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#include "directedvector.h"
#include <cmath>
QT_BEGIN_NAMESPACE
DirectedVector::DirectedVector(QObject *parent) :
VaryingVector(parent)
, m_targetX(0)
, m_targetY(0)
, m_targetVariation(0)
, m_proportionalMagnitude(false)
, m_magnitude(0)
, m_magnitudeVariation(0)
{
}
const QPointF &DirectedVector::sample(const QPointF &from)
{
//###This approach loses interpolating the last position of the target (like we could with the emitter) is it worthwhile?
qreal targetX = m_targetX - from.x() - m_targetVariation + rand()/(float)RAND_MAX * m_targetVariation*2;
qreal targetY = m_targetY - from.y() - m_targetVariation + rand()/(float)RAND_MAX * m_targetVariation*2;
qreal theta = atan2(targetY, targetX);
qreal mag = m_magnitude + rand()/(float)RAND_MAX * m_magnitudeVariation * 2 - m_magnitudeVariation;
if(m_proportionalMagnitude)
mag *= sqrt(targetX * targetX + targetY * targetY);
m_ret.setX(mag * cos(theta));
m_ret.setY(mag * sin(theta));
return m_ret;
}
QT_END_NAMESPACE
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