public void setConer(int index, Vector3D v) {
        if (index <= 0) {
            this.x1 = v.getX();
            this.y1 = v.getY();
        } else if (index == 1) {
            this.x2 = v.getX();
            this.y2 = v.getY();
        } else if (index == 2) {
            this.x3 = v.getX();
            this.y3 = v.getY();
        } else if (3 <= index) {
            this.x4 = v.getX();
            this.y4 = v.getY();
        }
        calcG();
    }
public void setConer ( int index , Vector3D v ) { if ( index <= 0 ) { this . x1 = v . getX ( ) ; this . y1 = v . getY ( ) ; } else if ( index == 1 ) { this . x2 = v . getX ( ) ; this . y2 = v . getY ( ) ; } else if ( index == 2 ) { this . x3 = v . getX ( ) ; this . y3 = v . getY ( ) ; } else if ( 3 <= index ) { this . x4 = v . getX ( ) ; this . y4 = v . getY ( ) ; } calcG ( ) ; }
Sets coordinates of a corner.

@param index The index of a corner.
@param v The coordinates of a corner.