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2.9 KiB
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56 lines
No EOL
2.9 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>scene — Ludic</title>
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<meta name="description" content="A mutually-exclusive game state — a title screen, the overworld, a battle.">
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<link rel="stylesheet" href="base.css">
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<link rel="stylesheet" href="docs.css">
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</head>
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<body>
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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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<main class="wrap item">
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#scenes">Scenes & layers</a> <span>›</span> <span class="here">scene</span></div>
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<div class="item-head">
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<span class="kind-badge kind-keyword">keyword</span>
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<h1 id="top">scene</h1>
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</div>
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<code class="sig">scene Name [start] { on enter{} on exit{} layer … }</code>
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<div class="desc"><p>A <code>scene</code> is one of the mutually-exclusive states a game moves between — a title screen, the overworld, a battle, a shop. Exactly <b>one scene is active</b> at a time, and only the active scene's <code>layer</code> handlers run each phase; handlers declared outside any scene are global and run every frame regardless. A scene may carry an <code>on enter</code> / <code>on exit</code> pair of lifecycle hooks and one or more <code>layer</code> blocks that group its handlers. Under the hood a scene lowers to an implicit state machine the compiler writes for you (scenes number themselves by declaration order), so <code>become</code> from one scene to another costs two direct calls and a register store — no dispatch table.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program SceneExample {
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var elapsed_frames: int = 0
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scene Title start {
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on enter { elapsed_frames = 0 }
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layer Main {
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handler WaitForStart phase Update {
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elapsed_frames = elapsed_frames + 1
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if Input.key() != 0 { become Overworld }
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}
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handler DrawTitle phase Render {
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Screen.clear(Color.MidnightBlue)
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Screen.draw_text(x: 60, y: 100, text: "PRESS ANY KEY", color: Color.White, scale: 1)
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Screen.show()
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}
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}
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}
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scene Overworld {
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on enter { elapsed_frames = 0 }
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layer World {
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handler DrawWorld phase Render {
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Screen.clear(Color.MidnightBlue)
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Screen.fill_rectangle(x: 80, y: 80, width: 16, height: 16, color: Color.LimeGreen)
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Screen.show()
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}
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}
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}
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}</pre></div>
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<a class="back" href="api.html">← All symbols</a>
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</main>
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<script src="ludic-highlight.js"></script>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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</body></html> |