Java Math atan2() Method
Example
Return the angle in radians of the polar coordinates given rectangular coordinates:
System.out.println(Math.atan2(0.5, 0.5));
System.out.println(Math.atan2(-0.5, -0.5));
System.out.println(Math.atan2(5, 5));
System.out.println(Math.atan2(10, 20));
System.out.println(Math.atan2(-5, -5));
System.out.println(Math.atan2(-10, 10));
Definition and Usage
The atan2() method returns the angle theta in radians from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta).
This is the same as calling atan(y/x) except that it takes into account negative values of x so that it can return angles outside of the range -PI/2 to PI/2.
Note:
In the atan2() method the y coordinate goes first, then the x coordinate. This is because it is doing the division y / x.
Syntax
public static double atan2(double y, double x)Parameter Values
| Parameter | Description |
|---|---|
| y | Required. The y coordinate of the point to find the angle of. |
| x | Required. The x coordinate of the point to find the angle of. |
Technical Details
| Returns: | A double value representing the angle in radians that a point (x, y) makes around the origin (0, 0). |
|---|---|
| Java version: | Any |
❮ Math Methods
