Accepted solution
Here's some code using the TransientGraphics that will highlight the selected Alignment.SubEntity. I only show Lines and Arcs since I don't use Spirals here.
In an Extension method class, which has in the usings "using aGi = Autodesk.AutoCAD.GraphicsInterface;" :
public static void Highlight(this Alignment align, Point3d pt)
{
ClearMarkers();
AlignmentSubEntity subEnt = align.SelectedSubEnt(pt);
switch (subEnt.SubEntityType)
{
case AlignmentSubEntityType.Arc:
HighlightArc((AlignmentSubEntityArc)subEnt);
break;
case AlignmentSubEntityType.Line:
HighlightLine((AlignmentSubEntityLine)subEnt);
break;
case AlignmentSubEntityType.Spiral:
//ToDo: Add code for the Spiral type
break;
}
}
public static Point3d To3D(this Point2d pt)
{
return new Point3d(pt.X, pt.Y, 0);
}
private static void HighlightLine(AlignmentSubEntityLine ent)
{
Line line = new Line(ent.StartPoint.To3D(), ent.EndPoint.To3D());
line.ColorIndex = 1; //may want to get the actual display color for the Alignment's style...more work :-)
aGi.TransientManager.CurrentTransientManager.AddTransient(line, aGi.TransientDrawingMode.Highlight, 128, intColl);
m_mrkers.Add(line);
}
private static void HighlightArc(AlignmentSubEntityArc subEnt)
{
Vector2d startAng = new Vector2d();
Vector2d endAng = new Vector2d();
if(subEnt.Clockwise)
{
startAng = subEnt.CenterPoint.GetVectorTo(subEnt.EndPoint);
endAng = subEnt.CenterPoint.GetVectorTo(subEnt.StartPoint);
}
else
{
startAng = subEnt.CenterPoint.GetVectorTo(subEnt.StartPoint);
endAng = subEnt.CenterPoint.GetVectorTo(subEnt.EndPoint);
}
Arc arc = new Arc(subEnt.CenterPoint.To3D(), subEnt.Radius, startAng.Angle, endAng.Angle);
arc.ColorIndex = 2; //may want to get the actual display color for the Alignment's style...more work :-)
aGi.TransientManager.CurrentTransientManager.AddTransient(arc, aGi.TransientDrawingMode.Highlight, 128, intColl);
m_mrkers.Add(arc);
}
public static void ClearMarkers()
{
for (int i = 0; i < m_mrkers.Count; i++)
{
aGi.TransientManager.CurrentTransientManager.EraseTransient(m_mrkers[i], intColl);
m_mrkers[i].Dispose();
}
m_mrkers.Clear();
}
public static AlignmentSubEntity SelectedSubEnt(this Alignment align, Point3d pt)
{
AlignmentSubEntity ent = null;
double station = double.NaN, offset = double.NaN;
try
{
align.StationOffset(pt.X, pt.Y, ref station, ref offset);
}
catch
{
return ent;
}
foreach (AlignmentEntity e in align.Entities)
{
for (int i = 0; i < e.SubEntityCount; i++)
{
AlignmentSubEntity subent = e[i];
if (subent.StartStation < station && subent.EndStation > station)
{
ent= subent;
break;
}
}
if (ent != null)
break;
}
return ent;
}
And the Command to test it:
[CommandMethod("HighliteAlignEnt")]
public void hilite()
{
var doc = Application.DocumentManager.MdiActiveDocument;
var ed = doc.Editor;
var db = doc.Database;
var entOpts = new PromptEntityOptions("\nSelect an alignment to offset:");
entOpts.SetRejectMessage("...not an alignment, try again!");
entOpts.AddAllowedClass(typeof(Alignment), true);
var entSel = ed.GetEntity(entOpts);
if (entSel.Status != PromptStatus.OK)
return;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
var align = (Alignment)tr.GetObject(entSel.ObjectId, OpenMode.ForRead);
align.Highlight(entSel.PickedPoint);
align.Unhighlight();
}
}
[CommandMethod("UnHighliteAlignEnt")]
public void unhilite()
{
Extensions.AlignmentExtensions.ClearMarkers();
}
Hope that helps.
