Write a program to implement DDA line drawing algorithm

Lalit Baghel

Software Developer

AIM - Write a program of line drawing using Digital Differential Analyzer (DDA) algorithm.

#include<iostream.h>

#include<conio.h>

#include<math.h>

#include<graphics.h>

void main() {
  clrscr();
  int x1, y1, x2, y2, dx, dy, step, i;
  int gd = DETECT, gm;
  float xinc, yinc, x, y;
  initgraph( & gd, & gm, "c:\\tc\\bgi");
  cout << "Enter the coordinates : \n\n";
  cout << "\n(x1,y1) : ";
  cin >> x1 >> y1;
  cout << "\n(x2,y2) : ";
  cin >> x2 >> y2;
  dx = x2 - x1;
  dy = y2 - y1;
  if (abs(dx) > abs(dy)) {
    step = abs(dx);
    xinc = dx / step;
    yinc = (float) dy / step;
  } else {
    step = abs(dy);
    xinc = (float) dx / step;
    yinc = dy / step;
  }
  x = x1;
  y = y1;
  for (i = 0; i <= step; i++) {
    putpixel(x1, y1, 2);
    x = x + xinc;
    y = y + yinc;
    x1 = (int)(x + 0.5);
    y1 = (int)(y + 0.5);
  }
  getch();
  closegraph();
}

Computer Graphics Multimedia and Animation

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