SPLINE

Purpose:

To enable a user to create a spline through a set of points, with controlled tangency where required, and to include such in 2-D drawings

Instructions:

1. In the Insert menu, click Spline.

2. When the routine is first entered, respond to the system multiple choice question prompt that the purpose is to 'create' a spline. The system will then request information regarding tangency conditions, and the user must select from one of the three options given. The following assumes that the choice of 'none' has been selected, and the other options are reviewed in the following section.

3. Select, with the cursor, the first point, and which will be the starting point, and then select the other points in the same sequence in which it is required that the spline is to be fitted. Signify that all of the points to be splined through have been identified by clicking the screen button for Input Complete.

4. The system will create and display a spline together with the previously defined points, together with a request that the user respond to the question, is the spline that has been created 'OK'.

Options:

If the user has selected tangency control over the spline at the first and last points, or at all points, then the system will request the user to input the required angle in degrees as each particular point is identified. The angle is defined where positive denotes anti-clockwise and measured from the horizontal

Ability to change/modify if required.

Result:

A spline will be created, displayed on the screen and stored in the drawing file. The color of the spline will be black, unless the user has changed the color through the Format > Colour command, and the line type will be solid.