C++ cmath atan2() function
Example
Return the angle in radians of the polar coordinates given rectangular coordinates:
cout << atan2(0.5, 0.5);
cout << atan2(-0.5, -0.5);
cout << atan2(5, 5);
cout << atan2(10, 20);
cout << atan2(5, -5);
cout << atan2(-10, 10);
Definition and Usage
The atan2() function 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.
The atan2() function is defined in the <cmath> header file.
Note: In the atan2() method the y coordinate goes first, then the x coordinate. This is because it is equivalent to the arctangent of the division y / x.
Syntax
One of the following:
atan2(double y, double x);atan2(float y, float x);Parameter Values
| Parameter | Description |
|---|---|
| y |
Required. The y coordinate of the point to find the angle of. If this is an integer type then it will be treated as a double.
|
| x |
Required. The x coordinate of the point to find the angle of. If this is an integer type then it will be treated as a double.
|
Technical Details
| Returns: | A float value (if all the arguments are float) or double value (in any other case) representing the angle in radians that a point (x, y) makes around the origin (0, 0). |
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