扩展函数之图元操作
VS2008提供的扩展方法可以让我们简单的给Autodesk补漏（汗）下面是些简单的例子，注释有时间再加哈
using System.Collections;
using System.Collections.Generic;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
namespace TlsCad.ExtendMethods
{
public static class EntityEx
{
public static IEnumerable<Vertex> GetVertexs<T>(this T ent, Transaction tr) where T : Entity, IEnumerable
{
foreach (ObjectId id in ent)
{
yield return (Vertex)tr.GetObject(id, OpenMode.ForRead);
}
}
public static IEnumerable<Vertex> GetVertexs<T>(this T ent, Transaction tr, OpenMode mode) where T : Entity, IEnumerable
{
foreach (ObjectId id in ent)
{
yield return (Vertex)tr.GetObject(id, mode);
}
}
public static Extents3d GetExtents(this IEnumerable<Entity> ents)
{
Extents3d ext = new Extents3d();
foreach (Entity ent in ents)
{
ext.AddExtents(ent.GeometricExtents);
}
return ext;
}
public static void Move(this Entity ent, Point3d from, Point3d to)
{
ent.TransformBy(Matrix3d.Displacement(to - from));
}
public static void Rotation(this Entity ent, Point3d center, double angle, Vector3d normal)
{
ent.TransformBy(Matrix3d.Rotation(angle, normal, center));
}
public static void Rotation(this Entity ent, Point3d center, double angle)
{
ent.TransformBy(Matrix3d.Rotation(angle, Vector3d.ZAxis.TransformBy(ent.Ecs) , center));
}
public static void Mirror(this Entity ent, Point3d pt1, Point3d pt2)
{
ent.TransformBy(Matrix3d.Mirroring(new Line3d(pt1, pt2)));
}
public static void Mirror(this Entity ent, Plane plane)
{
ent.TransformBy(Matrix3d.Mirroring(plane));
}
public static void Mirror(this Entity ent, Point3d ptBase)
{
ent.TransformBy(Matrix3d.Mirroring(ptBase));
}
public static void ValidateMirror(this DBText txt)
{
if (!txt.Database.Mirrtext)
{
txt.IsMirroredInX = false;
txt.IsMirroredInY = false;
}
}
}
}
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