https://www.script-tutorials.com/how-to-create-water-drops-effect-using-html5-canvas/

https://www.script-tutorials.com/demos/97/index.html

https://github.com/ecomfe/echarts

http://highcharts.codeplex.com/

https://github.com/jgraph/jgraphx

https://jgraph.github.io/mxgraph/docs/manual.html

http://jgraph.github.io/mxgraph/

Rain & Water Effects(只在谷歌浏览器有效)

http://tympanus.net/Development/RainEffect/#slide-1

示例(http://tympanus.net/Development/RainEffect/)

源码(http://tympanus.net/Development/RainEffect/RainEffect.zip)

https://www.scirra.com/blog/125/internet-explorer-11-webgl-and-more

Step 1. HTML

As usual, we start with the HTML.

This is our main page code with all samples.

index.html

<!DOCTYPE html>

<html>

    <head>

        <meta charset=utf-8 />

        <title>Water drops effect</title>

        <link rel="stylesheet" href="css/main.css" type="text/css" />

        <script src="js/vector2d.js" type="text/javascript" charset="utf-8"></script>

        <script src="js/waterfall.js" type="text/javascript" charset="utf-8"></script>

    </head>

    <body>

        <div class="example">

            <h3><a href="#">Water drops effect</a></h3>

            <canvas id="water">HTML5 compliant browser required</canvas>

            <div id="switcher">

                <img onclick='watereff.changePicture(this.src);' src="data_images/underwater1.jpg" />

                <img onclick='watereff.changePicture(this.src);' src="data_images/underwater2.jpg" />

            </div>

            <div id="fps"></div>

        </div>

    </body>

</html>

　　

Step 2. CSS

Here are used CSS styles.

css/main.css

body{background:#eee;margin:0;padding:0}

.example{background:#FFF;width:600px;border:1px #000 solid;margin:20px auto;padding:15px;-moz-border-radius: 3px;-webkit-border-radius: 3px}

#water {

    width:500px;

    height:400px;

    display: block;

    margin:0px auto;

    cursor:pointer;

}

#switcher {

    text-align:center;

    overflow:hidden;

    margin:15px;

}

#switcher img {

    width:160px;

    height:120px;

}

　　

Step 3. JS

Here are our main control JS file.

js/main.js

function drop(x, y, damping, shading, refraction, ctx, screenWidth, screenHeight){

    this.x = x;

    this.y = y;

    this.shading = shading;

    this.refraction = refraction;

    this.bufferSize = this.x * this.y;

    this.damping = damping;

    this.background = ctx.getImageData(0, 0, screenWidth, screenHeight).data;

    this.imageData = ctx.getImageData(0, 0, screenWidth, screenHeight);

    this.buffer1 = [];

    this.buffer2 = [];

    for (var i = 0; i < this.bufferSize; i++){

        this.buffer1.push(0);

        this.buffer2.push(0);

    }

    this.update = function(){

        for (var i = this.x + 1, x = 1; i < this.bufferSize - this.x; i++, x++){

            if ((x < this.x)){

                this.buffer2[i] = ((this.buffer1[i - 1] + this.buffer1[i + 1] + this.buffer1[i - this.x] + this.buffer1[i + this.x]) / 2) - this.buffer2[i];

                this.buffer2[i] *= this.damping;

            } else x = 0;

        }

        var temp = this.buffer1;

        this.buffer1 = this.buffer2;

        this.buffer2 = temp;

    }

    this.draw = function(ctx){

        var imageDataArray = this.imageData.data;

        for (var i = this.x + 1, index = (this.x + 1) * 4; i < this.bufferSize - (1 + this.x); i++, index += 4){

            var xOffset = ~~(this.buffer1[i - 1] - this.buffer1[i + 1]);

            var yOffset = ~~(this.buffer1[i - this.x] - this.buffer1[i + this.x]);

            var shade = xOffset * this.shading;

            var texture = index + (xOffset * this.refraction  + yOffset * this.refraction * this.x) * 4;

            imageDataArray[index] = this.background[texture] + shade;

            imageDataArray[index + 1] = this.background[texture + 1] + shade;

            imageDataArray[index + 2] = 50 + this.background[texture + 2] + shade;

        }

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

    }

}

var fps = 0;

var watereff = {

    // variables

    timeStep : 20,

    refractions : 2,

    shading : 3,

    damping : 0.99,

    screenWidth : 500,

    screenHeight : 400,

    pond : null,

    textureImg : null,

    interval : null,

    backgroundURL : 'data_images/underwater1.jpg',

    // initialization

    init : function() {

        var canvas = document.getElementById('water');

        if (canvas.getContext){

            // fps countrt

            fps = 0;

            setInterval(function() {

                document.getElementById('fps').innerHTML = fps / 2 + ' FPS';

                fps = 0;

            }, 2000);

            canvas.onmousedown = function(e) {

                var mouse = watereff.getMousePosition(e).sub(new vector2d(canvas.offsetLeft, canvas.offsetTop));

                watereff.pond.buffer1[mouse.y * watereff.pond.x + mouse.x ] += 200;

            }

            canvas.onmouseup = function(e) {

                canvas.onmousemove = null;

            }

            canvas.width  = this.screenWidth;

            canvas.height = this.screenHeight;

            this.textureImg = new Image(256, 256);

            this.textureImg.src = this.backgroundURL;

            canvas.getContext('2d').drawImage(this.textureImg, 0, 0);

            this.pond = new drop(

                this.screenWidth,

                this.screenHeight,

                this.damping,

                this.shading,

                this.refractions,

                canvas.getContext('2d'),

                this.screenWidth, this.screenHeight

            );

            if (this.interval != null){

                clearInterval(this.interval);

            }

            this.interval = setInterval(watereff.run, this.timeStep);

        }

    },

    // change image func

    changePicture : function(url){

        this.backgroundURL = url;

        this.init();

    },

    // get mouse position func

    getMousePosition : function(e){

        if (!e){

            var e = window.event;

        }

        if (e.pageX || e.pageY){

            return new vector2d(e.pageX, e.pageY);

        } else if (e.clientX || e.clientY){

            return new vector2d(e.clientX, e.clientY);

        }

    },

    // loop drawing

    run : function(){

        var ctx = document.getElementById('water').getContext('2d');

        watereff.pond.update();

        watereff.pond.draw(ctx);

        fps++;

    }

}

window.onload = function(){

    watereff.init();

}

　　

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