[即时预览] 画圆即时预览 - EaBIM

public void DrawCircle2P()
{
Database db = HostApplicationServices.WorkingDatabase;
Transaction trans = db.TransactionManager.StartTransaction();
Editor ed = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;
Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
using (trans)
{
using (DocumentLock docLock = doc.LockDocument())
{
//获得
BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);
BlockTableRecord btr = (BlockTableRecord)trans.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
PromptPointOptions prPos = new PromptPointOptions("\n 指定圆心点");
Point3d position = new Point3d(0, 0, 0);
PromptPointResult prPosRes;
prPosRes = ed.GetPoint(prPos);
if (prPosRes.Status != PromptStatus.OK)
return;
position = prPosRes.Value;
//Jig动态画圆
CirJig circleJig = new CirJig(position);
bool bSuccess = false;
bool bCancle = false;
do
{
PromptResult res = ed.Drag(circleJig);
bCancle = (res.Status == PromptStatus.Cancel);
bSuccess = (res.Status == PromptStatus.OK);
} while (!bSuccess && !bCancle);
if (!bSuccess)
return;
Circle circle = circleJig.GetEntity();
btr.AppendEntity(circle);
trans.AddNewlyCreatedDBObject(circle, true);
trans.Commit();
}
}
}
/// <summary>
/// Jig类动态画圆
/// </summary>
class CirJig : DrawJig
{
private Circle mycircle;
private double radius;
private Point3d center;
/// <summary>
/// 初始化Jig
/// </summary>
/// <param name="circenter">圆心点</param>
public CirJig(Point3d circenter)
{
center = circenter;
mycircle = new Circle();
mycircle.Center = center;
mycircle.Radius = 0.001;
}
protected override bool WorldDraw(Autodesk.AutoCAD.GraphicsInterface.WorldDraw draw)
{
//throw new NotImplementedException();
draw.Geometry.Draw(mycircle);
return true;
}
protected override SamplerStatus Sampler(JigPrompts prompts)
{
//throw new NotImplementedException();
JigPromptPointOptions optJigDis = new JigPromptPointOptions("\n选择半径");
optJigDis.UserInputControls = UserInputControls.NullResponseAccepted | UserInputControls.Accept3dCoordinates;
PromptPointResult resJigDis = prompts.AcquirePoint(optJigDis);
Point3d tempPt = resJigDis.Value;
//每次计算新半径
double tempradius = Math.Sqrt((tempPt.X - center.X) * (tempPt.X - center.X) + (tempPt.Y - center.Y) * (tempPt.Y - center.Y));
if (resJigDis.Status == PromptStatus.Cancel)
{
return SamplerStatus.Cancel;
}
if (radius != tempradius)
{ //将新半径赋值给圆
radius = tempradius;
if (tempradius != 0)
{
mycircle.Radius = radius;
}
return SamplerStatus.OK;
}
else
{
return SamplerStatus.NoChange;
}
}
/// <summary>
///
/// </summary>
/// <returns>返回圆</returns>
public Circle GetEntity()
{
return mycircle;
}
}

复制代码