Function getTransform

libs/echarts/echarts.simple.js:17986–17995

* Get transform matrix of target (param target), * in coordinate of its ancestor (param ancestor) * * @param {module:zrender/mixin/Transformable} target * @param {module:zrender/mixin/Transformable} [ancestor]

(target, ancestor)

 * @param {module:zrender/mixin/Transformable} [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.