#include <conio.h>
#include <stdlib.h>

//############################ Вывод точки ##################################
void putpixel(unsigned int X,unsigned int Y,unsigned char Color)
 {
  asm {
        mov     ax, [Y]
        mov     dx, 320
        imul    dx
        add     ax, [X]
        mov     di, ax
        push    es
        mov     ax, 0xA000
        mov     es, ax
        mov     al,[Color]
        stosb
        pop     es
      }
 }

//################ Алгорит Брезенхема для рисования эллипса #################
void ellipse(int x, int y, int a, int b, int color)
{
 int col,i,row,bnew;
 long a_square,b_square,two_a_square,two_b_square,four_a_square,four_b_square,d;

  b_square=b*b;
  a_square=a*a;
  row=b;
  col=0;
  two_a_square=a_square<<1;
  four_a_square=a_square<<2;
  four_b_square=b_square<<2;
  two_b_square=b_square<<1;
  d=two_a_square*((row-1)*(row))+a_square+two_b_square*(1-a_square);
  while(a_square*(row)>b_square*(col))
  {
   putpixel(col+x,row+y,color);
   putpixel(col+x,y-row,color);
   putpixel(x-col,row+y,color);
   putpixel(x-col,y-row,color);
   if (d>=0)
   {
    row--;
    d-=four_a_square*(row);
   }
   d+=two_b_square*(3+(col<<1));
   col++;
  }
  d=two_b_square*(col+1)*col+two_a_square*(row*(row-2)+1)+(1-two_a_square)*b_square;
  while ((row) + 1)
  {
   putpixel(col+x,row+y,color);
   putpixel(col+x,y-row,color);
   putpixel(x-col,row+y,color);
   putpixel(x-col,y-row,color);
   if (d<=0)
   {
    col++;
    d+=four_b_square*col;
   }
   row--;
   d+=two_a_square*(3-(row <<1));
  }
 }

void main(void)
 {
 int X,Y;

 asm mov    ax,0x0013
 asm int    0x10
 while (!kbhit()) putpixel(random(320),random(200),random(255));
 getch();
 while (!kbhit())
  {
    X=50+random(220);
    Y=50+random(100);
    ellipse(X,Y,1+random(48),1+random(48),random(255));
  }
 getch();
 }