DDA LINE DRAWING ALGORITHM

DDA LINE DRAWING ALGORITHM

#include<stdio.h>

#include<conio.h>

#include<math.h>

#include<graphics.h>

#define ROUND(a)((int)(a+0.5))

void linebrel(int,int,int,int);

void main()

{

int gd=DETECT,gm,xa,xb,ya,yb;

clrscr();

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

printf("Enter the starting point of line:");

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

printf("Enter the ending points of line:");

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

linebrel(xa,ya,xb,yb);

getch();

}

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

{

int dx=xb-xa,dy=yb-ya,steps,k;

float xincrement,yincrement,x=xa,y=ya;

if(abs(dx)>abs(dy))

steps=abs(dx);

else

steps=abs(dy);

xincrement=dx/(float)steps;

yincrement=dy/(float)steps;

putpixel(ROUND(x),ROUND(y),5);

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

{

x+=xincrement;

y+=yincrement;

putpixel(ROUND(x),ROUND(y),5);

}

}

NOTE : . I am sharing knowledge for education purpose only.