Button Click Detector

<lsl> // This script assumes a grid of 4 columns, 3 rows of buttons as listed in the 'buttons' list below. // But you can change it as you like, just change horizontal to the # of columns and vertical to the # of rows, // and of course the buttons list must be updated as well. Other than that the code (and more importantly, the MATH) // should not need updating.

integer horizontal = 4; integer vertical = 3; list buttons = [ "brown", "red", "orange", "yellow", "blue", "cyan", "lblue", "gray", "green", "puke", "purple", "pink" ];

default {

   state_entry()
   {
       llSay(0, "Hello, Avatar!");
   }
   
   touch_start(integer total_number)
   {
       vector v = llDetectedTouchUV(0);
       
       if( v == TOUCH_INVALID_TEXCOORD ) {
           llSay(0, "I don't know what you just did.");
           return;
       }

       float x = v.x;
       float y = 1.0-v.y;
       
       integer idx;
       integer rowno;
       integer colno;
       
       rowno = (integer)(y / (1.0/(float)vertical));
       colno = (integer)(x / (1.0/(float)horizontal));
       
       idx = rowno*horizontal + colno;

       if( idx > llGetListLength(buttons) ) {
           llSay(0, "Great, you stumped me. Bugger off.");
           return;
       }        
       
       llSay(0, "Click at " + (string)x + ", " + (string)y);        
       llSay(0, "That is, row " + (string)rowno + ", col " + (string)colno);
       llSay(0, "That is, you clicked near the " + llList2String(buttons,idx) + " button.");
   }

} </lsl>