returns the total ara of this rectangle concode_field_sep double top concode_elem_sep double left concode_elem_sep double bottom concode_elem_sep double right concode_field_sep Rectangle add concode_elem_sep boolean intersects concode_elem_sep boolean intersects concode_elem_sep Rectangle subtract concode_elem_sep Vector centre concode_elem_sep double getWidth concode_elem_sep double segmentQuery concode_elem_sep Rectangle encapsulateVectors concode_elem_sep double getHeight concode_elem_sep boolean contains concode_elem_sep boolean contains concode_elem_sep boolean contains concode_elem_sep Rectangle expand concode_elem_sep Rectangle encapsulateCircle concode_elem_sep Vector getBottomRight concode_elem_sep Rectangle merge concode_elem_sep Rectangle encapsulateTriangle concode_elem_sep Vector getTopLeft concode_elem_sep double clamp concode_elem_sep Vector clamp
double function ( ) { return ( left - right ) * ( top - bottom ) ; }