/// <summary>
/// Adds a termination point (or re-use a point if it happens to be the offset point).
/// </summary>
/// <param name="loc">The location for the termination point.</param>
/// <returns>The point feature at the termination point (may be the position that was
/// used to define the offset to the parallel line).</returns>
PointFeature AddPoint(IPosition loc)
{
CadastralMapModel map = CadastralMapModel.Current;
// Add the split point (with default entity type). If a
// point already exists at the location, you'll get back
// that point instead.
// We do this in case the user has decided to
// terminate on a line connected to the offset point
// that defines the offset to the parallel (which the
// UI lets the user do).
PointFeature p = this.OffsetPoint;
if (p != null)
{
IPointGeometry pg = PointGeometry.Create(loc);
if (p.IsCoincident(pg))
{
return(p);
}
}
p = map.AddPoint(p, map.DefaultPointType, this);
p.SetNextId();
return(p);
}
/// <summary>
/// Does a position coincide with a point feature that was used to define the
/// offset to the parallel line?
/// </summary>
/// <param name="loc">The test position</param>
/// <returns>True if the offset was defined using a point feature (as opposed to an
/// explicit distance), and the supplied position is exactly coincident.</returns>
bool IsPositionAtOffsetPoint(IPosition loc)
{
PointFeature p = this.OffsetPoint;
if (p == null)
{
return(false);
}
IPointGeometry pg = PointGeometry.Create(loc);
return(p.IsCoincident(pg));
}
/// <summary>
/// Appends a point to the new line. If it's the second point, the new line
/// will be added to the map.
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
internal virtual bool AppendToLine(PointFeature p)
{
// If the start point is not defined, just remember it.
if (m_Start == null)
{
m_Start = p;
return(true);
}
// Confirm the point is different from the start.
if (p.IsCoincident(m_Start))
{
MessageBox.Show("End point cannot match the start point.");
return(false);
}
// Add the new line.
AddNewLine(p);
DialFinish(null);
return(true);
}
/// <summary>
/// Appends a point to the new line. If it's the second point, the new line
/// will be added to the map.
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
internal virtual bool AppendToLine(PointFeature p)
{
// If the start point is not defined, just remember it.
if (m_Start==null)
{
m_Start = p;
return true;
}
// Confirm the point is different from the start.
if (p.IsCoincident(m_Start))
{
MessageBox.Show("End point cannot match the start point.");
return false;
}
// Add the new line.
AddNewLine(p);
DialFinish(null);
return true;
}
