js实现液体流动效果-html代码-BFW代码库

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">
    <title>  Fluid Simulation</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            overflow: hidden;
        }

        body {
            background: #333;
        }

        #reset {
            position: absolute;
            left: 50%;
            top: 10px;
            margin-left: -400px;
            background: #444;
            border: 1px solid #555;
            color: #888;
            padding: 6px 10px;
            cursor: pointer;
            opacity: 0.8;
        }

        #c {
            width: 800px;
            height: 376px;
            margin: 0 auto;
            display: block;
        }

        #info {
            position: absolute;
            left: -1px;
            top: -1px;
            width: auto;
            max-width: 380px;
            height: auto;
            background: #f2f2f2;
            border-bottom-right-radius: 10px;
        }

        #top {
            background: #fff;
            width: 100%;
            height: auto;
            position: relative;
            border-bottom: 1px solid #eee;
        }

        p {
            font-family: Arial, sans-serif;
            color: #666;
            text-align: justify;
            font-size: 16px;
            margin: 10px;
        }

        a {
            font-family: sans-serif;
            color: #444;
            text-decoration: none;
            font-size: 20px;
        }

        #site {
            float: left;
            margin: 10px;
            color: #38a;
        }

        #close {
            float: right;
            margin: 10px;
        }
    </style>

</head>
<body translate="no">
    <canvas id="c"> </canvas>
    <button id="reset">new colours</button>
    <div id="info"  style="display:none;">
        <div id="top">
            <a id="close" href="">close</a>
        </div>
        <p>
            <br>
            - Alter particles/groups with the GROUPS variable.<br><br>
            - Customize colours with GROUP_COLOURS.<br><br>
            - Use the mouse to move the fluid.<br><br>
            - Click anywhere to make water.<br><br>
            - Use one group for a more water-like effect.<br><br>
        </p>
    </div>
  
    <script>
        /*
Copyright (c) 2013 dissimulate at codepen

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*/

        document.getElementById('close').onmousedown = function (e) {
            e.preventDefault();
            document.getElementById('info').style.display = 'none';
            return false;
        };

        /* Settings */

        var MOUSE_INFLUENCE = 5,
        GRAVITY_X = 0,
        GRAVITY_Y = 0,
        MOUSE_REPEL = false,
        GROUPS = [50, 50, 50],
        GROUP_COLOURS = ['rgba(97,160,232'];

        window.requestAnimFrame =
        window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function (callback) {
            window.setTimeout(callback, 1000 / 60);
        };

        var fluid = function () {

            var ctx, width, height, num_x, num_y, particles, grid, meta_ctx, threshold = 220, play = false, spacing = 45, radius = 30, limit = radius * 0.66, textures, num_particles;

            var mouse = {
                down: false,
                x: 0,
                y: 0
            };


            var process_image = function () {
                var imageData = meta_ctx.getImageData(0, 0, width, height),
                pix = imageData.data;

                for (var i = 0, n = pix.length; i < n; i += 4) {
                    pix[i + 3] < threshold && (pix[i + 3] /= 6);
                }

                ctx.putImageData(imageData, 0, 0);
            };

            var run = function () {

                //var time = new Date().getTime();
                meta_ctx.clearRect(0, 0, width, height);

                for (var i = 0, l = num_x * num_y; i < l; i++) grid[i].length = 0;


                var i = num_particles;
                while (i--) particles[i].first_process();
                i = num_particles;
                while (i--) particles[i].second_process();

                process_image();

                if (mouse.down) {

                    ctx.canvas.style.cursor = 'none';

                    ctx.fillStyle = 'rgba(97, 160, 232, 0.05)';
                    ctx.beginPath();
                    ctx.arc(
                        mouse.x,
                        mouse.y,
                        radius * MOUSE_INFLUENCE,
                        0,
                        Math.PI * 2);

                    ctx.closePath();
                    ctx.fill();

                    ctx.fillStyle = 'rgba(97, 160, 232, 0.05)';
                    ctx.beginPath();
                    ctx.arc(
                        mouse.x,
                        mouse.y,
                        radius * MOUSE_INFLUENCE / 3,
                        0,
                        Math.PI * 2);

                    ctx.closePath();
                    ctx.fill();
                } else ctx.canvas.style.cursor = 'default';

                //console.log(new Date().getTime() - time);

                if (play)
                    requestAnimFrame(run);
            };

            var Particle = function (type, x, y) {
                this.type = type;
                this.x = x;
                this.y = y;
                this.px = x;
                this.py = y;
                this.vx = 0;
                this.vy = 0;
            };

            Particle.prototype.first_process = function () {

                var g = grid[Math.round(this.y / spacing) * num_x + Math.round(this.x / spacing)];

                if (g) g.close[g.length++] = this;

                this.vx = this.x - this.px;
                this.vy = this.y - this.py;

                if (mouse.down) {
                    var dist_x = this.x - mouse.x;
                    var dist_y = this.y - mouse.y;
                    var dist = Math.sqrt(dist_x * dist_x + dist_y * dist_y);
                    if (dist < radius * MOUSE_INFLUENCE) {
                        var cos = dist_x / dist;
                        var sin = dist_y / dist;
                        this.vx += MOUSE_REPEL ? cos: -cos;
                        thi.........完整代码请登录后点击上方下载按钮下载查看