//
// Return the line perpendicular to this segment at the given point.
// The point is ON the segment.
public Segment GetPerpendicularByLength(Point pt, double length)
{
Segment perp = this.GetPerpendicular(pt);
//
// Find the point which is length distance from the given point.
//
// Treat the given perpendicular as a vector; normalize and then multiply.
//
Point vector = Point.MakeVector(perp.Point1, perp.Point2);
vector = Point.Normalize(vector);
vector = Point.ScalarMultiply(vector, length);
// 'Move' the vector to begin at its starting point: pt
// Return the perpendicular of proper length.
return(new Segment(pt, new Point("", pt.X + vector.X, pt.Y + vector.Y)));
}
