How to use vue3 to implement the brick-breaking game

Game requirements

1. Create a scene

2. Create a ball and create a bunch of hit blocks

3. Create a movable block that can control left and right movement

4. When the ball collides with the left and right upper boundaries and the moving block rebounds

5. block The game ends when the ball collides with the lower boundary

Full code

<template>

    <button @click="stop">停止</button>
    <button @click="start">游戏开始</button>
    <div style="color: red; text-align: center;font-size: 25px">score:{{scroce}}</div>

    <div class="box" :style="{width :boxWidth +"px", height:boxHeight +"px"}">
        <div class="str">{{str}}</div>
        <div class="kuaiBox">
            <div class="kuai" v-for="(item,index) in arr" :key="index" :style="{opacity :item.active ? "0":"1"}"></div>
        </div>
        <div class="ball" :style="{left :x + "px", top : y + "px", width : ball +"px", height: ball+"px"}"></div>
        <div class="bottomMove"
             :style="{left :mx + "px" , top : my + "px",width :moveBottomW +"px",height : moveBottomH+"px"  }"></div>
    </div>
</template>

<script setup>
    import {onMounted, onUnmounted, reactive, toRefs} from "vue"

    const boxWidth = 500, // 场景宽度
        boxHeight = 300, // 场景高度
        ball = 10,//小球的宽高
        moveBottomH = 5,//移动方块高度
        moveBottomW = 100//移动方块快读

    const strArr = "恭喜你,挑战成功!!"

    //用reactive 保存一些可观察信息
    const state = reactive({
        x: boxWidth / 2 - ball / 2,  // 小球x轴位置信息 计算默认位置在中间
        y: boxHeight - ball - moveBottomH, // 小球Y轴的位置信息 计算默认位置在中间
        mx: boxWidth / 2 - moveBottomW / 2, //移动方块的位置信息 计算默认位置在中间
        my: boxHeight - moveBottomH, // 移动方块y轴的的位置信息  计算默认位置在中间
        // 被打击方块的数组
        arr: Array.from({length: 50}, (_, index) => {
            return {
                index,
                active: false
            }
        }),
        str: "", // 返回挑战成功字眼
        scroce: 0 // 分数
    })
    // 用toRefs将观察对象的信息解构出来供模板使用 
    const {x, y, mx, my, arr, str, scroce} = toRefs(state)
    let timer = null, // 小球定时器
        speed = 3,// 小球速度
        map = {x: 10, y: 10},
        timer2 = null, // 挑战成功字眼显示定时器
        index = 0//挑战成功字眼续个显示的索引值

    // 挑战成功字眼续个显示的方法
    const strFun = () => {
        if (strArr.length === index) clearInterval(timer2)
        state.str += strArr.substr(index, 1)
        index++
    }

    
    //移动小球的方法  
    // 1.这里同过变量map 对象来记录坐标信息, 确定小球碰到 左右上 及移动方块是否回弹
    // 2.循环砖块检测小球碰撞到砖块消失
    const moveBall = () => {
        const {offsetTop, offsetHeight, offsetLeft, offsetWidth} = document.querySelector(".bottomMove")
        if (state.x <= 0) {
            map.x = speed
        } else if (state.x > boxWidth - ball) {
            map.x = -speed
        }
        if (state.y <= 0) {
            map.y = speed
        }
        if (state.y >= offsetTop - offsetHeight &&
            state.y <= offsetTop + offsetHeight &&
            state.x >= offsetLeft &&
            state.x < offsetLeft + offsetWidth) {
            map.y = -speed
        }
        if (state.y > boxHeight) {
            clearInterval(timer)
            alert("game over")
            window.location.reload()
        }
        Array.from(state.arr).forEach((item, index) => {
            const {
                offsetLeft,
                offsetTop,
                offsetWidth,
                offsetHeight
            } = document.querySelectorAll(".kuai")[index]
            if (state.x > offsetLeft
                && state.x < offsetLeft + offsetWidth
                && state.y > offsetTop
                && state.y < offsetTop + offsetHeight) {
                if (!state.arr[index].active) {
                    state.scroce += 100
                }
                state.arr[index].active = true
            }
        })
        if (Array.from(state.arr).every(item => item.active)) {
            clearInterval(timer)
            timer2 = setInterval(strFun, 1000)
        }
        state.x = state.x += map.x
        state.y = state.y += map.y
    }

    //移动方块左右移动方法 ,接住小球
    const bottomMove = ev => {
        if (ev.code === "Space") clearInterval(timer)
        switch (ev.key) {
            case "ArrowRight":
                state.mx += 100
                break
            case  "ArrowLeft":
                state.mx -= 100
                break
        }
        state.mx = state.mx < 0 ? 0 : state.mx
        state.mx = state.mx > boxWidth - moveBottomW ? boxWidth - moveBottomW : state.mx
    }
    // 暂停游戏
    const stop = () => {
        clearInterval(timer)
    }
    // 开始游戏 
    const start = () => {
        timer = setInterval(moveBall, 20)
    }
    
    // 绑定移动方块事件
    onMounted(() => {
        document.addEventListener("keyup", bottomMove)
    })
    // 移动出移动方块事件
    onUnmounted(() => {
        clearInterval(timer)
    })
</script>

<style>

    .bottomMove {
        width: 100px;
        height: 10px;
        background: red;
        position: absolute;
        transition-duration: 100ms;
        transition-timing-function: ease-out;
    }

    .ball {
        width: 20px;
        height: 20px;
        background-color: red;
        border-radius: 50%;
        position: absolute;
    }

    .kuaiBox {
        display: flex;
        flex-wrap: wrap;
    }

    .kuai {
        width: 30px;
        height: 10px;
        background: red;
        margin: 10px;
        transition-duration: 100ms;
        transition-timing-function: ease-in;
    }

    .str {
        text-align: center;
        font-size: 50px;
        color: red;

    }

    .box {

        justify-content: center;
        width: 500px;
        height: 500px;
        margin: 0 auto;
        position: relative;
        border: 5px solid red;
        overflow: hidden;
    }

    .picker {
        width: 50px;
        height: 50px;
    }
</style>

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