AutoCAD二次开发&夹点规则重定义
转自：https://www.pianshen.com/article/558164728/
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。
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);
}
}
}
}
