如何求曲线的交点？

• 回答：

          private void IntersectPoint()
          {
              MxDrawUtility mxUtility = new MxDrawUtility();
              MxDrawPoint getPt;
              MxDrawEntity ent1 = mxUtility.GetEntity(out getPt, "\n 曲线1:");
  
              if (ent1 == null)
              {
                  MessageBox.Show("没有曲线1..");
                  return;
              }
  
  
              MxDrawEntity ent2 = mxUtility.GetEntity(out getPt, "\n 曲线2:");
  
              if (ent2 == null)
              {
                  MessageBox.Show("没有曲线2..");
                  return;
              }
  
              MxDrawPoints points = (MxDrawPoints)ent1.IntersectWith(ent2, MCAD_McExtendOption.mcExtendNone);
  
              if(points.Count == 0)
              {
                  MessageBox.Show("没有求到交点");
              }
              else
              {
                  MxDrawPoint pt = points.Item(0);
  
                  MessageBox.Show("交点为:" + pt.x + "," + pt.y);
  
  
              }
  
          }