Lissajous-curves

    x(t) = sin(pi * (2 * 2t - 0.5))
    y(t) = sin(pi * 1 * 2t)

    f1/f2 = 2/1 	phi = 0.5

    plotted with several adapted cubic bezier-curves
    The plotcurves were calculated by some fancy code. The bezier-curve
    controlpoints are placed on tangents of the function-curve. They are
    furthermore positioned in a way to minimize the average quadratic distance
    between the bezier-curve and the function. This gives an accuracy, so that
    the deviation is in no point greater than 0.00001.

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    rights: GNU Free Documentation license,
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