修复Pie无数据时绘制异常的问题

Documentation~/zh/changelog.md

@@ -68,6 +68,7 @@ slug: /changelog
 
 ## master
 
+* (2023.09.16) 修复`Pie`无数据时绘制异常的问题
 * (2023.09.12) 增加`Pie`的`radiusGradient`可设置半径方向的渐变效果
 * (2023.09.05) 优化`LabelLine`的`lineEndX`在`Pie`中的表现
 * (2023.09.05) 修复`TriggerTooltip()`接口对`Ring`无效的问题

Runtime/Serie/Pie/PieHandler.cs

@@ -348,6 +348,16 @@ namespace XCharts.Runtime
                 && !serie.animation.IsFadeIn() && !serie.animation.IsFadeOut();
             var data = serie.data;
             serie.animation.InitProgress(0, 360);
+            if (data.Count == 0)
+            {
+                var itemStyle = SerieHelper.GetItemStyle(serie, null);
+                var fillColor = ChartHelper.IsClearColor(itemStyle.backgroundColor) ?
+                    (Color32)chart.theme.legend.unableColor : itemStyle.backgroundColor;
+                UGL.DrawDoughnut(vh, serie.context.center, serie.context.insideRadius,
+                    serie.context.outsideRadius, fillColor, fillColor, Color.clear, 0,
+                    360, itemStyle.borderWidth, itemStyle.borderColor, serie.gap / 2, chart.settings.cicleSmoothness,
+                    false, true, serie.radiusGradient);
+            }
             for (int n = 0; n < data.Count; n++)
             {
                 var serieData = data[n];

Runtime/Serie/SerieHelper.cs

@@ -201,6 +201,7 @@ namespace XCharts.Runtime
         /// <returns></returns>
         public static bool IsAllZeroValue(Serie serie, int dimension = 1)
         {
+            if (serie.dataCount == 0) return false;
             foreach (var serieData in serie.data)
             {
                 if (serieData.GetData(dimension) != 0) return false;