1直线段的裁剪算法Cohen-Sutherland
2二次、三次Bezier曲线，二次、三次均匀B样条曲线(过首末顶点)(不会抖动)-1 line of the cutting algorithm Cohen-Sutherland 2 Second, Bezier curves, second, third uniform B-spline curves (after the end of the first peak) (no jitter)
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