/// <summary>
/// prüft, ob sich aRect und bRect echt überschneiden
/// </summary>
/// <param name="aRect">erstes Rechteck</param>
/// <param name="bRect">zweites Rechteck</param>
/// <returns></returns>
private bool IntersectsTrue(RectangleF aRect, RectangleF bRect)
{
Interval<float> aHorizontal = new Interval<float>(aRect.Left, aRect.Right);
Interval<float> aVertical = new Interval<float>(aRect.Top, aRect.Bottom);
Interval<float> bHorizontal = new Interval<float>(bRect.Left, bRect.Right);
Interval<float> bVertical = new Interval<float>(bRect.Top, bRect.Bottom);
return (aHorizontal.IntersectsTrue(bHorizontal) && aVertical.IntersectsTrue(bVertical));
}