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33 lines
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1.9 KiB
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<title>Math.dist2 — Ludic</title>
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<meta name="description" content="Squared distance between two points.">
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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.dist2</span></div>
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">Math.dist2</h1>
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<code class="sig">Math.dist2(x0, y0, x1, y1) -> fixed</code>
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<div class="desc"><p>Returns the squared distance between <code>(x0, y0)</code> and <code>(x1, y1)</code> — <code>dx*dx + dy*dy</code>, with no square root. Comparing squared distances gives the same ordering as comparing real distances, so this is the cheaper choice for "nearest" and "within radius" tests: compare against <code>radius * radius</code> instead of calling <code>Math.dist</code>.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Demo {
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handler Step phase Update {
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let r2 = radius * radius
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if Math.dist2(px, py, ex, ey) < r2 { in_range() }
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}
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}</pre></div>
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