Math.atan2()
Returns the angle in radians between the positive x-axis and the point (x, y).
Syntax
Math.atan2(y, x)Parameters
| Name | Type | Required | Description |
|---|---|---|---|
y | number | Yes | The y coordinate of the point. |
x | number | Yes | The x coordinate of the point. |
Returns
number — The angle in radians, between -PI and PI.
Examples
console.log(Math.atan2(1, 1));
Output
0.7853981633974483
console.log(Math.atan2(1, 0) === Math.PI / 2);
Output
true
Notes
Note the argument order is (y, x), not (x, y). Unlike `Math.atan`, it uses the
signs of both arguments to return the correct quadrant. Convert to degrees with
`result * 180 / Math.PI`.
Browser & runtime support
| Environment | Since version |
|---|---|
| chrome | 1.0 |
| firefox | 1.0 |
| safari | 1.0 |
| edge | 12 |
| node | 0.10 |