增加IconStyle子组件，优化SerieData的图标配置

Runtime/Component/Sub/IconStyle.cs

@@ -0,0 +1,105 @@
+/******************************************/
+/*                                        */
+/*     Copyright (c) 2018 monitor1394     */
+/*     https://github.com/monitor1394     */
+/*                                        */
+/******************************************/
+
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace XCharts
+{
+    /// <summary>
+    /// 系列数据项的图标
+    /// </summary>
+    [System.Serializable]
+    public class IconStyle : SubComponent
+    {
+        public enum Layer
+        {
+            UnderLabel,
+            AboveLabel
+        }
+        [SerializeField] private bool m_Show;
+        [SerializeField] private Layer m_Layer;
+        [SerializeField] private Sprite m_Sprite;
+        [SerializeField] private Color m_Color = Color.white;
+        [SerializeField] private float m_Width = 40;
+        [SerializeField] private float m_Height = 40;
+        [SerializeField] private Vector3 m_Offset;
+
+        /// <summary>
+        /// Whether the data icon is show.
+        /// 是否显示图标。
+        /// </summary>
+        public bool show { get { return m_Show; } set { m_Show = value; UpdateIcon(); } }
+        /// <summary>
+        /// 显示在上层还是在下层。
+        /// </summary>
+        public Layer layer { get { return m_Layer; } set { m_Layer = value; } }
+        /// <summary>
+        /// The image of icon.
+        /// 图标的图片。
+        /// </summary>
+        public Sprite sprite { get { return m_Sprite; } set { m_Sprite = value; } }
+        /// <summary>
+        /// 图标颜色。
+        /// </summary>
+        public Color color { get { return m_Color; } set { m_Color = value; } }
+        /// <summary>
+        /// 图标宽。
+        /// </summary>
+        public float width { get { return m_Width; } set { m_Width = value; } }
+        /// <summary>
+        /// 图标高。
+        /// </summary>
+        public float height { get { return m_Height; } set { m_Height = value; } }
+        /// <summary>
+        /// 图标偏移。
+        /// </summary>
+        public Vector3 offset { get { return m_Offset; } set { m_Offset = value; } }
+
+        public Image image { get; private set; }
+        public RectTransform rect { get; private set; }
+
+        public void SetImage(Image image)
+        {
+            this.image = image;
+            if (image)
+            {
+                rect = image.GetComponent<RectTransform>();
+                if (m_Layer == Layer.UnderLabel)
+                    rect.SetSiblingIndex(0);
+                else
+                    rect.SetSiblingIndex(image.transform.childCount - 1);
+                UpdateIcon();
+            }
+        }
+
+        public void SetActive(bool flag)
+        {
+            if (image)
+            {
+                ChartHelper.SetActive(image.gameObject, flag);
+            }
+        }
+
+        public void UpdateIcon()
+        {
+            if (image == null) return;
+            if (show)
+            {
+                ChartHelper.SetActive(image.gameObject, true);
+                image.sprite = m_Sprite;
+                image.color = m_Color;
+                rect.sizeDelta = new Vector2(m_Width, m_Height);
+                image.transform.localPosition = m_Offset;
+            }
+            else
+            {
+                ChartHelper.SetActive(image.gameObject, false);
+            }
+        }
+    }
+}