Function getTransform

_benchmarks/sample_echarts.js:14523–14532

* Get transform matrix of target (param target), * in coordinate of its ancestor (param ancestor) * * @param target * @param [ancestor]

(target, ancestor)

     */

    function getTransform(target, ancestor) {
      var mat = identity([]);

      while (target && target !== ancestor) {
        mul$1(mat, target.getLocalTransform(), mat);
        target = target.parent;
      }

      return mat;
    }
    /**
     * Apply transform to an vertex.
     * @param target [x, y]