Example of Working with Splines

Sample project of working with splines is located in the Drawing\Examples\DevGuide\OdSplinesEx subdirectory of the ODA installation folder (for example, C:\Program Files\Open Design Alliance).

The sample project demonstrates creating two identical splines, using NURBS data and using fit data, and setting and displaying its properties. The application creates a .dwg file, and then prints the following information about the created splines objects:

Type
Closed status
Periodic status
Plane
Area
Start parameter
End parameter
Start point
First derivative of the start point
Second derivative of the start point
End point
First derivative of the end point
Second derivative of the end point
Total length
Degree
Rational status
Control point tolerance
Knot tolerance
Control points
Knots
Fit points
Fit tolerance
Start tangent vector
End tangent vector

The application generates a .dwg file that contains two spline objects, which show two methods of creating the splines:

First spline is made using fit data.
Second spline is made using control points and knot vector.

See Also