Canvas uses absolute positioning, so you'd have to recompute the position yourself. It shouldn't be too hard -- you can just multiply every child's position by the appropriate scale for x & y. (E.g. get the list via .graphical-children, and for each child use .get-xy and .set-xy.)

If you don't need the (x, y) positioning of Canvas, you could consider a Grid, or some other Graphic that lays out its children relative to origins and constraints.