113 lines
4.4 KiB
C#
113 lines
4.4 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.UI;
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public class TargetIndicator : MonoBehaviour
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{
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public Camera mainCamera; // 玩家摄像机
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public Transform target; // 目标点
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public RectTransform uiCanvas; // UI Canvas 的 RectTransform
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public RectTransform targetIcon; // 目标图标的 UI
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public Text distanceText; // 屏幕内显示的距离文本
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public RectTransform arrowIcon; // 屏幕外箭头图标
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public Text arrowDistanceText; // 屏幕外箭头后面的距离文本
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public float edgePadding = 50f; // 箭头距离屏幕边缘的间距
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public Vector2 textOffset = new Vector2(0, -30); // 文本相对箭头的偏移
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void Update()
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{
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// 将目标点从世界坐标转换到屏幕坐标
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Vector3 screenPoint = mainCamera.WorldToScreenPoint(target.position);
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// 检查目标是否在屏幕内
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if (screenPoint.z > 0 && screenPoint.x > 0 && screenPoint.x < Screen.width && screenPoint.y > 0 && screenPoint.y < Screen.height)
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{
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// 目标在屏幕内，显示目标图标
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targetIcon.gameObject.SetActive(true);
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arrowIcon.gameObject.SetActive(false); // 隐藏箭头
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arrowDistanceText.gameObject.SetActive(false); // 隐藏箭头距离文本
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// 更新图标位置
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targetIcon.position = screenPoint;
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// 更新屏幕内距离文本
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float distance = Vector3.Distance(mainCamera.transform.position, target.position);
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distanceText.text = $"{distance:F1}m";
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}
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else
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{
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// 目标在屏幕外，显示箭头
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targetIcon.gameObject.SetActive(false);
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arrowIcon.gameObject.SetActive(true); // 显示箭头
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arrowDistanceText.gameObject.SetActive(true); // 显示箭头距离文本
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// 如果目标在玩家后方，翻转方向
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if (screenPoint.z < 0)
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{
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screenPoint.x = Screen.width - screenPoint.x; // 水平翻转
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screenPoint.y = Screen.height - screenPoint.y; // 垂直翻转
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}
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// 计算目标点相对于屏幕中心的方向
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Vector3 direction = (screenPoint - new Vector3(Screen.width / 2, Screen.height / 2, 0)).normalized;
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// 计算箭头在屏幕边界的位置
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Vector3 edgePosition = GetScreenEdgePosition(direction);
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// 设置箭头位置
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arrowIcon.position = edgePosition;
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// 设置距离文本位置（在箭头下方或后面）
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Vector3 textPosition = edgePosition + (Vector3)textOffset;
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textPosition = ClampToScreenBounds(textPosition); // 限制文本在屏幕范围内
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arrowDistanceText.transform.position = textPosition;
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// 保持距离文本水平显示
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arrowDistanceText.transform.rotation = Quaternion.identity;
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// 更新距离文本内容
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float distance = Vector3.Distance(mainCamera.transform.position, target.position);
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arrowDistanceText.text = $"{distance:F1}m";
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// 旋转箭头使其指向目标方向
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float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
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arrowIcon.rotation = Quaternion.Euler(0, 0, angle);
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}
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}
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// 计算箭头在屏幕边界的位置
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private Vector3 GetScreenEdgePosition(Vector3 direction)
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{
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// 计算屏幕宽高
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float halfScreenWidth = Screen.width / 2 - edgePadding;
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float halfScreenHeight = Screen.height / 2 - edgePadding;
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// 判断箭头是否应该在屏幕的上下边缘
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float slope = direction.y / direction.x;
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if (Mathf.Abs(slope) > halfScreenHeight / halfScreenWidth)
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{
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// 在上下边缘
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float edgeY = Mathf.Sign(direction.y) * halfScreenHeight + Screen.height / 2;
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float edgeX = (edgeY - Screen.height / 2) / slope + Screen.width / 2;
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return new Vector3(edgeX, edgeY, 0);
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}
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else
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{
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// 在左右边缘
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float edgeX = Mathf.Sign(direction.x) * halfScreenWidth + Screen.width / 2;
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float edgeY = slope * (edgeX - Screen.width / 2) + Screen.height / 2;
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return new Vector3(edgeX, edgeY, 0);
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}
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}
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// 限制文本在屏幕范围内
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private Vector3 ClampToScreenBounds(Vector3 position)
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{
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position.x = Mathf.Clamp(position.x, edgePadding, Screen.width - edgePadding);
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position.y = Mathf.Clamp(position.y, edgePadding, Screen.height - edgePadding);
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return position;
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}
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}
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