Difference between revisions of "LlAtan2"
Jump to navigation
Jump to search
Search JIRA for related Issues
(spacing) |
|||
| Line 1: | Line 1: | ||
{{ | {{LSL Function | ||
|func_id=3|func_sleep=0.0|func_energy=10.0 | |func_id=3|func_sleep=0.0|func_energy=10.0 | ||
|func=llAtan2|sort=Atan2 | |func=llAtan2|sort=Atan2 | ||
| Line 43: | Line 43: | ||
|also_articles= | |also_articles= | ||
{{LSL DefineRow||{{wikipedia|Atan2}}|}} | {{LSL DefineRow||{{wikipedia|Atan2}}|}} | ||
{{LSL DefineRow||{{wikipedia| | {{LSL DefineRow||{{wikipedia|Inverse trigonometric function}}|}} | ||
|notes | |notes | ||
|cat1=Math/Trigonometry | |cat1=Math/Trigonometry | ||
Revision as of 13:34, 17 February 2012
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Summary
Function: float llAtan2( float y, float x );| 3 | Function ID |
| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns a float that is the 
arctangent2 of y, x.
| • float | y | |||
| • float | x |
Similar to the arctangent(y/x) except it utilizes the signs of x & y to determine the quadrant and avoids division by zero. Returns zero if x and y are zero, returns PI/2 if x is zero and y is positive, returns -PI/2 if x is zero and y is negative.
The returned value is in the range [-PI, PI][1].
Caveats
Examples
<lsl>default {
state_entry()
{
float num1 = llFrand(100.0);
float num2 = llFrand(100.0);
llOwnerSay("y = " + (string)num1);
llOwnerSay("x = " + (string)num2);
llOwnerSay("The arctangent of y divided by x is " + (string)llAtan2(num1, num2));
}
}</lsl><lsl>//Function with input of a vector determining the position of a target and returning //a string with the literal compass-direction of that target towards your position //by Ramana Sweetwater 2009/01, any use allowed license :-) //corrected by Patrick Muggins
string compass (vector target) {
vector source = llGetPos(); list DIRS =["W","NW","N","NE","E","SE","S","SW","W"]; integer index = llCeil(3.5 - (4 * llAtan2(target.y - source.y, target.x - source.x) / PI)); return llList2String(DIRS, index);
}</lsl>
/Compass QASee Also
Deep Notes
Footnotes
- ^ The ranges in this article are written in Interval Notation.
Signature |
|---|
function float llAtan2( float y, float x ); |