RSnap.h

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#ifndef RSNAP_H
#define RSNAP_H
 
#include "core_global.h"
 
#include <QSet>
 
#include "REntity.h"
#include "RMouseEvent.h"
#include "RVector.h"
 
class RGraphicsView;
 
class QCADCORE_EXPORT RSnap {
public:
    enum Status {
        Unknown,
        Free,
        Grid,
        Endpoint,
        OnEntity,
        Center,
        Middle,
        Distance,
        Intersection,
        IntersectionManual,
        Reference,
        Perpendicular,
        Tangential,
        Coordinate,
        CoordinatePolar
    };
 
public:
    RSnap(RSnap::Status s = RSnap::Unknown) : status(s), 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() {}
 
    virtual void suspendEvent() {
        hideUiOptions();
    }
    virtual void finishEvent() {
        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