lrj训练指南 P259

//====================================================================Point getP(Point A,Point B,Point C){    double a1=Angle(A-B,C-B);    Vector v1=Rotate(C-B,a1/3);    double a2=Angle(A-C,B-C);    Vector v2=Rotate(B-C,-a2/3);    return GetLineIntersection(B,v1,C,v2);}int main(){    int T;    Point A,B,C,D,E,F;    scanf("%d",&T);    while(T--)    {        A.read();        B.read();        C.read();        D=getP(A,B,C);        E=getP(B,C,A);        F=getP(C,A,B);        printf("%.6lf %.6lf %.6lf %.6lf %.6lf %.6lf\n",D.x,D.y,E.x,E.y,F.x,F.y);    }}