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example pic
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, TWO_PI);
Description QUARTER_PI is a mathematical constant with the value 0.7853982. It is one quarter the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions sin() and cos().
Updated on July 4, 2018 11:56:44am EDT

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