主要思路：找到填充边界集合：vecBo，然后把面积最大的边界找出来：bo1，用分割曲线和bo1通过boundary命令构成两个新的最大封闭边界，左边的记为 boLeft（红色部分），右边的记为boRight（绿色部分），在vecBo边界集合分开为：boLeft内部的边界，和boRight内部的边界。这样在分别填充的时候，就能有正确的填充边界集合。
下面放出代码：
通过选择填充求得填充边界集合：
static void GetHatchBo(AcDbHatch *pHatch,vector<AcDbEntity*>&vecBo) { Acad::ErrorStatus es; Adesk::Int32 LoopType; AcGeVoidPointerArray edgeptrAry; AcGeIntArray edgeTypesAry; AcGePoint2dArray vertices; AcGeDoubleArray bulges; //获得填充边界的数目 int LoopNum = pHatch->numLoops(); for (int i = 0; i < LoopNum; i++) { //获取边界类型 LoopType = pHatch->loopTypeAt(i); //如果边界是多义线 if (LoopType & AcDbHatch::kPolyline) { //取得边界定义数据(polyline)的顶点数组和凸度数组，它们是一一对应的 es = pHatch->getLoopAt(i, LoopType, vertices, bulges); acutPrintf(L"\n多段线"); //是不是根据这些顶点数组和凸度数组构造一条AcDb多义线取决于你 AcDbPolyline *pl = new AcDbPolyline(); GetPolyline(vertices, bulges, pl); vecBo.push_back(pl); } else { //几乎可以取得除polyline外的所有边界定义数据 //第三个参数返回值是无值指针数组 //第四个参数返回值是组成边界的每一条边的类型 //它们也是一一对应的关系 es = pHatch->getLoopAt(i, LoopType, edgeptrAry, edgeTypesAry); //遍历，因为每一条边界又可能由多种AcGe曲线构成 for (int j = 0; j < edgeTypesAry.length(); j++) { if (edgeTypesAry[j] == AcDbHatch::kLine)//直线 { AcGeLineSeg2d *LnSeg = (AcGeLineSeg2d *)edgeptrAry[j]; acutPrintf(L"\n直线"); AcGePoint2d pt1 = LnSeg->startPoint(); AcGePoint2d pt2 = LnSeg->endPoint(); AcDbLine *line = new AcDbLine(AcGePoint3d(pt1.x,pt1.y,0), AcGePoint3d(pt2.x, pt2.y, 0)); vecBo.push_back(line); } //圆弧 else if (edgeTypesAry[j] == AcDbHatch::kCirArc) { AcGeCircArc2d *cirArc = (AcGeCircArc2d *)edgeptrAry[j]; acutPrintf(L"\n圆弧"); //可以根据数学圆弧构造相应的AcDb圆弧，取决于你（以下同） AcGePoint2d center = cirArc->center(); double ra = cirArc->radius(); double angle1 = cirArc->startAng(); double angle2 = cirArc->endAng(); AcDbCircle *cir = new AcDbCircle(AcGePoint3d(center.x, center.y, 0), AcGeVector3d::kZAxis, ra); vecBo.push_back(cir); } else if (edgeTypesAry[j] == AcDbHatch::kEllArc)//椭圆弧 { AcGeEllipArc2d *ellArc = (AcGeEllipArc2d *)edgeptrAry[j]; acutPrintf(L"\n椭圆弧"); AcGePoint2d center = ellArc->center(); AcGeVector2d majorVec = ellArc->majorAxis(); double angle1 = ellArc->startAng(); double angle2 = ellArc->endAng(); double rad = ellArc->majorRadius(); double rad2 = ellArc->minorRadius(); AcDbEllipse *ell = new AcDbEllipse(AcGePoint3d(center.x, center.y, 0), AcGeVector3d::kZAxis, AcGeVector3d(majorVec.x,majorVec.y,0), rad / rad2, angle1, angle2); vecBo.push_back(ell); } else if (edgeTypesAry[j] == AcDbHatch::kSpline)//NURBS曲线 { AcGeNurbCurve2d *spline = (AcGeNurbCurve2d *)edgeptrAry[j]; acutPrintf(L"\nNURBS曲线"); AcDbSpline * spl = NULL; createSpline(*spline, spl, 0); vecBo.push_back(spl); } } } vertices.removeAll(); bulges.removeAll(); edgeptrAry.removeAll(); edgeTypesAry.removeAll(); } }