Check out this cool animation of a diatomic chain in action on this website:
http://lampx.tugraz.at/~hadley/ss1/phonons/1d/1d2m.php
I'm interested in extracting it, specifically to create a gif. The HTML script for the animation is visible:
var c=document.getElementById("theCanvas"); var ctx=c.getContext("2d"); ctx.lineWidth = 2;
ctx.strokeStyle="black"; ctx.fillStyle="black";
I can see the code in the browser but I'm not sure how to make use of it. Any tips?
Initially, if your goal is to acquire an animated gif of a single vibration mode, the most straightforward method would involve utilizing screen capture to create a video and subsequently converting it into an animated gif. In my case, I employed the Screenshot app on my Mac to capture the animation in MOV format and then utilized Cloud Convert to transform it into a GIF. Here is the outcome:
https://i.stack.imgur.com/dnLvb.gif
I've also isolated the code responsible for generating the animation in case you require the complete animation with controls. Please note that the animation is unrelated to MathJax, which is solely utilized for formatting equations on the page. The animation is produced using Javascript with jQuery and Flot.
var c=document.getElementById("theCanvas");
var ctx=c.getContext("2d");
ctx.lineWidth = 2;
ctx.strokeStyle="black";
ctx.fillStyle="black";
var pi = Math.PI;
var t = 0;
var d1 = [];
var d2 = [];
var d3 = [];
var M1 =1.1;
var M2 = 1;
var C = 1;
k = pi/2;
document.getElementById('ka').innerHTML=k.toPrecision(3);
dt = 0.2;
function morek(){
k+=pi/32;
if (k>pi) {k=pi;}
if (Math.abs(k)<pi/50) {k=0;}
document.getElementById('ka').innerHTML=k.toPrecision(3);
}
... (remainder of code snippet) ...
requestAnimationFrame(step);<head>
<script language="javascript" type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.js"></script>
<script language="javascript" type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/flot/0.8.3/jquery.flot.min.js"></script>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
extensions: ["tex2jax.js"],
jax: ["input/TeX","output/HTML-CSS"],
tex2jax: {inlineMath: [["$","$"],["\\(","\\)"]]}
});
</script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-MML-AM_CHTML"></script>
</head>
<div style="display: flex">
<div id="placeholder1" style="width:400px;height:300px;"></div>
<div style="margin: 25px 10px">
<div>
$\frac{M_1}{M_2}=$<span id="Mtext">1.1</span> 
<input type="button" value="-" onclick="lessM();">
<input type="button" value="+" onclick="moreM();">
</div>
<div>
$ka=$<span id="ka"></span> 
<input type="button" value="-" onclick="lessk();">
<input type="button" value="+" onclick="morek();">
</div>
</div>
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