添加线条的顶端圆圈
Merge branch 'feature/linedel' into dev
Merge branch 'sx_func' of https://github.com/lln7777/zhuyun into dev
fix bug
Merge branch 'dev' of https://github.com/lln7777/zhuyun into sx_func
添加删除线条的入口，以及删除线条