A Drawing is essentially a scene-graph consisting of all the Views added to it using add method, it also registers event listeners on canvasElement
The Canvas object
A function that will be called per frame
Adds a View to this drawing
A View to be added to the scene-graph
Removes a View from this drawing
A View or its id
A Drawing is essentially a scene-graph consisting of all the Views added to it using add method, it also registers event listeners on canvasElement