vlax-curve-getPointAtParam

vlax-curve-getPointAtDist

V Functions

vlax-curve-getSecondDeriv

 

AutoLISP Reference Guide > AutoLISP Functions > V Functions > 

vlax-curve-getPointAtParam

Returns the point at the specified parameter value along a curve

(vlax-curve-getPointAtParam curve-obj param)

Arguments

curve-obj

The VLA-object to be measured.

param

A number specifying a parameter on the curve.

Return Values

A 3D point list representing a point on the curve, if successful; otherwise nil.

Examples

For the following example, assume that splineObj points to the spline shown in the example for vlax-curve-getDistAtParam.

Obtain the start parameter of the curve:

_$ (setq startSpline (vlax-curve-getStartParam
splineObj))

0.0

Obtain the end parameter of the curve:

_$ (setq endSpline (vlax-curve-getEndParam
splineObj))

17.1546

Determine the point at the parameter midway along the curve:

_$ (vlax-curve-getPointAtParam
splineObj 

         ( / (- endspline startspline)
2))
    

(6.71386 2.82748 0.0)