Line

Include:
conio.h
dos.h
stdio.h
process.h
graphics.h
math.h

void DDA_Line();
void Bresenham_Line();


void main()
{
   int x,y,x1,y1,x2,y2,i,dx,dy,len,e,r,d,gd,gm,ch;
   char ans;
   clrscr();

   do
   {
 printf("\n\n-------------Menu-----------");
 printf("\n 1. DDA Line");
 printf("\n 2. Bresenham's Line");
 printf("\n 3. Exit");
 printf("\n\n Enter your choice : ");
 scanf("%d",&ch);

 switch(ch)
 {
     case 1:
  DDA_Line();
     break;
     case 2:
  Bresenham_Line();
     break;
     case 3:
  exit(1);
 }
 printf("\n\n Do You Want to Continue ? (Y/N) :  ");
 ans=getche();
   }while(ans=='Y'||ans=='y');
}

//---------DDA Line Algorithm-----------------
void DDA_Line()
{
   int gd,gm,x1,x2,y1,y2,len,x,y,i,dx,dy;
   printf("\n Enter Values as (X1,Y1) & (X2,Y2) :  ");
   scanf("%d %d %d %d",&x1,&y1,&x2,&y2);
   detectgraph(&gd,&gm);
   initgraph(&gd,&gm,"bgi");

   if(abs(x2-x1)>=abs(y2-y1))
  len=abs(x2-x1);
   else
  len=abs(y2-y1);

     dx=(x2-x1)/len;
     dy=(y2-y1)/len;
     x=x1+0.5;
     y=y1+0.5;
     i=1;

     while(i<=len)
     {
  putpixel(x,y,11);
  delay(20);
  x=x+dx;
  y=y+dy;
  i=i+1;
     }

   getch();
   closegraph();
}

//-------------Bresenham Line----------
void Bresenham_Line()
{
   int gd,gm,x1,x2,y1,y2,dx,dy,e,i,x,y;
   printf("\n Enter Values as (X1,Y1) & (X2,Y2) :  ");
   scanf("%d %d %d %d",&x1,&y1,&x2,&y2);

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

   dx=abs(x2-x1);
   dy=abs(y2-y1);

   x=x1;
   y=y1;

   e=(2*dy)-dx;
   i=1;

   do
   {
  delay(40);
  putpixel(x,y,11);

  while(e>=0)
  {
      y=y+1;
      e=e-(2*dx);
  }

  x=x+1;
  e=e+2*dy;
  i++;
   }while(i<=dx);
   getch();
   closegraph();
}