* UILineChart: 显示点的颜色支持自定义

SunnyUI.Demo/Charts/FLineChart.cs

@@ -48,7 +48,6 @@ namespace Sunny.UI.Demo
             series.Symbol = UILinePointSymbol.Star;
             series.SymbolSize = 4;
             series.SymbolLineWidth = 2;
-            series.SymbolColor = Color.Red;
             series.Smooth = true;
             series.ShowLine = !cbPoints.Checked;
 

SunnyUI/Charts/UILineChart.cs

@@ -22,6 +22,7 @@
  * 2021-06-18: V3.0.4 显示鼠标点格式更新
  * 2021-07-22: V3.0.5 可自定义背景色，增加实时数据的Demo
  * 2021-08-23: V3.0.6 增加可只显示点的模式
+ * 2021-10-02: V3.0.8 支持数据包括Nan
 ******************************************************************************/
 
 using System;
@@ -450,7 +451,7 @@ namespace Sunny.UI
             foreach (var series in Option.Series.Values)
             {
                 Color color = series.Color;
-                if (!series.CustomColor) color = ChartStyle.GetColor(idx);
+                if (series.SymbolColor.IsValid()) color = series.SymbolColor;
 
                 if (series.Symbol != UILinePointSymbol.None)
                 {

SunnyUI/Charts/UILineChartOption.cs

@@ -280,7 +280,7 @@ namespace Sunny.UI
 
         public int SymbolLineWidth { get; set; } = 1;
 
-        public Color SymbolColor { get; set; }
+        public Color SymbolColor { get; set; } = Color.Empty;
 
         public bool CustomColor { get; set; }
 
@@ -355,6 +355,8 @@ namespace Sunny.UI
         public void Clear()
         {
             ContainsNan = false;
+            SymbolColor = Color.Empty;
+
             XData.Clear();
             YData.Clear();
             ClearPoints();