Hello everyone,
please hel me with a problem.Is there a way to make a outline in C# or VB.net for some closed polyline .Something like in this picture :
Thank you for your support and your help.
Outline closed Polylines in Autocad.net
Accepted solution
Hi,
You can use the following method and struct (which is a generalization of this one).
struct Segment
{
public Point2d StartPt { get; set; }
public Point2d EndPt { get; set; }
public double Bulge { get; set; }
}
public static IEnumerable<Polyline> Union(IEnumerable<Polyline> plines)
{
foreach (var group in plines.GroupBy(pl => new { pl.Elevation, pl.Normal }))
{
if (group.Count() == 1)
{
yield return group.First();
}
else
{
var plane = new Plane(Point3d.Origin, group.Key.Normal);
var segs = new List<Segment>();
using (var dbObjects = new DBObjectCollection())
{
foreach (var pline in group)
{
pline.Explode(dbObjects);
}
using (DBObjectCollection regions = Region.CreateFromCurves(dbObjects))
{
var region = (Region)regions[0];
for (int i = 1; i < regions.Count; i++)
{
region.BooleanOperation(BooleanOperationType.BoolUnite, (Region)regions[i]);
regions[i].Dispose();
}
foreach (DBObject o in dbObjects) o.Dispose();
dbObjects.Clear();
region.Explode(dbObjects);
region.Dispose();
for (int i = 0; i < dbObjects.Count; i++)
{
if (dbObjects[i] is Region)
{
((Region)dbObjects[i]).Explode(dbObjects);
continue;
}
var curve = (Curve)dbObjects[i];
Point3d start = curve.StartPoint;
Point3d end = curve.EndPoint;
double bulge = 0.0;
if (curve is Arc)
{
Arc arc = (Arc)curve;
double angle = arc.Center.GetVectorTo(start).GetAngleTo(arc.Center.GetVectorTo(end), arc.Normal);
bulge = Math.Tan(angle / 4.0);
}
segs.Add(new Segment { StartPt = start.Convert2d(plane), EndPt = end.Convert2d(plane), Bulge = bulge });
}
foreach (DBObject obj in dbObjects) obj.Dispose();
while (segs.Count > 0)
{
using (Polyline pline = new Polyline())
{
pline.AddVertexAt(0, segs[0].StartPt, segs[0].Bulge, 0.0, 0.0);
Point2d pt = segs[0].EndPt;
segs.RemoveAt(0);
int vtx = 1;
while (true)
{
int i = segs.FindIndex(delegate (Segment s)
{
return s.StartPt.IsEqualTo(pt) || s.EndPt.IsEqualTo(pt);
});
if (i < 0) break;
Segment seg = segs[i];
if (seg.EndPt.IsEqualTo(pt))
seg = new Segment { StartPt = seg.EndPt, EndPt = seg.StartPt, Bulge = -seg.Bulge };
pline.AddVertexAt(vtx, seg.StartPt, seg.Bulge, 0.0, 0.0);
pt = seg.EndPt;
segs.RemoveAt(i);
vtx++;
}
pline.Closed = true;
pline.Normal = group.Key.Normal;
pline.Elevation = group.Key.Elevation;
yield return pline;
}
}
}
}
}
}
}
Thankyou so much Sir for your help.Your code work so greate.Here is a picture of some polylines .After apply the code it creates a single polyline .Have a nice day 🙂
@anhtuan891997 a écrit :
Hello! Can you show the entire code to create an outline like your image?
Here's an example:
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using System;
using System.Collections.Generic;
using System.Linq;
using AcAp = Autodesk.AutoCAD.ApplicationServices.Core.Application;
namespace UnionPlinesSample
{
public class Commands
{
[CommandMethod("TEST")]
public static void Test()
{
var doc = AcAp.DocumentManager.MdiActiveDocument;
var db = doc.Database;
var ed = doc.Editor;
var filter = new SelectionFilter(new[] {
new TypedValue(0, "LWPOLYLINE"),
new TypedValue(-4, "&"),
new TypedValue(70, 1) });
var selection = ed.GetSelection(filter);
if (selection.Status == PromptStatus.OK)
{
var options = new PromptKeywordOptions("\nErase source polylines [Yes/No]", "Yes No");
var kWord = ed.GetKeywords(options);
if (kWord.Status == PromptStatus.OK)
{
using (var tr = db.TransactionManager.StartOpenCloseTransaction())
{
var source = selection.Value
.GetObjectIds()
.Select(id => (Polyline)tr.GetObject(id, OpenMode.ForRead));
var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
foreach (var pline in Union(source))
{
curSpace.AppendEntity(pline);
tr.AddNewlyCreatedDBObject(pline, true);
}
if (kWord.StringResult == "Yes")
{
foreach (var pline in source)
{
pline.UpgradeOpen();
pline.Erase();
}
}
tr.Commit();
}
}
}
}
struct Segment
{
public Point2d StartPt { get; set; }
public Point2d EndPt { get; set; }
public double Bulge { get; set; }
}
public static IEnumerable<Polyline> Union(IEnumerable<Polyline> plines)
{
foreach (var group in plines.GroupBy(pl => new { pl.Elevation, pl.Normal }))
{
if (group.Count() == 1)
{
yield return group.First();
}
else
{
var plane = new Plane(Point3d.Origin, group.Key.Normal);
var segs = new List<Segment>();
using (var dbObjects = new DBObjectCollection())
{
foreach (var pline in group)
{
pline.Explode(dbObjects);
}
using (DBObjectCollection regions = Region.CreateFromCurves(dbObjects))
{
var region = (Region)regions[0];
for (int i = 1; i < regions.Count; i++)
{
region.BooleanOperation(BooleanOperationType.BoolUnite, (Region)regions[i]);
regions[i].Dispose();
}
foreach (DBObject o in dbObjects) o.Dispose();
dbObjects.Clear();
region.Explode(dbObjects);
region.Dispose();
for (int i = 0; i < dbObjects.Count; i++)
{
if (dbObjects[i] is Region)
{
((Region)dbObjects[i]).Explode(dbObjects);
continue;
}
var curve = (Curve)dbObjects[i];
Point3d start = curve.StartPoint;
Point3d end = curve.EndPoint;
double bulge = 0.0;
if (curve is Arc)
{
Arc arc = (Arc)curve;
double angle = arc.Center.GetVectorTo(start).GetAngleTo(arc.Center.GetVectorTo(end), arc.Normal);
bulge = Math.Tan(angle / 4.0);
}
segs.Add(new Segment { StartPt = start.Convert2d(plane), EndPt = end.Convert2d(plane), Bulge = bulge });
}
foreach (DBObject obj in dbObjects) obj.Dispose();
while (segs.Count > 0)
{
using (Polyline pline = new Polyline())
{
pline.AddVertexAt(0, segs[0].StartPt, segs[0].Bulge, 0.0, 0.0);
Point2d pt = segs[0].EndPt;
segs.RemoveAt(0);
int vtx = 1;
while (true)
{
int i = segs.FindIndex(delegate (Segment s)
{
return s.StartPt.IsEqualTo(pt) || s.EndPt.IsEqualTo(pt);
});
if (i < 0) break;
Segment seg = segs[i];
if (seg.EndPt.IsEqualTo(pt))
seg = new Segment { StartPt = seg.EndPt, EndPt = seg.StartPt, Bulge = -seg.Bulge };
pline.AddVertexAt(vtx, seg.StartPt, seg.Bulge, 0.0, 0.0);
pt = seg.EndPt;
segs.RemoveAt(i);
vtx++;
}
pline.Closed = true;
pline.Normal = group.Key.Normal;
pline.Elevation = group.Key.Elevation;
yield return pline;
}
}
}
}
}
}
}
}
}
Can you please use the code formatting feature !
public void make_buffer(Polyline3d poly, double buffer, string detination_layer)
{ // . . . }
Click the button.
A dialog opens .
Add the code ( paste ) into the dialog.
Regards,
