如何利用Vue和Canvas创建炫酷的时钟和倒计时应用

<template>
  <div>
    <canvas id="clockCanvas"></canvas>
  </div>
</template>

<script>
export default {
  data() {
    return {
      currentTime: null
    };
  },
  mounted() {
    this.currentTime = new Date();
    this.drawClock();
  },
  methods: {
    drawClock() {
      // 在这里实现绘制时钟的逻辑
    }
  }
};
</script>

const canvas = document.getElementById('clockCanvas');
const ctx = canvas.getContext('2d');
const width = canvas.width;
const height = canvas.height;

const hour = this.currentTime.getHours();
const minute = this.currentTime.getMinutes();
const second = this.currentTime.getSeconds();

const hourAngle = ((hour % 12) + minute / 60 + second / 3600) * 30 * Math.PI / 180;
const minuteAngle = (minute + second / 60) * 6 * Math.PI / 180;
const secondAngle = second * 6 * Math.PI / 180;

// 绘制时钟的外圆
ctx.beginPath();
ctx.arc(width / 2, height / 2, width / 2 - 10, 0, 2 * Math.PI);
ctx.lineWidth = 10;
ctx.strokeStyle = 'black';
ctx.stroke();

// 绘制时钟的时针
ctx.beginPath();
ctx.moveTo(width / 2, height / 2);
ctx.lineTo(width / 2 + Math.sin(hourAngle) * (width / 2 - 50), height / 2 - Math.cos(hourAngle) * (width / 2 - 50));
ctx.lineWidth = 6;
ctx.strokeStyle = 'black';
ctx.stroke();

// 绘制时钟的分针
ctx.beginPath();
ctx.moveTo(width / 2, height / 2);
ctx.lineTo(width / 2 + Math.sin(minuteAngle) * (width / 2 - 30), height / 2 - Math.cos(minuteAngle) * (width / 2 - 30));
ctx.lineWidth = 4;
ctx.strokeStyle = 'black';
ctx.stroke();

// 绘制时钟的秒针
ctx.beginPath();
ctx.moveTo(width / 2, height / 2);
ctx.lineTo(width / 2 + Math.sin(secondAngle) * (width / 2 - 20), height / 2 - Math.cos(secondAngle) * (width / 2 - 20));
ctx.lineWidth = 2;
ctx.strokeStyle = 'red';
ctx.stroke();

requestAnimationFrame(this.drawClock);

<template>
  <div>
    <canvas id="countdownCanvas"></canvas>
  </div>
</template>

<script>
export default {
  data() {
    return {
      remainingTime: null
    };
  },
  mounted() {
    const endTime = new Date();
    endTime.setDate(endTime.getDate() + 7);
    this.startCountdown(endTime);
    this.drawCountdown();
  },
  methods: {
    startCountdown(endTime) {
      // 在这里实现倒计时的逻辑
    },
    drawCountdown() {
      // 在这里实现绘制倒计时的逻辑
    }
  }
};
</script>

const now = new Date();
const remainingTime = Math.floor((endTime - now) / 1000);
this.remainingTime = remainingTime;

this.timer = setInterval(() => {
  if (this.remainingTime > 0) {
    this.remainingTime--;
  } else {
    clearInterval(this.timer);
  }
}, 1000);

const canvas = document.getElementById('countdownCanvas');
const ctx = canvas.getContext('2d');
const width = canvas.width;
const height = canvas.height;

ctx.font = '30px Arial';
ctx.fillStyle = 'black';
ctx.textAlign = 'center';
ctx.fillText(this.remainingTime, width / 2, height / 2);

requestAnimationFrame(this.drawCountdown);