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ObjectARX 开发指南

创建样条对象（.NET）

2023-1-1 14:55| 发布者: admin| 查看: 329| 评论: 0|来自: AutoCAD

本示例使用三个点（0， 0， 0）、（5， 5， 0）和（10， 0， 0）在模型空间中创建一个圆。样条的开始切线和结束切线为（0.5， 0.5， 0.0）。

VB.NET

Imports Autodesk.AutoCAD.Runtime
Imports Autodesk.AutoCAD.ApplicationServices
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.Geometry
 
<CommandMethod("AddSpline")> _
Public Sub AddSpline()
    '' Get the current document and database
    Dim acDoc As Document = Application.DocumentManager.MdiActiveDocument
    Dim acCurDb As Database = acDoc.Database

    '' Start a transaction
    Using acTrans As Transaction = acCurDb.TransactionManager.StartTransaction()

        '' Open the Block table for read
        Dim acBlkTbl As BlockTable
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead)

        '' Open the Block table record Model space for write
        Dim acBlkTblRec As BlockTableRecord
        acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), _
                                        OpenMode.ForWrite)

        '' Define the fit points for the spline
        Dim ptColl As Point3dCollection = New Point3dCollection()
        ptColl.Add(New Point3d(0, 0, 0))
        ptColl.Add(New Point3d(5, 5, 0))
        ptColl.Add(New Point3d(10, 0, 0))

        '' Get a 3D vector from the point (0.5,0.5,0)
        Dim vecTan As Vector3d = New Point3d(0.5, 0.5, 0).GetAsVector

        '' Create a spline through (0, 0, 0), (5, 5, 0), and (10, 0, 0) with a
        '' start and end tangency of (0.5, 0.5, 0.0)
        Using acSpline As Spline = New Spline(ptColl, vecTan, vecTan, 4, 0.0)
            '' Add the new object to the block table record and the transaction
            acBlkTblRec.AppendEntity(acSpline)
            acTrans.AddNewlyCreatedDBObject(acSpline, True)
        End Using

        '' Save the new object to the database
        acTrans.Commit()
    End Using
End Sub

C#

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.Geometry;
 
[CommandMethod("AddSpline")]
public static void AddSpline()
{
    // Get the current document and database
    Document acDoc = Application.DocumentManager.MdiActiveDocument;
    Database acCurDb = acDoc.Database;

    // Start a transaction
    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        // Open the Block table for read
        BlockTable acBlkTbl;
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                                        OpenMode.ForRead) as BlockTable;

        // Open the Block table record Model space for write
        BlockTableRecord acBlkTblRec;
        acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                                        OpenMode.ForWrite) as BlockTableRecord;

        // Define the fit points for the spline
        Point3dCollection ptColl = new Point3dCollection();
        ptColl.Add(new Point3d(0, 0, 0));
        ptColl.Add(new Point3d(5, 5, 0));
        ptColl.Add(new Point3d(10, 0, 0));

        // Get a 3D vector from the point (0.5,0.5,0)
        Vector3d vecTan = new Point3d(0.5, 0.5, 0).GetAsVector();

        // Create a spline through (0, 0, 0), (5, 5, 0), and (10, 0, 0) with a
        // start and end tangency of (0.5, 0.5, 0.0)
        using (Spline acSpline = new Spline(ptColl, vecTan, vecTan, 4, 0.0))
        {
            // Add the new object to the block table record and the transaction
            acBlkTblRec.AppendEntity(acSpline);
            acTrans.AddNewlyCreatedDBObject(acSpline, true);
        }

        // Save the new line to the database
        acTrans.Commit();
    }
}

VBA/ActiveX 代码参考

Sub AddSpline()
    ' This example creates a spline object in model space.
    ' Declare the variables needed
    Dim splineObj As AcadSpline
    Dim startTan(0 To 2) As Double
    Dim endTan(0 To 2) As Double
    Dim fitPoints(0 To 8) As Double
 
    ' Define the variables
    startTan(0) = 0.5: startTan(1) = 0.5: startTan(2) = 0
    endTan(0) = 0.5: endTan(1) = 0.5: endTan(2) = 0
    fitPoints(0) = 1: fitPoints(1) = 1: fitPoints(2) = 0
    fitPoints(3) = 5: fitPoints(4) = 5: fitPoints(5) = 0
    fitPoints(6) = 10: fitPoints(7) = 0: fitPoints(8) = 0
 
    ' Create the spline
    Set splineObj = ThisDrawing.ModelSpace.AddSpline _
                        (fitPoints, startTan, endTan)
    ZoomAll
End Sub