增加itemStyle的cornerRadius支持圆角矩形

Runtime/Helper/ItemStyleHelper.cs

@@ -0,0 +1,24 @@
+/******************************************/
+/*                                        */
+/*     Copyright (c) 2018 monitor1394     */
+/*     https://github.com/monitor1394     */
+/*                                        */
+/******************************************/
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace XCharts
+{
+    internal static class ItemStyleHelper
+    {
+        public static bool IsNeedCorner(ItemStyle itemStyle)
+        {
+            if (itemStyle.cornerRadius == null) return false;
+            foreach (var value in itemStyle.cornerRadius)
+            {
+                if (value != 0) return true;
+            }
+            return false;
+        }
+    }
+}

Runtime/Helper/ItemStyleHelper.cs.meta

@@ -0,0 +1,11 @@
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+  defaultReferences: []
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Runtime/Helper/SerieHelper.cs

@@ -233,5 +233,12 @@ namespace XCharts
             else if (serie.lineStyle.width != 0) return serie.lineStyle.width;
             else return 1;
         }
+
+        public static float[] GetSymbolCornerRadius(Serie serie, SerieData serieData, bool highlight)
+        {
+            var itemStyle = GetItemStyle(serie, serieData, highlight);
+            if(itemStyle != null) return itemStyle.cornerRadius;
+            else return null;
+        }
     }
 }