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/****************************************************************************
**
** 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_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
}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
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