How can I control FPS in web animations using requestAnimationFrame?

Regulating FPS with requestAnimationFrame

In the world of web animation, requestAnimationFrame (rAF) reigns supreme, providing unparalleled smoothness and optimization. However, users may encounter scenarios where animations exhibit inconsistent frame rates. To address this, let's explore methods to control the FPS with rAF.

As the name suggests, rAF is primarily intended for smooth animations. Locking it to a specific FPS could potentially introduce choppiness. Yet, there are techniques to achieve this effect.

One approach involves leveraging time-based throttling. We can calculate the elapsed time since the last animation frame and only trigger the drawing process when a specified FPS interval has passed.

<code class="javascript">var fpsInterval = 1000 / fps;

function animate() {
  now = Date.now();
  elapsed = now - then;

  if (elapsed > fpsInterval) {
    // Calculate next frame using adjusted interval
    then = now - (elapsed % fpsInterval);

    // Insert drawing code here
  }
  requestAnimationFrame(animate);
}</code>

This method ensures that drawing only occurs at the desired FPS, maintaining consistency and preventing drastic variations in animation speed.

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