2.DDA Line Drawing Algorithm Using C Programming

#include<stdio.h>

#include<math.h>

#include<conio.h>

#include<graphics.h>

#define round(val) (int)(val+0.5)

void main() {

int gd = DETECT, gm;

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

int xa, xb, ya, yb;

printf("Enter the two values");

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

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

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(round(X), round(Y), 6);

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

X = X + xin;

Y = Y + yin;

putpixel(round(X), round(Y), 6);

}

}