An essential constant for all trigonometry. Pi is the ratio of a circle’s circumferences to its diameter. Since pi is an irrational number, the pi in Chickadee is a mere floating point approximation that is “good enough.”
Half of pi.
Twice pi.
Return the cotangent of z.
Restrict x to the inclusive range defined by min and max. This procedure assumes that min is actually less than max.
Linearly interpolate the numbers start and end using the factor alpha, a number in the range [0, 1].
Convert degrees to radians.
Convert radians to degrees.