QUARTER_PI

A Number constant that's approximately 0.7854.

QUARTER_PI is one-fourth the value of the mathematical constant π. It's useful for many tasks that involve rotation and oscillation. For example, calling rotate(QUARTER_PI) rotates the coordinate system QUARTER_PI radians, which is an eighth of a turn (45˚).

Note: TWO_PI radians equals 360˚, PI radians equals 180˚, HALF_PI radians equals 90˚, and QUARTER_PI radians equals 45˚.