void ParticleEmitter::update(float elapsedTime, const ParticleSystemPtr& system)
{
m_elapsedTime += elapsedTime;
// check if finished
if(m_duration > 0 && m_elapsedTime >= m_duration + m_delay) {
m_finished = true;
return;
}
if(!m_active && m_elapsedTime > m_delay)
m_active = true;
if(!m_active)
return;
int nextBurst = std::floor((m_elapsedTime - m_delay) * m_burstRate) + 1;
const ParticleType *type = m_particleType.get();
for(int b = m_currentBurst; b < nextBurst; ++b) {
// every burst created at same position.
float pRadius = stdext::random_range(type->pMinPositionRadius, type->pMaxPositionRadius);
float pAngle = stdext::random_range(type->pMinPositionAngle, type->pMaxPositionAngle);
Point pPosition = m_position + Point(pRadius * std::cos(pAngle), pRadius * std::sin(pAngle));
for(int p = 0; p < m_burstCount; ++p) {
float pDuration = stdext::random_range(type->pMinDuration, type->pMaxDuration);
// particles initial velocity
float pVelocityAbs = stdext::random_range(type->pMinVelocity, type->pMaxVelocity);
float pVelocityAngle = stdext::random_range(type->pMinVelocityAngle, type->pMaxVelocityAngle);
PointF pVelocity(pVelocityAbs * std::cos(pVelocityAngle), pVelocityAbs * std::sin(pVelocityAngle));
// particles initial acceleration
float pAccelerationAbs = stdext::random_range(type->pMinAcceleration, type->pMaxAcceleration);
float pAccelerationAngle = stdext::random_range(type->pMinAccelerationAngle, type->pMaxAccelerationAngle);
PointF pAcceleration(pAccelerationAbs * std::cos(pAccelerationAngle), pAccelerationAbs * std::sin(pAccelerationAngle));
ParticlePtr particle(new Particle(pPosition, type->pStartSize, type->pFinalSize,
pVelocity, pAcceleration,
pDuration, type->pIgnorePhysicsAfter,
type->pColors, type->pColorsStops,
type->pCompositionMode, type->pTexture));
system->addParticle(particle);
}
}
m_currentBurst = nextBurst;
}
