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我用的是向量差积算面积In Reply To:用ABsinC/2求面积 ----> Posted by:Bluebird at 2005-07-21 21:02:19 > double getarea(int a, int b, int c)
> { int t1, t2, t3;
> double s1, s2, s3;
> t1 = (c + n - a) % n;
> s1 = d * sin(t1 * alph) / 2;
> t2 = (b + n - a) % n;
> s2 = d * sin(t2 * alph) / 2;
> t3 = (c + n - b) % n;
> s3 = d * sin(t3 * alph) / 2;
> return s2 + s3 - s1;
> }
>
>
> 调用的时候修改为
>
> getarea(0, cc[p], cc[i]);
> getarea(0, cc[p - 1], cc[i]);
> getarea(cc[i], cc[q], 0);
> getarea(cc[i], cc[q - 1], 0);
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