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lmj01 · Jan 9, 2024 · 07a0aee · 07a0aee
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diff --git a/articles/2023/associateEditor.md b/articles/2023/associateEditor.md
@@ -6,6 +6,7 @@
 
 ### CRDT
 > CRDT 的正式定义出现在 Marc Shapiro 2011 年的论文Conflict-free replicated data types中(而2006 的Woot可能是最早的研究)。提出的动机是因为最终一致性(Eventual Consistency) 的冲突解决设计很困难，很少有文章给出设计指导建议，而随意的设计的方案容易出错。所以这篇文章提出了简单的、理论证明的方式来达到最终一致性，也就是 CRDT。
+>> 高性能库[Y.js Shared data types for building collaborative software ](https://github.com/yjs/yjs)
 
 CRDT(conflict-free replicated data type)无冲突复制数据类型,是一种可以在网络中的多台计算机上复制的数据结构,副本可以独立和并行更新,不需要在副本之间协调,并保证不会有冲突.
 

diff --git a/articles/2023/fractionalIndexing.md b/articles/2023/fractionalIndexing.md
@@ -2,6 +2,13 @@
 
 小数索引技术
 
+图形对象会使用 index 属性表示顺序，记录自己在同级图形中的位置, index的值为0到1，不包含边界值，
+
+figma处理时丢掉前面的0.，把小数部分转换为ascii中可打印的字符，共95个。 如0.2，0.3，之间就是0.25。 如果只是这样算，就想得太轻松了，数值计算从来不是小事。
+
+精度问题，两个小数之间求中间点，多进行几次就会造成误差，与预期的产生错觉, 当然可以根据使用场景实际判断是否更改。
+
+针对这个问题，就是用无限精度的类型，字符串来表示。可参考[David Greenspan](https://observablehq.com/@dgreensp/implementing-fractional-indexing)，有人根据他的文章写了一个[npm库](https://github.com/rocicorp/fractional-indexing)
 
 ## 参考
 

diff --git a/articles/CAD.md → cg/tools/CAD.md b/articles/CAD.md → cg/tools/CAD.md
diff --git a/dev-note/buildSystem.md b/dev-note/buildSystem.md
@@ -0,0 +1,16 @@
+# BuildSystem
+> 构建系统，把源码编译成目标对象，都需要使用构建系统来帮助
+
+
+## [CMake](https://cmake.org/)
+> CMake is the de-facto standard for building C++ code, with over 2 million downloads a month. It’s a powerful, comprehensive solution for managing the software build process. Get everything you need to successfully leverage CMake by visiting our resources section.
+
+## [The Meson Build system](https://mesonbuild.com/)
+> Meson® is a project to create the best possible next-generation build system. 
+
+[github](https://github.com/mesonbuild/meson)
+
+## [Ninja](https://ninja-build.org/)
+> Ninja is a small build system with a focus on speed
+
+[github](https://github.com/ninja-build/ninja)
diff --git a/index/article.md b/index/article.md
@@ -18,6 +18,7 @@
 - [cmd](../dev-note/cmd.md)
 - [bazel](../dev-note/bazel.md)
 - [Mathjax](../articles/mathjax.md)
+- [build System](../dev-note/buildSystem.md)
 
 
 ### web

diff --git a/index/computerScience.md b/index/computerScience.md
@@ -55,7 +55,7 @@
 - [LNLib is a C++ NURBS Algorithms Library. These algorithms are primary referenced from The NURBS Book 2nd Edition. ](https://github.com/BIMCoderLiang/LNLib)
 
 ### CAD
-
+- [CAD相关笔记](../cg/tools/CAD.md)
 - [FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size](https://github.com/FreeCAD/FreeCAD)
 
 ### api