Program for Line Drawing using DDA algorithm

#include<stdio.h>

#include<math.h>

#include<conio.h>

#include<graphics.h>

void main()

{

int gd=DETECT,gm;

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

void line_dda(int,int,int,int);

int xa,xb,ya,yb;

printf("Enter the co-ordinates of point A(x1,y1) :");

scanf("%d%d",&xa,&ya);

printf("Enter the co-ordinates of point B(x2,y2) :");

scanf("%d%d",&xb,&yb);

cleardevice();

line_dda(xa,ya,xb,yb);

getch();

closegraph();

}

void line_dda(int xa,int ya,int xb,int yb)

{

int Dx=xb-xa,Dy=yb-ya,steps,k;

float xin,yin,X=xa,Y=ya;

if(abs(Dx)>abs(Dy))

steps=abs(Dx);

else

steps=abs(Dy);

xin=Dx/(float)steps;

yin=Dy/(float)steps;

putpixel(X,Y,6);

for(k=0;k<steps;k++)

{

X=X+xin;

Y=Y+yin;

putpixel(X,Y,6);

}

}

OUTPUT