public Coordinate getMiddlePoint ( ) { double x = this . x1 ( ) + 0.5 * ( this . x2 ( ) - this . x1 ( ) ) ; double y = this . y1 ( ) + 0.5 * ( this . y2 ( ) - this . y1 ( ) ) ; return new Coordinate ( x , y ) ; }
Return the middle point of this linesegment .