CG : DDA Line Algorithm

#include<iostream.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>

void DDA(int x1,int y1,int x2,int y2,int col,int del);

void main()
{
 int gd=DETECT,gm,x1,x2,y1,y2;
 initgraph(&gd,&gm,"C:\\TC\\BGI");

 cout<<"Enter x1,y1 and (x2,y2) : ";
 cin>>x1>>y1>>x2>>y2;

 DDA(x1,y1,x2,y2,14,11);
 getch();
 closegraph();
}

void DDA(int x1,int y1,int x2,int y2,int col,int del)
{
 int dx,dy,s,i,xi,yi,x,y;
 x=x1,y=y1;
 dx=x2-x1;
 dy=y2-y1;

 if(dx>dy)
  s=dx;
 else
  s=dy;

 xi=dx/s;
 yi=dy/s;

 putpixel(x,y,col);
 for(i=0;i<s;i++)
 {
  x+=xi;
  y+=yi;
  putpixel(x,y,col);
  delay(del);
 }
}

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