C Program for Bresenham's Line Drawing Algorithm.

C Program for Bresenham's Line Drawing Algorithm:

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>

void main()

{

float dy,dx,x,y,x1,x2,y1,y2,p;

int gd,gm;

detectgraph(&gd,&gm);

initgraph(&gd,&gm,"C:\\Turboc3\\BGI");

printf("\n Enter 1st co-ordinate:");

scanf("%f%f",&x1,&y1);

printf("\n Enter 2nd co-ordinate:");

scanf("%f%f",&x2,&y2);

dx=abs(x2-x1);

        dy=abs(y2-y1);

if(x1<x2)

{

x=x1;

y=y1;

}

if(x1>x2)

{

x=x2;

y=y2;

}

p=(2*dy)-dx;

while(x<=x1 || x<=x2)

{

if(p<0)

{

x=x+1;

y=y;

p=p+(2*dy);

}

else

{

x=x+1;

y=y+1;

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

}

putpixel((int)x,(int)y,WHITE);

  }

  getch();

  closegraph();

}

OUTPUT