atan2

1.001.001.001.001.501.000.50

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Description

Description:

ArcTangent of y/x. Used to determine the angle of a vector [y,x]. Result in Degrees between -180 and 180.

ⓘ

This command can handle x being 0, unlike when using atan, and will return 90

⚠

This command has higher precedence than the select command, therefore beware of the case below:

_pos select 0 atan2 (_pos select 1) // error (_pos select 0) atan2 (_pos select 1) // OK

Alternatively, consider using the # operator: _pos # 0 atan2 _pos # 1

Groups:

Math - Geometry

Syntax

Syntax:

y atan2 x

Parameters:

y: Number

x: Number

Return Value:

Number

Examples

Example 1:

_yx = [5,3]; _degrees = (_yx select 0) atan2 (_yx select 1); // 59.0362

Example 2:

Get direction from _obj1 to _obj2:

_vd = getPosASL _obj2 vectorDiff getPosASL _obj1; _dir = (_vd select 0) atan2 (_vd select 1); // _dir range from -180 to +180 _dir = (_dir + 360) % 360; // _dir range from 0 to 360

Example 3:

Get relative direction from _obj1 to _obj2:

_yx = _obj1 worldToModel getPosASL _obj2; _dir = (_yx select 0) atan2 (_yx select 1); // _dir range from -180 to +180 _dir = (_dir + 360) % 360; // _dir range from 0 to 360

Additional Information

See also:

atan tan sin cos asin acos rad pi vectorCos BIS_fnc_dirTo getRelPos getRelDir

Notes

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