Implementation of Bresenham's line drawing algorithm [CS1255 - Graphics and Multimedia Lab]

AIM:

      To write a "C++" program for the implementation of Bresenham's line drawing algorithm in CS1255 - Graphics and Multimedia Lab.

SOURCE CODE:

#include<iostream.h>
#include<conio.h>
#include<math.h>
#include<graphics.h>
class lines
{
 private:
 int dx,dy,x,y,xend,p,xa,ya,xb,yb;
 public:
  void getdata();
  void line();
  void disdata();
};
 void lines::getdata()
 {
  cout<<"\n\tEnter xa and ya :";
  cin>>xa>>ya;
  cout<<"\n\tEnter xb and yb :";
  cin>>xb>>yb;
 }
 void lines::line()
 {
  dx=abs(xa-xb);
  dy=abs(ya-yb);
  p=2*dy-dx;
   if(xa>xb)
   {
    x=xb;
    y=yb;
    xend=xa;
   }
   else
   {
    x=xa;
    y=ya;
    xend=xb;
   }
  }

  void lines::disdata()
  {
   putpixel(x,y,1);

   while(x<xend)
   {
    x=x+1;
    if(p<0)
    {
     p=p+2*dy;
    }
    else
    {
     y=y+1;
     p=p-2*dy-2*dx;
    }
    putpixel(x,y,1);
   }
  }
  void main()
  {
  lines l;
  clrscr();
  int gd=DETECT,gm;
  initgraph(&gd,&gm,"C:/TC/BGI");
  l.getdata();
  l.line();
  l.disdata();
  getch();
  closegraph();
  }

OUTPUT:

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2 comments

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dietzwallace
AUTHOR
April 15, 2011 at 9:02 PM delete

Tried it on desktop but the line is not displaying.

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JJ
AUTHOR
April 19, 2011 at 1:25 PM delete

Actually its working fine. Just now checked again.

1)Check the path C:/TC/BGI
Give as in your system. If you are having TC in other drive means, Change it to that.

2)It displays a blue line. You might not recognized that.

3)Give big values. Because its pixel value of starting and end point.
For example, Give xa=10, ya=20, xb=50, yb=60.

Here in this website, All the programs were output verified by me. So no problem with the coding.

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