Set the return type of the operation as Point structure.
将操作的返回类型设置为Point结构。
Add a parameter named surface to the operation, and set its type to DrawingSurface.
向方法添加名为surface的参数，并将类型设置为DrawingSurface。
Add a parameter named surface to the operation, and set its type to DrawingSurface.
向方法添加名为surface的参数，并将类型设置为DrawingSurface。
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