AppDimens Flutter

Version 3.2.0 · Flutter port of the AppDimens Dynamic / KMP family

Every strategy guide follows the same skeleton: what it is → calculation → how to use → why use it → when to use it → advantages & trade-offs → recommended usage — mirroring the documentation of the Kotlin family.

Strategy guides (14)

#	Strategy	Package	Guide	Dp stems
1	Scaled (default)	appdimens_flutter	scaled.md	sdp / hdp / wdp
2	Percent	appdimens_percent	percent.md	psdp / phdp / pwdp
3	Power	appdimens_power	power.md	pwsdp / pwhdp / pwwdp
4	Fluid	appdimens_fluid	fluid.md	fsdp / fhdp / fwdp
5	Auto	appdimens_auto	auto.md	asdp / ahdp / awdp
6	Diagonal	appdimens_diagonal	diagonal.md	dgsdp / dghdp / dgwdp
7	Fill (cover)	appdimens_fill	fill.md	flsdp / flhdp / flwdp
8	Fit (contain)	appdimens_fit	fit.md	ftsdp / fthdp / ftwdp
9	Interpolated	appdimens_interpolated	interpolated.md	isdp / ihdp / iwdp
10	Logarithmic	appdimens_logarithmic	logarithmic.md	logsdp / loghdp / logwdp
11	Perimeter	appdimens_perimeter	perimeter.md	prsdp / prhdp / prwdp
12	Density	appdimens_density	density.md	dsdp / dhdp / dwdp
13	Resize	appdimens_resize	resize.md	AutoResizeText, AutoResizeSquare, ResizeBound…
14	Physical units	appdimens_units	physical-units.md	mm / cm / inch converters

Every dp stem has sp twins (ssp, hsp, wsp with the strategy prefix, e.g. pssp) and no-font-scale variants (sem, hem, wem).

Cross-cutting documents

Document	Content
API-CONVENTIONS.md	Suffix grammar, inverters, facilitators, builders, Px twins, Flutter adaptations
MATHEMATICS-AND-CALCULUS.md	Formal formulas, hardcoded constants, precomputation matrix, precision policy
MODULES.md	Package graph and dependency rules
../LLMS.txt	LLM-oriented library index
../skills/SKILL.md	AI-agent workflow skill (with library-map / reference)

Decision flowchart

Need a size that grows with the screen?
│
├─ Just "bigger screen = bigger UI"          → Scaled (sdp/hdp/wdp)      ← start here
├─ Text must never overflow                  → Resize (AutoResizeText)
├─ Size as a fraction of the screen          → Percent (or literal spaceW/spaceH)
├─ Sub-linear growth on big screens          → Auto or Logarithmic
├─ Smooth clamp between min/max              → Fluid
├─ Preserve shape on extreme aspect ratios   → add the a suffix (aspect ratio)
└─ Real-world physical size                  → Units (mm/cm/inch)

Precision policy

All math runs in IEEE-754 doubles using the same constants as the Kotlin engine (ι = 0.0033333334, k = 0.0026666667, reference AR 1.78). Parity against the Kotlin formulas is verified by generated reference vectors with a tolerance far below the family's < 0.05 dp policy.