Ellipses not being created (MFD)

The quarter circle on the picture consists of 90 small ellipses that should create a full circle. However, once one of the values is a negative number, it doesn't even create the ellipse anymore. The values are calculated correctly (the vector on the top of the picture), and if I manually enter the values the vizzy calculated, it also works.

The values are calculated using the pythagorean theorem. I set a variable (xPosition) to round(sin(deg2rad(90 - direction)) * (dist / (range / 200))) and another variable (yPosition) to round(sin(deg2rad(direction)) * (dist / (range / 200))). Direction is the direction (in degrees) the line points to, dist is currently set to 450, range is currently set to 1000. Then, I set a third variable to vec(xPosition, yPosition, 0). This variable is the position on the MFD.

Example: Direction - 100

xPosition:
round(sin(deg2rad(90 - 100)) * (450 / (1000 / 200))
= round(-0.17 * (450 / 5))
= round(-0.17 * 90)
= round(-15.3)
= -15

yPosition:
round(sin(deg2rad(100)) * (450 / (1000 / 200))
= round(0.98 * (450 / 5))
= round(0.98 * 90)
= round(88.2)
= 88

Position:
vec(-15, 88, 0)