atan2

atan2(y, x) → number · Math

Two-argument arc tangent. Converts Cartesian coordinates (x, y) to polar angle in radians.

• y (required): y-coordinate

• x (required): x-coordinate

atan2(1, 1)    // 0.7853981633974483 (π/4 — 45°)
atan2(0, -1)   // 3.141592653589793 (π — 180°)
atan2(-1, 0)   // -1.5707963267948966 (-π/2 — -90°)