直方图将柱状图替换为面积图，优化密集数据显示效果，Y轴刻度自动取整支持 K/M 缩写，X 轴根据数据范围自动设置。

2026-05-21 10:37:28 +08:00
parent ef83a7637a
commit d7c027b732
3 changed files with 131 additions and 20 deletions
@@ -0,0 +1,49 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace XP.Common.Controls.ImageHistogram
+{
+    /// <summary>
+    /// 频次标签转换器：将大数值转为 K/M 缩写格式 | Frequency label converter: converts large values to K/M abbreviation format
+    /// 例如：500000 → "500K"，1500000 → "1.5M"，800 → "800"
+    /// </summary>
+    internal sealed class FrequencyLabelConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value == null) return "0";
+
+            double num;
+            if (value is double d)
+                num = d;
+            else if (value is decimal dec)
+                num = (double)dec;
+            else if (!double.TryParse(value.ToString(), out num))
+                return value.ToString() ?? "0";
+
+            if (num >= 1_000_000)
+            {
+                double mValue = num / 1_000_000.0;
+                return mValue == Math.Floor(mValue)
+                    ? $"{(int)mValue}M"
+                    : $"{mValue:0.#}M";
+            }
+
+            if (num >= 1_000)
+            {
+                double kValue = num / 1_000.0;
+                return kValue == Math.Floor(kValue)
+                    ? $"{(int)kValue}K"
+                    : $"{kValue:0.#}K";
+            }
+
+            return $"{(int)num}";
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}