注释功能

1. 文本注释(Text annotation) - yes
2. 链接注释(Link annotation ) - yes
3. 自由文本注释(Free text annotation) - yes
4. 线条注释(Line annotation) - yes
5. 方形注释(Square annotation) - yes
6. 圆形注释(Circle annotation) - yes
7. 多边形注释(Polygon annotation) - yes
8. 折线注释(Polyline annotation) - yes
9. 高亮注释(Highlight annotation) - yes
10. 下划线注释(Underline annotation) - yes
11. 波浪下划线注释(Squiggly-underline annotation) - yes
12. 删除线注释(Strikeout annotation) - yes
13. 橡皮图章注释(Rubber stamp annotation)
14. 向上尖括号注释(Caret annotation) - yes
15. 做图注释(Ink annotation) - yes
16. 弹出框注释(Pop-up annotation) - yes
17. 文件附件注释(File attachment annotation) - yes
18. 声音注释(Sound annotation)
19. 视频注释(Movie annotation)
20. 小组件注释(Widget annotation) - yes
21. 屏幕注释(Screen annotation)
22. 印刷标记注释(Printer’s mark annotation)
23. TrapNet(Trap network annotation)
24. 水印注释(Watermark annotation)
25. 3D注释(3D annotation)