question: public static Point2D findDistancedPoint ( double t , Point2D sp , Point2D c1 , Point2D c2 , Point2D ep ) { double d = 1 - t ; double dCube = d * d * d ; double dSqr = d * d ; double tCube = t * t * t ; double tSqr = t * t ; double xCoord = ( dCube * sp . getX ( ) ) + ( 3 * t * dSqr * c1 . getX ( ) ) + ( 3 * tSqr * d * c2 . getX ( ) ) + ( tCube * ep . getX ( ) ) ; double yCoord = ( dCube * sp . getY ( ) ) + ( 3 * t * dSqr * c1 . getY ( ) ) + ( 3 * tSqr * d * c2 . getY ( ) ) + ( tCube * ep . getY ( ) ) ; return new Point2D . Double ( xCoord , yCoord ) ; }
target:  method used to find any point in given distance in cubic bezier curve