Difference between revisions of "LlAtan2"
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(Add notation about range of return value) |
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|return_type=float | |return_type=float | ||
|return_text=that is the {{wikipedia|Atan2|arctangent2}} of y, x. | |return_text=that is the {{wikipedia|Atan2|arctangent2}} of y, x. | ||
|func_footnote=The returned value is in the range [-[[PI]], PI] | |||
|spec | |spec | ||
|caveats | |caveats | ||
Revision as of 06:29, 24 April 2009
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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 |
The returned value is in the range [-PI, PI]
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 :-)
string compass (vector target) {
vector me = llGetPos(); float distance = llVecDist(me, target); list DIRS =["W","NW","N","NE","E","SE","S","SW","W"]; return llList2String(DIRS,llCeil(4.5-((4*llAtan2((target.y-me.y)/distance,(target.x-me.x)/distance))/PI)));}</lsl>