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Diffstat (limited to 'src/imports/particles/followemitter.cpp')
| -rw-r--r-- | src/imports/particles/followemitter.cpp | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/src/imports/particles/followemitter.cpp b/src/imports/particles/followemitter.cpp new file mode 100644 index 0000000000..9e1ec7bbd2 --- /dev/null +++ b/src/imports/particles/followemitter.cpp @@ -0,0 +1,196 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** 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 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. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "followemitter.h" +#include "particle.h" +#include <cmath> +QT_BEGIN_NAMESPACE + +FollowEmitter::FollowEmitter(QSGItem *parent) : + ParticleEmitter(parent) + , m_particlesPerParticlePerSecond(0) + , m_lastTimeStamp(0) + , m_emitterXVariation(0) + , m_emitterYVariation(0) + , m_followCount(0) + , m_emissionExtruder(0) + , m_defaultEmissionExtruder(new ParticleExtruder(this)) +{ + connect(this, SIGNAL(followChanged(QString)), + this, SLOT(recalcParticlesPerSecond())); + connect(this, SIGNAL(particleDurationChanged(int)), + this, SLOT(recalcParticlesPerSecond())); + connect(this, SIGNAL(particlesPerParticlePerSecondChanged(int)), + this, SLOT(recalcParticlesPerSecond())); +} + +void FollowEmitter::recalcParticlesPerSecond(){ + if(!m_system) + return; + m_followCount = m_system->m_groupData[m_system->m_groupIds[m_follow]]->size; + if(!m_followCount){ + setParticlesPerSecond(1000);//XXX: Fix this horrendous hack, needed so they aren't turned off from start (causes crashes - test that when gone you don't crash with 0 PPPS) + }else{ + setParticlesPerSecond(m_particlesPerParticlePerSecond * m_followCount); + m_lastEmission.resize(m_followCount); + m_lastEmission.fill(0); + } +} + +void FollowEmitter::reset() +{ + m_followCount = 0; +} + +void FollowEmitter::emitWindow(int timeStamp) +{ + if (m_system == 0) + return; + if(!m_emitting && !m_burstLeft && !m_emitLeft) + return; + if(m_followCount != m_system->m_groupData[m_system->m_groupIds[m_follow]]->size){ + qreal oldPPS = m_particlesPerSecond; + recalcParticlesPerSecond(); + if(m_particlesPerSecond != oldPPS) + return;//system may need to update + } + + if(m_burstLeft){ + m_burstLeft -= timeStamp - m_lastTimeStamp * 1000.; + if(m_burstLeft < 0){ + timeStamp += m_burstLeft; + m_burstLeft = 0; + } + } + + qreal time = timeStamp / 1000.; + qreal particleRatio = 1. / m_particlesPerParticlePerSecond; + qreal pt; + + //Have to map it into this system, because particlesystem automaps it back + QPointF offset = m_system->mapFromItem(this, QPointF(0, 0)); + qreal sizeAtEnd = m_particleEndSize >= 0 ? m_particleEndSize : m_particleSize; + + int gId = m_system->m_groupIds[m_follow]; + int gId2 = m_system->m_groupIds[m_particle]; + for(int i=0; i<m_system->m_groupData[gId]->size; i++){ + pt = m_lastEmission[i]; + ParticleData* d = m_system->m_data[i + m_system->m_groupData[gId]->start]; + if(!d || !d->stillAlive()) + continue; + if(pt < d->pv.t) + pt = d->pv.t; + + if(!effectiveExtruder()->contains(QRectF(offset.x(), offset.y(), width(), height()),QPointF(d->curX(), d->curY()))){ + m_lastEmission[i] = time;//jump over this time period without emitting, because it's outside + continue; + } + while(pt < time || m_emitLeft){ + ParticleData* datum = m_system->newDatum(gId2); + if(!datum){//skip this emission + if(m_emitLeft) + --m_emitLeft; + else + pt += particleRatio; + continue; + } + datum->e = this;//###useful? + ParticleVertex &p = datum->pv; + + // Particle timestamp + p.t = pt; + p.lifeSpan = + (m_particleDuration + + ((rand() % ((m_particleDurationVariation*2) + 1)) - m_particleDurationVariation)) + / 1000.0; + + // Particle position + qreal followT = pt - d->pv.t; + qreal followT2 = followT * followT * 0.5; + qreal sizeOffset = d->pv.size/2;//TODO: Current size? As an option + //TODO: Set variations + //Subtract offset, because PS expects this in emitter coordinates + QRectF boundsRect(d->pv.x - offset.x() + d->pv.sx * followT + d->pv.ax * followT2 - m_emitterXVariation/2, + d->pv.y - offset.y() + d->pv.sy * followT + d->pv.ay * followT2 - m_emitterYVariation/2, + m_emitterXVariation, + m_emitterYVariation); +// QRectF boundsRect(d->pv.x + d->pv.sx * followT + d->pv.ax * followT2 + offset.x() - sizeOffset, +// d->pv.y + d->pv.sy * followT + d->pv.ay * followT2 + offset.y() - sizeOffset, +// sizeOffset*2, +// sizeOffset*2); + + ParticleExtruder* effectiveEmissionExtruder = m_emissionExtruder ? m_emissionExtruder : m_defaultEmissionExtruder; + const QPointF &newPos = effectiveEmissionExtruder->extrude(boundsRect); + p.x = newPos.x(); + p.y = newPos.y(); + + // Particle speed + const QPointF &speed = m_speed->sample(newPos); + p.sx = speed.x(); + p.sy = speed.y(); + + // Particle acceleration + const QPointF &accel = m_acceleration->sample(newPos); + p.ax = accel.x(); + p.ay = accel.y(); + + // Particle size + float sizeVariation = -m_particleSizeVariation + + rand() / float(RAND_MAX) * m_particleSizeVariation * 2; + + float size = qMax((qreal)0.0, m_particleSize + sizeVariation); + float endSize = qMax((qreal)0.0, sizeAtEnd + sizeVariation); + + p.size = size * float(m_emitting); + p.endSize = endSize * float(m_emitting); + + if(m_emitLeft) + --m_emitLeft; + else + pt += particleRatio; + m_system->emitParticle(datum); + } + m_lastEmission[i] = pt; + } + + m_lastTimeStamp = time; +} +QT_END_NAMESPACE |