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<!doctype html>
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<title>Math.remap — Ludic</title>
<meta name="description" content="Rescale a value from one range into another.">
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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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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-math.html">Math</a> <span>›</span> <span class="here">Math.remap</span></div>
<div class="item-head">
<span class="kind-badge kind-method">method</span>
<h1 id="top">Math.remap</h1>
</div>
<code class="sig">Math.remap(v, in0, in1, out0, out1) -&gt; fixed</code>
<div class="desc"><p>Maps <code>v</code> from the input range <code>in0</code>..<code>in1</code> onto the output range <code>out0</code>..<code>out1</code>, keeping its relative position — equivalent to <code>Math.lerp(out0, out1, Math.inverse_lerp(in0, in1, v))</code>. All arguments are <code>fixed</code>. It is the one call that converts between units: a health value into a bar width, a noise sample in <code>-1..1</code> into a <code>0..255</code> shade, or a mouse position into a world coordinate. Swap the output ends to invert the mapping.</p></div>
<div class="params"><h2>Parameters</h2><div class="param" id="param-v"><code class="pname">v</code><span class="pdesc">the value to rescale</span></div><div class="param" id="param-in0"><code class="pname">in0</code><span class="pdesc">the start of the input range</span></div><div class="param" id="param-in1"><code class="pname">in1</code><span class="pdesc">the end of the input range</span></div><div class="param" id="param-out0"><code class="pname">out0</code><span class="pdesc">the start of the output range</span></div><div class="param" id="param-out1"><code class="pname">out1</code><span class="pdesc">the end of the output range</span></div></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program HealthBar {
const MAX_HP: fixed = 200.0
const BAR_WIDTH: fixed = 64.0
var hp: fixed = 150.0
handler Draw phase Render {
let width = Math.remap(hp, 0.0, MAX_HP, 0.0, BAR_WIDTH) # 48.0
}
}</pre></div>
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