lazy-widgets/dist/helpers/getPointerEventNormPos.js

Typescript retained mode GUI for the HTML canvas API

/**
 * Extracts the position of a DOM MouseEvent and normalises it. Useful for
 * implementing mouse input.
 *
 * @returns Returns a 2-tuple containing the normalised coordinates; the first
 * element contains the normalised x axis, and the second element contains the
 * normalised y axis
 *
 * @category Helper
 */
export function getPointerEventNormPos(event, domElem) {
    const rect = domElem.getBoundingClientRect();
    return [
        (event.clientX - rect.left) / rect.width,
        (event.clientY - rect.top) / rect.height,
    ];
}
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