视图操作类，缩放 -

Imports Autodesk.AutoCAD.Interop.Common
Imports Autodesk.AutoCAD.Interop
Imports Autodesk.AutoCAD.Geometry
Imports Autodesk.AutoCAD.EditorInput
Imports Autodesk.AutoCAD.DatabaseServices
Imports Autodesk.AutoCAD.ApplicationServices
Imports System.Text
Imports System.Linq
Imports System.Collections.Generic
Imports System

''' <summary>
'''
''' desc：视图操作类，缩放
''' auth：LYK
''' date：2017/12/11 10:36:26
'''
''' </summary>

Namespace CadTool
    Public NotInheritable Class ViewTableTools
        Private Sub New()
        End Sub
        ''' <summary>
        ''' 实现视图的比例缩放
        ''' </summary>
        ''' <param name="ed"></param>
        ''' <param name="scale">缩放比例</param>
        <System.Runtime.CompilerServices.Extension> _
        Public Shared Sub ZoomScaled(ed As Editor, scale As Double)
            '得到当前视图
            'ViewTableRecord view = ed.GetCurrentView();
            'view.Width /= scale;
            'view.Height /= scale;
            Dim 更新当前视图 As 修改视图的宽度和高度
            'ed.SetCurrentView(view);
            acadApplication.ZoomScaled(scale, AcZoomScaleType.acZoomScaledRelative)
        End Sub

        Private Shared acadApplication As AcadApplication = CType(Application.AcadApplication, AcadApplication)
        ''' <summary>
        ''' 实现视图的窗口缩放
        ''' </summary>
        ''' <param name="ed"></param>
        ''' <param name="pt1">窗口角点</param>
        ''' <param name="pt2">窗口角点</param>
        <System.Runtime.CompilerServices.Extension> _
        Public Shared Sub ZoomWindow(ed As Editor, pt1 As Point3d, pt2 As Point3d)
            Dim doubles1 As Double() = New Double(2) {pt1.X, pt1.Y, pt1.Z}
            Dim doubles2 As Double() = New Double(2) {pt2.X, pt2.Y, pt2.Z}
            '参数要求是双精度的数组
            acadApplication.ZoomWindow(doubles1, doubles2)
            '创建一临时的直线用于获取两点表示的范围
            'using (Line line = new Line(pt1, pt2))
            '{
            '    获取两点表示的范围
            '    //Extents3d extents = new Extents3d(line.GeomExtents.MinPoint, line.GeomExtents.MaxPoint);
            '    获取范围内的最小值点及最大值点
            '    //Point2d minPt = new Point2d(extents.MinPoint.X, extents.MinPoint.Y);
            '    //Point2d maxPt = new Point2d(extents.MaxPoint.X, extents.MaxPoint.Y);
            '    得到当前视图
            '    //ViewTableRecord view = new ViewTableRecord();

            '    设置视图的中心点、高度和宽度
            '    //view.CenterPoint = minPt + (maxPt - minPt) / 2;
            '    view.Height = maxPt.Y - minPt.Y;
            '    view.Width = maxPt.X - minPt.X;
            '    //view.Height = maxPt.Y - minPt.Y + 10;
            '    //view.Width = maxPt.X - minPt.X + 10;
            '    更新当前视图
            '    ed.SetCurrentView(view);

            '}
        End Sub
        ''' <summary>
        ''' 根据图形边界显示视图
        ''' </summary>
        ''' <param name="ed"></param>
        <System.Runtime.CompilerServices.Extension> _
        Public Shared Sub ZoomExtens(ed As Editor)
            acadApplication.ZoomExtents()
            'Database db = ed.Document.Database;
            'db.UpdateExt(true);
            Dim 根据当前图形的界限范围对视图进行缩放 As 更新当前模型空间的范围
            'if (db.Extmax.X < db.Extmin.X)
            '{
            '    Plane plane = new Plane();
            '    Point3d pt1 = new Point3d(plane, db.Limmin);
            '    Point3d pt2 = new Point3d(plane, db.Limmax);
            '    ed.ZoomWindow(pt1, pt2);
            '}
            'else
            '{
            '    ed.ZoomWindow(db.Extmin, db.Extmax);
            '}
        End Sub
        ''' <summary>
        ''' 根据对象的范围显示视图
        ''' </summary>
        ''' <param name="editor"></param>
        ''' <param name="objectId">实体ID</param>
        <System.Runtime.CompilerServices.Extension> _
        Public Shared Sub ZoomObject(editor As Editor, objectId As ObjectId)
            Dim db As Database = editor.Document.Database
            Using trans As Transaction = db.TransactionManager.StartTransaction()
                '获取实体对象
                Dim entity As Entity = TryCast(trans.GetObject(objectId, OpenMode.ForRead), Entity)
                If entity Is Nothing Then
                    Return
                End If
                '根据实体的范围对视图进行缩放
                Dim extents3 As Extents3d = entity.GeomExtents
                extents3.TransformBy(editor.CurrentUserCoordinateSystem.Inverse())
                editor.ZoomWindow(extents3.MinPoint, extents3.MaxPoint)
                trans.Commit()
            End Using
        End Sub
    End Class
End Namespace

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