Function identity

libs/echarts/echarts.simple.js:2613–2621

* 设置矩阵为单位矩阵 * @param {Float32Array|Array. } out

(out)

 * @param {Float32Array|Array.<number>} out
 */
function identity(out) {
    out[0] = 1;
    out[1] = 0;
    out[2] = 0;
    out[3] = 1;
    out[4] = 0;
    out[5] = 0;
    return out;
}

/**
 * 复制矩阵