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如果有n-1个矩形被框选，第n个矩形没被全部选中时，也会选中。

支持将图片作为填充属性

支持图形缩放

当不能再撤销重做时，右键菜单的 撤销重做 选项不可用。

• 图形类改造。x、y、width、height 变成计算属性了 很多逻辑都要改成 递归逻辑。比如 渲染的时候，遇到 group 时，需要递归，注意需要是深度遍历，且为后序遍历，以保证渲染顺序
• 编组的旋转
• 编组的移动
• 实现 group 命令
  • do（有问题）
  • undo
• 更改渲染逻辑，需要处理树形嵌套结构
• UI 支持 tree 结构
  • 支持折叠
  • 支持基本的显示
• 实现 ungroup 命令
  • do
  • undo
• 实现编组正确的选择包围盒

• Support Select element by click layer item.

• #87
• Change object layout by drag and drop
• visible / hide
• #88

At the beginning, we will first implement a read-only version of the layer panel, which will help us better understand the hierarchy of the graphics tree.

just like this!

• locked graph can not be selected and moved by select tool
• locked graph can not be selected by "Select All"
• but you can select locked by left layout panel, and then change attrs by info panel
• locked graph hide transform point(rotation and resize) when selected

• set any zoom
• zoom 100%, 50%, 200%

• draw path tool #126
• anchor / control select tool
  • support move anchor #127
  • support move handleIn and handleOn
• close path #128
• double click to active path editor #130
• select box #131