177 lines
6.2 KiB
C#
177 lines
6.2 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using Mirror;
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using UnityEngine;
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public class CleanBullet : NetworkBehaviour
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{
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[Header("Flight")]
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[Tooltip("水平前方飞行的目标距离（单位：米）")]
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public float flightDistance = 30f;
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[Tooltip("从发射到落地的飞行时间（单位：秒）。根据需要调整以改变弧度高低")]
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public float flightTime = 2.0f;
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[Tooltip("是否在发射时立即启用物理重力（Rigidbody.useGravity）")]
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public bool enableGravity = true;
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[Tooltip("爆炸特效存在多长时间（秒），之后会被销毁；0 表示不自动销毁")]
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public float explosionDuration = 3f;
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[Tooltip("碰撞判断的层掩码（比如 Ground） - 若为 0 则对任何碰撞都触发爆炸")]
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public LayerMask groundLayer = 0;
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[Tooltip("碰撞触发时是否只在第一次触发后执行爆炸（避免多次触发）")]
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public bool onlyExplodeOnce = true;
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[Header("Options")]
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[Tooltip("是否在 Start 中自动发射（否则外部调用 Launch()）")]
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public bool autoLaunch = true;
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[Tooltip("发射时额外的高度偏移（local space），用于把炮弹向上或向下偏移起始点")]
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public Vector3 launchLocalOffset = Vector3.zero;
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// 内部
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Rigidbody rb;
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bool launched = false;
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float launchTime = 0f;
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bool exploded = false;
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void Awake()
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{
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rb = GetComponent<Rigidbody>();
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}
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void Start()
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{
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if (autoLaunch)
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{
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}
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}
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/// <summary>
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/// 外部调用：发射炮弹（使用当前 transform.forward 方向）
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/// </summary>
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public void Launch()
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{
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if (launched) return;
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launched = true;
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launchTime = Time.time;
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// 确保 Rigidbody 存在
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if (rb == null) rb = GetComponent<Rigidbody>();
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// 打开/关闭重力（通常使用真实重力）
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rb.useGravity = enableGravity;
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// 计算初速度：选定飞行时间 T，使水平距离为 flightDistance。
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// 令水平速度 vx = forward * (flightDistance / T)
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// 垂直速度 vy = -0.5 * g * T （使得在时间 T 回到同一高度）
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// 公式来源： y(T) = vy * T + 0.5 * g * T^2 = 0 -> vy = -0.5 * g * T
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Vector3 worldForward = transform.forward;
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Vector3 startPos = transform.position + transform.TransformVector(launchLocalOffset);
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// 使用 Physics.gravity 而不是固定值，保持一致
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Vector3 g = Physics.gravity; // 通常是 (0, -9.81, 0)
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// 水平分量（X-Z 面）
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Vector3 forwardHorizontal = new Vector3(worldForward.x, 0f, worldForward.z);
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float forwardHorizMag = forwardHorizontal.magnitude;
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if (forwardHorizMag < 1e-6f)
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{
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// 如果 forward 几乎垂直，则用 transform.up 和 transform.right 组合，避免除零
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forwardHorizontal = transform.right;
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forwardHorizMag = forwardHorizontal.magnitude;
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}
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forwardHorizontal.Normalize();
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float T = Mathf.Max(0.01f, flightTime); // 防止除零
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// 计算水平速度大小
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float horizontalSpeed = flightDistance / T;
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// 计算垂直速度
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float vy = -0.5f * g.y * T; // g.y 是负值，注意符号
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Vector3 initialVelocity = forwardHorizontal * horizontalSpeed + Vector3.up * vy;
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// 设置 Rigidbody 的速度
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rb.velocity = initialVelocity;
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// 如果需要，也可以使用 AddForce 而不是直接设置速度：
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// rb.AddForce(initialVelocity - rb.velocity, ForceMode.VelocityChange);
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// 启动一个超时监测，防止永远不触发碰撞
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StartCoroutine(FlightTimeoutRoutine(T + 0.5f));
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}
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IEnumerator FlightTimeoutRoutine(float wait)
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{
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yield return new WaitForSeconds(wait);
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if (!exploded)
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{
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Explode(transform.position, Vector3.up);
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}
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}
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void OnCollisionEnter(Collision collision)
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{
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if (exploded && onlyExplodeOnce) return;
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// 如果 groundLayer 为 0，表示对任何碰撞都触发爆炸
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if (groundLayer == 0 || ((groundLayer.value & (1 << collision.gameObject.layer)) != 0))
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{
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// 在碰撞点爆炸（取第一个接触点）
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ContactPoint contact = collision.contacts[0];
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Explode(contact.point, contact.normal);
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}
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}
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/// <summary>
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/// 播放爆炸特效并销毁炮弹
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/// </summary>
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/// <param name="pos">世界位置</param>
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/// <param name="normal">法线，用于对齐特效朝向</param>
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void Explode(Vector3 pos, Vector3 normal)
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{
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if (exploded && onlyExplodeOnce) return;
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exploded = true;
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GameManager.Ins.CreateExplosion(pos,EnemyType.Clean);
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// 这里可以扩展伤害/力场效果，例如 Physics.OverlapSphere + 对敌人造成伤害
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// 销毁炮弹对象（延迟一帧以保证碰撞回调完成）
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Destroy(gameObject);
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}
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#if UNITY_EDITOR
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// 编辑器辅助：在场景视图显示预测弧线（基于当前参数）
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void OnDrawGizmosSelected()
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{
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if (!Application.isPlaying)
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{
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// 画出从 0 到 flightTime 的轨迹采样
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int steps = 30;
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Vector3 start = transform.position;
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Vector3 worldForward = transform.forward;
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Vector3 forwardHorizontal = new Vector3(worldForward.x, 0f, worldForward.z);
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if (forwardHorizontal.sqrMagnitude < 1e-6f)
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forwardHorizontal = transform.right;
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forwardHorizontal.Normalize();
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float T = Mathf.Max(0.01f, flightTime);
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Vector3 g = Physics.gravity;
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float horizontalSpeed = flightDistance / T;
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float vy = -0.5f * g.y * T;
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Vector3 v0 = forwardHorizontal * horizontalSpeed + Vector3.up * vy;
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Vector3 prev = start;
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for (int i = 1; i <= steps; i++)
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{
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float t = (T * i) / steps;
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Vector3 pos = start + v0 * t + 0.5f * g * t * t;
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Gizmos.color = Color.cyan;
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Gizmos.DrawLine(prev, pos);
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prev = pos;
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}
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}
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}
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#endif
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}
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