uva 11178 计算集合模板题

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题意：

求三角形行三个角三等分点射线交出的内三角形坐标。

代码：

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <stack>
#include <vector>
#include <queue>
#include <map>
#include <climits>
#include <cassert>
#define LL long longusing namespace std;
const int maxn = 1e6;
const int inf = 0x3f3f3f3f;
const double eps = 1e-8;
const double pi = acos(-1.0);
const double ee = exp(1.0);/
struct Point
{double x, y;Point(double x = 0, double y = 0) : x(x), y(y){}
};typedef Point Vector;Vector operator + (Vector A, Vector B)
{return Vector(A.x + B.x, A.y + B.y);
}Vector operator - (Point A, Point B)
{return Vector(A.x - B.x, A.y - B.y);
}Vector operator * (Vector A, double p)
{return Vector(A.x * p, A.y * p);
}Vector operator / (Vector A, double p)
{return Vector(A.x / p, A.y / p);
}bool operator < (const Point& a, const Point& b)
{return a.x < b.x || (a.x == b.x && a.y < b.y);
}int dcmp(double x)
{if (fabs(x) < eps){return 0;}else{return x < 0 ? -1 : 1;}
}bool operator == (const Point& a, const Point& b)
{return dcmp(a.x - b.x) == 0 && dcmp(a.y - b.y) == 0;
}double Dot(Vector A, Vector B)
{return A.x * B.x + A.y * B.y;
}double Length(Vector A)
{return sqrt(Dot(A, A));
}double Angle(Vector A, Vector B)
{return acos(Dot(A, B) / Length(A) / Length(B));
}double Cross(Vector A, Vector B)
{return A.x * B.y - A.y * B.x;
}double Area2(Point A, Point B, Point C)
{return Cross(B - A, C - A);
}Vector Rotate(Vector A, double rad)
{return Vector(A.x * cos(rad) - A.y * sin(rad), A.x * sin(rad) + A.y * cos(rad));
}Vector Normal(Vector A)//单位法线 turn left 90 degrees
{double L = Length(A);return Vector(-A.y / L, A.x / L);
}Point GetLineIntersection(Point P, Vector v, Point Q, Vector w)
{Vector u = P - Q;double t = Cross(w, u) / Cross(v, w);return P + v * t;
}
//Point getD(Point A, Point B, Point C)
{Vector v1 = C - B;double angle1 = Angle(A - B, v1);v1 = Rotate(v1, angle1 / 3);Vector v2 = B - C;double angle2 = Angle(A - C, v2);v2 = Rotate(v2, -angle2 / 3);return GetLineIntersection(B, v1, C, v2);
}Point readPoint()
{double x, y;scanf("%lf %lf", &x, &y);return Point(x, y);
}int main()
{#ifdef LOCALfreopen("in.txt", "r", stdin);#endif // LOCALint ncase;scanf("%d", &ncase);while (ncase--){Point A = readPoint();Point B = readPoint();Point C = readPoint();Point D = getD(A, B, C);Point E = getD(B, C, A);Point F = getD(C, A, B);printf("%.6lf %.6lf %.6lf %.6lf %.6lf %.6lf\n", D.x, D.y, E.x, E.y, F.x, F.y);}return 0;
}

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