程序员的浪漫-桃心表白 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>粒子特效</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }

    #canvas {
        background-color: #000;
    }

    body {
        overflow: hidden;
    }
</style>

<body>
    <canvas id="canvas">你的游览器不支持canvas</canvas>
</body>
<script>
    var canvas = document.getElementById("canvas");
    var ctx = canvas.getContext('2d');
    var arrList = [];

    function init() {
        canvas.width = window.innerWidth
        canvas.height = window.innerHeight
    }
    window.onresize = init
    init()
    function random(max, min) {
        return (max - min) * Math.random() + min; //平均值
    }
    //构造函数，创建球形对象
    function Ball(x, y) {
        this.x = x;
        this.y = y;
        this.r = 30;
        this.vx = random(5, -5);
        this.vy = random(5, -5);
        this.colorList = ['red', 'yellow', 'white', 'green', 'pink'];
        this.color = this.colorList[Math.floor(random(0, 6))];
        this.a = 1;
        this.va = 0.969
    }
    Ball.prototype = {
        updata: function () {
            this.x += this.vx;
            this.y += this.vy;
            this.a *= this.va;
        },
        draw: function () {
            ctx.beginPath();
            // ctx.arc(this.x, this.y, this.r, 0, Math.PI * 2);
            ctx.moveTo(this.x, this.y);
            ctx.bezierCurveTo(this.x, this.y - 3, this.x, this.y - 15, this.x - 25, this.y - 15);
            ctx.bezierCurveTo(this.x - 55, this.y - 15, this.x - 55, this.y + 22.5, this.x - 55, this.y + 22.5);
            ctx.bezierCurveTo(this.x - 55, this.y + 40, this.x - 35, this.y + 62, this.x, this.y + 80);
            ctx.bezierCurveTo(this.x + 40, this.y + 62, this.x + 55, this.y + 40, this.x + 55, this.y + 22.5);
            ctx.bezierCurveTo(this.x + 55, this.y + 22.5, this.x + 55, this.y - 15, this.x + 25, this.y - 15);
            ctx.bezierCurveTo(this.x + 10, this.y - 15, this.x, this.y - 3, this.x, this.y);
            ctx.fill();
            ctx.font = "24px serif";
            ctx.fillText("热巴",this.x-25,this.y+35)
            ctx.fillStyle = this.color;
            ctx.globalAlpha = this.a;
            ctx.globalCompositeOperation = 'lighter';
            ctx.fill();
            this.updata();
        }
    }

    function main() {
        ctx.clearRect(0, 0, window.innerWidth, window.innerHeight);
        arrList.forEach(item => {
            item.draw()
        })
        requestAnimationFrame(main); //递归调用
    }
    canvas.addEventListener('mousemove', function (e) {
        creat(e.clientX, e.clientY)
    })

    function creat(x, y) {
        var temp = new Ball(x, y)
        arrList.push(new Ball(x, y))
    }
    main()
</script>

</html>

　　

 

posted @ 2022-03-03 10:30  奇函数  阅读(35)  评论(0)    收藏  举报