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32 lines
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1.8 KiB
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<title>Math.atan2 — Ludic</title>
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<meta name="description" content="The angle of the vector (x, y), in radians.">
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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.atan2</span></div>
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">Math.atan2</h1>
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<code class="sig">Math.atan2(y, x) -> fixed</code>
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<div class="desc"><p>Returns the angle in radians from the positive x-axis to the point <code>(x, y)</code>, in the full range <code>-pi</code>..<code>pi</code> — the standard way to get a heading from a direction vector. Note the argument order is <code>y</code> then <code>x</code>. Deterministic fixed-point, accurate to within about a degree.</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 heading = Math.atan2(target_y - y, target_x - x)
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}
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}</pre></div>
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