Syntax of canvas nodes

The AUI tree contains the XML representation of the canvas, with a variety of elements defining shapes.

Canvas areas are defined in forms with the following XML syntax:

<Canvas colName="name" >
{ <CanvasArc canvasitem-attribute="value" [...] />
| <CanvasCircle canvasitem-attribute="value"[...] />
| <CanvasLine canvasitem-attribute="value"[...] />
| <CanvasOval canvasitem-attribute="value"[...] />
| <CanvasPolygon canvasitem-attribute="value"[...] />
| <CanvasRectangle canvasitem-attribute="value"[...] />
| <CanvasText canvasitem-attribute="value"[...] />
} [...]
</Canvas>
[...]

Table 1. Types of canvas element
Name	Description
`CanvasArc`	Arc defined by the bounding square top left point, a diameter, a start angle, a end angle, and a fill color.
`CanvasCircle`	Circle defined by the bounding square top left point, a diameter, and a fill color.
`CanvasLine`	Line defined by a start point, an end point, width, and a fill color.
`CanvasOval`	Oval defined by rectangle (with start point and endpoint), and a fill color.
`CanvasPolygon`	Polygon defined by a list of points, and a fillcolor.
`CanvasRectangle`	Rectangle defined by a start point, an end point,and a fill color.
`CanvasText`	Text defined by a start point, an anchor hint, the text, and a fill color.

Table 2. Attributes of canvas elements
Name	Values	Description
`startX`	`INTEGER (0->1000)`	X position of starting point.
`startY`	`INTEGER (0->1000)`	Y position of starting point.
`endX`	`INTEGER (0->1000)`	X position of ending point.
`endY`	`INTEGER (0->1000)`	Y position of ending point.
`xyList`	`STRING`	Space-separated list of Y X coordinates. For example: "23 45 56 78" defines (x=23,y=45) (x=56,y=78).
`width`	`INTEGER`	Width of the shape.
`height`	`INTEGER`	Height of the shape.
`diameter`	`INTEGER`	Diameter for circles and arcs.
`startDegrees`	`INTEGER`	Beginning of the angular range occupied by an arc.
`extentDegrees`	`INTEGER`	Size of the angular range occupied by an arc.
`text`	`STRING`	The text to draw.
`anchor`	`"n","e","w","s"`	Anchor hint to give the draw direction for texts.
`fillColor`	`STRING`	Name of the color to be used for the element.
`acceleratorKey1`	`STRING`	Name of the key associated to a left button click.
`acceleratorKey3`	`STRING`	Name of the key associated to a right button click.