Distance From Point To Line
using System;
namespace ComputationalGeometry.Shapes
{
public static class MathUtility
{
public static double DistanceFromPointToLine(Point2D point, Line2D line)
{
// given a line based on two points, and a point away from the line,
// find the perpendicular distance from the point to the line.
// see http://mathworld.wolfram.com/Point-LineDistance2-Dimensional.html
// for explanation and defination.
Point2D l1 = line.InitialPoint;
Point2D l2 = line.TerminalPoint;
return Math.Abs((l2.X - l1.X)*(l1.Y - point.Y) - (l1.X - point.X)*(l2.Y - l1.Y))/
Math.Sqrt(Math.Pow(l2.X - l1.X, 2) + Math.Pow(l2.Y - l1.Y, 2));
}
}
}