优化PieChart支持设置ignoreValue不显示指定数据

Runtime/Internal/Helper/SerieLabelHelper.cs

@@ -80,6 +80,11 @@ namespace XCharts
             serieData.labelObject.label.fontStyle = label.fontStyle;
         }
 
+        public static bool CanShowLabel(Serie serie, SerieData serieData, SerieLabel label, int dimesion)
+        {
+            return serie.show && serieData.canShowLabel && !serie.IsIgnoreValue(serieData.GetData(dimesion));
+        }
+
         public static string GetFormatterContent(Serie serie, SerieData serieData,
             float dataValue, float dataTotal, SerieLabel serieLabel = null)
         {

Runtime/Internal/Helper/SeriesHelper.cs

@@ -102,6 +102,7 @@ namespace XCharts
                     case SerieType.Ring:
                         for (int i = 0; i < serie.data.Count; i++)
                         {
+                            if (serie.type == SerieType.Pie && serie.IsIgnoreValue(serie.data[i].GetData(1))) continue;
                             if (string.IsNullOrEmpty(serie.data[i].name))
                                 serieNameList.Add(ChartCached.IntToStr(i));
                             else if (!serieNameList.Contains(serie.data[i].name))