Revit二次开发-Curveloop的放大和缩小

在Revit二次开发工作中，或许会用对Curveloop的放大、缩小、偏移等操作。我们查阅开发手册就可以发现Curveloop这个类提供了Transform这个实例方法，有了这个方法我们对Curveloop进行一些操作，下面是一个简单的Demo，通过放大缩小创建了三块楼板。

protected override Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            var length = 10000 / 304.8;
            var p1 = new XYZ(0, 0, 0);
            var p2 = new XYZ(length, 0, 0);
            var p3 = new XYZ(length, length, 0);
            var p4 = new XYZ(0, length, 0);

            var line1 = Line.CreateBound(p1, p2);
            var line2 = Line.CreateBound(p2, p3);
            var line3 = Line.CreateBound(p3, p4);
            var line4 = Line.CreateBound(p4, p1);
            var curves = new List<Curve>()
            {
                line1,line2,line3,line4
            };
            var curveLoop = CurveLoop.Create(curves);
            var sourceArray = new CurveArray();
            var expansionArray = new CurveArray();
            var reduceArray = new CurveArray();
            foreach (var curve in curveLoop)
            {
                sourceArray.Append(curve);
            }
            var transform = Transform.Identity.ScaleBasis(1.5);
            curveLoop.Transform(transform);
            foreach (var curve in curveLoop)
            {
                expansionArray.Append(curve);
            }
            curveLoop = CurveLoop.Create(curves);
            transform= Transform.Identity.ScaleBasis(0.5);
            curveLoop.Transform(transform);
            foreach (var curve in curveLoop)
            {
                reduceArray.Append(curve);
            }
            RevitDoc.RunTransaction("create floor", () =>
            {
                RevitDoc.Create.NewFloor(expansionArray, false);
                RevitDoc.Create.NewFloor(sourceArray, false);
                RevitDoc.Create.NewFloor(reduceArray, false);
            });
            return Result.Succeeded;
        }