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Assets/Scripts/SpaceConverter.cs

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+using UnityEngine;
+
+namespace Ichni
+{
+    public static class SpaceConverter
+    {
+        /// <summary>
+        /// 世界坐标转换为屏幕坐标
+        /// </summary>
+        /// <param name="worldPoint">屏幕坐标</param>
+        /// <returns></returns>
+        public static Vector2 WorldPointToScreenPoint(Vector3 worldPoint)
+        {
+            // Camera.main 世界摄像机
+            Vector2 screenPoint = GameManager.instance.cameraManager.gameCamera.gameCamera.WorldToScreenPoint(worldPoint);
+            return screenPoint;
+        }
+
+        /// <summary>
+        /// 屏幕坐标转换为世界坐标
+        /// </summary>
+        /// <param name="screenPoint">屏幕坐标</param>
+        /// <param name="planeZ">距离摄像机 Z 平面的距离</param>
+        /// <returns></returns>
+        public static Vector3 ScreenPointToWorldPoint(Vector2 screenPoint, float planeZ)
+        {
+            // Camera.main 世界摄像机
+            Vector3 position = new Vector3(screenPoint.x, screenPoint.y, planeZ);
+            Vector3 worldPoint = GameManager.instance.cameraManager.gameCamera.gameCamera.ScreenToWorldPoint(position);
+            return worldPoint;
+        }
+
+
+        public static Vector2 WorldPointToUILocalPoint(RectTransform rt, Vector3 worldPosition)
+        {
+            // 将世界坐标转换为屏幕坐标
+            var screenPosition = WorldPointToScreenPoint(worldPosition);
+            // 将屏幕坐标转换为 UGUI 坐标
+            Vector2 localPoint = ScreenPointToUILocalPoint(rt, screenPosition);
+
+            return localPoint;
+        }
+
+        public static Vector3 WorldPointToUIPoint(RectTransform rt, Vector3 worldPosition)
+        {
+            // 将世界坐标转换为屏幕坐标
+            var screenPosition = WorldPointToScreenPoint(worldPosition);
+            // 将屏幕坐标转换为 UGUI 坐标
+            Vector3 uiPoint = ScreenPointToUIPoint(rt, screenPosition);
+
+            return uiPoint;
+        }
+
+        // RectTransformUtility.WorldToScreenPoint
+        // RectTransformUtility.ScreenPointToWorldPointInRectangle
+        // RectTransformUtility.ScreenPointToLocalPointInRectangle
+        // 上面三个坐标转换的方法使用 Camera 的地方
+        // 当 Canvas renderMode 为 RenderMode.ScreenSpaceCamera、RenderMode.WorldSpace 时 传递参数 canvas.worldCamera
+        // 当 Canvas renderMode 为 RenderMode.ScreenSpaceOverlay 时 传递参数 null
+
+        // UI 坐标转换为屏幕坐标
+        public static Vector2 UIPointToScreenPoint(Vector3 worldPoint)
+        {
+            Vector2 screenPoint = RectTransformUtility.WorldToScreenPoint(GameManager.instance.cameraManager.uiCamera, worldPoint);
+            return screenPoint;
+        }
+
+        // 屏幕坐标转换为 UGUI 坐标
+        public static Vector3 ScreenPointToUIPoint(RectTransform rt, Vector2 screenPoint)
+        {
+            //UI屏幕坐标转换为世界坐标
+            // 当 Canvas renderMode 为 RenderMode.ScreenSpaceCamera、RenderMode.WorldSpace 时 uiCamera 不能为空
+            // 当 Canvas renderMode 为 RenderMode.ScreenSpaceOverlay 时 uiCamera 可以为空
+            RectTransformUtility.ScreenPointToWorldPointInRectangle(rt, screenPoint, GameManager.instance.cameraManager.uiCamera, out Vector3 globalMousePos);
+            // 转换后的 globalMousePos 使用下面方法赋值
+            // target 为需要使用的 UI RectTransform
+            // rt 可以是 target.GetComponent<RectTransform>(), 也可以是 target.parent.GetComponent<RectTransform>()
+            // target.transform.position = globalMousePos;
+            return globalMousePos;
+        }
+
+        // 屏幕坐标转换为 UGUI RectTransform 的 anchoredPosition
+        public static Vector2 ScreenPointToUILocalPoint(RectTransform parentRT, Vector2 screenPoint)
+        {
+            RectTransformUtility.ScreenPointToLocalPointInRectangle(parentRT, screenPoint, GameManager.instance.cameraManager.uiCamera, out Vector2 localPos);
+            // 转换后的 localPos 使用下面方法赋值
+            // target 为需要使用的 UI RectTransform
+            // parentRT 是 target.parent.GetComponent<RectTransform>()
+            // 最后赋值 target.anchoredPosition = localPos;
+            return localPos;
+        }
+    }
+}