71 lines
2.0 KiB
C#
71 lines
2.0 KiB
C#
using UnityEngine;
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using UnityEngine.EventSystems;
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public class UIDragToScene3D : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
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{
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public GameObject buildingPrefab; // 对应的建筑预制件
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private GameObject previewObject; // 拖动时显示的建筑物（实际的 3D 模型）
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/// <summary>
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/// 开始拖动时
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/// </summary>
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/// <param name="eventData"></param>
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public void OnBeginDrag(PointerEventData eventData)
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{
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Debug.Log("Drag Started");
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// 创建一个 3D 物体作为拖动中的预览对象
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if (buildingPrefab != null)
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{
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previewObject = Instantiate(buildingPrefab);
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previewObject.GetComponent<Collider>().enabled = false; // 禁用碰撞体，避免干扰物理检测
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}
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}
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// 拖动中
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public void OnDrag(PointerEventData eventData)
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{
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if (previewObject != null)
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{
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// 获取鼠标的世界坐标
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Vector3 mouseWorldPosition = GetMouseWorldPosition();
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previewObject.transform.position = mouseWorldPosition; // 更新预览对象的位置
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}
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}
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/// <summary>
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/// 拖动结束时
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/// </summary>
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/// <param name="eventData"></param>
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public void OnEndDrag(PointerEventData eventData)
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{
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Debug.Log("Drag Ended");
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if (previewObject != null)
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{
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// 在拖动结束时将预览对象转为实际的建筑物
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previewObject.GetComponent<Collider>().enabled = true; // 恢复碰撞体
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previewObject = null; // 清空预览对象
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}
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}
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/// <summary>
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/// 获取鼠标的世界坐标
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/// </summary>
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/// <returns></returns>
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private Vector3 GetMouseWorldPosition()
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{
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Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
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if (Physics.Raycast(ray, out RaycastHit hit, Mathf.Infinity))
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{
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// 如果射线命中地面，返回命中的点
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return hit.point;
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}
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else
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{
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// 如果没有命中地面，返回一个默认点
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return ray.GetPoint(10); // 默认距离相机 10 个单位
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}
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}
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}
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