Diagonal

Strategy module: appdimens_diagonal · part of the AppDimens Flutter family

What it is

Scales by the ratio of the window diagonal to the design-baseline diagonal (611.63 dp) — a single geometric measure independent of orientation.

Calculation used

out = b × √(s_min² + s_max²) / 611.6305

Qualifier-independent: dgsdp, dghdp and dgwdp resolve identically; the default path reuses the memoized diagonalScale.

How to use

import 'package:appdimens_diagonal/appdimens_diagonal.dart';
final size = 16.dgsdp;   // same value on every axis

Why use it

One number captures the overall “size” of the window — useful for elements that should track the device class, not an axis.

When to use it

Media players, maps overlays, camera UIs — components tied to the physical window as a whole.

Advantages & trade-offs

✅ Advantages	⚠️ Trade-offs
Orientation-stable · single factor · cheap after memoization
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Recommended usage strategy

Prefer Diagonal over Scaled when rotation should not change the element size.

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AppDimens Flutter 3.2.0 — see MATHEMATICS-AND-CALCULUS.md for the formal derivation.