This code dynamically updates the position of what is presumably...

September 5, 2025 at 04:38 PM

function updateGlow() { if (glowNeedsUpdate) { document.body.style.setProperty('--glow-x', glowX + 'px'); document.body.style.setProperty('--glow-y', glowY + 'px'); glowNeedsUpdate = false; } requestAnimationFrame(updateGlow); } document.addEventListener('mousemove', function(e) { glowX = e.clientX; glowY = e.clientY; glowNeedsUpdate = true; }); updateGlow();

This code dynamically updates the position of what is presumably a "glow" effect (likely defined in CSS using custom properties). Here's what it does:

  1. updateGlow function:

    • If the variable glowNeedsUpdate is true:
      • It updates two CSS custom properties: --glow-x and --glow-y. These properties are set on the <body> element and are assigned the values of glowX and glowY (which are calculated as the current mouse coordinates in pixels).
      • It then sets glowNeedsUpdate to false.
    • Regardless of whether the glow was updated or not, it continuously schedules the updateGlow function to run on the next animation frame using requestAnimationFrame.

  2. Mousemove Event Listener:

    • An event listener on the mousemove event captures the user's cursor position on the screen.
    • When the mouse moves, it updates glowX with the cursor's X position (e.clientX) and glowY with the Y position (e.clientY).
    • It also sets glowNeedsUpdate to true, signaling that the glow effect needs to be recalculated.

  3. Execution:

    • The updateGlow function is initially invoked, setting up a loop that runs continuously.
    • When the cursor moves, the mousemove event updates the coordinates (glowX and glowY) and triggers an update to the "glow effect" in the next animation frame.

Summary: The code tracks the mouse cursor movement and updates CSS variables --glow-x and --glow-y, which are likely used for a visual "glow" or highlighting effect. This update happens smoothly and in sync with the frame rate due to the use of requestAnimationFrame.

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