Method invert

src/common/overlay/levelRenderer/Matrix.js:162–183

* @function LevelRenderer.Tool.Matrix.prototype.invert * @description 求逆矩阵。 * @param {(Float32Array|Array. )} out - 单位矩阵。 * @param {(Float32Array|Array. )} a - 矩阵。 * @returns {(Float32Array|Array. )} 结果矩阵。

(out, a)

     * @returns {(Float32Array|Array.<number>)} 结果矩阵。
     */
    invert(out, a) {
        var aa = a[0];
        var ac = a[2];
        var atx = a[4];
        var ab = a[1];
        var ad = a[3];
        var aty = a[5];

        var det = aa * ad - ab * ac;
        if (!det) {
            return null;
        }
        det = 1.0 / det;

        out[0] = ad * det;
        out[1] = -ab * det;
        out[2] = -ac * det;
        out[3] = aa * det;
        out[4] = (ac * aty - ad * atx) * det;
        out[5] = (ab * atx - aa * aty) * det;
        return out;
    }

    /**
     * @function LevelRenderer.Tool.Matrix.prototype.mulVector