#pragma once
class Spline
{
public:
    static void work();

private:
    static void drawSpline(AcDbSpline* pSplineObj);
};

#include "stdafx.h"
#include "Spline.hpp"

void Spline::drawSpline(AcDbSpline* pSplineObj)
{
    AcDbBlockTable* pBlockTable = nullptr;
    acdbHostApplicationServices()->workingDatabase()->getBlockTable(pBlockTable, AcDb::kForRead);
    AcDbBlockTableRecord* pBlockTableRecord = nullptr;
    pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord, AcDb::kForWrite);
    pBlockTableRecord->appendAcDbEntity(pSplineObj);
    pBlockTableRecord->close();
    pBlockTable->close();
}

void Spline::work()
{
    // 点、阶数、拟合公差
    {
        // 点
        AcGePoint3d pt1(0, 0, 0);
        AcGePoint3d pt2(10, 10, 0);
        AcGePoint3d pt3(20, 0, 0);
        AcGePoint3d pt4(30, 10, 0);
        AcGePoint3dArray pts;
        pts.append(pt1);
        pts.append(pt2);
        pts.append(pt3);
        pts.append(pt4);

        // 阶数
        // 不指定默认就是 4 阶，阶数越高，曲线越光滑，但计算量更大
        int order = 4;

        // 拟合公差
        // 非负值，不指定默认也为 0
        // 值越小，越是尽可能地通过指定点
        // 值越大，越平滑，但是可能偏离控制点
        double fitTolerance = 0;

        AcDbSpline* pSplineObj = new AcDbSpline(pts, order, fitTolerance);
        Spline::drawSpline(pSplineObj);
        pSplineObj->close();
    }
}