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36 lines
No EOL
2.3 KiB
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<title>Anim.pingpong — Ludic</title>
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<meta name="description" content="A frame index that bounces 0..count-1..0 and repeats.">
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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-anim.html">Anim</a> <span>›</span> <span class="here">Anim.pingpong</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">Anim.pingpong</h1>
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</div>
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<code class="sig">Anim.pingpong(timer, fps, count) -> int</code>
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<div class="desc"><p>Returns a frame index that plays forward to <code>count-1</code>, then back to <code>0</code>, then forward again — a triangle wave over the frames. Ideal for a two-way idle bob or a breathing/pulsing loop where a plain wrap would snap.</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-fps"><code class="pname">fps</code><span class="pdesc">frames per second</span></div><div class="param" id="param-count"><code class="pname">count</code><span class="pdesc">number of frames in the clip</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Demo {
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property Idle { timer: fixed = 0.0 }
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model Fish { Idle }
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handler Run phase Update {
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Idle.timer = Idle.timer + Time.delta()
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let cell = Anim.pingpong(Idle.timer, 8, 4) # 0 1 2 3 2 1 0 1 ...
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print(cell)
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}
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}</pre></div>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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