Key points are not available for this paper at this time.
Our goal is to embed free-form constraints into a graphical model. With such constraints a graphic can maintain its visual integrity-and break rules tastefully-while being manipulated by a casual user. A typical parameterized graphic does not meet these needs because its configuration space contains nonsense images in much higher proportion than desirable images, and the casual user is apt to ruin the graphic on any attempt to modify or animate it.
Ngo et al. (Sat,) studied this question.