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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>N-Body Gravity Playground</title>
<link rel="stylesheet" href="gravity.css?v=1">
<link rel="stylesheet" href="nav.css?v=1">
</head>
<body>
<!-- ================================================
TOOLBAR (Top - Body Type Selector)
================================================ -->
<div id="toolbar">
<button class="tool-btn active" data-tool="star">
<span class="tool-icon">★</span>
<span>Star</span>
</button>
<button class="tool-btn" data-tool="planet">
<span class="tool-icon">●</span>
<span>Planet</span>
</button>
<button class="tool-btn" data-tool="blackhole">
<span class="tool-icon">◉</span>
<span>Black Hole</span>
</button>
<button class="tool-btn" data-tool="asteroids">
<span class="tool-icon">✻</span>
<span>Asteroids</span>
</button>
<button class="tool-btn" data-tool="gascloud">
<span class="tool-icon">☁</span>
<span>Gas Cloud</span>
</button>
</div>
<!-- ================================================
LEFT CONTROL PANEL
================================================ -->
<div id="control-panel">
<div class="panel-title">Gravity Controls</div>
<!-- Simulation Controls -->
<div class="section-header">Simulation</div>
<div class="ctrl-group">
<label>Gravity (G) <span class="val" id="val-g">1.00</span></label>
<input type="range" id="slider-g" min="0.01" max="5" step="0.01" value="1">
</div>
<div class="ctrl-group">
<label>Time Speed <span class="val" id="val-time">1.0x</span></label>
<input type="range" id="slider-time" min="0.1" max="10" step="0.1" value="1">
</div>
<div class="ctrl-row">
<button class="ctrl-btn play-btn active" id="btn-play">Play</button>
<button class="ctrl-btn pause-btn" id="btn-pause">Pause</button>
<button class="ctrl-btn reset-btn" id="btn-reset">Reset</button>
</div>
<!-- Presets -->
<div class="section-header">Presets</div>
<div class="ctrl-group">
<select id="preset-select">
<option value="">Load a Preset...</option>
<option value="binary">Binary Stars</option>
<option value="solar">Solar System</option>
<option value="figure8">Figure Eight</option>
<option value="galaxycollision">Galaxy Collision</option>
<option value="lagrange">Lagrange Points</option>
<option value="random">Random Chaos</option>
</select>
</div>
<!-- View Controls -->
<div class="section-header">View</div>
<div class="toggle-row">
<label for="toggle-trails">Trails</label>
<div class="toggle-switch">
<input type="checkbox" id="toggle-trails" checked>
<span class="toggle-slider"></span>
</div>
</div>
<div class="toggle-row">
<label for="toggle-gravfield">Gravity Field</label>
<div class="toggle-switch">
<input type="checkbox" id="toggle-gravfield">
<span class="toggle-slider"></span>
</div>
</div>
<div class="toggle-row">
<label for="toggle-grid">Grid</label>
<div class="toggle-switch">
<input type="checkbox" id="toggle-grid" checked>
<span class="toggle-slider"></span>
</div>
</div>
<div class="toggle-row">
<label for="toggle-2d">2D Mode</label>
<div class="toggle-switch">
<input type="checkbox" id="toggle-2d">
<span class="toggle-slider"></span>
</div>
</div>
<!-- Camera -->
<div class="section-header">Camera</div>
<div class="ctrl-row">
<button class="ctrl-btn" id="btn-follow-body">Follow Body</button>
<button class="ctrl-btn" id="btn-follow-com">Follow C.O.M</button>
</div>
<!-- Stats -->
<div class="stats-area">
<div class="stat-row">
<span>Bodies</span>
<span class="stat-val" id="stat-bodies">0</span>
</div>
<div class="stat-row">
<span>Total Energy</span>
<span class="stat-val" id="stat-energy">0</span>
</div>
</div>
</div>
<!-- ================================================
RIGHT INFO PANEL (Selected Body)
================================================ -->
<div id="info-panel">
<div class="panel-title">Selected Body</div>
<div class="body-info-row">
<span class="info-label">Type</span>
<span class="info-val" id="info-type">--</span>
</div>
<div class="body-info-row">
<span class="info-label">Mass</span>
<span class="info-val" id="info-mass">--</span>
</div>
<div class="body-info-row">
<span class="info-label">Speed</span>
<span class="info-val" id="info-speed">--</span>
</div>
<div class="body-info-row">
<span class="info-label">Position</span>
<span class="info-val" id="info-pos">--</span>
</div>
<div class="body-info-row">
<span class="info-label">Kinetic E</span>
<span class="info-val" id="info-ke">--</span>
</div>
<div class="body-actions">
<button class="ctrl-btn" id="btn-follow-selected">Follow</button>
<button class="ctrl-btn reset-btn" id="btn-delete-body">Delete</button>
</div>
</div>
<!-- ================================================
BOTTOM INFO BAR
================================================ -->
<div id="bottom-info">
<span>Bodies: <span class="val" id="bottom-bodies">0</span></span>
<span>FPS: <span class="val" id="bottom-fps">60</span></span>
<span>Speed: <span class="val" id="bottom-time">1.0x</span></span>
</div>
<!-- ================================================
PLACEMENT HINT
================================================ -->
<div id="placement-hint">Click to place · Hold for mass · Drag for velocity</div>
<!-- ================================================
BACK TO PORTAL
================================================ -->
<a id="back-btn" href="index.html">
<span>←</span> Back to Galaxy
</a>
<!-- ================================================
SCRIPTS
================================================ -->
<script type="importmap">
{
"imports": {
"three": "https://cdn.jsdelivr.net/npm/three@0.160.0/build/three.module.js",
"three/addons/": "https://cdn.jsdelivr.net/npm/three@0.160.0/examples/jsm/"
}
}
</script>
<script type="module">
import { GravityPlayground } from './js/GravityPlayground.js';
const playground = new GravityPlayground();
// Load binary stars as a nice default
playground.loadPreset('binary');
</script>
<script type="module">
import { initNavigation } from './js/nav.js?v=1';
initNavigation({ activePage: 'gravity' });
</script>
</body>
</html>