[fix][pie] fix pie draw error when set border (#225)

CHANGELOG.md

@@ -59,6 +59,7 @@
 
 ## master
 
+* (2022.10.13) 修复`Pie`的环形饼图设置边框时效果异常的问题 (#225)
 * (2022.10.13) 修复`Download`的接口造成`iOS`平台打包失败的问题
 * (2022.10.12) 增加`Animation`的`UnscaledTime`支持设置动画是否受TimeScale的影响 (#223)
 * (2022.10.10) 调整文档格式

Runtime/XUGL/UGL.cs

@@ -1695,10 +1695,14 @@ namespace XUGL
                 if (isGradient)
                 {
                     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
                 {
+                    if (i == 0 && (needSpace || needBorder))
+                        UGL.DrawTriangle(vh, p1, p2, p3, color);
                     AddVertToVertexHelper(vh, p3, p4, color, color, i > 0);
                 }
                 p1 = p4;