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Dieses Beispiel

zeigt wie Drawing3d die Punkte fangt. Für jeden Drawbefehl wird ein Snappitem erzeugt und in die Liste Snappitems von OpenGlDevice gestellt, wenn der Mauszeiger sich über dem Gezeichneten befindet. Dabei ist der Magenetismus auf eine Linie größer als auf eine Fläche, auf einen Punkt größer als auf einen Punkt. Der ActiveCursor zeigt als roter Cursor die Position. Sie wird erhalten -im Fall SnappItems.Count > 0 aus SnappItems[0].Point- Device.Currentxyz sonst.
Folgende Snappitems gibt es:
SurfaceSnapItem,
LineSnapItem,
PointSnapItem,
CurveSnapItem,
PolyCurveSnapItem,
PolyPolyCurveSnapItem,
TextSnapItem,
MeshSnapItem,
PolyLineSnapItem,
CurveSnapItem3D,
PolyLineSnapItem3D,
PolyPolyLineSnapItem3D,
PolyPolyLineSnapItem,
SphereSnapItem,
BoxSnapItem,

Sie können mit der Combobox ausgewält werden.
using System;
using System.Drawing;
using System.Windows.Forms;
using Drawing3d;
namespace Snapdocu
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Device.WinControl = this;
            comboBox1.SelectedIndex = 0;
        }
        public MyOpenGl Device = new MyOpenGl();
       private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            Device.ActiveSnapKind = (MyOpenGl.Snapkind)comboBox1.SelectedIndex;
            Device.Selector.RefreshSnapBuffer();
        }
    }
    public class MyOpenGl:OpenGlDevice
    {
       public enum Snapkind
        {
            SurfaceSnapItem,
            LineSnapItem,
            PointSnapItem,
            CurveSnapItem,
            PolyCurveSnapItem,
            PolyPolyCurveSnapItem,
            TextSnapItem,
            MeshSnapItem,
            PolyLineSnapItem,
            CurveSnapItem3D,
            PolyLineSnapItem3D,
            PolyPolyLineSnapItem3D,
            PolyPolyLineSnapItem,
            SphereSnapItem,
            BoxSnapItem,
           
        };
       public Snapkind ActiveSnapKind = Snapkind.MeshSnapItem;
        ActiveCursor ACursor = new ActiveCursor();
       
        Drawing3d.Font Font = new Drawing3d.Font("Arial");
       
        protected override void OnCreated()
        {
            Lights[0].Position = new xyzwf(16, 5, 10, 1);
 
           
            ACursor.xAxisColor = Color.Red;
            ACursor.zAxisColor = Color.Green;
            ACursor.zAxisColor = Color.Blue;
            ACursor.PenWidth = 3;
            base.OnCreated();
        }
        public override void OnPaint()
        {
            BackColor = Color.White;
        
            switch (ActiveSnapKind)
            {
                case Snapkind.SurfaceSnapItem:

                    CurveExtruder CurveEx = new CurveExtruder();
                    CurveEx.Direction = new xyz(0,1, 1);
                     CurveEx.Height = -1;
                     CurveEx.Curve = new Bezier(new xy(9, 0), new xy(6, 3), new xy(3, 3), new xy(0, 0));
                    CurveEx.DownPlane = new Plane(new xyz(0, 0, 0), new xyz(0, 0, 1));
                    CurveEx.UpPlane = new Plane(new xyz(0, 0, 0) + CurveEx.Direction * 7, CurveEx.Direction);
                   
                    CurveEx.Paint(this);
                    break;
                case Snapkind.LineSnapItem:
                   
                    drawCurve(new Line(new xy(0, 0), new xy(10, 0)));
                    break;
                case Snapkind.PointSnapItem:
                    drawPoint(new xyz(4, 3, 0), 0.2);

                    break;
                case Snapkind.CurveSnapItem:
                    Curve C = new Bezier(new xy(9, 0), new xy(6, 3), new xy(3, 3), new xy(0, 0));
                    PolygonMode = PolygonMode.Line;
                    Emission = Color.Black;
                    PenWidth = 3;
                    drawCurve(C);
                    PolygonMode = PolygonMode.Fill;
                    break;
                case Snapkind.PolyCurveSnapItem:

                    Lights[0].Position = new xyzwf(-10, -10, 10, 1);
                    CurveArray _Curves0 = new CurveArray();
                    PolygonMode = PolygonMode.Line;
                    _Curves0.Count = 4;
                    _Curves0[0] = new Line(new xy(-3, -3), new xy(-3, 4));
                    _Curves0[1] = new Line(new xy(-3, 4), new xy(4, 4));
                    _Curves0[2] = new Line(new xy(4, 4), new xy(4, -3));
                    _Curves0[3] = new Bezier(new xy(4, -3), new xy(3, -3.5), new xy(1, -3.5), new xy(-3, -3));
                   
                    drawPolyCurve(_Curves0);

                    PolygonMode = PolygonMode.Fill;
                   break;
                case Snapkind.PolyPolyCurveSnapItem:
                    Loca _Loca = new Loca();
                    CurveArray Curves0 = new CurveArray();
                    Curves0.Count = 4;
                    Curves0[0] = new Line(new xy(-3, -3), new xy(-3, 4));
                    Curves0[1] = new Line(new xy(-3, 4), new xy(4, 4));
                    Curves0[2] = new Line(new xy(4, 4), new xy(4, -3));
                    Curves0[3] = new Bezier(new xy(4, -3), new xy(3, -3.5), new xy(1, -3.5), new xy(-3, -3));
                   _Loca.Add(Curves0);
                    OpenGlDevice.CheckError();
                    CurveArray Curves1 = new CurveArray();
                    Curves1.Count = 4;
                    Curves1[0] = new Line(new xy(0, 0), new xy(1, 0));
                    Curves1[1] = new Line(new xy(1, 0), new xy(1, 1));
                    Curves1[2] = new Line(new xy(1, 1), new xy(0, 1));
                    Curves1[3] = new Line(new xy(0, 1), new xy(0, 0));
                    _Loca.Add(Curves1);
                  
                    PolygonMode = PolygonMode.Fill;
                    drawPolyPolyCurve(_Loca);
                    
                    break;
                case Snapkind.TextSnapItem:
                   
                   
                    Font.FontSize = 4; 
                    xy Pos= getEnvText(Font, "Drawing 3D");
                    drawText(Font, new xyz(-Pos.X/2,0,0), "Drawing 3D", 2);
                   
                    break;
                case Snapkind.MeshSnapItem:

                    int[] Indices = new int[] { 0, 1, 2 };
                    xyzf[] Position = new xyzf[] { new xyzf(0, 0, 0), new xyzf(3, 5, 0), new xyzf(6, 0, 0) };
                    xyzf[] Normal = new xyzf[] { new xyzf(0, 0, 1), new xyzf(0, 0, 1), new xyzf(0, 0, 1) };
                    xyf[] Texture = new xyf[] { new xyf(0, 0), new xyf(3, 5), new xyf(6, 0) };
                    xyzf[] Colors = new xyzf[] { new xyzf(1, 0, 0), new xyzf(0, 1, 0), new xyzf(0, 0, 1) };
                   
                   drawMesh(Indices, Position, Normal, null, Colors);
                    break;
                case Snapkind.PolyLineSnapItem:

                    xyArray Poly = new xyArray();
                  
                    Poly.data = new xy[] { new xy(1, 1), new xy(3, 4), new xy(5, 4), new xy(6, 2), new xy(1, 1) };
                    PolygonMode = PolygonMode.Fill;
                    PenWidth = 3;
                  
                     drawPolyLine(Poly);
                    PolygonMode = PolygonMode.Fill;
                   
                   
                    break; 
                case Snapkind.CurveSnapItem3D:
 
                    Bezier3D Bezier = new Bezier3D(new xyz(1, 2, 1), new xyz(3, -2, 3), new xyz(5, 3, 2), new xyz(7,1,1));

                    drawCurve(Bezier);
                  

                    break;
                case Snapkind.PolyLineSnapItem3D:
                    xyzArray Poly3d = new xyzArray();
                    Poly3d.data = new xyz[] { new xyz(0, 0, 1), new xyz(0, 3, 1), new xyz(3, 3, 1), new xyz(4, 0 ,1), new xyz(0, 0, 1) };
                    drawPolyLine(Poly3d);
                   break;
                case Snapkind.PolyPolyLineSnapItem3D:
                   
                    xyzArray AA = new xyzArray();
                    AA.Add(new xyz(1, 1, 1));
                    AA.Add(new xyz(0, 1, 1));
                    AA.Add(new xyz(0, 0, 1));
                    AA.Add(new xyz(1, 0, 1));
                    AA.Add(new xyz(1, 1, 1));
                    xyzArray BB = new xyzArray();
                   
                    BB.Add(new xyz(3, 3, 1));
                    BB.Add(new xyz(3, -2, 1));
                    BB.Add(new xyz(-1, -2, 1));
                    BB.Add(new xyz(-1, 3, 1));
                    BB.Add(new xyz(3, 3, 1));



                    Loxyz L = new Loxyz();
                    L.Add(AA);
                    L.Add(BB);

                   
                    drawPolyPolyLine(L);
                 
                    break;
                case Snapkind.PolyPolyLineSnapItem:

                    xyArray _AA = new xyArray();
                    _AA.Add(new xy(2, 0.5));
                    _AA.Add(new xy(0, 0.5));
                    _AA.Add(new xy(0, 0));
                    _AA.Add(new xy(2, 0));
                    _AA.Add(new xy(2, 0.5));
                    xyArray _BB = new xyArray();

                    _BB.Add(new xy(4, 4));
                    _BB.Add(new xy(4, -2));
                    _BB.Add(new xy(-1, -2));
                    _BB.Add(new xy(-1, 4));
              
                    _BB.Add(new xy(4, 4));
                    Loxy _L = new Loxy();
                    _L.Add(_AA);
                    _L.Add(_BB);


                    drawPolyPolyLine(_L);

                    break;
                    
                case Snapkind.SphereSnapItem:
                   drawSphere(new xyz(2,1,1),3);


                    break;
                case Snapkind.BoxSnapItem:
 
                    drawBox(new xyz(0, 0, 0), new xyz(4, 3, 4));
                    break;
                default:
                    break;
            
            }
            ACursor.Paint(this);
        }

    }
  
}
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