#include <stdio.h>
#include <graphics.h>
#include <math.h>
max(int a,int b)
{ if(a>b)
return a;
else
return b;
}
min(int a,int b)
{
if(a<b)
return a;
else
return b;
}
void DDA(int xs,int ys,int xe,int ye,int color)
{
float dx,dy,k,y,x;
dx = xe - xs;
dy = ye - ys;
if(dx == 0)
{
y = min(ys,ye);
x = xs;
while(y < max(ys,ye))
{
putpixel((int)x,(int)y,color);
y = y + 1;
delay(1000);
}
}
else
{
k = dy/dx;
if(fabs(k)<=1)
{
x = min(xs,xe);
if(x == xs)
y = ys;
else
y = ye;
for(;x < max(xe,xs);x++)
{
putpixel((int)x,(int)(y+0.5),color);
y = y + k;
delay(1000);
}
}
else
{ y = min(ys,ye);
if(y == ys)
x = xs;
else
x = xe;
for(;y<max(ys,ye);y++)
{
putpixel((int)(x+0.5),(int)y,color);
x = x + 1/k;
delay(1000);
}
}
}
}
main()
{ int driver = DETECT,graphmode,c;
initgraph(&driver,&graphmode,"c:\\TC");
setbkcolor(WHITE);
DDA(160,240,480,240,BLUE);
DDA(320,80,320,400,BLUE) ;
DDA(160,320,480,160,BLUE);
DDA(240,80,400,400,BLUE);
DDA(240,400,400,80,BLUE);
DDA(160,160,480,320,BLUE);
getch();
closegraph();
}
