Javascript mxEdgeStyle.js中[routePatterns]的含义是什么

在mxEdgeStyle.js中

routePatterns: [
    [ [ 513, 2308, 2081, 2562 ], [ 513, 1090, 514, 2184, 2114, 2561 ],
        [ 513, 1090, 514, 2564, 2184, 2562 ],
        [ 513, 2308, 2561, 1090, 514, 2568, 2308 ] ],

[ [ 514, 1057, 513, 2308, 2081, 2562 ], [ 514, 2184, 2114, 2561 ],
        [ 514, 2184, 2562, 1057, 513, 2564, 2184 ],
        [ 514, 1057, 513, 2568, 2308, 2561 ] ],

[ [ 1090, 514, 1057, 513, 2308, 2081, 2562 ], [ 2114, 2561 ],
        [ 1090, 2562, 1057, 513, 2564, 2184 ],
        [ 1090, 514, 1057, 513, 2308, 2561, 2568 ] ],

[ [ 2081, 2562 ], [ 1057, 513, 1090, 514, 2184, 2114, 2561 ],
        [ 1057, 513, 1090, 514, 2184, 2562, 2564 ],
        [ 1057, 2561, 1090, 514, 2568, 2308 ] ] ],

当我想计算航路点的方向时，我如何选择它

我是mxgraph的新手，谢谢