Unity3D血条(HP)
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1 需求实现
人机交互Input 中实现了通过键盘控制坦克运动,通过鼠标控制坦克发射炮弹,本文将在此基础上,增加血条(HP)功能。炮弹命中后,HP 值会减少,因此需要应用到 刚体组件Rigidbody 和 碰撞体组件Collider;从不同角度攻击敌人时,敌人的血条始终朝向相机,因此需要用到 相机跟随;血条通过 Image 显示,因此需要用到 UGUI之Image;玩家的血条始终显示在屏幕左上角,因此需要使用到 锚点。
1)需求实现
- 前后箭头键或 W, S 键控制玩家前进或后退;
- 左右箭头键或 A, D 键控制玩家左右转向;
- 鼠标左键或空格键控制玩家发射炮弹;
- 玩家血条显示在屏幕左上角;
- 相机在玩家后上方的位置,始终跟随玩家,朝玩家正前方看;
- 玩家移动时,敌人转向玩家,当偏离玩家的角度小于5°时,发射炮弹;
- 敌人血条显示在其上方,并且始终看向相机。
2)涉及技术栈
本文代码资源见 → Unity3D 血条效果。
2 游戏对象
1)游戏界面
2)游戏对象层级结构
3)Transform组件参数
\\1. 玩家 Transform 组件参数
Name | Type | Position | Rotation | Scale | Color/Texture |
---|---|---|---|---|---|
Player | Empty | (0, 0.25, -5) | (0, 0, 0) | (1, 1, 1) | #228439FF |
Botton | Cube | (0, 0, 0) | (0, 0, 0) | (2, 0.5, 2) | #228439FF |
Top | Cube | (0, 0.5, 0) | (0, 0, 0) | (1, 0.5, 1) | #228439FF |
Gun | Cylinder | (0, 0, 1.5) | (90, 0, 0) | (0.2, 1, 0.4) | #228439FF |
FirePoint | Empty | (0, 1.15, 0) | (0, 0, 0) | (1, 1, 1) | —— |
补充:Player 游戏对象添加了刚体组件,并修改 Mass = 100,Drag = 1,AngularDrag = 0.1,Freeze Rotation 中勾选 X 和 Z。
\\2. 玩家 HP RectTransform 组件参数
Name | Type | Rect | Width/Height | Pos | Color/Texture |
---|---|---|---|---|---|
PlayerHP | Canvas | —— | —— | —— | —— |
Panel | Panel | (0, 0, 0, 0) | —— | (-, -, 0) | #FFFFFF00 |
HealthBG | Image | (0, 0.25, -5) | (200, 20) | (125, -30, 0) | #FFFFFFFF |
Health | Image | (0, 0.25, -5) | (200, 20) | (125, -30, 0) | #FF2230FF |
补充: 玩家 PlayerHP 的 Canvas 渲染模式是 Screen Space - Overlay,Health 的 ImageType 设置为 Filled,Fill Method 设置为 Horizontal。
\\3. 敌人 Transform 组件参数
Name | Type | Position | Rotation | Scale | Color/Texture |
---|---|---|---|---|---|
Enemy | Empty | (0, 0.25, 5) | (0, 180, 0) | (1, 1, 1) | #15D3F9FF |
Botton | Cube | (0, 0, 0) | (0, 0, 0) | (2, 0.5, 2) | #15D3F9FF |
Top | Cube | (0, 0.5, 0) | (0, 0, 0) | (1, 0.5, 1) | #15D3F9FF |
Gun | Cylinder | (0, 0, 1.5) | (90, 0, 0) | (0.2, 1, 0.4) | #15D3F9FF |
FirePoint | Empty | (0, 1.15, 0) | (0, 0, 0) | (1, 1, 1) | —— |
补充:Enemy 游戏对象添加了刚体组件,并修改 Mass = 100,Drag = 0.5,AngularDrag = 0.1,Freeze Rotation 中勾选 X 和 Z。
\\4. 敌人 HP RectTransform 组件参数
Name | Type | Width/Height | Pos | Color/Texture |
---|---|---|---|---|
HP | Canvas | (2, 0.2) | (0, 0.85, 0) | —— |
HealthBG | Image | (2, 0.2) | (0, 0, 0) | #FFFFFFFF |
Health | Image | (2, 0.2) | (0, 0, 0) | #FF2230FF |
补充: 敌人 HP 的 Canvas 渲染模式是 World Space,Health 的 ImageType 设置为 Filled,Fill Method 设置为 Horizontal。
\\5. 地面和炮弹 Transform 组件参数
Name | Type | Position | Rotation | Scale | Color/Texture |
---|---|---|---|---|---|
Plane | Plane | (0, 0, 0) | (0, 0, 0) | (10, 10, 10) | GrassRockyAlbedo |
Bullet | Sphere | (0, 0.5, -5) | (0, 0, 0) | (0.3, 0.3, 0.3) | #228439FF |
补充:炮弹作为预设体拖拽到 Assets/Resources/Prefabs 目录下,并且添加了刚体组件。
3 脚本组件
1)CameraController
CameraController.cs
using UnityEngine;
public class CameraController : MonoBehaviour
private Transform player; // 玩家
private Vector3 relaPlayerPos; // 相机在玩家坐标系中的位置
private float targetDistance = 15f; // 相机看向玩家前方的位置
private void Start()
relaPlayerPos = new Vector3(0, 4, -8);
player = GameObject.Find("Player/Top").transform;
private void LateUpdate()
CompCameraPos();
private void CompCameraPos() // 计算相机坐标
Vector3 target = player.position + player.forward * targetDistance;
transform.position = transformVecter(relaPlayerPos, player.position, player.right, player.up, player.forward);
transform.rotation = Quaternion.LookRotation(target - transform.position);
// 求以origin为原点, locX, locY, locZ 为坐标轴的本地坐标系中的向量 vec 在世界坐标系中对应的向量
private Vector3 transformVecter(Vector3 vec, Vector3 origin, Vector3 locX, Vector3 locY, Vector3 locZ)
return vec.x * locX + vec.y * locY + vec.z * locZ + origin;
说明: CameraController 脚本组件挂在 MainCamera 游戏对象上。
2)PlayerController
PlayerController.cs
using System;
using UnityEngine;
public class PlayerController : MonoBehaviour
private Transform firePoint; // 开火点
private GameObject bulletPrefab; // 炮弹预设体
private float tankMoveSpeed = 4f; // 坦克移动速度
private float tankRotateSpeed = 2f; // 坦克转向速度
private float fireWaitTime = float.MaxValue; // 距离上次开火已等待的时间
private float bulletCoolTime = 0.15f; // 炮弹冷却时间
private void Start()
firePoint = transform.Find("Top/Gun/FirePoint");
bulletPrefab = (GameObject) Resources.Load("Prefabs/Bullet");
private void Update()
fireWaitTime += Time.deltaTime;
float hor = Input.GetAxis("Horizontal");
float ver = Input.GetAxis("Vertical");
Move(hor, ver);
if (Input.GetMouseButtonDown(0) || Input.GetKeyDown(KeyCode.Space))
Fire();
private void Move(float hor, float ver) // 坦克移动
if (Math.Abs(hor) > 0.1f || Math.Abs(ver) > 0.1f)
GetComponent<Rigidbody>().velocity = transform.forward * tankMoveSpeed * ver;
GetComponent<Rigidbody>().angularVelocity = Vector3.up * tankRotateSpeed * hor;
private void Fire() // 开炮
if (fireWaitTime > bulletCoolTime)
BulletInfo bulletInfo = new BulletInfo("PlayerBullet", Color.red, transform.forward, 10f, 15f);
GameObject bullet = Instantiate(bulletPrefab, firePoint.position, Quaternion.identity);
bullet.AddComponent<BulletController>().SetBulletInfo(bulletInfo);
fireWaitTime = 0f;
说明: PlayerController 脚本组件挂在 Player 游戏对象上。
3)EnemyController
EnemyController.cs
using UnityEngine;
using UnityEngine.UI;
public class EnemyController : MonoBehaviour
private Transform target; // 目标
private Transform top; // 炮头
private Transform firePoint; // 开火点
private Transform hp; // 血条
private GameObject bulletPrefab; // 炮弹预设体
private float rotateSpeed = 0.4f; // 坦克转向速度
private float fireWaitTime = float.MaxValue; // 距离上次开火已等待的时间
private float bulletCoolTime = 1f; // 炮弹冷却时间
private void Start ()
target = GameObject.Find("Player/Top").transform;
top = transform.Find("Top");
firePoint = transform.Find("Top/Gun/FirePoint");
hp = transform.Find("HP");
bulletPrefab = (GameObject) Resources.Load("Prefabs/Bullet");
private void Update ()
fireWaitTime += Time.deltaTime;
LookAtTarget();
float angle = Vector3.Angle(target.position - top.position, top.forward);
if (LookAtTarget())
Fire();
HPLookAtCamera();
private bool LookAtTarget()
Vector3 dir = target.position - top.position;
float angle = Vector3.Angle(dir, top.forward);
if (angle > 5)
int axis = Vector3.Dot(Vector3.Cross(dir, top.forward), Vector3.up) > 0 ? -1 : 1;
GetComponent<Rigidbody>().angularVelocity = axis * Vector3.up * rotateSpeed;
return false;
GetComponent<Rigidbody>().angularVelocity = Vector3.zero;
return true;
private void HPLookAtCamera()
Vector3 cameraPos = Camera.main.transform.position;
Vector3 target = new Vector3(cameraPos.x, hp.position.y, cameraPos.z);
hp.LookAt(target);
private void Fire()
if (fireWaitTime > bulletCoolTime)
BulletInfo bulletInfo = new BulletInfo("EnemyBullet", Color.yellow, top.forward, 5f, 10f);
GameObject bullet = Instantiate(bulletPrefab, firePoint.position, Quaternion.identity); // 通过预设体创建炮弹
bullet.AddComponent<BulletController>().SetBulletInfo(bulletInfo);
fireWaitTime = 0;
说明: EnemyController 脚本组件挂在 Enemy 游戏对象上。
4)BulletController
BulletController.cs
using UnityEngine;
using UnityEngine.UI;
public class BulletController : MonoBehaviour
private BulletInfo bulletInfo; // 炮弹信息
private volatile bool isDying = false;
private void Start ()
gameObject.name = bulletInfo.name;
GetComponent<MeshRenderer>().material.color = bulletInfo.color;
float lifeTime = bulletInfo.fireRange / bulletInfo.speed; // 存活时间
Destroy(gameObject, lifeTime);
private void Update ()
transform.GetComponent<Rigidbody>().velocity = bulletInfo.flyDir * bulletInfo.speed;
private void OnCollisionEnter(Collision other)
if (isDying)
return;
if (IsHitEnemy(gameObject.name, other.gameObject.name))
other.transform.Find("HP/Health").GetComponent<Image>().fillAmount -= 0.1f;
isDying = true;
Destroy(gameObject, 0.1f);
else if (IsHitPlayer(gameObject.name, other.gameObject.name))
GameObject.Find("PlayerHP/Panel/Health").GetComponent<Image>().fillAmount -= 0.1f;
isDying = true;
Destroy(gameObject, 0.1f);
public void SetBulletInfo(BulletInfo bulletInfo)
this.bulletInfo = bulletInfo;
private bool IsHitEnemy(string name, string otherName) // 射击到敌军
return name.Equals("PlayerBullet") && otherName.Equals("Enemy");
private bool IsHitPlayer(string name, string otherName) // 射击到玩家
return name.Equals("EnemyBullet") && otherName.Equals("Player");
说明: BulletController 脚本组件挂在 Bullet 游戏对象上(代码里动态添加)。
5)BulletInfo
BulletInfo.cs
using UnityEngine;
public class BulletInfo
public string name; // 炮弹名
public Color color; // 炮弹颜色
public Vector3 flyDir; // 炮弹飞出方向
public float speed; // 炮弹飞行速度
public float fireRange; // 炮弹射程
public BulletInfo(string name, Color color, Vector3 flyDir, float speed, float fireRange)
this.name = name;
this.color = color;
this.flyDir = flyDir;
this.speed = speed;
this.fireRange = fireRange;
4 运行效果
声明:本文转自【Unity3D】血条(HP)
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