2、include"math,h”structrectangle(intxmin;intxmax;intymin;intymax;);structpoint(floatx;floaty;)；structpointpot[2];structrectanglerect=(150,490,100,380);intx=0,y=0;voidzhongxing(intx,inty,ints)(inti;for(i=x-5;i<=x+5;i++)(putpixel(i,y,s);)for(i=y-5;i<=y+5;i
3、++)(putpixel(x,i,s);))voidadd(intx,inty,inti)pot[i].x=x;pot[i].y=y;)intclip(floatq,floatd,float*t0,float*tl)(floatr;if(q<0)(r=d/q;if(r>*tl)return(0);elseif(r>*t0)(*t0=r;return(1);))elseif(q>0)(r=d/q;if(r<*t0)return(0);elseif(r<*tl)(*tl=r;return(1);))el
4、seif(d<0)return(0);return(1);)voidliang(structpoint*pot,structrectangle*rect)(floatdelatx,delaty,tO,tl;t0=0;tl=l;delatx=pot[1]・x-pot[0]・x;if(clip(-delatx,pot[0].x-rect->xmin,&t0,&tl))if(clip(delatx,rect->xmax-pot[0].x,&t0,&tl))(delaty=pot[1].y-pot[0].y
5、;if(clip(-delaty,pot[0].y-rect->ymin,&t0,&tl))if(clip(delaty,rect->ymax-pot[0].y,&t0,&tl))(line((int)(pot[0].x+t0*delatx),(int)(pot[0].y+t0*delaty),(int)(pot[0].x+tl*delatx),(int)(pot[0].y+tl*delaty));)))voidmain()(intdriver=DETECT,mode;inti=0,j,key;re
6、gisterbgidriver(EGAVGA_driver);initgraph(&driver,&mode,"\tc");initgraph(&driver,&mode,"\tc");zhongxing(x,y,4);setcolor(3);rectangle(150,100,490,380);/**/for(;;)(if(bioskey(1))(key=bioskey(0):if(key==0x4d00)(zhongxing(x,y,0);x+=5;zhongxing(x,y,4);rect
7、angle(150,100,490,380);)if(key==0x011b){printf("escbepress*);break;)if(key=0x4b00)(zhongxing(x,y,0);x-=5;zhongxing(x,y,4);rectangle(150,100,490,380);)if(key==0x5000)(zhongxing(x,y,0);y+=5;zhongxing(x,y,4);rectangle(150,100,490,380);)if(key==0x4800)(zho
8、ngxing(x,y,0);y-=5;zhongxing(x,y,4);rectangle(150,100,490,380);)if(key==OxlcOd)(add(x,y,i)；circle(x,y,3);i+=l;}if(key==0x3920)(liang(pot,&rect);for(j=0;j<2;j++)(pot[j].x=0;pot[j].y=0;}i=0;)))getch();closegraph();)一程序2(1)DDA算法程序实现的完整源程序#
