Spline Object (ActiveX)

A quadratic or cubic NURBS (nonuniform rational B-spline) curve.

Supported Platforms: Windows only

Class Information

Class Name

AcadSpline

Object Inheritance

Object
   AcadObject
      AcadEntity
         AcadSpline

Create Using

VBA

ModelSpace.AddSpline
PaperSpace.AddSpline
Block.AddSpline

Access Via

VBA

ModelSpace.Item
PaperSpace.Item
Block.Item
SelectionSet.Item
Group.Item

Members

These members are part of this object:

Methods	Properties	Events
AddFitPoint ArrayPolar ArrayRectangular Copy Delete DeleteFitPoint ElevateOrder GetBoundingBox GetControlPoint GetExtensionDictionary GetFitPoint GetWeight GetXData Highlight IntersectWith Mirror Mirror3D Move Offset PurgeFitData Reverse Rotate Rotate3D ScaleEntity SetControlPoint SetFitPoint SetWeight SetXData TransformBy Update	Application Area Closed Closed2 ControlPoints Degree Degree2 Document EndTangent EntityTransparency FitPoints FitTolerance Handle HasExtensionDictionary Hyperlinks IsPeriodic IsPlanar IsRational KnotParameterization Knots Layer Linetype LinetypeScale Lineweight Material NumberOfControlPoints NumberOfFitPoints ObjectID ObjectName OwnerID PlotStyleName SplineFrame SplineMethod StartTangent TrueColor Visible Weights	Modified

Remarks

A spline is a smooth curve passing through a given set of points. AutoCAD uses a particular type of spline known as a nonuniform rational B-spline (NURBS) curve. A NURBS curve produces a smooth curve between control points. Splines are useful for creating irregular-shaped curves, for example, drawing contour lines for geographic information system (GIS) applications or automobile design.

You create splines by specifying coordinate points. You can close the spline so the start point and endpoint are coincident and tangent. You can also change the spline-fitting tolerance. Fit tolerance refers to how closely the spline fits the set of fit points you specify. The lower the tolerance, the more closely the spline fits the points. At zero tolerance, the spline passes through the points.

To create a spline, use the AddSpline method.