给大家看张渔网，运行的时候请设置好图形驱动的路径。 #include <graphics.h>#include <math.h> void ellip(int x0,int y0,int a,int b,int dt){int x,y,n,i; float t1,t=0; t1=dt*0.0174533; n=360/dt; moveto(x0+a,y0); for(i=1;i<n;i++) {t=t+t1;  x=x0+a*cos(t);  y=y0+b*sin(t);  lineto(x,y); } lineto(x0+a,y0);} main(){int i,a=200,x=320,y=200; int driver=DETECT,mode; registerbgidriver(EGAVGA_driver); initgraph(&driver,&mode,""); cleardevice(); setbkcolor(9); setcolor(4); for(i=0;i<=200;i=i+10) {ellip(x,y,a-i,i,10); } getch(); closegraph();}

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