F&quot; ).stroke( false );
        dot.setRadius( Math.abs(500 - time % 1000)/20 + 20 ); // dynamic radius that pulsates based on time
        form.circle( dot );

    }
}

</code></pre>

<p>Here we calculate the frame-rate and draw it as gray text on top-left corner.
Then we change the dot's radius based on elapsing time so that it will pulsate between 20px to 45px.</p>
<p><img alt="circle" src="../images/quick-start-guide/progress2.png" /></p>
<p>Now let's add some interactivity. CanvasSpace allows you to