c#造個輪子-取色器TakeColor（附源碼）

緣由

看過上篇文章《OpenCvSharp基于顏色反差規避FBA面單貼標（2）》的都應該有印象這么一行代碼：

// 面單顏色列表（十六進制格式）  
privatestaticreadonly List<string> LabelColors = new List<string> 
{     
 "#7C7C7C", "#707070", "#5E5E5E", "#8F8F8D", "#5F5F5F", "#CBCBC9","#FFFFFF","#FEFEFE","#FCFCFC" ,"#7B7B7B","#828282","#7D7D7D","#787878","#D7D7D5","#777777","#7F7F7F"  
};

　　每次有不同顏色或者無法定位的面單，都需要人工補錄面單的背景色HEX，那么能不能集成一個工具，自動吸取圖片色號保存后，這里能立即生效呢？答案是肯定的！先看看動態效果圖：

123123

點擊取色，跟隨鼠標實時顯示背景色便于定位
快捷鍵Alt+C,抓取當前鼠標所在背景色存儲到列表并存儲到根目錄colorHistory.json文件，便于其他地方讀取
列表支持右鍵刪除錯誤顏色（如下圖）
其他地方讀取抓取的顏色列表

保存的json文件格式如下:

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

　　每次抓取都會往json存儲當前最新色號，然后其他地方實時讀取json即可:

//// 面單顏色列表（十六進制格式）
  //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($"加載歷史記錄失敗: {ex.Message}", "錯誤",
              MessageBoxButtons.OK, MessageBoxIcon.Error);
      }
      returnnull;
  }

　　 116076-20250310125032345-1793233350[1]

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

// 初始化右鍵菜單
   privatevoidInitializeContextMenu()
   {
       historyContextMenu = new ContextMenuStrip();
 
       ToolStripMenuItem deleteItem = new ToolStripMenuItem("刪除選中顏色");
       deleteItem.Click += DeleteItem_Click;
 
       ToolStripMenuItem clearAllItem = new ToolStripMenuItem("清空所有歷史");
       clearAllItem.Click += ClearAllItem_Click;
 
       ToolStripMenuItem copyItem = new ToolStripMenuItem("復制顏色值");
       copyItem.Click += CopyItem_Click;
 
       historyContextMenu.Items.AddRange(new ToolStripItem[] {
       copyItem, deleteItem, clearAllItem
          });
 
       lstHistory.ContextMenuStrip = historyContextMenu;
       LoadColorHistory();
       // 設置ListBox為自繪模式
       lstHistory.DrawMode = DrawMode.OwnerDrawFixed;
       lstHistory.DrawItem += LstHistory_DrawItem;
   }

　　ListBox實時顯示當前吸取的背景色，重繪代碼如下:

// 繪制ListBox項
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})";
 
     // 繪制顏色塊
     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);
 
     // 繪制文本
     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 相互轉換

// HEX字符串轉Color
  private Color HexToColor(string hex)
  {
      try
      {
          // 移除#號
          hex = hex.Replace("#", "");
 
          // 處理3位HEX
          if (hex.Length == 3)
          {
              hex = $"{hex[0]}{hex[0]}{hex[1]}{hex[1]}{hex[2]}{hex[2]}";
          }
 
          // 處理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;
      }
  }
 
// 顏色轉HEX
privatestringColorToHex(Color color)
  {
      return$"#{color.R:X2}{color.G:X2}{color.B:X2}";
  }

結束語

感謝各位耐心查閱！如果您有更好的想法歡迎一起交流，有不懂的也可以微信公眾號聯系博主，作者公眾號會經常發一些實用的小工具和demo源碼，需要的可以去看看！另外，如果覺得本篇博文對您或者身邊朋友有幫助的，麻煩點個關注！贈人玫瑰，手留余香，您的支持就是我寫作最大的動力，感謝您的關注，期待和您一起探討！再會！(公眾號回復“takecolor”獲取完整代碼)

posted @ 2025-09-28 19:04 何以解憂唯有*碼閱讀(437) 評論(2) 收藏舉報

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何以解憂唯有*碼

c#造個輪子-取色器TakeColor（附源碼）

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