gtk/level_bar.go
func LevelBarNewForInterval(min_value, max_value float64) (*LevelBar, error) {
	c := C.gtk_level_bar_new_for_interval(C.gdouble(min_value), C.gdouble(max_value))
	if c == nil {
		return nil, nilPtrErr
	}
	return wrapLevelBar(glib.Take(unsafe.Pointer(c))), nil
}
func LevelBarNewForInterval(min_value, max_value float64) (*LevelBar, error) {
	c := C.gtk_level_bar_new_for_interval(C.gdouble(min_value), C.gdouble(max_value))
	if c == nil {
		return nil, nilPtrErr
	}
	return wrapLevelBar(glib.Take(unsafe.Pointer(c))), nil
}
// LevelBarNewForInterval() is a wrapper around gtk_level_bar_new_for_interval().