About Modifying a Spline
You can modify a spline by using the Spline tab, the shortcut menu, or moving interpolation points by holding down the mouse button and moving them to desired locations. You can perform the following modifications to splines:
• Move interpolation points.
• Add points or vertices.
• Delete points or vertices.
• Manipulate a spline using control points.
• Create a control polygon.
• Delete a control polygon.
• Sparse a spline.
• Smooth a spline.
• Modify the coordinates of spline points.
• Read spline coordinates to a file.
• Get information about spline points.
• Interpret coordinate system as Cartesian.
• Interpret coordinate system as polar.