Visual Representation

For objects that are visible on the screen, the following rules apply :

• Objects are drawn downwards and to the right of their position on the screen. This point can be changed during the life cycle of an object, thus making it possible to move objects.
• Objects are drawn without scaling. Objects that do not fit within their bounding box are clipped.
• Objects are drawn with "natural" priority, i.e., on top of already existing objects. However, it is possible to move objects to the top or the bottom of the screen, as well as putting them before or after another object.
• The screen can be frozen, allowing the application to perform many (possibly slow) changes and not update the screen until it's unfrozen.