新澤谷插件機XG-2000的編程裏原點OS的下壹行，又叫調整行，請問它算不算原點？個人認為不是，但

21 {

22 double sqa = a * a;

23 double sqb = b * b;

24

25 double d = sqb + sqa * (-b + 0.25);

26 int x = 0;

27 int y = b;

28 EllipsePlot(xc, yc, x, y);

29 while( sqb * (x + 1) < sqa * (y - 0.5))

30 {

31 if (d < 0)

32 {

33 d += sqb * (2 * x + 3);

34 }

35 else

36 {

37 d += (sqb * (2 * x + 3) + sqa * (-2 * y + 2));

38 y--;

39 }

40 x++;

41 EllipsePlot(xc, yc, x, y);

42 }

43 d = (b * (x + 0.5)) * 2 + (a * (y - 1)) * 2 - (a * b) * 2;

44 while(y > 0)

45 {

46 if (d < 0)

47 {

48 d += sqb * (2 * x + 2) + sqa * (-2 * y + 3);

49 x++;

50 }

51 else

52 {

53 d += sqa * (-2 * y + 3);

54 }

55 y--;

56 EllipsePlot(xc, yc, x, y);

57 }

58 }