37 lines
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2.4 KiB
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37 lines
No EOL
2.4 KiB
HTML
<!doctype html>
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<head>
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<meta charset="utf-8">
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<title>Tween.yoyo — Ludic</title>
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<meta name="description" content="A repeating 0..1..0 triangle amount over duration.">
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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-tween.html">Tween</a> <span>›</span> <span class="here">Tween.yoyo</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">Tween.yoyo</h1>
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</div>
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<code class="sig">Tween.yoyo(timer, duration) -> fixed</code>
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<div class="desc"><p>Returns a triangle wave: <code>timer / duration</code> ramps <code>0.0</code>→<code>1.0</code> over the first <code>duration</code>, then <code>1.0</code>→<code>0.0</code> over the next, and repeats. The smooth back-and-forth for a hover bob, a pulsing highlight, or a breathing scale — no snap at the ends the way <a href="tween-loop"><code>Tween.loop</code></a> has.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-timer"><code class="pname">timer</code><span class="pdesc">elapsed seconds (a <code>fixed</code>)</span></div><div class="param" id="param-duration"><code class="pname">duration</code><span class="pdesc">seconds for each leg (a <code>fixed</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 Bob { timer: fixed = 0.0 }
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model Pickup { Bob }
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handler Run phase Update {
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Bob.timer = Bob.timer + Time.delta()
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let t = Tween.yoyo(Bob.timer, fixed(1))
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let y = Tween.round(100, 108, Tween.ease(t, 3))
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print(y)
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}
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}</pre></div>
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