添加测试shader，抽象线路绘制功能

Runtime/UILineRendererUtils.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+namespace XericLibrary
+{
+    /// <summary>
+    /// UILineRenderer 的工具类，提供静态方法用于线条渲染相关的操作
+    /// </summary>
+    public static class UILineRendererUtils
+    {
+        /// <summary>
+        /// 计算线路的总长度
+        /// </summary>
+        /// <param name="points">线路的顶点数组</param>
+        /// <returns>线路的总长度</returns>
+        public static float CalculateTotalLength(Vector2[] points)
+        {
+            if (points.Length < 2)
+                return 0f;
+
+            float totalLength = 0f;
+            for (int i = 0; i < points.Length - 1; i++)
+            {
+                totalLength += Vector2.Distance(points[i], points[i + 1]);
+            }
+            return totalLength;
+        }
+
+        /// <summary>
+        /// 创建线段的顶点数据
+        /// 每个线段由 5 个顶点组成：
+        /// - 起点的左右两个顶点
+        /// - 终点的左右两个顶点
+        /// - 终点的中心点（用于线段连接）
+        /// </summary>
+        /// <param name="point1">线段的起点</param>
+        /// <param name="point2">线段的终点</param>
+        /// <param name="thickness">线条的厚度</param>
+        /// <param name="center">是否居中显示</param>
+        /// <param name="rectSize">矩形变换的尺寸</param>
+        /// <param name="color">线条的颜色</param>
+        /// <param name="vh">用于添加顶点的 VertexHelper 对象</param>
+        /// <param name="currentLength">当前线段起点在线路中的累积长度</param>
+        /// <param name="totalLength">线路的总长度</param>
+        public static void CreateLineSegment(Vector3 point1, Vector3 point2, float thickness, bool center, Vector2 rectSize, Color color, VertexHelper vh, float currentLength, float totalLength)
+        {
+            // 计算偏移量：如果需要居中显示，则偏移到组件中心
+            Vector3 offset = center ? (rectSize / 2) : Vector2.zero;
+
+            // 创建顶点模板，设置颜色为组件的当前颜色
+            UIVertex vertex = UIVertex.simpleVert;
+            vertex.color = color;
+
+            // 计算线段长度
+            float segmentLength = Vector2.Distance(point1, point2);
+            
+            // 计算起点和终点的UV坐标Y值
+            float startUVY = totalLength > 0 ? currentLength / totalLength : 0f;
+            float endUVY = totalLength > 0 ? (currentLength + segmentLength) / totalLength : 0f;
+
+            // 计算起点的旋转角度，使线条垂直于线段方向
+            Quaternion point1Rotation = Quaternion.Euler(0, 0, RotatePointTowards(point1, point2) + 90);
+            
+            // 添加起点的左侧顶点
+            vertex.position = point1Rotation * new Vector3(-thickness / 2, 0);
+            vertex.position += point1 - offset;
+            vertex.uv0 = new Vector2(0f, startUVY); // 左侧顶点的UV
+            vh.AddVert(vertex);
+            
+            // 添加起点的右侧顶点
+            vertex.position = point1Rotation * new Vector3(thickness / 2, 0);
+            vertex.position += point1 - offset;
+            vertex.uv0 = new Vector2(1f, startUVY); // 右侧顶点的UV
+            vh.AddVert(vertex);
+
+            // 计算终点的旋转角度，使线条垂直于线段方向
+            Quaternion point2Rotation = Quaternion.Euler(0, 0, RotatePointTowards(point2, point1) - 90);
+            
+            // 添加终点的左侧顶点
+            vertex.position = point2Rotation * new Vector3(-thickness / 2, 0);
+            vertex.position += point2 - offset;
+            vertex.uv0 = new Vector2(0f, endUVY); // 左侧顶点的UV
+            vh.AddVert(vertex);
+            
+            // 添加终点的右侧顶点
+            vertex.position = point2Rotation * new Vector3(thickness / 2, 0);
+            vertex.position += point2 - offset;
+            vertex.uv0 = new Vector2(1f, endUVY); // 右侧顶点的UV
+            vh.AddVert(vertex);
+
+            // 添加终点的中心点，用于连接后续线段
+            vertex.position = point2 - offset;
+            vertex.uv0 = new Vector2(0.5f, endUVY); // 中心点的UV
+            vh.AddVert(vertex);
+        }
+
+        /// <summary>
+        /// 计算一个点指向另一个点的角度（以度为单位）
+        /// </summary>
+        /// <param name="vertex">起始点</param>
+        /// <param name="target">目标点</param>
+        /// <returns>旋转角度，范围为 -180 到 180 度</returns>
+        public static float RotatePointTowards(Vector2 vertex, Vector2 target)
+        {
+            // 使用反正切函数计算两点之间的角度
+            // 将弧度转换为角度返回
+            return (float)(Mathf.Atan2(target.y - vertex.y, target.x - vertex.x) * (180 / Mathf.PI));
+        }
+    }
+}