#pragma strict
 
var updateInterval = 0.5;
 
private var accum = 0.0; // FPS accumulated over the interval
private var frames = 0; // Frames drawn over the interval
private var timeleft : float; // Left time for current interval
 
function Start()
{
    if( !GetComponent.<GUIText>() )
    {
        print ("FramesPerSecond needs a GUIText component!");
        enabled = false;
        return;
    }
    timeleft = updateInterval;  
}
 
function Update()
{
    timeleft -= Time.deltaTime;
    accum += Time.timeScale/Time.deltaTime;
    ++frames;
 
    // Interval ended - update GUI text and start new interval
    if( timeleft <= 0.0 )
    {
        // display two fractional digits (f2 format)
        GetComponent.<GUIText>().text = "fps: " + (accum/frames).ToString("f2");
        timeleft = updateInterval;
        accum = 0.0;
        frames = 0;
    }
}