// Calculate whether or not the arrowheads are too crowded to put inside
// the extension lines. 9.0 is the length of the arrowhead.
// double t = Vector::Parameter(position, endpoint, endpoint - (unit * 9.0 * size));
// Calculate whether or not the arrowheads are too crowded to put inside
// the extension lines. 9.0 is the length of the arrowhead.
// double t = Vector::Parameter(position, endpoint, endpoint - (unit * 9.0 * size));