The location and size of a rectangle region. The width and height of a graphene:rect-t instance can be negative. For instance, a graphene:rect-t instance with an origin of [ 0, 0 ] and a size of [ 10, 10 ] is equivalent to a graphene:rect-t instance with an origin of [ 10, 10 ] and a size of [ -10, -10 ].

Application code can normalize rectangles using the graphene:rect-normalize function. This function will ensure that the width and height of a rectangle are positive values. All functions taking a graphene:rect-t instance as an argument will internally operate on a normalized copy. All functions returning a graphene:rect-t instance will always return a normalized rectangle.

(cffi:defcstruct rect-t
  (origin (:struct point-t))
  (size (:struct size-t)))  

origin

A graphene:point-t instance with the coordinates of the origin of the rectangle.

size

A graphene:size-t instance with the size of the rectangle.