rulebasedrenderer.h

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#ifndef OPENSWMM_RENDER_RULEBASEDRENDERER_H
#define OPENSWMM_RENDER_RULEBASEDRENDERER_H
 
#include "render/ifeaturerenderer.h"
 
#include <QPair>
#include <QString>
 
namespace OpenSWMM::Render
{
 
class RuleBasedRenderer final : public IFeatureRenderer
{
public:
    struct Rule
    {
        QString               expression;   
        QString               label;        
        SymbolStyle           symbol;       
        QPair<double, double> scaleRange = { 0.0, 0.0 };  
    };
 
    RuleBasedRenderer() = default;
    ~RuleBasedRenderer() override = default;
 
    [[nodiscard]] const QList<Rule> &rules() const { return m_rules; }
    void setRules(QList<Rule> rules);
    void addRule(Rule r);
 
    [[nodiscard]] const SymbolStyle &fallbackSymbol() const { return m_fallback; }
    void setFallbackSymbol(SymbolStyle s) { m_fallback = std::move(s); }
 
    // IFeatureRenderer.
    [[nodiscard]] QString rendererId() const override { return QStringLiteral("rule"); }
    [[nodiscard]] SymbolStyle symbolFor(const FeatureRef &f,
                                        const QVariantMap &attrs) const override;
    [[nodiscard]] QList<LegendSymbolItem> legendSymbolItems() const override;
    [[nodiscard]] QJsonObject toJson() const override;
    void fromJson(const QJsonObject &j) override;
    [[nodiscard]] std::unique_ptr<IFeatureRenderer> clone() const override;
 
private:
    QList<Rule>  m_rules;
    SymbolStyle  m_fallback;
};
 
} // namespace OpenSWMM::Render
 
#endif // OPENSWMM_RENDER_RULEBASEDRENDERER_H