llAvatarOnSitTarget() & Changed Link Event Specification

[Artix Ruxton]

Situation:

Prims A and B are child prims in a linkset, both which have sit targets. When an avatar sits on prim A, prim B's changed event is called. It then follows the codeblocks if(llAvatarOnSitTarget()), which returns false since the avatar is sitting on prim A. Therefore the else codeblock in prim B's changed event, which is supposed to only be triggered when an avatar stands up from prim B, is wrongfully triggered.  

Question:

How do i specify the difference between when an avatar sits on prim A and no one is sitting on prim B, versus when someone stands up from prim B?  Both events are cause the same block of code to execute.

-- Artix

[Gearsawe Stonecutter]

Use llAvatarOnSitTarget() in the change event. It will return a NULL_KEY if nothing is sat on it and and return the AVs key when sat on. So record the last key and current key. When the last key is not null someone just stood up from it. While a user is sitting do not check current key is not null or else you will get a false negative for some on standing up. 

Also note if you have a sit target it cannot be zero rotation and zero position.

key current_key = NULL_KEY;key last_key = NULL_KEY;default{    state_entry()    {        llSitTarget(<0,0,1>, <0,0,0,1>);    }    changed(integer change)    {        if(change & CHANGED_LINK)        {            current_key = llAvatarOnSitTarget();            if(current_key != NULL_KEY && current_key != last_key)            {                llOwnerSay("I was just sat on");            }            else if (last_key != NULL_KEY && last_key != current_key)            {                llOwnerSay("some one just stood up from me");               }            last_key = current_key;        }    }}