优化RadarChart雷达图，增加多雷达图支持

Scripts/UI/Internal/AreaStyle.cs

@@ -0,0 +1,83 @@
+
+using UnityEngine;
+
+namespace XCharts
+{
+    /// <summary>
+    /// The style of area.
+    /// 区域填充样式。
+    /// </summary>
+    [System.Serializable]
+    public class AreaStyle
+    {
+        /// <summary>
+        /// Origin position of area.
+        /// 图形区域的起始位置。默认情况下，图形会从坐标轴轴线到数据间进行填充。如果需要填充的区域是坐标轴最大值到数据间，或者坐标轴最小值到数据间，则可以通过这个配置项进行设置。
+        /// </summary>
+        public enum AreaOrigin
+        {
+            /// <summary>
+            /// to fill between axis line to data.
+            /// 填充坐标轴轴线到数据间的区域。
+            /// </summary>
+            Auto,
+            /// <summary>
+            /// to fill between min axis value (when not inverse) to data.
+            /// 填充坐标轴底部到数据间的区域。
+            /// </summary>
+            Start,
+            /// <summary>
+            /// to fill between max axis value (when not inverse) to data.
+            /// 填充坐标轴顶部到数据间的区域。
+            /// </summary>
+            End
+        }
+        [SerializeField] private bool m_Show;
+        [SerializeField] private AreaOrigin m_Origin;
+        [SerializeField] private Color m_Color;
+        [SerializeField] private Color m_ToColor;
+        [SerializeField][Range(0,1)] private float m_Opacity;
+
+        /// <summary>
+        /// Set this to false to prevent the areafrom showing.
+        /// 是否显示区域填充。
+        /// </summary>
+        public bool show { get { return m_Show; } set { m_Show = value; } }
+        /// <summary>
+        /// 
+        /// 图形区域的起始位置。
+        /// </summary>
+        public AreaOrigin origin { get { return m_Origin; } set { m_Origin = value; } }
+        /// <summary>
+        /// the color of area,default use serie color.
+        /// 区域填充的颜色，如果toColor不是默认值，则表示渐变色的起点颜色。
+        /// </summary>
+        public Color color { get { return m_Color; } set { m_Color = value; } }
+        /// <summary>
+        /// Gradient color, start color to toColor.
+        /// 渐变色的终点颜色。
+        /// </summary>
+        /// <value></value>
+        public Color toColor { get { return m_ToColor; } set { m_ToColor = value; } }
+        /// <summary>
+        /// Opacity of the component. Supports value from 0 to 1, and the component will not be drawn when set to 0.
+        /// 图形透明度。支持从 0 到 1 的数字，为 0 时不绘制该图形。
+        /// </summary>
+        public float opactiy { get { return m_Opacity; } set { m_Opacity = value; } }
+
+        public static AreaStyle defaultAreaStyle
+        {
+            get
+            {
+                var area = new AreaStyle
+                {
+                    m_Show = false,
+                    m_Color = Color.clear,
+                    m_ToColor = Color.clear,
+                    m_Opacity = 1
+                };
+                return area;
+            }
+        }
+    }
+}