# atan2()¶

Calculates the angle (in radians) from a specified point to the coordinate origin as measured from the positive x-axis.

## Examples¶

 ```1 2 3 4 5 6``` ```def draw(): py5.background(204) py5.translate(py5.width/2, py5.height/2) a = py5.atan2(py5.mouse_y - py5.height/2, py5.mouse_x - py5.width/2) py5.rotate(a) py5.rect(-30, -5, 60, 10) ```

## Description¶

Calculates the angle (in radians) from a specified point to the coordinate origin as measured from the positive x-axis. Values are returned as a float in the range from `PI` to `-PI`. The `atan2()` function is most often used for orienting geometry to the position of the cursor. Note: The y-coordinate of the point is the first parameter, and the x-coordinate is the second parameter, due the the structure of calculating the tangent.

This function makes a call to the numpy `atan2()` function.

## Syntax¶

```atan2(y: Union[float, npt.ArrayLike], x: Union[float, npt.ArrayLike]) -> Union[float, npt.NDArray]
```

## Parameters¶

• x: Union[float, npt.ArrayLike] - x-coordinate of the point

• y: Union[float, npt.ArrayLike] - y-coordinate of the point

Updated on February 26, 2022 13:22:44pm UTC