Canvases Canvases are form drawing areas. Understanding canvases This is an introduction to CANVAS drawing. CANVAS item definition The CANVAS form item defines an area in which you can draw shapes, in a grid-based layout. Syntax of canvas nodes The AUI tree contains the XML representation of the canvas, with a variety of elements defining shapes. Canvas drawing area The canvas area defines a two-dimensional coordinate system to draw elements. Canvas drawing functions Examples Canvas usage examples.