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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Light.gel — Ludic</title>
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<meta name="description" content="A colour cookie — later lights gel from their centre colour to this rim colour.">
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<link rel="stylesheet" href="base.css">
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<link rel="stylesheet" href="docs.css">
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</head>
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<body>
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<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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<main class="wrap item">
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-light.html">Light</a> <span>›</span> <span class="here">Light.gel</span></div>
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<div class="item-head">
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">Light.gel</h1>
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</div>
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<code class="sig">Light.gel(color)</code>
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<div class="desc"><p>Sets a **gel** (a colour cookie) for lights emitted after it: the light blends from its own <code>color</code> at the centre to this <code>color</code> at the rim, so a single light can carry a two-tone tint — a warm core cooling to a blue edge, a fire that reddens outward. Clear it with <a href="light-clear_gel"><code>Light.clear_gel</code></a> to return to a flat single-colour light. The gel rides on both <a href="light-point"><code>Light.point</code></a> and <a href="light-spot"><code>Light.spot</code></a>, and persists until cleared. Per-channel Q16.16 interpolation — deterministic.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-color"><code class="pname">color</code><span class="pdesc">the rim colour, <code>0x00RRGGBB</code></span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Demo {
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property Torch { x: int = 0, y: int = 0 }
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model Lamp { Torch }
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handler Render phase Update {
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Screen.clear(0)
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Light.ambient(Color.rgb(24, 24, 32))
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Light.gel(Color.rgb(40, 60, 160)) # cool blue rim
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Light.point(80, 60, 70, Color.rgb(255, 200, 120), 1.0) # warm core
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Light.clear_gel()
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Screen.show()
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}
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}</pre></div>
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</main>
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<script src="ludic-highlight.js"></script>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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