question: negate this vector without creating a new copy concode_field_sep float x concode_elem_sep float y concode_elem_sep long serialVersionUID concode_field_sep Vector2f add concode_elem_sep Vector2f add concode_elem_sep Vector2f getNormal concode_elem_sep Vector2f sub concode_elem_sep Vector2f sub concode_elem_sep void setTheta concode_elem_sep void set concode_elem_sep Vector2f set concode_elem_sep Vector2f set concode_elem_sep float lengthSquared concode_elem_sep float distance concode_elem_sep float dot concode_elem_sep float length concode_elem_sep Vector2f scale concode_elem_sep Vector2f normalise concode_elem_sep float distanceSquared concode_elem_sep float getX concode_elem_sep void projectOntoUnit concode_elem_sep float getY concode_elem_sep Vector2f negate concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep double getTheta concode_elem_sep String toString concode_elem_sep Vector2f copy concode_elem_sep Vector2f getPerpendicular
target: Vector2f function ( ) { x = - x ; y = - y ; return this ; }