ARX 反回曲线上一定距离的点 函数

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1. 反回曲线上一定距离的点（默认从起点开始计算）
2. pCurve:曲线指针，dist：距离，point：要返回的点
3. Adesk::Boolean isGotoNext  true:沿着正向寻找，false：沿着反方向寻找
4. static void GetPtAtDistOnCurve(const AcGeCurve2d* pCurve,const AcGePoint2d& ptInput,double dist,AcGePoint2d& point,Adesk::Boolean isGotoNext)
5. {
6. if(pCurve == NULL)
7. {
8. return;
9. }
10. AcGePoint2d ptS;
11. ptS = ptInput;
12. double pa = 0.0;
13. double datumParam = 0.0;
14. //Adesk::Boolean posParamDir = Adesk::kTrue;
16. datumParam = pCurve->paramOf(ptS);
17. pa = pCurve->paramAtLength(datumParam,dist,isGotoNext);
18. point = pCurve->evalPoint(pa);
19. }

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