Difference between revisions of "LlAvatarOnSitTarget"

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m
m (De-optimization of the helper script)
Line 15: Line 15:
 
     }
 
     }
  
     changed(integer change) {
+
     changed(integer change)
         if (change & CHANGED_LINK) {  
+
    {
 +
         if (change & CHANGED_LINK)
 +
        {  
 
             key av = llAvatarOnSitTarget();
 
             key av = llAvatarOnSitTarget();
             if (av) {//evaluated as true if not NULL_KEY or invalid
+
             if (av) // evaluated as true if key is valid and not NULL_KEY
 +
            {
 
                 llSay(0, "Hello " + llKey2Name(av) + ", thank you for sitting down");
 
                 llSay(0, "Hello " + llKey2Name(av) + ", thank you for sitting down");
 
             }
 
             }
Line 27: Line 30:
 
integer GetAgentLinkNumber(key avatar)
 
integer GetAgentLinkNumber(key avatar)
 
{
 
{
     integer linkNum = 1 + llGetNumberOfPrims();
+
     integer link_num = llGetNumberOfPrims();
    key linkKey;
+
while (link_num > 1) // Check only child prims.
    //Next we get the linkKey and make sure it's not null, if it's null we are done.
+
{
    while((linkKey = llGetLinkKey( --linkNum )))//is the key valid?
+
if (llGetLinkKey(link_num) == avatar) // If it is the avatar we want
        if(avatar == linkKey)//is it the avatar we want?
+
{
            return linkNum;//It's the avatar we want so return.
+
return link_num; // then return the link number
    //avatar wasn't not found
+
}
     //return a number that isn't a LINK_* flag not a valid link number either.
+
--link_num; // else go on with next child.
    return 0x7FFFFFFF;//max int.
+
}
}//Written by Strife Onizuka</lsl>
+
// Avatar wasn't found
 +
     return FALSE; // 0 (zero) for easy testing.
 +
}</lsl>
 
|related
 
|related
 
|also_tests
 
|also_tests

Revision as of 00:27, 4 August 2011

Summary

Function: key llAvatarOnSitTarget( );

Returns a key that is the UUID of the user seated on the prim.

If the prim lacks a sit target or there is no avatar sitting on the prim, then NULL_KEY is returned.

Caveats

  • A prim does not have a sit target unless llSitTarget has been called with a nonzero vector as the first argument.
  • If the prim lacks a sit target or the avatar is seated upon a different prim, the only way to determine how many and which avatars are seated upon the object is to scan the link set (for an example of this, see llGetNumberOfPrims).
All Issues ~ Search JIRA for related Bugs

Examples

<lsl>default {

   state_entry()
   {
       // set sit target, otherwise this will not work 
       llSitTarget(<0.0, 0.0, 0.1>, ZERO_ROTATION);
   }
   changed(integer change)
   {
       if (change & CHANGED_LINK)
       { 
           key av = llAvatarOnSitTarget();
           if (av) // evaluated as true if key is valid and not NULL_KEY
           {
               llSay(0, "Hello " + llKey2Name(av) + ", thank you for sitting down");
           }
       }
   }
}</lsl>

Useful Snippets

<lsl>//Gets the link number of a seated avatar integer GetAgentLinkNumber(key avatar) {

   integer link_num = llGetNumberOfPrims();

while (link_num > 1) // Check only child prims. { if (llGetLinkKey(link_num) == avatar) // If it is the avatar we want { return link_num; // then return the link number } --link_num; // else go on with next child. } // Avatar wasn't found

   return FALSE; // 0 (zero) for easy testing.

}</lsl>

Notes

The position of an avatar on a sit target can be determined with the use of llGetObjectDetails (see llSitTarget for an example).

See Also

Events

•  changed

Functions

•  llSitTarget
•  llGetLinkKey

Articles

•  CHANGED_LINK

Deep Notes

Search JIRA for related Issues

Signature

function key llAvatarOnSitTarget();