bool Calculate()
{
// Ensure any previously defined end positions have been turfed.
m_South = null;
m_North = null;
// Can't do nothing if the reference line is undefined.
if (m_Line == null)
{
return(false);
}
// Calculate the parallel points, depending on what sort of
// observation we've got.
IPosition north = null;
IPosition south = null;
bool ok = false;
// Ensure the correct sign is defined in case of an offset distance.
if (m_Offset != null)
{
if (m_IsLeft)
{
m_Offset.SetNegative();
}
else
{
m_Offset.SetPositive();
}
ok = ParallelLineUI.Calculate(m_Line, m_Offset, out south, out north);
}
else if (m_Point != null)
{
ok = ParallelLineUI.Calculate(m_Line, m_Point, out south, out north);
}
// If the calculation succeeded, allocate vertices to
// hold the results we got.
if (ok)
{
m_South = south;
m_North = north;
}
return(ok);
}
/// <summary>
/// Calculates the terminal positions for the parallel.
/// </summary>
/// <param name="refLine">The reference line.</param>
/// <param name="offset">The observed offset (either a <c>Distance</c>
/// or an <c>OffsetPoint</c>).</param>
/// <param name="term1">A line that the parallel should start on (may be null).</param>
/// <param name="term2">A line that the parallel should end on (may be null).</param>
/// <param name="spar">The start of the parallel.</param>
/// <param name="epar">The end of the parallel.</param>
/// <returns>True if calculated ok.</returns>
bool Calculate(LineFeature refLine
, Observation offset
, LineFeature term1
, LineFeature term2
, out IPosition spar
, out IPosition epar)
{
spar = epar = null;
if (!ParallelLineUI.Calculate(refLine, offset, out spar, out epar))
{
return(false);
}
// If the start of the parallel should begin on a specific
// line, get the closest intersection.
if (term1 != null)
{
spar = ParallelLineUI.GetIntersect(refLine, spar, term1);
if (spar == null)
{
throw new Exception("Parallel does not intersect terminal line.");
}
}
// And similarly for the end of the parallel.
if (term2 != null)
{
IPosition tpar = ParallelLineUI.GetIntersect(refLine, epar, term2);
if (tpar == null)
//epar = ParallelLineUI.GetIntersect(refLine, epar, term2);
//if (epar == null)
{
epar = ParallelLineUI.GetIntersect(refLine, epar, term2);
throw new Exception("Parallel does not intersect terminal line.");
}
else
{
epar = tpar;
}
}
return(true);
}
