void draw(Graphics2D g) {
if (this == selected) {
g.setColor(selectedColor);
fillCircle(g, screenPos);
g.setColor(color);
} else drawCircle(g, screenPos);
// drawText(g, screenPos, id);
}
private void fillCircle(Graphics2D g, Point2D loc) {
int x = (int) (loc.getX() - circleRadius);
int y = (int) (loc.getY() - circleRadius);
g.fillOval(x, y, 2 * circleRadius, 2 * circleRadius);
}