MxDrawUtility mxUtility = new MxDrawUtility(); object getPt; MxDrawEntity ent = mxUtility.GetEntity(out getPt, "选择打断的曲线:"); if (ent == null) return; MxDrawCurve curve; if (ent is MxDrawCurve) { curve = (MxDrawCurve)ent; } else { MessageBox.Show("实体类型不对"); return; } double dLen = 0.0; curve.GetDistAtParam(curve.GetEndParam(),out dLen); object pt1; if (!curve.GetPointAtDist(dLen / 4.0, out pt1)) return; object pt2; if (!curve.GetPointAtDist(dLen * 3.0 / 4.0, out pt2)) return; MxDrawPoint breakPt1 = (MxDrawPoint)pt1; MxDrawPoint breakPt2 = (MxDrawPoint)pt2; if (breakPt1 == null || breakPt2 == null) return; MxDrawResbuf param = new MxDrawResbuf(); param.AddPoint(breakPt1, -10); param.AddPoint(breakPt2, -10); object objIds; if (curve.SplitCurves(param, out objIds)) { MxDrawResbuf rbId = (MxDrawResbuf)objIds; if(rbId.Count == 3) { axMxDrawX1.Erase(rbId.AtLong(1)); } // 把以前的删除掉。 ent.Erase(); } | 
