list of classes

RSCanvas

Roassal keeps its shapes (i.e., instance of a subclass of RSShape) into a canvas. The class RSCanvas implements the Roassal canvas.

Responsibility: keep the (i) structure of the Roassal shapes (both fixed and non-fixed) and (ii) the animations. RSCanvas hides the creation of the RSAthensMorph.

Collaborators: This class is the entry point of Roassal. As soon as one wishes to use Roassal, she has to go through a canvas.

Variables: shapes keeps a collection of shapes (i.e., instance of a subclass of RSShape) as an instance of RSGroup. Shapes contained in shapes are considered as non-fixed, which means that they are subject to the camera.

fixedShapes is an instance of RSGroup that contains "fixed" shapes. A fixed shape is a shape that is not subject to the state of the camera. A fixed shape remains at the same position, independently if the canvas is scrolled.

color is an instance of the Pharo class Color and is used to paint the background.

morph refers to an instance of the class RSAthensMorph, which is the object that intersects Roassal and Morphic.

camera refers to the camera of the canvas.

clearBackground is a boolean indicating whether the background must be cleared at each refresh. This is useful sometime to obtain some interesting visual effects.

Example:

c := RSCanvas new.
c add: (RSLabel new text: 'Hello from Roassal').
c