Method rotate

src/common/overlay/levelRenderer/Matrix.js:116–133

* @function LevelRenderer.Tool.Matrix.prototype.rotate * @description 平移变换。 * @param {(Float32Array|Array. )} out - 单位矩阵。 * @param {(Float32Array|Array. )} a - 矩阵。 * @param {(Float32Array|Array. )} rad - 旋转参数。 * @returns {(Float32Array|Array. )} 结

(out, a, rad)

     * @returns {(Float32Array|Array.<number>)} 结果矩阵。
     */
    rotate(out, a, rad) {
        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 st = Math.sin(rad);
        var ct = Math.cos(rad);

        out[0] = aa * ct + ab * st;
        out[1] = -aa * st + ab * ct;
        out[2] = ac * ct + ad * st;
        out[3] = -ac * st + ct * ad;
        out[4] = ct * atx + st * aty;
        out[5] = ct * aty - st * atx;
        return out;
    }

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