aboutsummaryrefslogtreecommitdiffstats
path: root/src/declarative/particles/qsgmove.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/declarative/particles/qsgmove.cpp')
-rw-r--r--src/declarative/particles/qsgmove.cpp131
1 files changed, 131 insertions, 0 deletions
diff --git a/src/declarative/particles/qsgmove.cpp b/src/declarative/particles/qsgmove.cpp
new file mode 100644
index 0000000000..e885685d6d
--- /dev/null
+++ b/src/declarative/particles/qsgmove.cpp
@@ -0,0 +1,131 @@
+/****************************************************************************
+**
+** 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 "qsgmove_p.h"
+#include <cmath>
+QT_BEGIN_NAMESPACE
+const qreal CONV = 0.017453292520444443;
+/*!
+ \qmlclass Move QSGMoveAffector
+ \inqmlmodule QtQuick.Particles 2
+ \inherits Affector
+ \brief The Move element allows you to set a new position, speed or acceleration on particles
+
+ You'll often want to set the 'once' property to true for efficiency in the case where you just
+ want to set the parameter. Otherwise, the parameter will be needlessly set to the same thing
+ every simulation cycle.
+*/
+
+/*!
+ \qmlproperty StochasticDirection QtQuick.Particles2::Move::position
+
+ Affected particles will have their position set to this direction,
+ relative to the ParticleSystem. When interpreting directions as points,
+ imagine it as an arrow with the base at the 0,0 of the ParticleSystem and the
+ tip at where the specified position will be.
+*/
+
+/*!
+ \qmlproperty StochasticDirection QtQuick.Particles2::Move::speed
+
+ Affected particles will have their speed set to this direction.
+*/
+
+
+/*!
+ \qmlproperty StochasticDirection QtQuick.Particles2::Move::acceleration
+
+ Affected particles will have their acceleration set to this direction.
+*/
+
+
+/*!
+ \qmlproperty bool QtQuick.Particles2::Move::relative
+
+ Whether the affected particles have their existing position/speed/acceleration added
+ to the new one.
+*/
+
+QSGMoveAffector::QSGMoveAffector(QSGItem *parent)
+ : QSGParticleAffector(parent)
+ , m_position(&m_nullVector)
+ , m_speed(&m_nullVector)
+ , m_acceleration(&m_nullVector)
+ , m_relative(false)
+{
+}
+
+bool QSGMoveAffector::affectParticle(QSGParticleData *d, qreal dt)
+{
+ Q_UNUSED(dt);
+ bool changed = false;
+ QPointF curPos(d->curX(), d->curY());
+
+ if (m_position != &m_nullVector){
+ QPointF pos = m_position->sample(curPos);
+ if (m_relative)
+ pos += curPos;
+ d->setInstantaneousX(pos.x());
+ d->setInstantaneousY(pos.y());
+ changed = true;
+ }
+
+ if (m_speed != &m_nullVector){
+ QPointF pos = m_speed->sample(curPos);
+ if (m_relative)
+ pos += QPointF(d->curVX(), d->curVY());
+ d->setInstantaneousVX(pos.x());
+ d->setInstantaneousVY(pos.y());
+ changed = true;
+ }
+
+ if (m_acceleration != &m_nullVector){
+ QPointF pos = m_acceleration->sample(curPos);
+ if (m_relative)
+ pos += QPointF(d->curAX(), d->curAY());
+ d->setInstantaneousAX(pos.x());
+ d->setInstantaneousAY(pos.y());
+ changed = true;
+ }
+
+ return changed;
+}
+QT_END_NAMESPACE