Create Curved Objects

You can create a variety of curved objects with AutoCAD, including spline curves, circles, arcs, and ellipses. All curves are created on the XY plane of the current WCS.

To create a curve, use one of the following methods:

Creates an arc given the center, radius, start and end angles.

Creates a circle given the center point and radius.

Creates an ellipse given the center point, a point on the major axis, and the radius ratio.

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

Create a Spline object

This example creates a spline in model space using three points (0, 0, 0), (5, 5, 0), and (10, 0, 0). The spline has start and end tangents of (0.5, 0.5, 0.0).

```Sub Ch4_CreateSpline()
```
```	' This example creates a spline object in model space.
```
```	' Declare the variables needed
```
```	Dim splineObj As AcadSpline
```
```	Dim startTan(0 To 2) As Double
```
```	Dim endTan(0 To 2) As Double
```
```	Dim fitPoints(0 To 8) As Double
```

```	' Define the variables
```
```	startTan(0) = 0.5: startTan(1) = 0.5: startTan(2) = 0
```
```	endTan(0) = 0.5: endTan(1) = 0.5: endTan(2) = 0
```
```	fitPoints(0) = 1: fitPoints(1) = 1: fitPoints(2) = 0
```
```	fitPoints(3) = 5: fitPoints(4) = 5: fitPoints(5) = 0
```
```	fitPoints(6) = 10: fitPoints(7) = 0: fitPoints(8) = 0
```

```	' Create the spline
```
```	Set splineObj = ThisDrawing.ModelSpace.AddSpline _
```
```						(fitPoints, startTan, endTan)
```
```	ZoomAll
```
```End Sub
```