void CubicBezierInterpolator::updateControlPoints(BezierPoint& point, BezierPoint* prevPoint, BezierPoint* nextPoint)
{
if (prevPoint)
{
if (nextPoint)
{
auto t = timeAtX(point.pos()->getX(), *prevPoint, *nextPoint);
*prevPoint->cp2() *= t;
*nextPoint->cp1() *= (1.f - t);
}
else
{
auto x = prevPoint->cp2()->getX();
auto maxx = (point.pos()->getX() - prevPoint->pos()->getX());
// Don't allow the previous point's control point go beyond the new point
if (x > 0 && x > maxx)
{
*prevPoint->cp2() *= (maxx / x);
}
else if (x < 0)
{
prevPoint->cp2()->setX(maxx * 0.5f);
prevPoint->cp2()->setY(0.0f);
}
}
}
else if (nextPoint)
{
auto x = nextPoint->cp1()->getX();
auto minx = (point.pos()->getX() - nextPoint->pos()->getX());
// Don't allow the next point's control point to precede the new point
if (x < 0 && x < minx)
{
*nextPoint->cp1() *= (minx / x);
}
else if (x > 0)
{
prevPoint->cp2()->setX(minx * 0.5f);
prevPoint->cp2()->setY(0.0f);
}
}
}
void CubicBezierInterpolator::updateControlPoints(BezierPoint& point, BezierPoint* prevPoint, BezierPoint* nextPoint)
{
if(prevPoint)
{
if(nextPoint)
{
auto t = timeAtX(point.pos->getX(), *prevPoint, *nextPoint);
*prevPoint->cp2.get() *= t;
*nextPoint->cp1.get() *= ( 1.f - t );
}
else
{
prevPoint->cp2->setX(( point.pos->getX() - prevPoint->pos->getX() ) / 2.f);
prevPoint->cp2->setY(0.f);
}
}
else if(nextPoint)
{
nextPoint->cp1->setX(( point.pos->getX() - nextPoint->pos->getX() ) / 2.f);
nextPoint->cp1->setY(0);
}
}
