closest_point

Description:

public double closest_point (double x, double y, out double on_path_x, out double on_path_y, out int node_pos_before)

Figure out what and where on a path is closest to arbitrary coordinates.

Returns the length along the path where the closest point was encountered.

this	a Path
x	x coordinate.
y	y coordinate
on_path_x	return location for x coordinate on the path that was closest
on_path_y	return location for y coordinate on the path that was closest
node_pos_before	the node position interpreted before this position was deemed the closest coordinate.