cocosCreator实现两种效果转盘抽奖

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前言： cocosCreator实现两种效果转盘抽奖。

今天完成策划给的2个抽奖需求，我把核心逻辑提取出来并拓展了一个功能更丰富的效果，抛砖引玉分享出来。
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一、转盘抽奖

A：使用cc.tween().to功能+缓动函数实现旋转。
优点：简单易懂，方便控制。
缺点：功能单一

B：使用适应对时间的插值计算 + cc.tween().by 。
奖励展示跟随指针选中效果
使用了es6写法，对于页游可能在部分浏览器上不支持（比如360的兼容模式），可改成es写法

二、轮询抽奖

同样使用了2中方式实现。

三、代码展示（展示转盘抽奖B方案）

节点树和脚本挂载

GameControl脚本

import GoLuckDraw from "./GoLuckDraw";const { ccclass, property } = cc._decorator;@ccclass
export default class GameControl extends cc.Component {@property(cc.Node)public RewardPre: cc.Node = null;   //奖励预制节点  public AwardNode: cc.Node;         //奖励父节public Pointer: cc.Node;           //指针public LuckDraw: GoLuckDraw;       //旋转组件public rewardCount: number = 12;                     //奖品个数      public avgAngle: number = 360 / this.rewardCount;   //平均角度private angleStep = Math.PI * 2 / this.rewardCount; //平均弧度private radius: number = 240;                       //半径private curIndex: number = 0;    //当前奖励下标private tagetIndex: number = 0;  //目标奖励下标private reawadArr: Array<Number> = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ,10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33];  //奖品名称onLoad() {this.AwardNode = cc.find("ZhuanPanRoot/BackGround/AwardNode", this.node);this.Pointer = cc.find("ZhuanPanRoot/BackGround/CentreNode/Pointer", this.node);this.LuckDraw = cc.find("ZhuanPanRoot", this.node).getComponent(GoLuckDraw);}start() {this._InitAwardPre();}private _InitAwardPre() {for (let i = 0; i < this.rewardCount; i++) {const angle = i * this.angleStep; // 计算当前点的角度  const x = this.radius * Math.cos(angle); // 使用余弦计算x偏移量        const y = this.radius * Math.sin(angle); // 使用正弦计算y偏移量  let rewardPre = cc.instantiate(this.RewardPre);rewardPre.x = y, rewardPre.y = x;rewardPre.parent = this.AwardNode;rewardPre.active = true;rewardPre.getChildByName('label').getComponent(cc.Label).string = i.toString();}}//开始抽奖private isTurnIng = false;public BtnCallBack() {if (this.isTurnIng) {return;}this.isTurnIng = true;let awardIndex = Math.floor(Math.random() * this.rewardCount);this.tagetIndex = awardIndex;console.log("========>>>>", awardIndex, this.reawadArr[awardIndex]);this.LuckDraw.StartLuckDraw(this, this.curIndex, this.tagetIndex, 4, 4);this.LuckDraw.CompleteCallBack = () => {this.curIndex = this.tagetIndex;this.isTurnIng = false;}}// update (dt) {}
}

GoLuckDraw

import GameControl from "./GameControl";const { ccclass, property } = cc._decorator;@ccclass
export default class GoLuckDraw extends cc.Component {public CompleteCallBack: () => void;private EndDarwTick: number = 2;    //最后一轮的秒数为2秒;private CurIndex: number;           //起始位置private StopIndex: number;          //停止位置private Allticks: number;           //总秒数private MaxCount: number;           //轮数private MainThis: GameControl;private ByAngle: number;onLoad() {}/*** * @param curIndex   起始位置* @param stopIndex  结束位置* @param allticks   总时长* @param maxCount      轮次*/public StartLuckDraw(gameControl: GameControl, curIndex: number, stopIndex: number, allticks: number, maxCount: number) {this.MainThis = gameControl;this.ByAngle = this.MainThis.avgAngle * -1;this.CurIndex = curIndex;this.StopIndex = stopIndex + this.MainThis.rewardCount;this.Allticks = allticks > 3 ? allticks : 3;this.MaxCount = maxCount;this.LuckDrawRounds();}private async LuckDrawRounds() {let time1 = 0, time2 = 0;let sumCount = this.MaxCount * this.MainThis.rewardCount;let avgTime = (this.Allticks - this.EndDarwTick) / sumCount;  //平均时间for (let i = this.CurIndex; i < sumCount; i++) {time1 = cc.misc.lerp(0, avgTime * 2, (1 / sumCount) * (i + 1));cc.tween(this.MainThis.Pointer).by(time1, { angle: this.ByAngle }).start();this.SetAwardState(i);await this.SleepTime(time1);}avgTime = this.EndDarwTick / this.StopIndex;for (let i = 0; i < this.StopIndex; i++) {time2 = cc.misc.lerp(time1, avgTime * 2, (1 / this.StopIndex) * (i + 1));cc.tween(this.MainThis.Pointer).by(time2, { angle: this.ByAngle  }).start();this.SetAwardState(i);await this.SleepTime(time2);}this.SetAwardState(this.StopIndex);await this.SleepTime(1);if (this.CompleteCallBack != null) {this.CompleteCallBack();}}private SleepTime(time: number): Promise<void> {return new Promise((resolve, reject) => {this.scheduleOnce(() => {resolve();}, time);})}private SetAwardState(index: number) {let _index = index % this.MainThis.rewardCount;let label: cc.Node;let lastIndex = _index - 1 < 0 ? this.MainThis.rewardCount - 1 : _index - 1;label = this.MainThis.AwardNode.children[lastIndex]?.getChildByName("label");if (label) {label.color = cc.Color.WHITE;}label = this.MainThis.AwardNode.children[_index]?.getChildByName("label");if (label) {label.color = cc.Color.RED;}}
}

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