transform.js

/**
 * transform accessor utility
 */

function wrapMatrix(transformList, transform) {
  if (transform instanceof SVGMatrix) {
    return transformList.createSVGTransformFromMatrix(transform);
  }

  return transform;
}


function setTransforms(transformList, transforms) {
  var i, t;

  transformList.clear();

  for (i = 0; (t = transforms[i]); i++) {
    transformList.appendItem(wrapMatrix(transformList, t));
  }
}

/**
 * Get or set the transforms on the given node.
 *
 * @param {SVGElement} node
 * @param  {SVGTransform|SVGMatrix|Array<SVGTransform|SVGMatrix>} [transforms]
 *
 * @return {SVGTransform} the consolidated transform
 */
export default function transform(node, transforms) {
  var transformList = node.transform.baseVal;

  if (transforms) {

    if (!Array.isArray(transforms)) {
      transforms = [ transforms ];
    }

    setTransforms(transformList, transforms);
  }

  return transformList.consolidate();
}