[racket] Questions about the Canvas

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Wed Jun 13 20:55:02 EDT 2012

On Jun 13, 2012, at 3:16 PM, Hillary Ryan wrote:

> I have a bunch (two dozen) of little objects that I would like to be able to draw on one canvas. At the moment I am passing each object the drawing context which comes from the canvas, letting the object draw itself and then moving onto the next object. By this method, if one object changes I have to redraw the entire canvas. I know in Java you can redraw only part of the canvas. Is there a standard method in Racket for drawing a bunch of objects on a canvas efficiently?

Yes if I understand your question correctly, but you have to go a little bit deeper in the GUI toolbox. 

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