atan2: Difference between revisions
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Lou Montana (talk | contribs) m (Text replacement - ":<code>" to ": <code>") |
Lou Montana (talk | contribs) m (Text replacement - "<code>([^\[]+)<\/code>" to "<sqf>$1</sqf>") |
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(23 intermediate revisions by the same user not shown) | |||
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|r1= [[Number]] | |r1= [[Number]] | ||
|x1= < | |x1= <sqf>_xy = [5,3]; | ||
_degrees = (_xy | _degrees = (_xy select 0) atan2 (_xy select 1); // 59.0362</sqf> | ||
|x2= Get direction from _obj1 to _obj2: | |x2= Get direction from _obj1 to _obj2: | ||
< | <sqf>_vd = getPosASL _obj2 vectorDiff getPosASL _obj1; | ||
_dir = (_vd | _dir = (_vd select 0) atan2 (_vd select 1); // _dir range from -180 to +180 | ||
_dir = (_dir + 360) % 360; | _dir = (_dir + 360) % 360; // _dir range from 0 to 360</sqf> | ||
|x3= Get relative direction from _obj1 to _obj2: | |x3= Get relative direction from _obj1 to _obj2: | ||
< | <sqf>_xy = _obj1 worldToModel getPosASL _obj2; | ||
_dir = (_xy | _dir = (_xy select 0) atan2 (_xy select 1); // _dir range from -180 to +180 | ||
_dir = (_dir + 360) % 360; | _dir = (_dir + 360) % 360; // _dir range from 0 to 360</sqf> | ||
|seealso= [[atan]] [[tan]] [[sin]] [[cos]] [[asin]] [[acos]] [[rad]] [[pi]] [[vectorCos]] [[getPos]] [[getRelPos]] [[Math Commands]] | |seealso= [[atan]] [[tan]] [[sin]] [[cos]] [[asin]] [[acos]] [[rad]] [[pi]] [[vectorCos]] [[getPos]] [[getRelPos]] [[Math Commands]] | ||
Line 59: | Line 59: | ||
<dd class="note"> | <dd class="note"> | ||
To get the direction of an object from the player: | To get the direction of an object from the player: | ||
< | <sqf>_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. | //_dir will be from -180 to 180. | ||
</ | </sqf> | ||
If positive values are needed then use: | If positive values are needed then use: | ||
< | <sqf>if (_dir < 0) then {_dir = _dir + 360};</sqf> | ||
</ | |||
Or just use [[BIS_fnc_dirTo]] directly. | Or just use [[BIS_fnc_dirTo]] directly. | ||
</dl> | </dl> |
Revision as of 20:08, 13 May 2022
Description
- Description:
- ArcTangent of y/x. Used to determine the angle of a vector [x,y]. Result in Degrees between -180 and 180.
- Groups:
- Math - Geometry
Syntax
Examples
- Example 1:
- Example 2:
- Get direction from _obj1 to _obj2:
- Example 3:
- Get relative direction from _obj1 to _obj2:
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
- Posted on 08:00, 18 November 2009
- KeV
-
To get the direction of an object from the player:
If positive values are needed then use: Or just use BIS_fnc_dirTo directly.
Categories:
- Scripting Commands
- Introduced with Operation Flashpoint version 1.00
- Operation Flashpoint: New Scripting Commands
- Operation Flashpoint: Scripting Commands
- Operation Flashpoint: Elite: Scripting Commands
- ArmA: Armed Assault: Scripting Commands
- Arma 2: Scripting Commands
- Arma 2: Operation Arrowhead: Scripting Commands
- Take On Helicopters: Scripting Commands
- Arma 3: Scripting Commands
- Command Group: Math - Geometry