GetPoint Method （.NET）

该方法提示用户在命令提示符下指定一个点。该对象允许您控制输入的输入以及提示消息的显示方式。对象的属性控制是否从基点绘制橡皮筋线。对象的属性允许您定义关键字，除了指定点外，还可以在命令提示符下输入关键字。GetPointPromptPointOptionsUseBasePointBasePointPromptPointOptionsKeywordsPromptPointOptions

获取用户选择的点

下面的示例提示用户输入两个点，然后使用这些点作为起点和终点绘制一条线。

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

    Dim pPtRes As PromptPointResult
    Dim pPtOpts As PromptPointOptions = New PromptPointOptions("")

    '' Prompt for the start point
    pPtOpts.Message = vbLf & "Enter the start point of the line: "
    pPtRes = acDoc.Editor.GetPoint(pPtOpts)
    Dim ptStart As Point3d = pPtRes.Value

    '' Exit if the user presses ESC or cancels the command
    If pPtRes.Status = PromptStatus.Cancel Then Exit Sub

    '' Prompt for the end point
    pPtOpts.Message = vbLf & "Enter the end point of the line: "
    pPtOpts.UseBasePoint = True
    pPtOpts.BasePoint = ptStart
    pPtRes = acDoc.Editor.GetPoint(pPtOpts)
    Dim ptEnd As Point3d = pPtRes.Value

    If pPtRes.Status = PromptStatus.Cancel Then Exit Sub

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

        Dim acBlkTbl As BlockTable
        Dim acBlkTblRec As BlockTableRecord

        '' Open Model space for write
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, _
                                     OpenMode.ForRead)

        acBlkTblRec = acTrans.GetObject(acBlkTbl(BlockTableRecord.ModelSpace), _
                                        OpenMode.ForWrite)

        '' Define the new line
        Using acLine As Line = New Line(ptStart, ptEnd)
            '' Add the line to the drawing
            acBlkTblRec.AppendEntity(acLine)
            acTrans.AddNewlyCreatedDBObject(acLine, True)
        End Using

        '' Zoom to the extents or limits of the drawing
        acDoc.SendStringToExecute("._zoom _all ", True, False, False)

        '' Commit the changes and dispose of the transaction
        acTrans.Commit()
    End Using
End Sub

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

    PromptPointResult pPtRes;
    PromptPointOptions pPtOpts = new PromptPointOptions("");

    // Prompt for the start point
    pPtOpts.Message = "\nEnter the start point of the line: ";
    pPtRes = acDoc.Editor.GetPoint(pPtOpts);
    Point3d ptStart = pPtRes.Value;

    // Exit if the user presses ESC or cancels the command
    if (pPtRes.Status == PromptStatus.Cancel) return;

    // Prompt for the end point
    pPtOpts.Message = "\nEnter the end point of the line: ";
    pPtOpts.UseBasePoint = true;
    pPtOpts.BasePoint = ptStart;
    pPtRes = acDoc.Editor.GetPoint(pPtOpts);
    Point3d ptEnd = pPtRes.Value;

    if (pPtRes.Status == PromptStatus.Cancel) return;

    // Start a transaction
    using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
    {
        BlockTable acBlkTbl;
        BlockTableRecord acBlkTblRec;

        // Open Model space for write
        acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                                        OpenMode.ForRead) as BlockTable;

        acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                                        OpenMode.ForWrite) as BlockTableRecord;

        // Define the new line
        using (Line acLine = new Line(ptStart, ptEnd))
        {
            // Add the line to the drawing
            acBlkTblRec.AppendEntity(acLine);
            acTrans.AddNewlyCreatedDBObject(acLine, true);
        }

        // Zoom to the extents or limits of the drawing
        acDoc.SendStringToExecute("._zoom _all ", true, false, false);

        // Commit the changes and dispose of the transaction
        acTrans.Commit();
    }
}

Sub GetPointsFromUser()
    Dim startPnt As Variant
    Dim endPnt As Variant
    Dim prompt1 As String
    Dim prompt2 As String
 
    prompt1 = vbCrLf & "Enter the start point of the line: "
    prompt2 = vbCrLf & "Enter the end point of the line: "
 
    ' Get the first point without entering a base point
    startPnt = ThisDrawing.Utility.GetPoint(, prompt1)
 
    ' Use the point entered above as the base point
    endPnt = ThisDrawing.Utility.GetPoint(startPnt, prompt2)
 
    ' Create a line using the two points entered
    ThisDrawing.ModelSpace.AddLine startPnt, endPnt
    ThisDrawing.Application.ZoomAll
End Sub