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#include "wanderaffector.h"
#include "particlesystem.h"//for ParticlesVertices
QT_BEGIN_NAMESPACE
WanderAffector::WanderAffector(QSGItem *parent) :
ParticleAffector(parent)
{
m_needsReset = true;
}
WanderAffector::~WanderAffector()
{
for(QHash<int, WanderData*>::const_iterator iter=m_wanderData.constBegin();
iter != m_wanderData.constEnd(); iter++)
delete (*iter);
}
WanderData* WanderAffector::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 WanderAffector::reset(int systemIdx)
{
if(m_wanderData.contains(systemIdx))
delete m_wanderData[systemIdx];
m_wanderData.remove(systemIdx);
}
bool WanderAffector::affectParticle(ParticleData* data, qreal dt)
{
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;
}
QT_END_NAMESPACE
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