Cocos Creator 3.0 基础——常见操作

Posted 2022-11-05 许英俊

文章持续记录开发中遇到常用的功能

节点平移缩放旋转

基本操作

@ccclass('CubeScale')
export class CubeScale extends Component 

    i = 0
    j = 0

    update(deltaTime: number) 
        //平移
        this.node.translate(new Vec3(0.01, 0, 0))
        //缩放
        this.node.setScale(this.i += 0.01, 1, 1)
        //3D旋转
        if (this.j >= 360) 
            this.j = 0
        
        this.node.setRotationFromEuler(v3(this.j += 1, 0, 0))
        //2D旋转
        this.node.angle = (this.node.angle + 3) % 360
    

飞刀游戏：物体跟着圆一起旋转运动

update(deltaTime: number) 
    //飞刀盘子的目标物旋转（圆形）
    this.targetNode.angle = (this.targetNode.angle + 3) % 360
    
    //飞刀跟着目标物绕弧度一起旋转
    this.knifeNodeArray.forEach(element => 
        element.angle = (element.angle + 3) % 360
        
        //半径
        let r = this.targetNode.getComponent(UITransform).width / 2
        //弧度 = PI * 角度 / 180
        let rad = Math.PI * (element.angle - 90) / 180
        //x = x1 + Math.cos(弧度) y = y1 + Math.sin(弧度)
        element.setPosition(this.targetNode.position.x + r * Math.cos(rad), this.targetNode.position.y + r * Math.sin(rad))
    );

飞刀游戏：检测碰撞原理靠角度判断即可（只要角度符合一定间隙表示碰撞成功）如果有多个方向的判断，则要增加Math.abs()判断

this.knifeNodeArray.forEach(element => 
   if (element.angle < gap || 360 - element.angle < gap) 
       isHit = true
   
);

物体移动（刚体移动）

物体平移

let rb = this.node.getComponent(RigidBody)
let lv = v3(0, 0, 0)
rb.getLinearVelocity(lv)
lv.x = 0
lv.z = speed
rb.setLinearVelocity(lv)

物体旋转

let angle = this.node.eulerAngles
this.node.setRotationFromEuler(v3(angle.x, angle.y + 5, angle.z))

物体移动根据节点旋转而变化

let rb = this.node.getComponent(RigidBody)
let lv = v3(0, 0, 0)
rb.getLinearVelocity(lv)
Vec3.transformQuat(lv, lv, this.node.getRotation())
rb.setLinearVelocity(lv)

FPS游戏：第一人称的移动，根据aswd控制移动，qe控制视角转动

update(deltaTime: number) 
   let speed = 15
   let jumpSpeed = 5
   let cameraSpeend = 3
   let rb = this.node.getComponent(RigidBody)
   let lv = v3(0, 0, 0)
   rb.getLinearVelocity(lv)

   if (this.keyMask & (1 << 1)) 
       lv.x = 0
       lv.z = speed
   
   if (this.keyMask & (1 << 2)) 
       lv.x = 0
       lv.z = -speed
   
   if (this.keyMask & (1 << 3)) 
       lv.x = speed
       lv.z = 0
   
   if (this.keyMask & (1 << 0)) 
       lv.x = -speed
       lv.z = 0
   
   if (this.keyMask & (1 << 4)) 
       lv.y = jumpSpeed
       lv.z = 0
   

   let angle = this.node.eulerAngles

   if (this.keyMask & (1 << 5)) 
       this.node.setRotationFromEuler(v3(angle.x, angle.y + cameraSpeend, angle.z))
    else if (this.keyMask & (1 << 6)) 
       this.node.setRotationFromEuler(v3(angle.x, angle.y - cameraSpeend, angle.z))
   

   Vec3.transformQuat(lv, lv, this.node.getRotation())

   if (!this.keyMask) 
       lv.x = 0
       lv.z = 0
   

   rb.setLinearVelocity(lv)

打开2D碰撞Debug

PhysicsSystem2D.instance.debugDrawFlags = EPhysics2DDrawFlags.Aabb |
    EPhysics2DDrawFlags.Pair |
    EPhysics2DDrawFlags.CenterOfMass |
    EPhysics2DDrawFlags.Joint |
    EPhysics2DDrawFlags.Shape;

2D粒子系统播放

制作好的2D粒子ParticleSystem2D记得选择Layer为UI_2D，否则看不到效果

_boom(pos, color) 
    let ps: ParticleSystem2D = this.boom.getComponent(ParticleSystem2D)
    this.boom.setPosition(pos)
    if (color != undefined) 
        ps.startColor = ps.endColor = color
    
    ps.resetSystem()

骨骼动画播放

let skeletalAnimation = this.node.getComponent(SkeletalAnimation);
let clip = skeletalAnimation.clips[3]
skeletalAnimation.crossFade(clip.name, 0.3)

缓冲系统

缓冲系统主要是针对路径不固定的移动

tween()
    .target(this.node)
    .to(0.4,  position: new Vec3(0, -view.getFrameSize().height), eulerAngles: v3(5, -100, 10) ,  easing: 'linear' ) //平移和旋转
    .delay(1.0)
    .call(()=> 
        //动作完成回调
        
    )
    .start()

持久化存储

写在WebView的本地存储

localStorage.setItem("name", "hensen")
localStorage.getItem("name")

定时器

5s执行一次，无限循环执行

start() 
   this.schedule(this._changeEnemy, 5, macro.REPEAT_FOREVER)


_changeEnemy() 

2s执行一次，且只有一次

this.scheduleOnce(function() 

, 2);

声音播放

将声音部分全部保存声音管理组件中，并设置好AudioClip属性，对外提供接口进行播放

interface IAudioBean 
   [name: string]: AudioClip


@ccclass('AudioManager')
export class AudioManager extends Component 

   @property([AudioClip])
   audios: AudioClip[] = []

   beans: IAudioBean = 

   source: AudioSource = null

   start() 
       this.source = this.getComponent(AudioSource)
       for (let index = 0; index < this.audios.length; index++) 
           const element = this.audios[index];
           this.beans[element.name] = element
       
   

    //对外提供接口播放
   play(name) 
       const audio = this.beans[name]
       if (audio !== undefined) 
           this.source.playOneShot(audio)
       
   

使用播放

@property(AudioManager)
audioManager: AudioManager = null
    
this.audioManager.play("player")

动态图片加载

SpriteFrame动态加载资源中的图片，有个前提条件，图片必须存放在asset/resources目录下

resources.load("image/magnet_tool/spriteFrame", SpriteFrame, (err, spriteFrame) => 
    this.tool.spriteFrame = spriteFrame;
);

场景加载

director.loadScene("game.scene")

画布背景透明

这里踩了很多坑，最后发现只要勾选配置项目的设置即可，不需要多于的任何代码。