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Name | ### HALF_PI
Examples |
    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 | HALF_PI is a mathematical constant with the value 1.57079632679489661923. It is half the ratio of the circumference of a circle to its diameter. It is useful in combination with the trigonometric functions sin() and cos().
Related | PI TWO_PI TAU QUARTER_PI

Updated on May 19, 2014 05:30:02pm PDT