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

　　

结束语

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