atan2

Details #

atan2(y, x) takes exactly two arguments, y first and then x, and returns an angle in radians from -3.14159 to 3.14159. Unlike atan of a ratio, it uses the signs of both numbers to give the right quadrant.

The angle is measured counterclockwise from the positive x axis. To get degrees, multiply by 180 and divide by 3.14159265.

Parameters #

Takes 2 arguments. {{ atan2(text, b) }}

Examples #

atan2(1, 1)

round(atan2(dy, dx) * 180 / 3.14159265, 1)

Gotchas #

• Calling it with the wrong number of arguments is an error, for example atan2() takes 2 arguments, got 1.

• The order is y then x, the reverse of how you might say "x, y".

• Both arguments must be numbers: atan2() needs a number, got text.