Function groupTransition

libs/echarts/echarts-en.simple.js:18047–18088

* Apply group transition animation from g1 to g2. * If no animatableModel, no animation.

(g1, g2, animatableModel, cb)

 * If no animatableModel, no animation.
 */
function groupTransition(g1, g2, animatableModel, cb) {
    if (!g1 || !g2) {
        return;
    }

    function getElMap(g) {
        var elMap = {};
        g.traverse(function (el) {
            if (!el.isGroup && el.anid) {
                elMap[el.anid] = el;
            }
        });
        return elMap;
    }
    function getAnimatableProps(el) {
        var obj = {
            position: clone$1(el.position),
            rotation: el.rotation
        };
        if (el.shape) {
            obj.shape = extend({}, el.shape);
        }
        return obj;
    }
    var elMap1 = getElMap(g1);

    g2.traverse(function (el) {
        if (!el.isGroup && el.anid) {
            var oldEl = elMap1[el.anid];
            if (oldEl) {
                var newProp = getAnimatableProps(el);
                el.attr(getAnimatableProps(oldEl));
                updateProps(el, newProp, animatableModel, el.dataIndex);
            }
            // else {
            //     if (el.previousProps) {
            //         graphic.updateProps
            //     }
            // }
        }
    });
}

/**
 * @param {Array.<Array.<number>>} points Like: [[23, 44], [53, 66], ...]