diff options
author | Alan Alpert <alan.alpert@nokia.com> | 2011-10-25 07:57:54 +1000 |
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committer | Qt by Nokia <qt-info@nokia.com> | 2011-10-25 00:00:42 +0200 |
commit | d6cc95cee7c42803793a70988d85e2d3164b17f7 (patch) | |
tree | b0c137e6d40bc62069e64ffbfef949de6c04423c /src/declarative/particles/qquickgravity.cpp | |
parent | 198ab5fa2400fac490f2d2ebbb97d988fe3f69b8 (diff) |
Rename QSG* to QQuick* in particles folder
Change-Id: I793eaf16f3810df0cb0f9f8482ac0b9d6137595d
Reviewed-by: Alan Alpert <alan.alpert@nokia.com>
Diffstat (limited to 'src/declarative/particles/qquickgravity.cpp')
-rw-r--r-- | src/declarative/particles/qquickgravity.cpp | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/src/declarative/particles/qquickgravity.cpp b/src/declarative/particles/qquickgravity.cpp new file mode 100644 index 0000000000..010fcb8d44 --- /dev/null +++ b/src/declarative/particles/qquickgravity.cpp @@ -0,0 +1,104 @@ +/**************************************************************************** +** +** 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 "qquickgravity_p.h" +#include <cmath> +QT_BEGIN_NAMESPACE +const qreal CONV = 0.017453292520444443; +/*! + \qmlclass Gravity QQuickGravityAffector + \inqmlmodule QtQuick.Particles 2 + \inherits Affector + \brief The Gravity element allows you to set a constant accleration in an angle + + This element will set the acceleration of all affected particles to a vector of + the specified magnitude in the specified angle. If the angle or acceleration is + not varying, it is more efficient to set the specified acceleration on the Emitter. + + This element models the gravity of a massive object whose center of + gravity is far away (and thus the gravitational pull is effectively constant + across the scene). To model the gravity of an object near or inside the scene, + use PointAttractor. +*/ + +/*! + \qmlproperty real QtQuick.Particles2::Gravity::acceleration + + Pixels per second that objects will be accelerated by. +*/ +/*! + \qmlproperty real QtQuick.Particles2::Gravity::angle + + Angle of acceleration. +*/ + +QQuickGravityAffector::QQuickGravityAffector(QQuickItem *parent) : + QQuickParticleAffector(parent), m_acceleration(-10), m_angle(90), m_xAcc(0), m_yAcc(0) +{ + connect(this, SIGNAL(accelerationChanged(qreal)), + this, SLOT(recalc())); + connect(this, SIGNAL(angleChanged(qreal)), + this, SLOT(recalc())); + recalc(); +} + +void QQuickGravityAffector::recalc() +{ + qreal theta = m_angle * CONV; + m_xAcc = m_acceleration * cos(theta); + m_yAcc = m_acceleration * sin(theta); +} + +bool QQuickGravityAffector::affectParticle(QQuickParticleData *d, qreal dt) +{ + Q_UNUSED(dt); + bool changed = false; + if (d->ax != m_xAcc){ + d->setInstantaneousAX(m_xAcc); + changed = true; + } + if (d->ay != m_yAcc){ + d->setInstantaneousAY(m_yAcc); + changed = true; + } + return changed; +} +QT_END_NAMESPACE |