datadefined.h File Reference

Slice BI Phase 8.13.7-α / 8.13.43-α — typed-struct carve-out of the BI.2 string-expression data-defined override mechanism. More...

#include <QJsonObject>
#include <QString>

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Classes
struct	OpenSWMM::Render::DataDefinedScalar
	Maps one numeric attribute to a scalar output range. More...

Namespaces
namespace	OpenSWMM
namespace	OpenSWMM::Render

Enumerations
enum class	OpenSWMM::Render::DDCurve : int {   OpenSWMM::Render::Linear = 0 ,   OpenSWMM::Render::Sqrt = 1 ,   OpenSWMM::Render::Log = 2 }
	Interpolation shape for DataDefinedScalar. More...

Detailed Description

Slice BI Phase 8.13.7-α / 8.13.43-α — typed-struct carve-out of the BI.2 string-expression data-defined override mechanism.

Author

Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com

Date

2026

License\n GPL-3.0-or-later

DataDefinedScalar maps one numeric feature attribute (e.g. maxDepth, geom1, area) onto a scalar output range (typically a symbol size or line width in pixels). It carries:

• attribute the SWMM attribute key to read
• valueMin / Max the attribute-value range to map from
• outMin / Max the output range (e.g. 2..14 px)
• curve interpolation shape (Linear / Sqrt / Log)

evaluate(value) clamps to [valueMin, valueMax], applies the curve, and linearly maps to [outMin, outMax]. NaN / non-finite inputs return outMin defensively.

Storage convention: each SymbolLayer::props may carry an optional "sizeData" (markers) or "widthData" (lines) payload holding a DataDefinedScalar JSON. Renderers that honour data-defined output read the struct, evaluate it against the feature's attribute map, and write the resolved number into props["size"] / props["width"] before returning the SymbolStyle from symbolFor. Painters that already read those keys then see the per-feature override transparently — no painter changes needed for static rendering.

Cross-slice: GUI_IMPLEMENTATION_PLAN.md §L.BI Phase 8.13.7-α

• Phase 8.13.43-α + §L.BI BI-MK.1 size/width controls.