#=
- point http://jsxgraph.org/docs/symbols/Point.html
- line http://jsxgraph.org/docs/symbols/Line.html
- circle http://jsxgraph.org/docs/symbols/Circle.html
- ellipse http://jsxgraph.org/docs/symbols/Ellipse.html
- arrow http://jsxgraph.org/docs/symbols/Arrow.html
=#
