Write a C++ program to draw a line using Bresenham’s line drawing algorithm.

#include<iostream.h>

#include<graphics.h>

#include<conio.h>

void drawline(int x0, int y0, int x1, int y1)

{

                int dx, dy,p,x,y;

                dx=x1-x0;

                dy=y1-y0;

                x=x0;

                y=y0;

                p=2*dy-dx;

                while(x<x1)

                {

                                if(p>=0)

                                {

                                                putpixel(x,y,7);

                                                y=y+1;

                                                p=p+2*dy-2*dx;

                                }

                                else

                                {

                                                putpixel(x,y,7);

                                                p=p+2*dy;

                                }

                                x=x+1;

                }

}

int main()

{

                int gd=DETECT, gm, error, x0,y0,x1,y1;

                initgraph(&gd,&gm,"c:\\turboc3\\bgi");

                cout<<"Enter the values of x0 and y0 :";

                cin>>x0>>y0;

                cout<<"Enter the vlaues of x1 and y1 :";

                cin>>x1>>y1;

                drawline(x0,y0,x1,y1);

                getch();

                return 0;

}