IntersectWith用来寻找两个实体的交点
public unsafe void IntersectWith(
Entity entityPointer,
Intersect intersectType,
Point3dCollection points,
IntPtr thisGraphicSystemMarker,
IntPtr otherGraphicSystemMarker)
此函数应用于两个Entity的简单相交，返回值为Entity的的点集
entityPointer：相交的另一个Entity
-
intersectType：计算交点的方式
namespace Autodesk.AutoCAD.DatabaseServices { [Wrapper("AcDb::Intersect")] public enum Intersect { OnBothOperands, ExtendThis, ExtendArgument, ExtendBoth, } }- Intersect.OnBothOperands ：实际交点
- Intersect.ExtendThis ： 延长IntersectWith之前的Entity
- Intersect.ExtendArgument : 延长entityPointer
- Intersect.ExtendBoth : 两个都延长
points ： 点集
thisGraphicSystemMarker ：下级实体的图形系统标记，如果不适用就用缺省值IntPtr.Zero
otherGraphicSystemMarker ：下级实体的图形系统标记，如果不适用就用缺省值IntPtr.Zero
示例程序
public static void IntersectWithTest () {
Database db = HostApplicationServices.WorkingDatabase;
Editor editor = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
Line line1 = new Line();
line1.StartPoint = new Point3d(0, 0, 0);
line1.EndPoint = new Point3d(0, 100, 0);
Circle circle = new Circle();
circle.Center = new Point3d(0, 0, 0);
circle.Radius = 80;
//放交点的集合
Point3dCollection intersectionPoints1 = new Point3dCollection();
line1.IntersectWith(circle, Intersect.OnBothOperands, intersectionPoints1, IntPtr.Zero,IntPtr.Zero);
//intersectionPoints1 中有一个点 (0, 80, 0)
Point3dCollection intersectionPoints2 = new Point3dCollection();
circle.IntersectWith(line1, Intersect.OnBothOperands, intersectionPoints2, IntPtr.Zero, IntPtr.Zero);
//intersectionPoints2 中有一个点 (0, 80, 0)
Point3dCollection intersectionPoints3 = new Point3dCollection();
line1.IntersectWith(circle, Intersect.ExtendThis, intersectionPoints3, IntPtr.Zero,IntPtr.Zero);
//intersectionPoints3 中有两个点 (0, 80, 0)(0, -80, 0)
Point3dCollection intersectionPoints4 = new Point3dCollection();
circle.IntersectWith(line1, Intersect.ExtendThis, intersectionPoints4, IntPtr.Zero, IntPtr.Zero);
//intersectionPoints4 中有一个点 (0, 80, 0)
Point3dCollection intersectionPoints5 = new Point3dCollection();
line1.IntersectWith(circle, Intersect.ExtendArgument, intersectionPoints5, IntPtr.Zero, IntPtr.Zero);
//intersectionPoints5 中有一个点 (0, 80, 0)
Point3dCollection intersectionPoints6 = new Point3dCollection();
circle.IntersectWith(line1, Intersect.ExtendArgument, intersectionPoints6, IntPtr.Zero, IntPtr.Zero);
//intersectionPoints6 中有两个点 (0, 80, 0)(0, -80, 0)
Point3dCollection intersectionPoints7 = new Point3dCollection();
line1.IntersectWith(circle, Intersect.ExtendBoth, intersectionPoints7, IntPtr.Zero, IntPtr.Zero);
//intersectionPoints7 中有两个点 (0, 80, 0)(0, -80, 0)
Point3dCollection intersectionPoints8 = new Point3dCollection();
circle.IntersectWith(line1, Intersect.ExtendBoth, intersectionPoints8, IntPtr.Zero, IntPtr.Zero);
//intersectionPoints8 中有两个点 (0, 80, 0)(0, -80, 0)
}
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