js实现风吹动画-html代码-BFW代码库

js实现风吹动画

代码语言：html

所属分类：动画

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">

    <style>
        html,
        body {
            margin: 0;
            padding: 0;
        }

        body {
            overflow: hidden;
            width: 100vw;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }
    </style>

</head>
<body translate="no">
    <canvas class="js-canvas"></canvas>

    <script type="text/javascript" src="http://repo.bfw.wiki/bfwrepo/js/simplex-noise.min.js"></script>
    <script>
        const simplex = new SimplexNoise();

        const getAngleBetween = (vec1, vec2) => Math.atan2(vec2.y - vec1.y, vec2.x - vec1.x);
        const randomArrayValue = arr => arr[Math.floor(Math.random() * arr.length)];

        const palettes = [
            ['#f65c78', '#ffd271', '#fff3af', '#c3f584'],
            ['#111d5e', '#b21f66', '#fe346e', '#ffbd69'],
            ['#36b5b0', '#9dd8c8', '#f09595', '#fcf5b0'],
            ['#015668', '#263f44', '#ffd369', '#fff1cf']];


        const canvas = document.querySelector('.js-canvas');
        const ctx = canvas.getContext('2d');

        const TAU = Math.PI * 2;

        const width = window.innerWidth;
        const height = window.innerHeight;

        const midX = width >> 1;
        const midY = height >> 1;

        canvas.width = width;
        canvas.height = height;

        let phase = 0;
        let phaseSpeed = 0.001;
        let noiseAmp = 0.08;

        let palette = [];
        let trails = [];
        const numTrails = 400;

        const generate = ({
            x = midX, y = midY
        } = {}) => {
            noiseAmp = 0.08;
            palette = randomArrayValue(palettes);

            trails = [];

            for (let i = 0; i < numTrails; i++) {
                const spacing = 0.5;
                const lineWidth = 3 + Math.random() * 3;
                const velocity = 10 + Math.random() * 10;
                const angle = TAU / numTrails * i;
                const numPoints = 20 + Math.random() * 5;
                const points = [];
                const life = 1;
                const color = randomArrayValue(palette);

                for (let q = 0; q < numPoints; q++) {
                    points.push({
                        x,
                        y
                    .........完整代码请登录后点击上方下载按钮下载查看