操作方法

在CAD操作中SCALE缩放命令的用法：输入SC或SCALE命令，选择要缩入的对象-选择基点-输入缩放比例参数-空格完成。

代码实现

使用API实现的关键点：调用Entity的TransformBy方法。如下：

/// <summary>

/// 缩放

/// </summary>

/// <param name="id">数据ID</param>

/// <param name="basePoint">基点</param>

/// <param name="scale">缩放比例参数-</param>

public static void Scale(ObjectId id, Point3d basePoint, double scale)

{

Matrix3d transform = Matrix3d.Scaling(scale, basePoint);

 

Database db = id.Database;

 

using (Transaction tr = db.TransactionManager.StartTransaction())

{

try

{

Entity ent = (Entity)tr.GetObject(id, OpenMode.ForWrite);

 

if (ent != null)

{

ent.TransformBy(transform);

}

 

tr.Commit();

 

}

catch (Autodesk.AutoCAD.Runtime.Exception ex)

{

AcadApp.ShowAlertDialog(ex.Message);

}

}

}