Rect
From King Arthur's Gold Wiki
The recti type is used to create GUI elements among other things. There are two variances.
Method one uses a position2di and dimension2di argument. The dimension2di argument represents the width and the height;
recti rect (position2di(pos.x, pos.y), dimension2di(50, 70));
Method two uses two position2di arguments. The first being the upper left hand corner and the second being the lower right hand corner. ( needs clarification. )
recti rect (position2di(pos.x, pos.y), position2di(pos.x + 50, pos.y + 70));