Percent

Strategy module: appdimens_percent · part of the AppDimens Flutter family

What it is

Same linear law as Scaled plus a literal percentage family that resolves exact fractions of an axis with no scaling curve.

Calculation used

$\text{text} \text{psdp} : \text{out} = \text{b} \times (\text{d} \times ι) \text{space}: \text{out} = (\text{p} / 100) \times \text{axis} $

The space* family answers “30% of the width” literally — useful for proportional dividers and grids.

How to use

import 'package:appdimens_percent/appdimens_percent.dart';
final box   = 10.psdp;      // same curve as sdp
final half  = 50.spaceW;    // 50% of the width
final band  = 25.spaceH;    // 25% of the height
final ref   = 10.spaceOf(500); // 10% of a 500 dp reference
// conditional chain
final c = DimenPercent.scaled(100).screenQualifier(DpQualifier.smallWidth, 600, 150);

Why use it

Percentages communicate intent directly; the literal family avoids the classic MediaQuery.size.width * 0.3 boilerplate and honors multi-window suppression.

When to use it

Proportional dividers, split panes, grids, hero areas sized relative to the window.

Advantages & trade-offs

✅ Advantages	⚠️ Trade-offs
Literal semantics · multi-window aware · sp twins included
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Recommended usage strategy

Prefer spaceW/spaceH for fractions of the window and psdp when you want the Scaled curve under the percent namespace (parity with the Kotlin module).

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