* UIBarChart：更改Y轴坐标刻度小数位自动计算

SunnyUI.Demo/Charts/FBarChart.cs

@@ -26,20 +26,20 @@ namespace Sunny.UI.Demo.Charts
 
             var series = new UIBarSeries();
             series.Name = "Bar1";
-            series.AddData(11);
+            series.AddData(1.1);
-            series.AddData(15);
+            series.AddData(1.5);
-            series.AddData(12);
+            series.AddData(1.2);
-            series.AddData(14);
+            series.AddData(1.4);
-            series.AddData(13);
+            series.AddData(1.3);
             option.Series.Add(series);
 
             series = new UIBarSeries();
             series.Name = "Bar2";
-            series.AddData(-22);
+            series.AddData(-2.2);
-            series.AddData(-28);
+            series.AddData(-2.8);
-            series.AddData(-25);
+            series.AddData(-2.5);
-            series.AddData(-23);
+            series.AddData(-2.3);
-            series.AddData(-24);
+            series.AddData(-2.4);
             option.Series.Add(series);
 
             option.XAxis.Data.Add("Mon");

SunnyUI.Demo/Charts/FBarChartEx.cs

@@ -47,24 +47,24 @@ namespace Sunny.UI.Demo
             series.Name = "Bar1";
             series.ShowBarName = true;
             series.ShowValue = true;
-            series.AddData("通道1", 11);
+            series.AddData("通道1", 1.1);
-            series.AddData("通道2", 15);
+            series.AddData("通道2", 1.5);
             option.Series.Add(series);
 
             series = new UIBarSeries();
             series.Name = "Bar2";
             series.ShowBarName = true;
             series.ShowValue = true;
-            series.AddData("通道1", 22);
+            series.AddData("通道1", 2.2);
-            series.AddData("通道2", 28);
+            series.AddData("通道2", 2.8);
-            series.AddData("通道3", 25);
+            series.AddData("通道3", 2.5);
             option.Series.Add(series);
 
             series = new UIBarSeries();
             series.Name = "Bar3";
             series.ShowBarName = true;
             series.ShowValue = true;
-            series.AddData("通道1", 7);
+            series.AddData("通道1", 0.7);
             option.Series.Add(series);
 
             option.XAxis.Data.Add("Mon");

SunnyUI/Charts/UIBarChart.cs

@@ -53,7 +53,7 @@ namespace Sunny.UI
         /// <param name="degree_end">刻度结束值，须乘以间隔使用</param>
         /// <param name="degree_gap">刻度间隔</param>
         public void CalcDegreeScale(double start, double end, int expect_num,
-            out int degree_start, out int degree_end, out double degree_gap)
+            out int degree_start, out int degree_end, out double degree_gap, out int decimalCount)
         {
             if (start >= end)
             {
@@ -101,6 +101,10 @@ namespace Sunny.UI
             }
 
             degree_end = end2;
+            _exponent = Math.Abs(_exponent);
+            if (fix_step.IsEven()) _exponent--;
+            if (_exponent < 0) _exponent = 0;
+            decimalCount = _exponent;
         }
 
         protected override void CalcData()
@@ -142,11 +146,12 @@ namespace Sunny.UI
             }
 
             CalcDegreeScale(min, max, Option.YAxis.SplitNumber,
-                out int start, out int end, out double interval);
+                out int start, out int end, out double interval, out int decimalCount);
 
             YAxisStart = start;
             YAxisEnd = end;
             YAxisInterval = interval;
+            YAxisDecimalCount = decimalCount;
 
             float x1 = DrawBarWidth / (Option.SeriesCount * 2 + Option.SeriesCount + 1);
             float x2 = x1 * 2;
@@ -250,6 +255,7 @@ namespace Sunny.UI
         protected int YAxisStart;
         protected int YAxisEnd;
         protected double YAxisInterval;
+        protected int YAxisDecimalCount;
         protected readonly ConcurrentDictionary<int, List<BarInfo>> Bars = new ConcurrentDictionary<int, List<BarInfo>>();
 
         [DefaultValue(-1), Browsable(false)]
@@ -501,6 +507,10 @@ namespace Sunny.UI
                 float DrawBarHeight = DrawSize.Height * 1.0f / (YAxisEnd - YAxisStart);
                 int idx = 0;
                 float wmax = 0;
+
+                if (Option.YAxis.AxisLabel.AutoFormat)
+                    Option.YAxis.AxisLabel.DecimalCount = YAxisDecimalCount;
+
                 for (int i = YAxisStart; i <= YAxisEnd; i++)
                 {
                     string label = Option.YAxis.AxisLabel.GetLabel(i * YAxisInterval, idx);

SunnyUI/Charts/UIBarChartEx.cs

@@ -74,11 +74,12 @@ namespace Sunny.UI
             }
 
             CalcDegreeScale(min, max, Option.YAxis.SplitNumber,
-                out int start, out int end, out double interval);
+                out int start, out int end, out double interval, out int decimalCount);
 
             YAxisStart = start;
             YAxisEnd = end;
             YAxisInterval = interval;
+            YAxisDecimalCount = decimalCount;
             float barX = DrawOrigin.X;
 
             if (Option.AutoSizeBars)
@@ -460,6 +461,10 @@ namespace Sunny.UI
                 float DrawBarHeight = DrawSize.Height * 1.0f / (YAxisEnd - YAxisStart);
                 int idx = 0;
                 float wmax = 0;
+
+                if (Option.YAxis.AxisLabel.AutoFormat)
+                    Option.YAxis.AxisLabel.DecimalCount = YAxisDecimalCount;
+
                 for (int i = YAxisStart; i <= YAxisEnd; i++)
                 {
                     string label = Option.YAxis.AxisLabel.GetLabel(i * YAxisInterval, idx);

SunnyUI/Charts/UIBarChartOption.cs

@@ -177,6 +177,11 @@ namespace Sunny.UI
             return value.ToString("F2");
         }
 
+        public string GetAutoLabel(double value, int decimalCount)
+        {
+            return value.ToString("F" + decimalCount);
+        }
+
         /// <summary>
         /// 小数位个数，Formatter不为空时以Formatter为准
         /// </summary>
@@ -186,6 +191,8 @@ namespace Sunny.UI
         /// 日期格式化字符串，Formatter不为空时以Formatter为准
         /// </summary>
         public string DateTimeFormat { get; set; } = "HH:mm";
+
+        public bool AutoFormat { get; set; } = true;
     }
 
     public class UIAxisTick