Feature - Pan and zoom

[haurs]

Good job on the tree chart @hukaibaihu!

Any chance of adding a pan and zoom feature to it as well? Would be nice when dealing with larger trees where you need zoom out in order for it to fit on the screen.

[ZinLiao]

+1

[PatHuman]

Hi,
here is an example of implementing the Pan and Zoom features.

[qzsee]

https://github.com/PatHuman/vue-org-tree 这个NPM包和你的一样，怎样更新成 pan 和 zoom的 npm包呢

[hukaibaihu]

https://github.com/PatHuman/vue-org-tree 这个NPM包和你的一样，怎样更新成 pan 和 zoom的 npm包呢

请提交PR