fabric/dist/src/controls/wrapWithFixedAnchor.mjs

Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.

/**
 * Wrap an action handler with saving/restoring object position on the transform.
 * this is the code that permits to objects to keep their position while transforming.
 * @param {Function} actionHandler the function to wrap
 * @return {Function} a function with an action handler signature
 */
function wrapWithFixedAnchor(actionHandler) {
  return (eventData, transform, x, y) => {
    const {
        target,
        originX,
        originY
      } = transform,
      centerPoint = target.getRelativeCenterPoint(),
      constraint = target.translateToOriginPoint(centerPoint, originX, originY),
      actionPerformed = actionHandler(eventData, transform, x, y);
    // flipping requires to change the transform origin, so we read from the mutated transform
    // instead of leveraging the one destructured before
    target.setPositionByOrigin(constraint, transform.originX, transform.originY);
    return actionPerformed;
  };
}

export { wrapWithFixedAnchor };
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