///<summary>
///The proportion that, when lerped across the given line, results in the given point.
///If the point is not on the line segment, the result is the closest point on the extended line.
///</summary>
public static double LerpProjectOnto(this Vector2d point, Line line)
{
return line.NearestT(point, false);
/*var b = point - line[0];
var d = line.Delta;
return (b * d) / (d * d);*/
}
