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, an 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 fill color.
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 XY 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.