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index.html
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<html>
<head>
<meta charset="utf-8">
<link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>☄️</text></svg>">
<link rel="canonical" href="https://gravity.plaffitt.com">
<title>Gravity by Paul Laffitte</title>
<meta name="description" content="A 2D gravitational simulation in the browser.">
<script src="https://code.createjs.com/1.0.0/createjs.min.js"></script>
<script src="index.js" charset="utf-8"></script>
<style>
body {
margin: 0;
background-color: black;
}
canvas {
display: block;
}
div#informations {
width: 100%;
position: absolute;
color: white;
}
.opacityHover {
transition: opacity 0.5s;
}
.opacityHover:hover {
opacity: 100% !important;
}
div#inputs {
position: absolute;
top: 0;
opacity: 20%;
color: white;
padding-left: 0.5em;
overflow: hidden;
}
input {
max-width: 5em;
}
h3, h4 {
margin: 0.5em 0;
}
ul {
margin: 0;
padding-left: 1.5em;
}
#toggle-inputs {
cursor: pointer;
transition: color 0.3s;
}
#toggle-inputs:hover {
color: red;
}
#copyright {
position: absolute;
bottom: 0.5em;
right: 1em;
color: white;
text-align: right;
opacity: 60%;
}
a {
color: #6666ff;
text-decoration: none;
}
a:hover {
color: yellow;
}
</style>
</head>
<body onload="init()">
<canvas id="gravity"></canvas>
<div id="inputs" class="opacityHover">
<h3>Gravity <span id="toggle-inputs">▲</span></h3>
<h4>Initial setup</h4>
<input type="number" name="initialObjects" value="300" step="100" min="0" />
<label for="initialObjects" title="number of objects to create on reset">objects</label>
<br>
<input type="number" name="initialDensity" value="1" min="0.001" />
<label for="initialDensity" title="density of objects on reset">density</label>
<br>
<input type="number" name="initialRadialSpeed" value="0" step="10" />
<label for="initialRadialSpeed" title="apply an initial radial speed to objects relative to the center of the screen">radial speed</label>
<br>
<input type="checkbox" name="uniformDistribution"/>
<label for="uniformDistribution" title="whether to distribute objects uniformly or with more density near the center of the screen">uniform distribution</label>
<br>
<input type="checkbox" name="uniformRadialSpeed" checked/>
<label for="uniformRadialSpeed" title="whether to apply the same radial speed to all objects or less speed near the center of the screen">uniform radial speed</label>
<br>
<button id="reset" title="reset all objects and camera">reset</button>
<hr>
<h4>Runtime settings</h4>
<input type="number" name="radius" value="1" min="0.1" />
<label for="radius" title="radius of newly spawned objects">spawn radius</label>
<br>
<input type="number" name="simulationSpeed" value="1" min="0" step="0.05" />
<label for="simulationSpeed" title="speed of the simulation">simulations speed</label>
<br>
<input type="number" name="resolution" value="1000" min="10" step="10" />
<label for="resolution" title="resolution of the simulation">resolution <a target="_blank" href="https://github.com/paullaffitte/gravity#resolution">(?)</a></label>
<br>
<input type="checkbox" name="showClosestObject" checked/>
<label for="showClosestObject" title="whether to an indicator of the closest object or not">show closest object</label>
<hr>
<h4>Informations</h4>
<ul>
<li>zoom level: <span id="zoomLevel"></span>%</li>
<li>objects: <span id="objects"></span></li>
<li>massive objects computed: <span id="massiveObjectsComputed"></span></li>
<li>iterations per step: <span id="iterationsPerStep"></span></li>
<li>followed object radius: <span id="followedObjectRadius"></span></li>
<li>followed object mass: <span id="followedObjectMass"></span></li>
<li>followed object speed: <span id="followedObjectSpeed"></span></li>
</ul>
</div>
<small id="copyright" class="opacityHover">
Work under
<a href="/LICENSE" target="_blank">MIT LICENSE</a>
<br>
Copyright © 2020-2021
<a href="https://plaffitt.com" target="_blank">Paul Laffitte</a>
</small>
<a href="https://github.com/paullaffitte/gravity" target="_blank" class="github-corner" title="View source on GitHub" aria-label="View source on GitHub"><svg width="80" height="80" viewBox="0 0 250 250" style="fill:#fff; color:#151513; position: absolute; top: 0; border: 0; right: 0;" aria-hidden="true"><path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path><path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path><path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body"></path></svg></a><style>.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}</style>
</body>
</html>