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今天我们 学习 的这个例子是关于规则重定义中的夹点重定义，关于规则重定义我们之前有提到过的。在这里我们就不在细致说明了。今天我们来学习这个夹点重定义，这个例子是选择了一个圆，然后再为这个圆创建两条过圆心的直线（也就是直径），然后我们现在要做的是移动直线与圆的交点，或者圆心，图形也随着变化。那么在这个例子我们会用到扩展数据，存储直线经过圆心的角度，以便每次重绘制。可以细细品味 代码 。
来看一下录制的效果。
下面看一下代码。
using Autodesk.AutoCAD.ApplicationServices;using Autodesk.AutoCAD.DatabaseServices;using Autodesk.AutoCAD.EditorInput;using Autodesk.AutoCAD.Geometry;using Autodesk.AutoCAD.GraphicsInterface;using Autodesk.AutoCAD.Runtime;using System;using System.Collections.Generic; namespace DevDaysGripMenusSample{ public class TestOverrule { private static DrawOverrule m_drawOverrule = new DrawOverrule(); private static PropsOverrule m_propertiesOverrule = new PropsOverrule(); private static XformOverrule m_xformOverrule = new XformOverrule(); private static ObjectSnapOverrule m_osnapOverrule = new ObjectSnapOverrule(); private static GripPointOverrule m_gripOverrule = new GripPointOverrule(); private static HiliteOverrule m_hightlightOverrule = new HiliteOverrule(); private static ObjOverrule m_objectOverrule = new ObjOverrule(); private static Overrule[] m_overrules = new Overrule[] { m_drawOverrule, m_propertiesOverrule, m_xformOverrule, m_osnapOverrule, m_gripOverrule, m_hightlightOverrule, m_objectOverrule }; private static System.Collections.Generic.List<ObjectId> m_overruledObjects = new System.Collections.Generic.List<ObjectId>(); private static readonly string RegAppName = "AsdkOverruleTest"; private static bool m_overruleAdded = false; [CommandMethod("overrule")] static public void Start() { Document doc = Application.DocumentManager.MdiActiveDocument; Editor ed = doc.Editor; PromptEntityResult res = ed.GetEntity("Select a circle to overrule"); if (res.Status != PromptStatus.OK) return; if (res.ObjectId.ObjectClass != RXObject.GetClass(typeof(Circle))) { ed.WriteMessage("Selected object is not a circle!\n"); return; } if (m_overruledObjects.Count == 0) { Application.DocumentManager.DocumentToBeDestroyed += new DocumentCollectionEventHandler(DocumentManager_DocumentToBeDestroyed); } if (!m_overruledObjects.Contains(res.ObjectId)) { Database db = res.ObjectId.Database; using (Transaction t = db.TransactionManager.StartTransaction()) { RegAppTable tbl = (RegAppTable)t.GetObject(db.RegAppTableId, OpenMode.ForRead, false); if (!tbl.Has(RegAppName)) { RegAppTableRecord app = new RegAppTableRecord(); app.Name = RegAppName; tbl = (RegAppTable)t.GetObject(db.RegAppTableId, OpenMode.ForWrite, false); tbl.Add(app); t.AddNewlyCreatedDBObject(app, true); } Circle c = (Circle)t.GetObject(res.ObjectId, OpenMode.ForRead); if (c.GetXDataForApplication(RegAppName) == null) { c = (Circle)t.GetObject(res.ObjectId, OpenMode.ForWrite); c.XData = new ResultBuffer( new TypedValue((int)DxfCode.ExtendedDataRegAppName, RegAppName), new TypedValue((int)DxfCode.ExtendedDataReal, Math.PI / 6) //start with 30 degrees ); m_overruledObjects.Add(res.ObjectId); } t.Commit(); } } ObjectId[] ids = m_overruledObjects.ToArray(); foreach (Overrule o in m_overrules) { o.SetIdFilter(ids); if (!m_overruleAdded) Overrule.AddOverrule(RXObject.GetClass(typeof(Circle)), o, false); } m_overruleAdded = true; Application.DocumentManager.MdiActiveDocument.Editor.Regen(); } private static void End() { foreach (Overrule o in m_overrules) { Overrule.RemoveOverrule(RXObject.GetClass(typeof(Circle)), o); } Overrule.Overruling = false; Application.DocumentManager.MdiActiveDocument.Editor.Regen(); } private static void DocumentManager_DocumentToBeDestroyed(object sender, DocumentCollectionEventArgs e) { //remove the ids that are going away for (int i = m_overruledObjects.Count - 1; i >= 0; i--) if (m_overruledObjects[i].Database == e.Document.Database) m_overruledObjects.RemoveAt(i); ObjectId[] ids = m_overruledObjects.ToArray(); foreach (Overrule o in m_overrules) o.SetIdFilter(ids); } private static double GetAngle(Circle c) { ResultBuffer rb = c.GetXDataForApplication(RegAppName); return (double)rb.AsArray()[1].Value; } private static LineSegment3d[] GetLines(Circle c) { LineSegment3d[] lines = new LineSegment3d[2]; double angle = GetAngle(c); Point3d center = c.Center; Vector3d normal = c.Normal; Vector3d axis = normal.GetPerpendicularVector() * c.Radius; Vector3d vec = axis.RotateBy(angle, normal); lines[0] = new LineSegment3d(center - vec, center + vec); vec = axis.RotateBy(-angle, normal); lines[1] = new LineSegment3d(center - vec, center + vec); return lines; } private class DrawOverrule : DrawableOverrule { public override bool WorldDraw(Drawable drawable, WorldDraw wd) { Circle c = (Circle)drawable; LineSegment3d[] lines = GetLines(c); foreach (LineSegment3d l in lines) wd.Geometry.WorldLine(l.StartPoint, l.EndPoint); return base.WorldDraw(drawable, wd); } } private class PropsOverrule : PropertiesOverrule { public override void List(Entity entity) { Editor ed = Application.DocumentManager.MdiActiveDocument.Editor; ed.WriteMessage("\tOverrule test\n"); ed.WriteMessage("\t\tAngle is {0}", GetAngle((Circle)entity)); } } private class XformOverrule : TransformOverrule { public override void Explode(Entity entity, DBObjectCollection entitySet) { Circle c = (Circle)entity; entitySet.Add((Circle)entity.Clone()); LineSegment3d[] lines = GetLines(c); foreach (LineSegment3d l in lines) entitySet.Add(new Line(l.StartPoint, l.EndPoint)); } } private class CircleMFMGPE : MultiModesGripPE { internal CircleMFMGPE(GripPointOverrule overrule) : base() { m_overrule = overrule; } public override GripMode CurrentMode(Entity entity, GripData gripData) { if (gripData is GripPointOverrule.MyGrip) { int index = (int)((GripPointOverrule.MyGrip)gripData).CurrentModeId - (int)GripMode.ModeIdentifier.CustomStart; return ((GripPointOverrule.MyGrip)gripData).Modes[index]; } else return null; } public override uint CurrentModeId(Entity entity, GripData gripData) { if (gripData is GripPointOverrule.MyGrip) return (uint)(gripData as GripPointOverrule.MyGrip).CurrentModeId; return 0; } public override bool GetGripModes(Entity entity, GripData gripData, GripModeCollection modes, ref uint curMode) { if (!(gripData is GripPointOverrule.MyGrip)) return false; return (gripData as GripPointOverrule.MyGrip).GetGripModes(ref modes, ref curMode); } public override MultiModesGripPE.GripType GetGripType(Entity entity, GripData gripData) { return (gripData is GripPointOverrule.MyGrip) ? MultiModesGripPE.GripType.Secondary : MultiModesGripPE.GripType.Primary; } public override void Reset(Entity entity) { } public override bool SetCurrentMode(Entity entity, GripData gripData, uint curMode) { if (!(gripData is GripPointOverrule.MyGrip)) return false; (gripData as GripPointOverrule.MyGrip).CurrentModeId = (GripMode.ModeIdentifier)curMode; return true; } private GripPointOverrule m_overrule; } private class GripPointOverrule : GripOverrule { private CircleMFMGPE __theMFMGPE = null; internal GripPointOverrule() { __theMFMGPE = new CircleMFMGPE(this); RXObject.GetClass(typeof(Circle)).AddX(RXObject.GetClass(typeof(CircleMFMGPE)), __theMFMGPE); } internal abstract class MyGrip : GripData { protected MyGrip() { __modes = new GripModeCollection(); } private GripMode.ModeIdentifier __curModeId = GripMode.ModeIdentifier.CustomStart; public virtual GripMode.ModeIdentifier CurrentModeId { get { return __curModeId; } set { __curModeId = value; } } private GripModeCollection __modes; public virtual GripModeCollection Modes { get { return __modes; } } public abstract void Move(Entity entity, Vector3d offset); public abstract bool GetGripModes(ref GripModeCollection modes, ref uint curMode); public override bool ViewportDraw(ViewportDraw vd, ObjectId entityId, GripData.DrawType type, Point3d? imageGripPoint, int gripSize) { Point2d unit = vd.Viewport.GetNumPixelsInUnitSquare(GripPoint); vd.Geometry.Circle(GripPoint, gripSize / unit.X, vd.Viewport.ViewDirection); return true; } protected void MoveWorker(Entity entity, Vector3d offset) { Circle c = (Circle)entity; Point3d newGripPoint = GripPoint + offset; c.Radius = newGripPoint.DistanceTo(c.Center); } } public class RowGripMenuItem : Autodesk.AutoCAD.Runtime.IMenuItem { private GripData _Grip; private Action _Action; private List<IMenuItem> _Items = new List<IMenuItem>(); public delegate void Action(GripData g, RowGripMenuItem r); public RowGripMenuItem(GripData g, Action a) { _Grip = g; _Action = a; } public bool Checked { get; set; } public bool Enabled { get; set; } public System.Drawing.Icon Icon { get; set; } public string Text { get; set; } public bool Visible { get; set; } public System.Collections.Generic.IEnumerable<Autodesk.AutoCAD.Runtime.IMenuItem> Items { get { return _Items; } } public void OnClicked(System.EventArgs eventArgs) { if (_Action != null) _Action.Invoke(_Grip, this); } public void Add(IMenuItem m) { _Items.Add(m); } public void Remove(IMenuItem m) { _Items.Remove(m); } public event EventHandler Click; } private class LowerLeftGrip : MyGrip { public enum myMFMGPEModeId { kStretchRadiusX = GripMode.ModeIdentifier.CustomStart, kStretchRadiusY, kIncrementRadiusByOne } public LowerLeftGrip() { GripMode m1 = new GripMode(); m1.ModeId = (uint)myMFMGPEModeId.kStretchRadiusX; m1.DisplayString = "Stretch radius, offset mapped to X diection."; m1.CLIPromptString = "\nSpecify new vertex point:"; m1.CLIKeywordList = "STretch MOve ROtate SCale MIrror Base Copy Undo X EXit dummy GMove CGizmo _STretch MOve ROtate SCale MIrror Base Copy Undo X EXit dummy GMove CGizmo"; m1.CLIDisplayString = "\n** STRETCH X **"; m1.Action = GripMode.ActionType.DragOn; Modes.Add(m1); GripMode m2 = new GripMode(); m2.ModeId = (uint)myMFMGPEModeId.kStretchRadiusY; m2.DisplayString = "Stretch radius, offset mapped to Y diection."; m2.CLIDisplayString = "\n** STRETCH Y **"; m1.CLIKeywordList = "STretch MOve ROtate SCale MIrror Base Copy Undo X EXit dummy GMove CGizmo _STretch MOve ROtate SCale MIrror Base Copy Undo X EXit dummy GMove CGizmo"; m2.CLIPromptString = "\nSpecify new vertex point:"; m2.Action = GripMode.ActionType.DragOn; Modes.Add(m2); GripMode m3 = new GripMode(); m3.ModeId = (uint)myMFMGPEModeId.kIncrementRadiusByOne; m3.DisplayString = "Increment radius by 1."; m3.CLIPromptString = "\nSpecify new vertex point:"; m3.CLIKeywordList = "STretch MOve ROtate SCale MIrror Base Copy Undo X EXit dummy GMove CGizmo _STretch MOve ROtate SCale MIrror Base Copy Undo X EXit dummy GMove CGizmo"; m3.CLIDisplayString = "\n** INCREMENT RADIUS BY 1 **"; m3.Action = GripMode.ActionType.Immediate; Modes.Add(m3); CurrentModeId = 0; } public override bool GetGripModes(ref GripModeCollection modes, ref uint curMode) { //modes = __modes; foreach (GripMode m in Modes) modes.Add(m); //curMode = (uint)CurrentModeId; return true; } public override void Move(Entity entity, Vector3d offset) { switch ((myMFMGPEModeId)CurrentModeId) { case myMFMGPEModeId.kStretchRadiusX: offset = offset.Subtract(new Vector3d(0, offset.Y, 0)); break; case myMFMGPEModeId.kStretchRadiusY: offset = offset.Subtract(new Vector3d(offset.X, 0, 0)); break; case myMFMGPEModeId.kIncrementRadiusByOne: Vector3d v = GripPoint - ((Circle)entity).Center; offset += v.GetNormal(); break; } MoveWorker(entity, offset); return; } public override IEnumerable<Autodesk.AutoCAD.Runtime.IMenuItem> OnRightClick(GripDataCollection hotGrips, ObjectIdCollection entities) { List<RowGripMenuItem> GripMenu = new List<RowGripMenuItem>(); GripMenu.Add(new RowGripMenuItem(this, null) { Text = "Test-1", Icon = Resource1.MyTestIcon } ); GripMenu.Add(new RowGripMenuItem(this, null) { Text = "Test - 2", Icon = Resource1.MyTestIcon } ); return GripMenu; } } private class UpperRightGrip : MyGrip { public override bool GetGripModes(ref GripModeCollection modes, ref uint curMode) { GripMode m1 = new GripMode(); m1.ModeId = 0; m1.DisplayString = "Upper right not implemeted"; m1.Action = GripMode.ActionType.Immediate; modes.Add(m1); curMode = 0; return true; } public override void Move(Entity entity, Vector3d offset) { MoveWorker(entity, offset); } } private class UpperLeftGrip : MyGrip { public override bool GetGripModes(ref GripModeCollection modes, ref uint curMode) { GripMode m1 = new GripMode(); m1.ModeId = 0; m1.DisplayString = "Upper left not implemeted"; m1.Action = GripMode.ActionType.Immediate; modes.Add(m1); curMode = 0; return true; } public override void Move(Entity entity, Vector3d offset) { MoveWorker(entity, offset); } } private class LowerRightGrip : MyGrip { public override bool GetGripModes(ref GripModeCollection modes, ref uint curMode) { GripMode m1 = new GripMode(); m1.ModeId = 0; m1.DisplayString = "Lower right not implemeted"; m1.Action = GripMode.ActionType.Immediate; modes.Add(m1); curMode = 0; return true; } public override void Move(Entity entity, Vector3d offset) { MoveWorker(entity, offset); } } private GripData[] m_grips = new GripData[4]; public override void GetGripPoints(Entity entity, GripDataCollection grips, double curViewUnitSize, int gripSize, Vector3d curViewDir, Autodesk.AutoCAD.DatabaseServices.GetGripPointsFlags bitFlags) { base.GetGripPoints(entity, grips, curViewUnitSize, gripSize, curViewDir, bitFlags); Circle c = (Circle)entity; LineSegment3d[] lines = GetLines(c); m_grips[0] = new LowerLeftGrip(); m_grips[0].GripPoint = lines[0].StartPoint; m_grips[1] = new UpperRightGrip(); m_grips[1].GripPoint = lines[0].EndPoint; m_grips[2] = new UpperLeftGrip(); m_grips[2].GripPoint = lines[1].StartPoint; m_grips[3] = new LowerRightGrip(); m_grips[3].GripPoint = lines[1].EndPoint; foreach (GripData g in m_grips) grips.Add(g); } public override void MoveGripPointsAt(Entity entity, GripDataCollection grips, Vector3d offset, Autodesk.AutoCAD.DatabaseServices.MoveGripPointsFlags bitFlags) { foreach (GripData grip in grips) { MyGrip myGrip = grip as MyGrip; if (myGrip != null) myGrip.Move(entity, offset); else base.MoveGripPointsAt(entity, grips, offset, bitFlags); } } } private class ObjectSnapOverrule : OsnapOverrule { public override void GetObjectSnapPoints(Entity entity, ObjectSnapModes snapMode, IntPtr gsSelectionMark, Point3d pickPoint, Point3d lastPoint, Matrix3d viewTransform, Point3dCollection snapPoints, IntegerCollection geometryIds) { base.GetObjectSnapPoints(entity, snapMode, gsSelectionMark, pickPoint, lastPoint, viewTransform, snapPoints, geometryIds); if ((snapMode & ObjectSnapModes.ModeEnd) == ObjectSnapModes.ModeEnd) { Circle c = (Circle)entity; LineSegment3d[] lines = GetLines(c); foreach (LineSegment3d l in lines) { snapPoints.Add(l.StartPoint); snapPoints.Add(l.EndPoint); } } } } private class HiliteOverrule : HighlightOverrule { public override void Highlight(Entity entity, FullSubentityPath subId, bool highlightAll) { base.Highlight(entity, subId, highlightAll); } public override void Unhighlight(Entity entity, FullSubentityPath subId, bool highlightAll) { base.Unhighlight(entity, subId, highlightAll); } } private class ObjOverrule : ObjectOverrule { public override void Erase(DBObject dbObject, bool erasing) { //prevent the object from being deleted base.Erase(dbObject, erasing); if (erasing) throw new Autodesk.AutoCAD.Runtime.Exception(ErrorStatus.CannotBeErasedByCaller); } } }}更多内容，敬请关注公众号
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