// the right-side distance from point pt to the line which passes through linePt
// and has unit direction vector unitDir.
// ie, if the point is on the right of the line, this will be positive.
// if the point is on the left of the line, this will be negative.
// if the point is on the line, this will be zero.
//
// the following code is an optimization of:
// * rotate the unit direction vector 90 degrees CW
// * dot the vector from the line point to the point in question onto the rotated unit vector.
// oxeVec2f is just a struct with float x and float y.
static inline float oxeVec2f_distanceRight_PointLine(
oxeVec2f* linePt,
oxeVec2f* unitDir,
oxeVec2f* pt)
{
   float vx = pt->x - linePt->x;
   float vy = pt->y - linePt->y;
   return unitDir->y * vx - unitDir->x * vy;
}