最近在看原始碼的時候，看到這樣的幾個進行座標系轉換的函式。convertToNodeSpace、convertToWorldSpace、convertToNodeSpaceAR、convertToWorldSpaceAR，在他們的下一層看到下面的註釋：

/**

* Converts a Point to node (local) space coordinates. The result is in Points.

*/

Point convertToNodeSpace(const Point& worldPoint) const;

/**

* Converts a Point to world space coordinates. The result is in Points.

*/

Point convertToWorldSpace(const Point& nodePoint) const;

/**

* Converts a Point to node (local) space coordinates. The result is in Points.

* treating the returned/received node point as anchor relative.

*/

Point convertToNodeSpaceAR(const Point& worldPoint) const;

/**