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原来是这样的，平面几何多直观啊，非要我折腾解析几何，我最头疼这个In Reply To:FT，这个算的是什么？ Posted by:js05 at 2005-06-05 11:05:31 double x, y, r, a, t, xl, xr;
scanf("%lf %lf %lf", &x, &y, &r);
a = atan2(y - Y, x - X);
t = asin(r / hypot(x - X, y - Y));
xl = X - Y * safe_cot(a - t);
xr = X - Y * safe_cot(a + t);
rec[2 * i].x = xl;
rec[2 * i].sign = 1;
rec[2 * i + 1].x = xr;
rec[2 * i + 1].sign = -1;
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