public static float CalculateIntersectPercentage(RectangleF rect, RectangleF referenceRect)
{
if (rect.IsEmpty || referenceRect.IsEmpty) return 0;
referenceRect.Intersect(rect); // replace referenceRect with intersect
return referenceRect.IsEmpty ? 0 : (referenceRect.Width * referenceRect.Height) / (rect.Width * rect.Height);
}