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using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Serialization;
namespace DamageVolumeSystem
{
[Icon("Assets/Scripts/DamageVolumeSystem/Icon/DamageGenerator.png")]
[RequireComponent(typeof(BoxCollider))]
[ExecuteAlways]
public class DamageGenerator : MonoBehaviour
{
[HideInInspector] public DamageHost binding;
// 伤害
public int damage = 2500;
// 衰减曲线
public AnimationCurve falloffCurveByDistance = AnimationCurve.Linear(0, 1, 1, 0);
public AnimationCurve falloffCurveBySpeed = AnimationCurve.Linear(0, 1, 1, 0);
// 碰撞体
private BoxCollider _collider;
// 碰撞时发生伤害
public bool emitOnCollide = true;
// 扫描到的碰撞体
private readonly HashSet<DamageHost> _scannedHosts = new();
// 速度缩放
private float _speedScale;
// 上一帧的位置
private Vector3 _lastPosition;
private void Start()
{
_collider = GetComponent<BoxCollider>();
}
private void FixedUpdate()
{
var p = transform.position;
var distanceToLast = Vector3.Distance(p, _lastPosition);
var next = falloffCurveBySpeed.Evaluate(1 - Mathf.Clamp01(distanceToLast / 1.5f));
_speedScale = 0.5f + next * 2;
_lastPosition = p;
}
public void Update()
{
#if UNITY_EDITOR
_collider.isTrigger = true;
_collider.center = Vector3.zero;
_collider.size = transform.lossyScale;
#endif
}
private void OnTriggerEnter(Collider other)
{
var damageHost = other.GetComponent<DamageHost>();
if (damageHost != null && _scannedHosts.Add(damageHost))
{
// 碰撞时立刻产生伤害
if (emitOnCollide)
Emit();
}
}
private void OnTriggerExit(Collider other)
{
var damageHost = other.GetComponent<DamageHost>();
if (damageHost != null && _scannedHosts.Contains(damageHost))
{
_scannedHosts.Remove(damageHost);
}
}
public void Emit()
{
var pos = transform.position;
foreach (var scannedHost in _scannedHosts)
{
var selfGroup = binding?.group ?? 12;
if (selfGroup == scannedHost.group)
continue;
var posTarget = scannedHost.transform.position;
var distance = Vector3.Distance(pos, posTarget);
var percent = Mathf.Clamp01(distance / 2);
var direction = (posTarget - pos).normalized;
// 用衰减曲线重新映射百分比
var rePercent = falloffCurveByDistance.Evaluate(1 - percent);
var calcDamage = Mathf.RoundToInt(rePercent * damage * _speedScale);
Debug.Log($"[伤害生成器: {gameObject.name}] 对 {scannedHost.name} 造成 {calcDamage} 点伤害 (距离衰减 {percent} -> {rePercent}, 速度增益 {_speedScale})");
scannedHost.onDamageReceived.Invoke(new Damage
{
Group = binding?.group ?? 12,
Force = calcDamage,
Direction = direction,
});
}
}
# region Display
private void OnDrawGizmos()
{
var t = transform;
Gizmos.color = GetColorByGroupId(binding?.group?? 12);
// 画指向线
foreach (var scannedHost in _scannedHosts)
{
Gizmos.DrawLine(scannedHost.transform.position, t.position);
}
// 画生成框
Gizmos.matrix = t.localToWorldMatrix;
DrawSpecialCube(Vector3.zero, t.lossyScale);
}
private void DrawSpecialCube(Vector3 center, Vector3 size)
{
var color = Gizmos.color;
Gizmos.DrawWireCube(center, size);
Gizmos.color = new Color(color.r, color.g, color.b, 0.5f);
Gizmos.DrawCube(center, size);
}
private Color GetColorByGroupId(int group)
{
switch (group)
{
case 0: return Color.red;
case 1: return Color.blue;
case 2: return Color.green;
case 3: return Color.yellow;
case 4: return Color.magenta;
case 5: return Color.cyan;
case 6: return new Color(1f, 0.5f, 0f);
case 7: return new Color(0.4f, 0.01f, 0.5f);
case 8: return new Color(0.63f, 0.87f, 0f);
case 9: return new Color(0.98f, 0.67f, 0.91f);
case 10: return new Color(0.49f, 0.93f, 0.67f);
case 11: return new Color(0.11f, 0.55f, 0.8f);
default: return Color.white;
}
}
#endregion
}
}
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