The first vertex of the quadrilateral. If initialized from a rectangle, corresponds to the rectangle's bottom left corner.
The second vertex of the quadrilateral. If initialized from a rectangle, corresponds to the rectangle's top left corner.
The third vertex of the quadrilateral. If initialized from a rectangle, corresponds to the rectangle's top right corner.
The fourth vertex of the quadrilateral. If initialized from a rectangle, corresponds to the rectangle's bottom right corner.
Represents a quadrilateral.