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#include "followemitter.h"
#include "particle.h"
#include <cmath>
QT_BEGIN_NAMESPACE
FollowEmitter::FollowEmitter(QSGItem *parent) :
ParticleEmitter(parent)
, m_particleSize(16)
, m_particleEndSize(-1)
, m_particleSizeVariation(0)
, m_xSpeed(0)
, m_ySpeed(0)
, m_xSpeedVariation(0)
, m_ySpeedVariation(0)
, m_xAccel(0)
, m_yAccel(0)
, m_xAccelVariation(0)
, m_yAccelVariation(0)
, m_lastTimeStamp(0)
{
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);
}
}
void FollowEmitter::emitWindow(int timeStamp)
{
if (m_system == 0)
return;
if(!m_emitting && !m_burstLeft)
return;
if(m_followCount != m_system->m_groupData[m_system->m_groupIds[m_follow]]->size){
recalcParticlesPerSecond();
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 = this->mapFromItem(m_system, QPointF(0, 0));
float 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)
continue;
if(pt < d->pv.t)
pt = d->pv.t;
if(!QRect(offset.x(), offset.y(), width(), height()).contains(d->curX(), d->curY())){
m_lastEmission[i] = time;//jump over this time period without emitting, because it's outside
continue;
}
while(pt < time){
ParticleData* datum = m_system->newDatum(gId2);
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
//TODO: Set variations
// QRectF boundsRect(d->pv.x + d->pv.sx * followT + d->pv.ax * followT2 + offset.x() - m_emitterXVariation/2,
// d->pv.y + d->pv.sy * followT + d->pv.ay * followT2 + offset.y() - 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);
const QPointF &newPos = effectiveExtruder()->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 = m_particleSize + sizeVariation;
float endSize = sizeAtEnd + sizeVariation;
p.size = size * float(m_emitting);
p.endSize = endSize * float(m_emitting);
pt += particleRatio;
m_system->emitParticle(datum);
}
m_lastEmission[i] = pt;
}
m_lastTimeStamp = time;
}
QT_END_NAMESPACE
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