重构代码，将与绘制相关的Color改为Color32，减少隐式转换

Assets/XCharts/Documentation/XCharts问答.md

@@ -32,6 +32,7 @@
 [QA 26：如何使用背景组件？有什么条件限制？](#如何使用背景组件？有什么条件限制)  
 [QA 27：Mesh can not have more than 65000 vertices?](#Mesh_cannot_have_more_than_65000_vertices)  
 [QA 28：为什么serie里设置的参数运行后又被重置了?](#为什么serie里设置的参数运行后又被重置了)  
+[QA 29：为什么升级到1.6.0版本后很多自定义颜色丢失了?应该如何升级？](#为什么升级到1.6.0版本后很多自定义颜色丢失了?应该如何升级)  
 
 ## 如何调整坐标轴与背景的边距
 
@@ -149,6 +150,16 @@
 
 答：检测下代码里是否调用了`RemoveData()`并重新添加`Serie`了。如果想保留`Serie`的配置可以只`ClearData()`，然后重新添加数据。
 
+## 为什么升级到1.6.0版本后很多自定义颜色丢失了?应该如何升级
+
+答：1.6.0版本为了减少隐式转换，将所有的绘制相关的`Color`都改为了`Color32`，所以会导致一些自定义的颜色的丢失。影响到的主要组件有：`ItemStyle`，`LineStyle`，`AreaStyle`，`Vessel`，`VisualMap`，`AxisSplitArea`，`AxisSplitLine`，`GaugeAxis`，`SerieLabel`等。可以用脚本[UpgradeChartColor.cs](https://github.com/monitor1394/unity-ugui-XCharts/blob/master/Assets/XCharts/Editor/Tools/UpgradeChartColor.cs)进行升级。
+升级步骤如下：
+1. 备份项目。
+2. 下载或拷贝脚本[UpgradeChartColor.cs](https://github.com/monitor1394/unity-ugui-XCharts/blob/master/Assets/XCharts/Editor/Tools/UpgradeChartColor.cs)放到旧项目的`Editor`下，将里面编译报错的`color`字段改为`Color.clear`（因为旧版本可能有些字段还不存在）。
+3. 编译通过后，通过`菜单栏->XCharts->ExportColorConfig`导出旧版本的颜色配置文件（配置文件默认保存到`Assets`下的`color.config`）。
+4. 升级`XCharts`到最新版本。
+5. 通过`菜单栏->XCharts->ImportColorConfig`将`color.config`导入即可恢复自定义的颜色（如果`color.config`不在升级后的项目的`Assets`下的话需要拷贝到此目录下）。
+
 [返回首页](https://github.com/monitor1394/unity-ugui-XCharts)  
 [XChartsAPI接口](XChartsAPI.md)  
 [XCharts配置项手册](XCharts配置项手册.md)

Assets/XCharts/Documentation/xcharts-questions-and-answers-EN.md

@@ -32,6 +32,7 @@
 [QA 26: How do I use the background component? What are the conditions?](#How-do-I-use-the-background-component-What-are-the-conditions)  
 [QA 27: Mesh can not have more than 65000 vertices?](#Mesh-cannot-have-more-than-65000-vertices)  
 [QA 28: Why are the parameters set in Serie reset after they run?](#Why-are-the-parameters-set-in-Serie-reset-after-they-run)  
+[QA 29: Why are many custom colors lost after upgrading to 1.6.0? How should I upgrade?](#Why_are_many_custom_colors_lost_after_upgrading_to_1.6.0_How_should_I_upgrade)  
 
 ## How-to-adjust-the-margin-between-the-axis-and-the=-background
 
@@ -145,6 +146,16 @@ A: This is the limit of `UGUI` on the number of vertices for a single `Graphic`.
 
 A: Check whether `RemoveData()` and add new `Serie` in the code. If you want to keep the configuration of `Serie`, you can only `ClearData()` which just clear data and then readd the data to the old serie.
 
+## Why_are_many_custom_colors_lost_after_upgrading_to_1.6.0_How_should_I_upgrade
+
+A: In version `1.6.0`, in order to reduce implicit conversion, all drawing related `Color` was changed to `Color32`, so some custom colors were lost. The main components affected are: `ItemStyle`, `LineStyle`, `AreaStyle`, `Vessel`, `VisualMap`, `AxisSplitArea`, `AxisSplitLine`, `GaugeAxis`,`SerieLabel`, etc. Can use the script [UpgradeChartColor.cs](https://github.com/monitor1394/unity-ugui-XCharts/blob/master/Assets/XCharts/Editor/Tools/UpgradeChartColor.cs) to upgrade.
+The upgrade steps are as follows:
+1. Back up the project.
+2. Download or copy the script [UpgradeChartColor.cs](https://github.com/monitor1394/unity-ugui-XCharts/blob/master/Assets/XCharts/Editor/Tools/UpgradeChartColor.cs) in the old project `Editor`, Change the `color` field inside to `color.clear` (because some fields may not exist in the old version).
+3. After compilation, the old version of color configuration file is exported through `menu bar -> XCharts-> ExportColorConfig` (the configuration file is saved by default to `color.config` under `Assets`).
+4. Upgrade `XCharts` to the latest version.
+5. The custom color can be restored by importing `color.config` through `menu bar -> XCharts-> ImportColorConfig` (if `color.config` is not under `Assets` of the upgraded project, copy it to this directory).
+
 [XCharts Homepage](https://github.com/monitor1394/unity-ugui-XCharts)  
 [XCharts API](xcharts-api-EN.md)  
 [XCharts Configuration](xcharts-configuration-EN.md)