flowarrowsublayer.h File Reference

Direction-only flow-arrow sublayer for 2D results animation. More...

#include "render/isublayer.h"
#include "render/sublayerstyle.h"
#include "render/colorramp.h"
#include <QColor>
#include <QJsonObject>
#include <QString>

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Classes
class	OpenSWMM::Render::FlowArrowStyle
class	OpenSWMM::Render::FlowArrowSublayer

Namespaces
namespace	OpenSWMM
namespace	OpenSWMM::Render

Detailed Description

Direction-only flow-arrow sublayer for 2D results animation.

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

    Sits alongside VelocityVectorSublayer in the 2D results mix.
    The difference is intent: VelocityVectorSublayer encodes
    magnitude as glyph length so the user can see how fast water
    moves; FlowArrowSublayer renders fixed-length arrows on a
    regular sample grid so the user can read flow *direction* at a
    glance regardless of magnitude (cleaner pattern reading at
    scale, particularly for shallow flow with tiny |v|).

    Dynamic — isDynamic() == true. The renderer rebuilds the arrow
    field on every animation tick.