增加Pie的radiusGradient可设置半径方向的渐变效果

Documentation~/en/configuration.md

@@ -1628,6 +1628,19 @@ Grid component.
 
 > XCharts.Runtime.Pie : [Serie](#serie)
 
+```mdx-code-block
+<APITable name="Pie">
+```
+
+
+|field|default|since|comment|
+|--|--|--|--|
+|radiusGradient|false|v3.8.1|Whether to use gradient color in pie chart.
+
+```mdx-code-block
+</APITable>
+```
+
 ## PolarAxisTheme
 
 > XCharts.Runtime.PolarAxisTheme : [BaseAxisTheme](#baseaxistheme)

Documentation~/zh/changelog.md

@@ -68,6 +68,7 @@ slug: /changelog
 
 ## master
 
+* (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
 * (2023.09.05) 修复`Radar`数据全为0时绘制报错的问题

Documentation~/zh/configuration.md

@@ -1628,6 +1628,19 @@ Drawing grid in rectangular coordinate. Line chart, bar chart, and scatter chart
 
 > XCharts.Runtime.Pie : [Serie](#serie)
 
+```mdx-code-block
+<APITable name="Pie">
+```
+
+
+|field|default|since|comment|
+|--|--|--|--|
+|radiusGradient|false|v3.8.1|是否开启半径方向的渐变效果。
+
+```mdx-code-block
+</APITable>
+```
+
 ## PolarAxisTheme
 
 > XCharts.Runtime.PolarAxisTheme : [BaseAxisTheme](#baseaxistheme)

Editor/Series/PieEditor.cs

@@ -22,6 +22,7 @@ namespace XCharts.Editor
                 PropertyField("m_Ignore");
                 PropertyField("m_IgnoreValue");
                 PropertyField("m_ClickOffset");
+                PropertyField("m_RadiusGradient");
             });
             PropertyField("m_ItemStyle");
             PropertyField("m_Animation");

Runtime/Serie/Pie/Pie.cs

@@ -1,3 +1,5 @@
+using UnityEngine;
+
 namespace XCharts.Runtime
 {
     [System.Serializable]
@@ -9,9 +11,21 @@ namespace XCharts.Runtime
     [SerieDataExtraField("m_Ignore", "m_Selected", "m_Radius")]
     public class Pie : Serie
     {
+        [SerializeField][Since("v3.8.1")] private bool m_RadiusGradient = false;
+
         public override SerieColorBy defaultColorBy { get { return SerieColorBy.Data; } }
         public override bool titleJustForSerie { get { return true; } }
 
+        /// <summary>
+        /// Whether to use gradient color in pie chart.
+        /// | 是否开启半径方向的渐变效果。
+        /// </summary>
+        public bool radiusGradient
+        {
+            get { return m_RadiusGradient; }
+            set { if (PropertyUtil.SetStruct(ref m_RadiusGradient, value)) { SetVerticesDirty(); } }
+        }
+
         public static Serie AddDefaultSerie(BaseChart chart, string serieName)
         {
             var serie = chart.AddSerie<Pie>(serieName);

Runtime/Serie/Pie/PieHandler.cs

@@ -333,7 +333,7 @@ namespace XCharts.Runtime
             }
         }
 
-        private void DrawPie(VertexHelper vh, Serie serie)
+        private void DrawPie(VertexHelper vh, Pie serie)
         {
             if (!serie.show || serie.animation.HasFadeOut())
             {
@@ -387,7 +387,7 @@ namespace XCharts.Runtime
                 UGL.DrawDoughnut(vh, offsetCenter, insideRadius,
                     outsideRadius, color, toColor, Color.clear, serieData.context.startAngle,
                     drawEndDegree, borderWidth, borderColor, serie.gap / 2, chart.settings.cicleSmoothness,
-                    needRoundCap, true);
+                    needRoundCap, true, serie.radiusGradient);
                 DrawPieCenter(vh, serie, itemStyle, insideRadius);
 
                 if (serie.animation.CheckDetailBreak(serieData.context.toAngle))

Runtime/XUGL/UGL.cs

@@ -1590,7 +1590,7 @@ namespace XUGL
 
         public static void DrawDoughnut(VertexHelper vh, Vector3 center, float insideRadius, float outsideRadius,
             Color32 color, Color32 toColor, Color32 emptyColor, float startDegree, float toDegree, float borderWidth,
-            Color32 borderColor, float gap, float smoothness, bool roundCap = false, bool clockwise = true)
+            Color32 borderColor, float gap, float smoothness, bool roundCap = false, bool clockwise = true, bool radiusGradient = true)
         {
             if (toDegree - startDegree == 0) return;
             if (gap > 0 && Mathf.Abs(toDegree - startDegree) >= 360) gap = 0;
@@ -1785,10 +1785,19 @@ namespace XUGL
                     center.y + insideRadius * Mathf.Cos(currAngle));
                 if (isGradient)
                 {
-                    var tcolor = Color32.Lerp(color, toColor, i * 1.0f / segments);
+                    if (radiusGradient)
-                    if (i == 0 && (needSpace || needBorder))
+                    {
-                        UGL.DrawTriangle(vh, p1, p2, p3, color, tcolor, tcolor);
+                        if (i == 0 && (needSpace || needBorder))
-                    AddVertToVertexHelper(vh, p3, p4, tcolor, tcolor, i > 0);
+                            UGL.DrawTriangle(vh, p1, p2, p3, color, toColor, toColor);
+                        AddVertToVertexHelper(vh, p3, p4, color, toColor, i > 0);
+                    }
+                    else
+                    {
+                        var tcolor = Color32.Lerp(color, toColor, i * 1.0f / segments);
+                        if (i == 0 && (needSpace || needBorder))
+                            UGL.DrawTriangle(vh, p1, p2, p3, color, tcolor, tcolor);
+                        AddVertToVertexHelper(vh, p3, p4, tcolor, tcolor, i > 0);
+                    }
                 }
                 else
                 {