如何求实体的交点？

• 回答：

          private void testIntersectWith()
          {
              // 选择实体。]
              axMxDrawX1.Prompt("选择求交实体.");
              MxDrawSelectionSet ss = new MxDrawSelectionSet();
              ss.Select(MCAD_McSelect.mcSelectionSetUserSelect, null, null);
              if (ss.Count == 0)
                  return;
  
              if (ss.Count == 1)
              {
                  MessageBox.Show("选择两个实体");
                  return;
              }
  
              MxDrawEntity ent0 = (MxDrawEntity)ss.Item(0);
              MxDrawEntity ent1 = (MxDrawEntity)ss.Item(1);
  
              MxDrawPoints pts = ent0.IntersectWith(ent1, MCAD_McExtendOption.mcExtendNone);
              if (pts.Count == 0)
                  return;
              for (int i = 0; i < pts.Count; i++)
              {
                  MxDrawPoint pt = pts.Item(i);
                  axMxDrawX1.DrawVectorCircle(pt.x, pt.y, 100, 255);
              }
  
          }