102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
#include<stdio.h>
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#include<string.h>
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#include<math.h>
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#include<algorithm>
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using namespace std;
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const double eps = 1e-5;
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const double PI = acos(-1.0);
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struct point
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{
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double x, y;
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};
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struct gao
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{
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double mz,zc;
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};
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struct gao gg[10];
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bool cmp(gao a,gao b)
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{
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if(a.mz!=b.mz)
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return a.mz>b.mz;
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return a.zc>b.zc;
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}
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double xmult(double x1,double y1,double x2,double y2,double x0,double y0)
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{
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return (x1-x0)*(y2-y0)-(x2-x0)*(y1-y0);
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}
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int same_side(point p1,point p2,point l1,point l2)
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{
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return xmult(l1.x,l1.y,p1.x,p1.y,l2.x,l2.y)*xmult(l1.x,l1.y,p2.x,p2.y,l2.x,l2.y)>0;
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}
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double dis(point a,point b)
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{
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return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
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}
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point intersection(point u1,point u2,point v1,point v2)
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{
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point ret=u1;
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double t=((u1.x-v1.x)*(v1.y-v2.y)-(u1.y-v1.y)*(v1.x-v2.x))
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/((u1.x-u2.x)*(v1.y-v2.y)-(u1.y-u2.y)*(v1.x-v2.x));
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ret.x+=(u2.x-u1.x)*t;
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ret.y+=(u2.y-u1.y)*t;
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return ret;
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}
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double aera(point a,point b,point c)
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{
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double aa,bb,cc,q;
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aa=dis(c,b);
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bb=dis(a,c);
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cc=dis(b,a);
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q=(aa+bb+cc)/2;
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double h=sqrt(q*(q-aa)*(q-bb)*(q-cc));
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h=(int)(h*1000+0.5);
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return h*0.001;
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}
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double get_zc(point a,point b,point c)
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{
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double aa,bb,cc,q;
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aa=dis(c,b);
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bb=dis(a,c);
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cc=dis(b,a);
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q=(aa+bb+cc);
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return q;
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}
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int main()
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{
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int i;
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double x1,y1,x2,y2,x3,y3,x4,y4;
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point a,b,c,d,e;
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while(scanf("%lf%lf%lf%lf%lf%lf%lf%lf",&x1,&y1,&x2,&y2,&x3,&y3,&x4,&y4)!=EOF)
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{
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if(x1==0 && y1==0 && x2==0 && y2==0 && x3==0 && y3==0 && x4==0 && y4==0)
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break;
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a.x=x1;
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a.y=y1;
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b.x=x2;
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b.y=y2;
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c.x=x3;
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c.y=y3;
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d.x=x4;
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d.y=y4;
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if(same_side(a, b, c,d)==0)
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e = intersection(d,c,a,b);
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else if(same_side(d, b, c, a)==0)
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e = intersection(d,b,c,a);
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else
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e = intersection(b,c,d,a);
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gg[0].mz=aera(a,b,e);
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gg[1].mz=aera(b,c,e);
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gg[2].mz=aera(c,d,e);
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gg[3].mz=aera(a,d,e);
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gg[0].zc=get_zc(a,b,e);
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gg[1].zc=get_zc(b,c,e);
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gg[2].zc=get_zc(c,d,e);
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gg[3].zc=get_zc(a,d,e);
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sort(gg,gg+4,cmp);
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for(i=0; i<3; i++)
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printf("%.3lf %.3lf ",gg[i].mz,gg[i].zc);
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printf("%.3lf %.3lf\n",gg[i].mz,gg[i].zc);
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}
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return 0;
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}
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