RSnap.h

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#ifndef RSNAP_H
#define RSNAP_H

#include <QSet>

#include "REntity.h"
#include "RMouseEvent.h"
#include "RVector.h"

class RGraphicsView;

class RSnap {
public:
    enum Status {
        Unknown,
        Free,
        Grid,
        Endpoint,
        OnEntity,
        Center,
        Middle,
        Distance,
        Intersection,
        IntersectionManual,
        Reference,
        Perpendicular,
        Coordinate,
        CoordinatePolar
    };

public:
    RSnap() : status(RSnap::Unknown), lastSnap(RVector::invalid) {}
    virtual ~RSnap() {}

    virtual RVector snap(
            const RVector& position,
            RGraphicsView& view,
            double range=RNANDOUBLE) = 0;

    virtual RVector snap(RMouseEvent& event) {
        return snap(event.getModelPosition(), event.getGraphicsView());
    }

    virtual void showUiOptions() {}
    virtual void hideUiOptions() {}

    QSet<REntity::Id> getEntityIds() {
        return entityIds;
    }

    RSnap::Status getStatus() const {
        return status;
    }

    RVector getLastSnap() const {
        return lastSnap;
    }

    void reset() {
        entityIds.clear();
        status = RSnap::Unknown;
        lastSnap = RVector::invalid;
    }

protected:
    QSet<REntity::Id> entityIds;
    RSnap::Status status;
    RVector lastSnap;
};

Q_DECLARE_METATYPE(RSnap*)
Q_DECLARE_METATYPE(RSnap::Status)

#endif