void DrawCircle(int X, int Y, int Radius1, int Colour)
       {
        int x, y;

         for(x = 0; x < Radius1; x++)
             {
              y = ceil(sqrt(Radius1*Radius1 - x*x));
              if(X+x>=Min_X && X+x<=Max_X && Y+y>=Min_Y && Y+y<=Max_Y)
                 putpixel(X + x, Y + y, Colour);
              if(X-x>=Min_X && X-x<=Max_X && Y+y>=Min_Y && Y+y<=Max_Y)
                 putpixel(X - x, Y + y, Colour);
              if(X+x>=Min_X && X+x<=Max_X && Y-y>=Min_Y && Y-y<=Max_Y)
                putpixel(X + x, Y - y, Colour);
              if(X-x>=Min_X && X-x<=Max_X && Y-y>=Min_Y && Y-y<=Max_Y)
                putpixel(X - x, Y - y, Colour);
              }
         for(y = 0; y < Radius1; y++)
             {
              x = ceil(sqrt(Radius1*Radius1 - y*y));
              if(X+x>=Min_X && X+x<=Max_X && Y+y>=Min_Y && Y+y<=Max_Y)
                putpixel(X + x, Y + y, Colour);
              if(X-x>=Min_X && X-x<=Max_X && Y+y>=Min_Y && Y+y<=Max_Y)
                putpixel(X - x, Y + y, Colour);
              if(X+x>=Min_X && X+x<=Max_X && Y-y>=Min_Y && Y-y<=Max_Y)
                putpixel(X + x, Y - y, Colour);
              if(X-x>=Min_X && X-x<=Max_X && Y-y>=Min_Y && Y-y<=Max_Y)
                putpixel(X - x, Y - y, Colour);
              }
         }