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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.Windows;
using Autodesk.AutoCAD.Geometry;
namespace AcadDemo
{
public class PerimeterOfHatch
{
[CommandMethod("HatchPerimeterTest")]
public void HatchPerimeterTest()
{
Document activeDoc= Application.DocumentManager.MdiActiveDocument;
Editor ed = activeDoc.Editor;
PromptEntityOptions peo= new PromptEntityOptions("Select a hatch : ");
peo.SetRejectMessage("\nPlease select a hatch");
peo.AddAllowedClass(typeof(Hatch), true);
PromptEntityResult per = ed.GetEntity(peo);
if (per.Status != PromptStatus.OK)
return;
HatchPerimeter(per.ObjectId);
}
void HatchPerimeter(ObjectId entId)
{
Document activeDoc = Application.DocumentManager.MdiActiveDocument;
Database db = activeDoc.Database;
Editor ed = activeDoc.Editor;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
Hatch hatch = tr.GetObject(entId, OpenMode.ForRead) as Hatch;
int nLoops = hatch.NumberOfLoops;
double totalExternalPerimeter = 0.0;
double totalInternalPerimeter = 0.0;
for (int i = 0; i < nLoops; i++)
{
double loopLength = 0.0;
HatchLoopTypes hlt = hatch.LoopTypeAt(i);
HatchLoop hatchLoop = hatch.GetLoopAt(i);
if ((hatch.LoopTypeAt(i) & HatchLoopTypes.Polyline)== HatchLoopTypes.Polyline)
{
BulgeVertexCollection bulges= hatchLoop.Polyline;
int nVertices = bulges.Count;
Polyline testPoly = new Polyline(nVertices);
for (int vx = 0; vx < bulges.Count; vx++)
{
BulgeVertex bv = bulges[vx];
testPoly.AddVertexAt(vx,bv.Vertex,bv.Bulge,1.0,1.0);
}
LineSegment3d ls = new LineSegment3d();
CircularArc3d cs = new CircularArc3d();
double d = 0.0, p1 = 0.0, p2 = 1.0;
for (int ver = 0; ver < nVertices - 1; ver++)
{
d = testPoly.GetBulgeAt(ver);
if (d <= 1e-5)
{
ls = testPoly.GetLineSegmentAt(ver);
loopLength += ls.Length;
}
else
{
Point2d v1= new Point2d(bulges[ver].Vertex.X,bulges[ver].Vertex.Y);
Point2d v2= new Point2d(bulges[ver + 1].Vertex.X,bulges[ver + 1].Vertex.Y);
if (v1.IsEqualTo(v2) == false)
{
cs = testPoly.GetArcSegmentAt(ver);
p1 = cs.GetParameterOf(cs.StartPoint);
p2 = cs.GetParameterOf(cs.EndPoint);
loopLength +=cs.GetLength
(p1,p2,Tolerance.Global.EqualPoint);
}
}
}
}
else
{
Curve2dCollection curves = hatchLoop.Curves;
if (curves != null)
{
foreach (Curve2d curve in curves)
{
if (hatchLoop.LoopType== HatchLoopTypes.External)
{
totalExternalPerimeter +=curve.GetLength(0.0, 1.0);
}
else
{
totalInternalPerimeter +=curve.GetLength(0.0, 1.0);
}
}
}
}
if (nLoops > 1 &&
((hlt & HatchLoopTypes.External) != HatchLoopTypes.External))
{
totalInternalPerimeter += loopLength;
}
else
{
totalExternalPerimeter += loopLength;
}
}
ed.WriteMessage(string.Format("\nExternal Perimeter : {0}",totalExternalPerimeter));
ed.WriteMessage(string.Format("\nInternal Perimeter : {0}",totalInternalPerimeter));
tr.Commit();
}
}
}
}
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