c#造个轮子-取色器TakeColor（附源码）

缘由

 看过上篇文章《OpenCvSharp基于颜色反差规避FBA面单贴标（2）》的都应该有印象这么一行代码：

// 面单颜色列表（十六进制格式）   privatestaticreadonly List<string> LabelColors = new List<string>  {       "#7C7C7C", "#707070", "#5E5E5E", "#8F8F8D", "#5F5F5F", "#CBCBC9","#FFFFFF","#FEFEFE","#FCFCFC" ,"#7B7B7B","#828282","#7D7D7D","#787878","#D7D7D5","#777777","#7F7F7F"   }; 

　　 每次有不同颜色或者无法定位的面单，都需要人工补录面单的背景色HEX，那么能不能集成一个工具，自动吸取图片色号保存后，这里能立即生效呢？答案是肯定的！先看看动态效果图：

1. 点击取色，跟随鼠标实时显示背景色便于定位

2. 快捷键Alt+C,抓取当前鼠标所在背景色存储到列表并存储到根目录colorHistory.json文件，便于其他地方读取

3. 列表支持右键删除错误颜色（如下图）

4. 其他地方读取抓取的颜色列表

 保存的json文件格式如下:

[   "#018DBE", "#B1C681", "#03231E", "#61CB81", "#00424A", "#B5BD68", "#A3D9A3", "#F68A1E", "#0E83BA", "#861B2D", "#059BBC" ] 

　　每次抓取都会往json存储当前最新色号，然后其他地方实时读取json即可:

//// 面单颜色列表（十六进制格式）   //private static readonly List<string> LabelColors = new List<string> //{ //    "#7C7C7C", "#707070", "#5E5E5E", "#8F8F8D", "#5F5F5F", "#CBCBC9","#FFFFFF","#FEFEFE","#FCFCFC" ,"#7B7B7B","#828282","#7D7D7D","#787878","#D7D7D5","#777777","#7F7F7F" //}; static List<string> LabelColors = new List<string>(); privatestatic List<string> LoadColorList()   {       try       {           string historyFilePath = System.Windows.Forms.Application.StartupPath + @"colorHistory.json";           if (File.Exists(historyFilePath))           {               string json = File.ReadAllText(historyFilePath);               var hexList = JsonSerializer.Deserialize<List<string>>(json);                 foreach (var hex in hexList)               {                   if (!string.IsNullOrEmpty(hex))                   {                       LabelColors.Add(hex);                   }               }               return LabelColors;           }       }       catch (Exception ex)       {           MessageBox.Show($"加载历史记录失败: {ex.Message}", "错误",               MessageBoxButtons.OK, MessageBoxIcon.Error);       }       returnnull;   } 

　　

private List<Color> colorHistory = new List<Color>();   private MagnifierForm magnifierForm;    privatestring historyFilePath = "colorHistory.json";   private ContextMenuStrip historyContextMenu; 

　　

// 初始化右键菜单    privatevoidInitializeContextMenu()    {        historyContextMenu = new ContextMenuStrip();          ToolStripMenuItem deleteItem = new ToolStripMenuItem("删除选中颜色");        deleteItem.Click += DeleteItem_Click;          ToolStripMenuItem clearAllItem = new ToolStripMenuItem("清空所有历史");        clearAllItem.Click += ClearAllItem_Click;          ToolStripMenuItem copyItem = new ToolStripMenuItem("复制颜色值");        copyItem.Click += CopyItem_Click;          historyContextMenu.Items.AddRange(new ToolStripItem[] {        copyItem, deleteItem, clearAllItem           });          lstHistory.ContextMenuStrip = historyContextMenu;        LoadColorHistory();        // 设置ListBox为自绘模式        lstHistory.DrawMode = DrawMode.OwnerDrawFixed;        lstHistory.DrawItem += LstHistory_DrawItem;    } 

　　ListBox实时显示当前吸取的背景色，重绘代码如下:

// 绘制ListBox项 privatevoidLstHistory_DrawItem(object sender, DrawItemEventArgs e)  {      if (e.Index < 0 || e.Index >= colorHistory.Count) return;        e.DrawBackground();        Color color = colorHistory[e.Index];      string text = $"{ColorToHex(color)} - RGB({color.R},{color.G},{color.B})";        // 绘制颜色块      Rectangle colorRect = new Rectangle(e.Bounds.Left + 2, e.Bounds.Top + 2, 20, e.Bounds.Height - 4);      using (SolidBrush brush = new SolidBrush(color))      {          e.Graphics.FillRectangle(brush, colorRect);      }      e.Graphics.DrawRectangle(Pens.Black, colorRect);        // 绘制文本      Rectangle textRect = new Rectangle(e.Bounds.Left + 25, e.Bounds.Top, e.Bounds.Width - 25, e.Bounds.Height);      using (SolidBrush textBrush = new SolidBrush(e.ForeColor))      {          e.Graphics.DrawString(text, e.Font, textBrush, textRect);      }        e.DrawFocusRectangle();  } 

　　RGB和HEX 相互转换

// HEX字符串转Color   private Color HexToColor(string hex)   {       try       {           // 移除#号           hex = hex.Replace("#", "");             // 处理3位HEX           if (hex.Length == 3)           {               hex = $"{hex[0]}{hex[0]}{hex[1]}{hex[1]}{hex[2]}{hex[2]}";           }             // 处理6位HEX           if (hex.Length == 6)           {               byte r = Convert.ToByte(hex.Substring(0, 2), 16);               byte g = Convert.ToByte(hex.Substring(2, 2), 16);               byte b = Convert.ToByte(hex.Substring(4, 2), 16);               return Color.FromArgb(r, g, b);           }             return Color.Empty;       }       catch       {           return Color.Empty;       }   }   // 颜色转HEX privatestringColorToHex(Color color)   {       return$"#{color.R:X2}{color.G:X2}{color.B:X2}";   } 

　　

结束语

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