LINE
- Last UpdatedJan 05, 2024
- 1 minute read
Purpose
To fit a straight segment within the current curve.
Syntax
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LINE < /PERMANENT > |
Description
There are two methods for introducing a straight line segment within a curve. The first is a manipulation of the mathematics of the curve, similar in concept to the ADJUST command, and the other is by the adding special points which control the fitting algorithm.
Command Qualifiers
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None |
In this method the straight line segment within the curve is achieved by making the coefficients of the B-Spline co-linear. The user is required to select the two vertex points between which the coefficients should be adjusted. In order to achieve a straight line there should strictly be two intermediate vertex points between the selected ones. |
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As this is a direct manipulation of the mathematics of the B-Spline curve the PREFIT command should NOT be used after the LINE command. If the PREFIT command is issued the curve will be re-fit through the original data points and the straight line segment will be lost. |
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Note that the straight line does not necessarily start and end at specific data points ( unless they are Knuckles ) because this is a manipulation of the B-Spline mathematics. |
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/PERMANENT |
In this method the straight line segment within the curve is achieved by making two user selected points into Tangent/Knuckle points and assigning an Angle to these points. Any intervening points are automatically REMOVED and the angle calculated is such that when a PREFIT takes place the segment between the two points is a straight line. |
Examples
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LINE |