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#include "gravityaffector.h"
#include <cmath>
QT_BEGIN_NAMESPACE
const qreal CONV = 0.017453292520444443;
GravityAffector::GravityAffector(QSGItem *parent) :
ParticleAffector(parent), m_acceleration(-10), m_angle(90), m_xAcc(0), m_yAcc(0)
{
connect(this, SIGNAL(accelerationChanged(qreal)),
this, SLOT(recalc()));
connect(this, SIGNAL(angleChanged(qreal)),
this, SLOT(recalc()));
recalc();
}
void GravityAffector::recalc()
{
qreal theta = m_angle * CONV;
m_xAcc = m_acceleration * cos(theta);
m_yAcc = m_acceleration * sin(theta);
}
bool GravityAffector::affectParticle(ParticleData *d, qreal dt)
{
Q_UNUSED(dt);
bool changed = false;
if(d->pv.ax != m_xAcc){
d->setInstantaneousAX(m_xAcc);
changed = true;
}
if(d->pv.ay != m_yAcc){
d->setInstantaneousAY(m_yAcc);
changed = true;
}
return changed;
}
QT_END_NAMESPACE
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