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+<title>clamp — Ludic</title>
+<meta name="description" content="Constrain a value to the inclusive range [lo, hi].">
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+  <div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="api.html#builtins">Builtin functions</a> <span>›</span> <span class="here">clamp</span></div>
+  <div class="item-head">
+    <span class="kind-badge kind-builtin">function</span>
+    <h1 id="top">clamp</h1>
+  </div>
+  <code class="sig">clamp(v, lo, hi) -&gt; int</code>
+  <div class="desc"><p>Constrains a value to a range: it returns <code>lo</code> if <code>v</code> is below the range, <code>hi</code> if it is above, and <code>v</code> unchanged when it already lies within <code>[lo, hi]</code>. The classic use is keeping a moving object on screen or inside a grid, so its position can never run past the walls no matter how fast it moves. It saves you writing a pair of <code>if</code> checks by hand. Make sure <code>lo</code> is not greater than <code>hi</code>.</p></div>
+  <div class="params"><h2>Parameters</h2><div class="param" id="param-v"><code class="pname">v</code><span class="pdesc">the value to constrain</span></div><div class="param" id="param-lo"><code class="pname">lo</code><span class="pdesc">the lowest allowed value (inclusive)</span></div><div class="param" id="param-hi"><code class="pname">hi</code><span class="pdesc">the highest allowed value (inclusive)</span></div></div>
+  <div class="examples"><h2>Example</h2><pre data-lang="ludic">program ClampToGrid {
+  property Position { column: int = 0, row: int = 0 }
+  model Player { Position }
+
+  const GRID_WIDTH: int = 20
+  const GRID_HEIGHT: int = 15
+  const TILE_SIZE: int = 16
+
+  handler SpawnPlayer phase Start {
+    spawn Player { Position { column: 5, row: 5 } }
+  }
+
+  handler ReadInput phase Input {
+    let pressed = Input.key()
+    for (Position) in query [Position, {Player}] {
+      if pressed == 'd' { Position.column = Position.column + 1 }
+      if pressed == 'a' { Position.column = Position.column - 1 }
+      Position.column = clamp(Position.column, 0, GRID_WIDTH - 1)
+    }
+  }
+
+  handler DrawWorld phase Render {
+    Screen.clear(Color.MidnightBlue)
+    for (Position) in query [Position, {Player}] {
+      Screen.fill_rectangle(
+        x: Position.column * TILE_SIZE,
+        y: Position.row * TILE_SIZE,
+        width: TILE_SIZE,
+        height: TILE_SIZE,
+        color: Color.LimeGreen)
+    }
+    Screen.show()
+  }
+}</pre></div>
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