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Diffstat (limited to 'src/declarative/particles/qsgangledirection.cpp')
| -rw-r--r-- | src/declarative/particles/qsgangledirection.cpp | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/src/declarative/particles/qsgangledirection.cpp b/src/declarative/particles/qsgangledirection.cpp new file mode 100644 index 0000000000..10a31bf07e --- /dev/null +++ b/src/declarative/particles/qsgangledirection.cpp @@ -0,0 +1,115 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the Declarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qsgangledirection_p.h" +#include <cmath> +QT_BEGIN_NAMESPACE +const qreal CONV = 0.017453292519943295; +/*! + \qmlclass AngleDirection QSGAngleDirection + \inqmlmodule QtQuick.Particles 2 + \inherits Direction + \brief The AngleDirection element allows you to specify 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.Particles2::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.Particles2::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.Particles2::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.Particles2::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. +*/ +QSGAngleDirection::QSGAngleDirection(QObject *parent) : + QSGDirection(parent) + , m_angle(0) + , m_magnitude(0) + , m_angleVariation(0) + , m_magnitudeVariation(0) +{ + +} + +const QPointF &QSGAngleDirection::sample(const QPointF &from) +{ + //TODO: Faster + 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; + m_ret.setX(mag * cos(theta)); + m_ret.setY(mag * sin(theta)); + return m_ret; +} + +QT_END_NAMESPACE |