85 lines
2.9 KiB
C#
85 lines
2.9 KiB
C#
using UnityEngine;
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namespace EventBossFight
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{
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/// <summary>
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/// UI RectTransform 跟随另一 RectTransform（视频 Boss 挂点，替代 Spine BoneFollower）。
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/// 同一 rootCanvas 下直接同步世界坐标；否则经屏幕坐标转换到父 Rect 的局部空间。
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/// </summary>
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[RequireComponent(typeof(RectTransform))]
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[DefaultExecutionOrder(1000)]
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public class EventBossFightRectFollowerGraphic : MonoBehaviour
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{
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[SerializeField]
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private RectTransform target;
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public RectTransform Target => target;
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public void SetTarget(RectTransform t)
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{
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target = t;
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}
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private void OnEnable()
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{
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ApplyFollow();
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}
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private void LateUpdate()
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{
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ApplyFollow();
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}
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private void ApplyFollow()
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{
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if (!target)
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return;
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var self = (RectTransform)transform;
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var parent = self.parent as RectTransform;
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if (!parent)
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{
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self.SetPositionAndRotation(target.position, target.rotation);
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return;
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}
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var canvasSelf = self.GetComponentInParent<Canvas>();
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var canvasTarget = target.GetComponentInParent<Canvas>();
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if (canvasSelf && canvasTarget && canvasSelf.rootCanvas == canvasTarget.rootCanvas)
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{
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self.SetPositionAndRotation(target.position, target.rotation);
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return;
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}
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var camTarget = GetEventCamera(canvasTarget);
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var camSelf = GetEventCamera(canvasSelf);
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// Overlay 下 WorldToScreenPoint 须传 null；Camera 模式用对应 Canvas 的 worldCamera
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Camera camForScreen = null;
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if (canvasTarget != null && canvasTarget.renderMode == RenderMode.ScreenSpaceOverlay)
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camForScreen = null;
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else
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camForScreen = camTarget ?? camSelf ?? Camera.main;
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var screenPoint = RectTransformUtility.WorldToScreenPoint(camForScreen, target.position);
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var camForParent = canvasSelf && canvasSelf.renderMode == RenderMode.ScreenSpaceOverlay
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? null
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: camSelf ?? camForScreen;
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if (RectTransformUtility.ScreenPointToLocalPointInRectangle(parent, screenPoint, camForParent,
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out var localPoint))
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{
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self.anchoredPosition = localPoint;
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self.localRotation = Quaternion.Inverse(parent.rotation) * target.rotation;
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}
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else
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self.SetPositionAndRotation(target.position, target.rotation);
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}
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private static Camera GetEventCamera(Canvas canvas)
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{
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if (!canvas || canvas.renderMode == RenderMode.ScreenSpaceOverlay)
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return null;
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return canvas.worldCamera;
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}
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}
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}
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