swmmlayeritem.h File Reference

Batched QGraphicsItem that renders all SWMM network geometry for one SWMMModelLayer in a single paint() call. Replaces the former approach of one QGraphicsItem per node / link / subcatchment / gage, which doesn't scale beyond tens of thousands of objects. More...

#include <QGraphicsItem>
#include <QPointer>
#include <QString>
#include <QVector>

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Classes
class	SWMMLayerItem

Detailed Description

Batched QGraphicsItem that renders all SWMM network geometry for one SWMMModelLayer in a single paint() call. Replaces the former approach of one QGraphicsItem per node / link / subcatchment / gage, which doesn't scale beyond tens of thousands of objects.

Author

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

Date

2026

Design notes

• One SWMMLayerItem per SWMMModelLayer, added to the overlay scene by SWMMModelLayer::populateScene().
• boundingRect() is the scene-space extent of the cached geometry — the scene's BSP indexes this once (cheap) and only calls paint() when the view's exposed rect intersects it.
• paint() reads the layer's SoA directly and draws each category via bucketed QPainter calls (drawLines, drawPolygon, drawEllipse loops).
• Selection highlight is a second pass over m_selectedNames.
• Per-object visibility (m_hiddenObjects) is honoured.
• Item type id is SWMMLayerItemType so the existing openswmmvisscene.cpp selection-iteration code can skip it (it's not a per-object item).