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| ArcTangent of ''x/y''. Used to determine the angle of a vector ''[x,y]''. Result in [[Number#Degrees|Degrees]] between -180 and 180. | | ArcTangent of ''x/y''. Used to determine the angle of a vector ''[x,y]''. Result in [[Number#Degrees|Degrees]] between -180 and 180. | ||
<br><br> | <br><br> | ||
{{Informative | This command can handle ''y'' being 0, unlike when using [[atan]], and will return 90 }} | {{Feature | Informative | This command can handle ''y'' being 0, unlike when using [[atan]], and will return 90 }} | ||
<br> | <br> | ||
{{Important | Even though this command is a binary operator just like [[select]] command, it has [[SQF_syntax#Rules_of_Precedence | higher precedence]] than [[select]] command, therefore the following expression: <br><tt>_pos select 0 [[atan2]] (_pos select 1)</tt><br> will produce an error. The correct usage in this case will be: <br><tt>(_pos select 0) [[atan2]] (_pos select 1)</tt>}} | {{Important | Even though this command is a binary operator just like [[select]] command, it has [[SQF_syntax#Rules_of_Precedence | higher precedence]] than [[select]] command, therefore the following expression: <br><tt>_pos select 0 [[atan2]] (_pos select 1)</tt><br> will produce an error. The correct usage in this case will be: <br><tt>(_pos select 0) [[atan2]] (_pos select 1)</tt>}} | ||
Revision as of 00:00, 7 February 2021
Description
- Description:
- Description needed
- Groups:
- Math - Geometry
Syntax
- Syntax:
- Syntax needed
- Parameters:
- x: Number
- y: Number
- Return Value:
- Return value needed
Examples
- Example 1:
_xy = [5,3]; _degrees = (_xy select 0) atan2 (_xy 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 if (_dir < 0) then {_dir = 360 + _dir}; //_dir range from 0 to 360 - Example 3:
- Get relative direction from _obj1 to _obj2:
_xy = _obj1 worldToModel getPosASL _obj2; _dir = (_xy select 0) atan2 (_xy select 1); //_dir range from -180 to +180 if (_dir < 0) then {_dir = 360 + _dir}; //_dir range from 0 to 360
Additional Information
- See also:
- See also needed
Notes
-
Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note
- Posted on 08:00, 18 November 2009
- KeV
-
To get the direction of an object from the player:
_dir = ((getPos _obj select 0) - (getPos player select 0)) atan2 ((getPos _obj select 1) - (getPos player select 1)); //_dir will be from -180 to 180.If positive values are needed then use:if (_dir < 0) then {_dir = _dir + 360};Or just use BIS_fnc_dirTo directly.