How to use the first quadrant of the arc to point by point comparison method, x, y coordinates are increasing, the FM has been greater than r not yet

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Point by point comparison method in a straight line and arc interpolation algorithm and realization https://blog.csdn.net/whocarea/article/details/84991961
In c + + simulation of linear interpolation and circular interpolation https://blog.csdn.net/z893345329/article/details/25922857