Function scale

libs/echarts/echarts.simple.js:1046–1050

* 向量缩放 * @param {Vector2} out * @param {Vector2} v * @param {number} s

(out, v, s)

 * @param {number} s
 */
function scale(out, v, s) {
    out[0] = v[0] * s;
    out[1] = v[1] * s;
    return out;
}

/**
 * 向量归一化