用C#实现关联填充
要用ARX实现关联的图案填充，必须使用“永久反应器”这一技术，而C#只有“事件”（相当于ARX中的“临时反应器”），尽管填充对象(Hatch类)有一个Associative属性，但简单地设置为true，并不能解决问题。我一直觉得要用C#实现关联的图案填充必须要借助ARX的帮助，后来发现，用纯C#还是可以实现关联填充的……using System;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
namespace AssociativeHatch
{
public class Commands
{
public void AssociativeHatch()
{
Database db = HostApplicationServices.WorkingDatabase;
// 创建填充边界对象.
Line lineEnt1 = new Line(new Point3d(0, 0, 0), new Point3d(1000, 0, 0));
Line lineEnt2 = new Line(new Point3d(1000, 0, 0), new Point3d(800, 600, 0));
Line lineEnt3 = new Line(new Point3d(800, 600, 0), new Point3d(0, 0, 0));
Circle circleEnt = new Circle(new Point3d(500, 200, 0), Vector3d.ZAxis, 100);
ObjectId loopId1 = AppendEntity(lineEnt1);
ObjectId loopId2 = AppendEntity(lineEnt2);
ObjectId loopId3 = AppendEntity(lineEnt3);
ObjectId loopId4 = AppendEntity(circleEnt);
// 将填充边界对象ID添加到两个ObjectId集合中.
ObjectIdCollection loops1 = new ObjectIdCollection();
loops1.Add(loopId1);
loops1.Add(loopId2);
loops1.Add(loopId3);
ObjectIdCollection loops2 = new ObjectIdCollection();
loops2.Add(loopId4);
// 将两个ObjectId集合添加到一个ObjectId集合数组中.
ObjectIdCollection[] loops = new ObjectIdCollection;
loops.SetValue(loops1, 0);
loops.SetValue(loops2, 1);
// 填充图案对象.
Hatch hatchEnt;
ObjectId hatEntId = AddHatch(out hatchEnt, 0, "ANGLE", Math.PI / 3, 10);
// 关联填充图案与边界.
using (Transaction tr = db.TransactionManager.StartTransaction())
{
hatchEnt = (Hatch)tr.GetObject(hatEntId, OpenMode.ForWrite);
hatchEnt.Associative = true;
for (int i = 0; i < loops.Length; i++)
{
hatchEnt.AppendLoop(HatchLoopTypes.Default, loops);
}
tr.Commit();
}
}
// 由图案填充类型、填充图案名称、
// 填充角度和填充比例创建图案填充的函数.
// partType:0为预定义图案；1为用户定义图案；2为自定义图案.
private ObjectId AddHatch(out Hatch hatchEnt, HatchPatternType patType,
String patName, Double patternAngle, Double patternScale)
{
Hatch ent = new Hatch();
ent.HatchObjectType = HatchObjectType.HatchObject;
Database db = HostApplicationServices.WorkingDatabase;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
BlockTable bt = (BlockTable)trans.GetObject
(db.BlockTableId, OpenMode.ForRead);
BlockTableRecord btr = (BlockTableRecord)trans.GetObject
(bt, OpenMode.ForWrite);
ObjectId entId = btr.AppendEntity(ent);
trans.AddNewlyCreatedDBObject(ent, true);
ent.SetDatabaseDefaults();
ent.PatternAngle = patternAngle;
ent.PatternScale = patternScale;
ent.SetHatchPattern(patType, patName);
hatchEnt = ent;
trans.Commit();
return entId;
}
}
// 添加图元到数据库.
private ObjectId AppendEntity(Entity ent)
{
Database db = HostApplicationServices.WorkingDatabase;
ObjectId entId;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId,
OpenMode.ForRead);
BlockTableRecord btr = (BlockTableRecord)trans.GetObject
(bt, OpenMode.ForWrite);
entId = btr.AppendEntity(ent);
trans.AddNewlyCreatedDBObject(ent, true);
trans.Commit();
}
return entId;
}
}
}
<p><strong><font face="Verdana" color="#da2549">ahlzl</font></strong>又回来了，这下有劲了：）</p> 图案填充需要设置比例、角度、边界、关联性等参数。值得注意的是，设置这些参数的“次序”非常关键，先后次序一动，就出问题了！ <p>同感，有的时候挺恨自动桌子，总觉得他们对二次开发的态度是“管生不管养”，</p><p>DotNet这一块例子从05版到现在没看到增加几个，很多东西都要自己不断的调试</p> 是啊，现在搞那么多种开发语言，但想实现某些功能时，却经常不能单用一种语言就可以搞掂。是“管生不管养”，有始无终。 似乎这里有点变化!俺来增加人气!呵呵!
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