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Diffstat (limited to 'src/quick/particles/qquickwander.cpp')
| -rw-r--r-- | src/quick/particles/qquickwander.cpp | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/quick/particles/qquickwander.cpp b/src/quick/particles/qquickwander.cpp new file mode 100644 index 0000000000..dfbff36076 --- /dev/null +++ b/src/quick/particles/qquickwander.cpp @@ -0,0 +1,180 @@ +/**************************************************************************** +** +** 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 "qquickwander_p.h" +#include "qquickparticlesystem_p.h"//for ParticlesVertices +QT_BEGIN_NAMESPACE +/*! + \qmlclass Wander QQuickWanderAffector + \inqmlmodule QtQuick.Particles 2 + \inherits Affector + \brief The Wander affector allows particles to randomly vary their trajectory. + +*/ +/*! + \qmlproperty real QtQuick.Particles2::Wander::pace + + Maximum attribute change per second. +*/ +/*! + \qmlproperty real QtQuick.Particles2::Wander::xVariance + + Maximum attribute x value (as a result of Wander). + + If unset, Wander will not affect x values. +*/ +/*! + \qmlproperty real QtQuick.Particles2::Wander::yVariance + + Maximum attribute y value (as a result of Wander). + + If unset, Wander will not affect y values. +*/ +/*! + \qmlproperty AffectableParameter QtQuick.Particles2::Wander::affectedParameter + + What attribute of particles is directly affected. + \list + \o PointAttractor.Position + \o PointAttractor.Velocity + \o PointAttractor.Acceleration + \endlist +*/ + +QQuickWanderAffector::QQuickWanderAffector(QQuickItem *parent) : + QQuickParticleAffector(parent), m_xVariance(0), m_yVariance(0), m_pace(0) + , m_affectedParameter(Velocity) +{ + m_needsReset = true; +} + +QQuickWanderAffector::~QQuickWanderAffector() +{ + for (QHash<int, WanderData*>::const_iterator iter=m_wanderData.constBegin(); + iter != m_wanderData.constEnd(); iter++) + delete (*iter); +} + +WanderData* QQuickWanderAffector::getData(int idx) +{ + if (m_wanderData.contains(idx)) + return m_wanderData[idx]; + WanderData* d = new WanderData; + d->x_vel = 0; + d->y_vel = 0; + d->x_peak = m_xVariance; + d->y_peak = m_yVariance; + d->x_var = m_pace * qreal(qrand()) / RAND_MAX; + d->y_var = m_pace * qreal(qrand()) / RAND_MAX; + + m_wanderData.insert(idx, d); + return d; +} + +void QQuickWanderAffector::reset(int systemIdx) +{ + if (m_wanderData.contains(systemIdx)) + delete m_wanderData[systemIdx]; + m_wanderData.remove(systemIdx); +} + +bool QQuickWanderAffector::affectParticle(QQuickParticleData* data, qreal dt) +{ + /*TODO: Add a mode which does basically this - picking a direction, going in it (random speed) and then going back + WanderData* d = getData(data->systemIndex); + if (m_xVariance != 0.) { + if ((d->x_vel > d->x_peak && d->x_var > 0.0) || (d->x_vel < -d->x_peak && d->x_var < 0.0)) { + d->x_var = -d->x_var; + d->x_peak = m_xVariance + m_xVariance * qreal(qrand()) / RAND_MAX; + } + d->x_vel += d->x_var * dt; + } + qreal dx = dt * d->x_vel; + + if (m_yVariance != 0.) { + if ((d->y_vel > d->y_peak && d->y_var > 0.0) || (d->y_vel < -d->y_peak && d->y_var < 0.0)) { + d->y_var = -d->y_var; + d->y_peak = m_yVariance + m_yVariance * qreal(qrand()) / RAND_MAX; + } + d->y_vel += d->y_var * dt; + } + qreal dy = dt * d->x_vel; + + //### Should we be amending vel instead? + ParticleVertex* p = &(data->pv); + p->x += dx; + + p->y += dy; + return true; + */ + qreal dx = dt * m_pace * (2 * qreal(qrand())/RAND_MAX - 1); + qreal dy = dt * m_pace * (2 * qreal(qrand())/RAND_MAX - 1); + qreal newX, newY; + switch (m_affectedParameter){ + case Position: + newX = data->curX() + dx; + if (m_xVariance > qAbs(newX) ) + data->x += dx; + newY = data->curY() + dy; + if (m_yVariance > qAbs(newY) ) + data->y += dy; + break; + default: + case Velocity: + newX = data->curVX() + dx; + if (m_xVariance > qAbs(newX) ) + data->setInstantaneousVX(newX); + newY = data->curVY() + dy; + if (m_yVariance > qAbs(newY) ) + data->setInstantaneousVY(newY); + break; + case Acceleration: + newX = data->ax + dx; + if (m_xVariance > qAbs(newX) ) + data->setInstantaneousAX(newX); + newY = data->ay + dy; + if (m_yVariance > qAbs(newY) ) + data->setInstantaneousAY(newY); + break; + } + return true; +} +QT_END_NAMESPACE |