Program to Draw a Line using DDA Algorithm --- Computer Graphics Lab

Program to Draw a Line using DDA Algorithm --- Computer Graphics Lab

/**** Program to Draw a Line using DDA Algorithm ****/

#include <stdio.h>

#include <dos.h>

#include <graphics.h>

void lineDDA(int, int, int, int);

void main()

{

int x1, y1, xn, yn;

int gd = DETECT, gm;

initgraph(&gd, &gm, "");

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

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

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

scanf("%d %d", &xn, &yn);

lineDDA(x1, y1, xn, yn);

getch();

}

void lineDDA(int x1, int y1, int xn, int yn)

{

int dx, dy, m, i;

m = (yn-y1)/(xn-x1);

for (i=x1; i<=xn; i++)

{

if (m <= 1)

{

dx = 1;

dy = m * dx;

}

else

{

dy = 1;

dx = dy / m;

}

x1 = x1 + dx;

y1 = y1 + dy;

putpixel(x1, y1, RED);

delay(20);

}

}

--

Don't ever give up.

Even when it seems impossible,

Something will always

pull you through.

The hardest times get even

worse when you lose hope.

As long as you believe you can do it, You can.

But When you give up,

You lose !

I DONT GIVE UP.....!!!

with regards

prem sasi kumar arivukalanjiam