list of classes

RSCamera

All shapes in Roassal are contained in a RSCanvas. The canvas has an infinite 2D dimension. The portion of the canvas that is visible within the window is given by a camera. RSCamera describes a camera in Roassal. A camera has a scale and a position.

Responsibility: identify the portion and the zoom level of a canvas that must be visible. Whenever the canvas is scrolled with the mouse or the key, then the camera is responsible for this.

Collaborators: A RSCanvas has a RSCamera.

Variables: position is a point representing coordinates of the canvas on which the viewing window frame will be centered. Position can be changes with the method #translateBy: and #translateTo:. Both methods accept canvas based coordinates

scale defines a magnitude of zooming applied to the canvas and its elements.

Example:

c := RSCanvas new.
1 to: 100 do: [ :i |
	| g |
	g := RSGroup new.
	g add: (RSEllipse new size: 30; color: Color gray lighter).
	g add: (RSLabel new text: i).
	c add: g asShape ].
RSGridLayout on: c shapes.
camera := c canvas camera.
camera translateBy: 500 @ 50.
camera scale: 0.5.
c