/// <summary>
/// Verify that the bounds are sorted.
/// </summary>
/// <returns></returns>
public bool IsValid()
{
var d = UpperBound - LowerBound;
var valid = d.X >= 0.0f && d.Y >= 0.0f;
valid = valid && LowerBound.IsValid() && UpperBound.IsValid();
return(valid);
}
