实验五 裁剪原理

main()

{ int xl,xr,yt,yb; int x1,y1,x2,y2; struct point *p1,*p2; int gd=DETECT, gm=0; initgraph(&gd, &gm, \

xl=200;xr=400;yb=200;yt=400; setcolor(12);

line(xl,yt,xr,yt); line(xl,yb,xr,yb); line(xl,yt,xl,yb); line(xr,yt,xr,yb); x1=150;y1=150;x2=500;y2=300; setcolor(YELLOW); line(x1,y1,x2,y2);

p1=edgepoint(x1,y1,x2,y2,xl,xr,yb,yt);/*求出最靠近(x1,y1)的内点*/

p2=edgepoint(x2,y2,p1->x,p1->y,xl,xr,yb,yt); /*求出最靠近(x2,y2)的内点*/ getch();

setcolor(RED);

if(p1!=NULL&&p2!=NULL)

line(p1->x,p1->y,p2->x,p2->y); else

printf(\ getch();

closegraph(); }