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{{Command|Comments= | {{Command|Comments= | ||
| ofp |Game name= | | ofp |Game name= | ||
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|gr1= Math - Geometry |GROUP1= | |gr1= Math - Geometry |GROUP1= | ||
| 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. | ||
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<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>}}|DESCRIPTION= | {{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>}}|DESCRIPTION= | ||
| x '''atan2''' y |SYNTAX= | | x '''atan2''' y |SYNTAX= | ||
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<br><br>[[Image:atan.jpg|200px]]|RETURNVALUE= | <br><br>[[Image:atan.jpg|200px]]|RETURNVALUE= | ||
|x1= <code>_xy = [5,3]; | |x1= <code>_xy = [5,3]; | ||
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_dir = (_xy [[select]] 0) [[atan2]] (_xy [[select]] 1); //_dir range from -180 to +180 | _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</code>|EXAMPLE3= | [[if]] (_dir < 0) [[then]] {_dir = 360 + _dir}; //_dir range from 0 to 360</code>|EXAMPLE3= | ||
Revision as of 01:28, 17 January 2021
Description
- Description:
- ArcTangent of x/y. Used to determine the angle of a vector [x,y]. Result in Degrees between -180 and 180.
- Groups:
- Math - Geometry
Syntax
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
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
Notes
- 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.
Bottom Section
Categories:
- Scripting Commands
- Introduced with Operation Flashpoint version 1.00
- Operation Flashpoint: New Scripting Commands
- Operation Flashpoint: Scripting Commands
- Command Group: Math - Geometry
- Scripting Commands OFP 1.99
- Scripting Commands OFP 1.96
- Scripting Commands OFP 1.46
- ArmA: Armed Assault: Scripting Commands
- Arma 2: Scripting Commands
- Arma 3: Scripting Commands
- Take On Helicopters: Scripting Commands