/// <summary>
/// Creates a <see cref="Combination"/> between the source, destination object and line.
/// </summary>
/// <param name="sourceObj"></param>
/// <param name="destinationObj"></param>
/// <param name="line"></param>
private void ConstructCombination(Shape sourceObj, Shape destinationObj, Shape line)
{
Combination combination = new Combination();
combination.Source = sourceObj;
combination.Destination = destinationObj;
combination.Line = line;
sourceObj.AddCombination(combination);
destinationObj.AddCombination(combination);
line.AddCombination(combination);
}
