dda.txt

在ＴＣ环境下实现圆的生成与直线的裁减和ＤＤＡ算法生成直线！

#include<stdio.h>
#include<math.h>
#include<graphics.h>
void dda_line(xa,ya,xb,yb,c)
int xa,ya,xb,yb,c;
{float delta_x,delta_y,x,y;
int dx,dy,steps,k;
dx=xb-xa;
dy=yb-ya;
if(abs(dx)>abs(dy))
    steps=abs(dx);
else steps=abs(dy);
delta_x=(float)dx/(float)steps;
delta_y=(float)dy/(float)steps;
x=xa;
y=ya;
putpixel(x,y,c);
for(k=1;k<=steps;k++)
{ x+=delta_x;
  y+=delta_y;
  putpixel(x,y,c);
}
}
main()
{int x0,y0,x1,y1,c;
int gdriver=DETECT,gmode;
printf("Input the x0,y0:");
scanf("%d,%d",&x0,&y0);
printf("Input the x1,y1,c:");
scanf("%d,%d,%d",&x1,&y1,&c);
initgraph(&gdriver,&gmode,"d:\\tc20");
cleardevice();
dda_line(x0,y0,x1,y1,c);
getch();
closegraph();
}