C Program For Mid Point Circle Algorithm

Source Code:

 #include<stdio.h>
 #include<stdlib.h>
 #include<graphics.h>
 #include<conio.h>
 #include<math.h>


-----------------------  Function Prototypes  -------------------------

 void show_screen( );

 void midpoint_circle(const int,const int,const int);

------------------------------  main( )  ------------------------------

 int main( )
    {
       int driver=VGA;
       int mode=VGAHI;

       int h=0;
       int k=0;
       int r=0;
       clrscr();
       do
	  {
	     show_screen( );

	     gotoxy(8,10);
	     printf("Central Point of the Circle : (h,k) :");

	     gotoxy(8,11);
	     printf("ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ");

	     gotoxy(12,13);
	     printf("Enter the value of h = ");
	     scanf("%d", &h);

	     gotoxy(12,14);
	     printf("Enter the value of k = ");
	     scanf("%d", &k);

	     gotoxy(8,18);
	     printf("Radius of the Circle : r :");

	     gotoxy(8,19);
	     printf("ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ");

	     gotoxy(12,21);
	     printf("Enter the value of r = ");
	     scanf("%d", &r);

	     initgraph(&driver,&mode,"c:/tc/bgi");

	     setcolor(15);
	       midpoint_circle(h,k,r);

	     setcolor(15);
	       outtextxy(110,460,"Press  to continue or any other key to exit.");

	     int key=int(getch( ));

	     if(key!=13)
		break;
	  }
       while(1);

       return 0;
    }

------------------------  Funcion Definitions  ------------------------

-----------------------  midpoint_circle( )  --------------------------


 void midpoint_circle(const int h,const int k,const int r)
    {
       int color=getcolor( );

       int x=0;
       int y=r;
       int p=(1-r);

       do
	  {
	     putpixel((h+x),(k+y),color);
	     putpixel((h+y),(k+x),color);
	     putpixel((h+y),(k-x),color);
	     putpixel((h+x),(k-y),color);
	     putpixel((h-x),(k-y),color);
	     putpixel((h-y),(k-x),color);
	     putpixel((h-y),(k+x),color);
	     putpixel((h-x),(k+y),color);

	     x++;

	     if(p<0)
		p+=((2*x)+1);

	     else
		{
		   y--;
		   p+=((2*(x-y))+1);
		}
	  }
       while(x<=y);
    }

 --------------------------  show_screen( )  --------------------------


 void show_screen( )
    {
       restorecrtmode( );
       textmode(C4350);

       textbackground(1);
       cprintf(" MidPoint Circle Algorithm ");
       textbackground(8);
       for(int count=0;count<42;count++)

       gotoxy(1,46);

       gotoxy(1,2);
    }