TAU is a mathematical constant with the value 6.2831855. It is the circle constant relating the circumference of a circle to its linear dimension, the ratio of the circumference of a circle to its radius. It is useful in combination with trigonometric functions such as sin() and cos().
float x = width/2; float y = height/2; float d = width * 0.8; arc(x, y, d, d, 0, QUARTER_PI); arc(x, y, d-20, d-20, 0, HALF_PI); arc(x, y, d-40, d-40, 0, PI); arc(x, y, d-60, d-60, 0, TAU);
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