Reference:

Background|red|green|blue
Fill|red|green|blue|alpha
Font|size|family|centered?
Stroke|red|green|blue|alpha
Width|width

Arc|x|y|radius|degrees|value
Ellipse|x|y|radiusX|radiusY
Hexagon|x|y|radius
Line|x1|y1|x2|y2
Octagon|x|y|radius
Quadrilateral|x1|y1|x2|y2|x3|y3|x4|y4
Rectangle|x|y|width|height
Star|x|y|radius
Text|text|x|y
Triangle|x1|y1|x2|y2|x3|y3

To escape pipes in text, type "\|".
To escape backslashes in text, type "\\".