Function parseMouseEvent

app/static/js/mouse.js:223–237

* Parses a standard JavaScript mouse event into a TinyPilot-specific object * containing information about the mouse event. * * The mouse event data in TinyPilot-specific format. * * @typedef {Object} MouseEventData * @property {number} buttons - A bitmask representing which mouse buttons are

(evt)

 * @returns {MouseEventData}
 */
function parseMouseEvent(evt) {
  const boundingRect = evt.target.getBoundingClientRect();
  const cursorX = Math.max(0, evt.clientX - boundingRect.left);
  const cursorY = Math.max(0, evt.clientY - boundingRect.top);
  const width = boundingRect.right - boundingRect.left;
  const height = boundingRect.bottom - boundingRect.top;

  return {
    buttons: evt.buttons,
    relativeX: Math.min(1.0, Math.max(0.0, cursorX / width)),
    relativeY: Math.min(1.0, Math.max(0.0, cursorY / height)),
    verticalWheelDelta: normalizeWheelDelta(evt.deltaY),
    horizontalWheelDelta: normalizeWheelDelta(evt.deltaX),
  };
}