperty real QtQuick.Particles::AngleDirection::angleVariation
This property specifies the maximum angle variation for the direction.
The angle of the direction will vary by up to angleVariation clockwise
and anticlockwise from the value specified in angle.
Angle is specified by degrees clockwise from straight right.
The default value is zero.
*/
/*!
\qmlproperty real QtQuick.Particles::AngleDirection::magnitudeVariation
This property specifies the base magnitude for the direction.
The magnitude of this direction will vary by no more than magnitudeVariation
from the base magnitude.
Magnitude is specified in units of pixels per second.
The default value is zero.
*/
QQuickAngleDirection::QQuickAngleDirection(QObject *parent) :
QQuickDirection(parent)
, m_angle(0)
, m_magnitude(0)
, m_angleVariation(0)
, m_magnitudeVariation(0)
{
}
const QPointF QQuickAngleDirection::sample(const QPointF &from)
{
Q_UNUSED(from);
QPointF ret;
qreal theta = m_angle*CONV - m_angleVariation*CONV + rand()/float(RAND_MAX) * m_angleVariation*CONV * 2;
qreal mag = m_magnitude- m_magnitudeVariation + rand()/float(RAND_MAX) * m_magnitudeVariation * 2;
ret.setX(mag * qCos(theta));
ret.setY(mag * qSin(theta));
return ret;
}
QT_END_NAMESPACE
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