整理代码结构，支持Package Manager添加

Scripts/Runtime/Component/Sub/ItemStyle.cs

@@ -0,0 +1,69 @@
+/******************************************/
+/*                                        */
+/*     Copyright (c) 2018 monitor1394     */
+/*     https://github.com/monitor1394     */
+/*                                        */
+/******************************************/
+
+
+using UnityEngine;
+
+namespace XCharts
+{
+    /// <summary>
+    /// 图形样式。
+    /// </summary>
+    [System.Serializable]
+    public class ItemStyle : SubComponent
+    {
+        /// <summary>
+        /// 线的类型。
+        /// </summary>
+        public enum Type
+        {
+            /// <summary>
+            /// 实线
+            /// </summary>
+            Solid,
+            /// <summary>
+            /// 虚线
+            /// </summary>
+            Dashed,
+            /// <summary>
+            /// 点线
+            /// </summary>
+            Dotted
+        }
+        [SerializeField] private bool m_Show = false;
+        [SerializeField] private Color m_Color;
+        [SerializeField] private Type m_BorderType = Type.Solid;
+        [SerializeField] private float m_BorderWidth = 0;
+        [SerializeField] private Color m_BorderColor;
+        [SerializeField] [Range(0, 1)] private float m_Opacity = 1;
+
+        /// <summary>
+        /// 是否启用。
+        /// </summary>
+        public bool show { get { return m_Show; } set { m_Show = value; } }
+        /// <summary>
+        /// 数据项颜色。
+        /// </summary>
+        public Color color { get { return m_Color; } set { m_Color = value; } }
+        /// <summary>
+        /// 边框的类型。
+        /// </summary>
+        public Type borderType { get { return m_BorderType; } set { m_BorderType = value; } }
+        /// <summary>
+        /// 边框的颜色。
+        /// </summary>
+        public Color borderColor { get { return m_BorderColor; } set { m_BorderColor = value; } }
+        /// <summary>
+        /// 边框宽。
+        /// </summary>
+        public float borderWidth { get { return m_BorderWidth; } set { m_BorderWidth = value; } }
+        /// <summary>
+        /// 透明度。支持从 0 到 1 的数字，为 0 时不绘制该图形。
+        /// </summary>
+        public float opacity { get { return m_Opacity; } set { m_Opacity = value; } }
+    }
+}