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<title>Random.range — Ludic</title>
<meta name="description" content="A random integer in the inclusive range [low, high].">
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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-random.html">Random</a> <span>›</span> <span class="here">Random.range</span></div>
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<span class="kind-badge kind-method">method</span>
<h1 id="top">Random.range</h1>
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<code class="sig">Random.range(low, high) -&gt; int</code>
<div class="desc"><p>Returns a random integer between <code>low</code> and <code>high</code>, inclusive of both ends — so <code>Random.range(low: 0, high: 3)</code> can return <code>0</code>, <code>1</code>, <code>2</code>, or <code>3</code>. Use it to place things randomly on a grid, pick from a list of options by index, or add jitter to positions and timers. The sequence is deterministic for a given seed, so call <code>Random.seed</code> first if you need reproducible runs. To pick a random <code>column</code> across a grid of width <code>GRID_WIDTH</code>, pass <code>high: GRID_WIDTH - 1</code>, since the last valid index is one less than the count.</p></div>
<div class="params"><h2>Parameters</h2><div class="param" id="param-low"><code class="pname">low</code><span class="pdesc">the smallest value that can be returned (inclusive)</span></div><div class="param" id="param-high"><code class="pname">high</code><span class="pdesc">the largest value that can be returned (inclusive)</span></div></div>
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program ScatterPickups {
property Position { column: int = 0, row: int = 0 }
model Pickup { Position }
const GRID_WIDTH: int = 20
const GRID_HEIGHT: int = 15
const TILE_SIZE: int = 16
handler SeedPickups phase Start {
Random.seed(value: 7)
for spawn_index in 0 .. 5 {
spawn Pickup {
Position {
column: Random.range(low: 0, high: GRID_WIDTH - 1),
row: Random.range(low: 0, high: GRID_HEIGHT - 1)
}
}
}
}
handler DrawWorld phase Render {
Screen.clear(Color.MidnightBlue)
for (Position) in query [Position, {Pickup}] {
Screen.fill_rectangle(
x: Position.column * TILE_SIZE,
y: Position.row * TILE_SIZE,
width: TILE_SIZE,
height: TILE_SIZE,
color: Color.Gold)
}
Screen.show()
}
}</pre></div>
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