vlax-curve-getSecondDeriv (AutoLISP/ActiveX)
返回指定位置处曲线的二阶导数(以 WCS 为单位) 支持的平台:仅限 Windows 签名(vlax-curve-getSecondDeriv curve-obj param)
返回值类型:列出或无 3D 向量(如果成功);否则。nil 例子对于以下示例,假定它指向函数示例中所示的样条曲线。splineObjvlax-curve-getDistAtParam 获取曲线的起始参数: (setq startSpline (vlax-curve-getStartParam splineObj)) 0.0 获取曲线的结束参数: (setq endSpline (vlax-curve-getEndParam splineObj)) 17.1546 确定曲线中间参数处的二阶导数: (vlax-curve-getSecondDeriv splineObj ( / (- endspline startspline) 2)) (0.0165967 0.150848 0.0) 相关参考 |
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