void Bezier<POINT>::PVec( const float t, POINT &point) const
{
XTRACE();
float t2 = 2*t;
float tt3 = 3*t*t;
if( point.dimension() != 2) return;
//vector perpendicular to tangent at t
// x/y -> -(y/x)
point.set(1, pd[0][1] + t2*pd[0][2] + tt3*pd[0][3]);
point.set(0,-(pd[1][1] + t2*pd[1][2] + tt3*pd[1][3]));
}
void Bezier<POINT>::TVec( const float t, POINT &point) const
{
XTRACE();
float t2 = 2*t;
float tt3 = 3*t*t;
for( int d=0; d<point.dimension(); d++)
{
point.set(d, pd[d][1] + t2*pd[d][2] + tt3*pd[d][3]);
}
}
void Bezier<POINT>::Pos( const float t, POINT &point) const
{
XTRACE();
float tt = t*t;
float ttt = t*tt;
for( int d=0; d<point.dimension(); d++)
{
point.set(d, pd[d][0] + t*pd[d][1] + tt*pd[d][2] + ttt*pd[d][3]);
}
}
