微信小游戏 幸运转盘

代码：https://gitee.com/wolfdong7/cocos_lucky_table/tree/master

asd.png
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const {ccclass, property} = cc._decorator;

@ccclass
export default class NewClass extends cc.Component {

@property(cc.Label)
result:cc.Label = null;

@property(cc.Node)
running_item:cc.Node = null;

@property(cc.Node)
item_root:cc.Node = null;

start_index = 0;        //开始的位置
end_index = 0;          //结束的位置
is_running = false;     //是否在运行   
road_set = null;        //路劲的设置
next_step = null;
walk_time = 0;
passed_time = 0;

max_v = 3000;   //最快速度
min_v = 120;    //最慢速度
v = 0;          //当前速度
a_v = 0;        //加速度
s_v = 0;        //减速度


lucky_result = ["￥5元", "Iphone 8", "￥2元", "￥100元话费", "房卡x10", "￥3元", "Iphone 8", 
"房卡x5", "￥100元", "￥10元话费", "￥2元", "￥50元话费"];
// LIFE-CYCLE CALLBACKS:

// onLoad () {}

start () {
    this.is_running = false;
   
    var pos = this.item_root.children[0].getPosition();
    this.running_item.setPosition(pos);
}

btn_run(){
    console.log('btn run');
    if (this.is_running) {
        return;
    }
    // 生成我们的结果:  --> 发到我们的服务器上的 不做抽奖的服务器 随机生成一个结果;
    var ret = Math.random() * 12; // [0, 1)
    ret = Math.floor(ret);
    
    this.result.string = "剧透:"+this.lucky_result[ret];
    this.show_result_anim(ret);
}

show_result_anim(ret){
    //每次转动至少3圈
    var round = 3;

    this.road_set = []; // --->    最后 停下来了；

    for(var i = 0; i < round; i ++) {
        for(var j = this.start_index; j < this.item_root.childrenCount; j ++) {
            this.road_set.push(this.item_root.children[j].getPosition());
        }

        for(var j = 0; j < this.start_index; j ++) {
            this.road_set.push(this.item_root.children[j].getPosition());
        }
    }

    this.end_index = ret;

    //判断结束的位置和起始的位置,好规划好路线
    if (this.end_index < this.start_index) 
    {
        for(var j = this.start_index; j < this.item_root.childrenCount; j ++) {
            this.road_set.push(this.item_root.children[j].getPosition());
        }

        for(var j = 0; j <= this.end_index; j ++) {
            this.road_set.push(this.item_root.children[j].getPosition());
        }
    }
    else 
    {
        for(var j = this.start_index; j <= this.end_index; j ++) {
            this.road_set.push(this.item_root.children[j].getPosition());
        }
    }

    //设置好其实位置
    this.running_item.setPosition(this.road_set[0]);
    this.next_step = 1; 
    this.v = this.min_v;
    this.a_v = (this.max_v - this.min_v) / this.road_set.length * 3; //每次速度增加(减少)这么多,先加速，后减速
    this.s_v = (this.max_v - this.min_v) / this.road_set.length * 3/2; //每次速度增加(减少)这么多,先加速，后减速
    console.log("加速度：",this.a_v);
    console.log("总共路程：",this.road_set.length);
    this.walk_to_next();
}

walk_to_next() {
    if (this.next_step >= this.road_set.length) {
        this.start_index = this.end_index;
        this.is_running = false;
        this.v = this.min_v;
        return;
    }

    this.is_running = true;
    var src = this.running_item.getPosition();
    var dst = this.road_set[this.next_step];
    var dir = dst.sub(src);//两个向量相减
    var len = dir.mag();//计算其长度

    this.walk_time = len / this.v;
    this.passed_time = 0;
    
}


update (dt) {
    if (this.is_running === false) {
        
        return;
    }

    this.passed_time += dt;
    if (this.passed_time >= this.walk_time) {
        
        this.running_item.setPosition(this.road_set[this.next_step]); 

        
        if(this.next_step <= (this.road_set.length/3))
        {
            this.v += this.a_v;
        }
        else if(this.next_step > (this.road_set.length/3))
        {
            if(this.next_step == (this.road_set.length - 3))
            {
                this.v = this.min_v + this.s_v*2;
            }
            else
            {
                this.v -= this.s_v;
            }
            
            if(this.v < this.min_v)
            {
                this.v = this.min_v;
            }
            
        }
        this.next_step ++;
        console.log(this.v);
        
        this.walk_to_next();
    }
}

}
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