CountingManager.cpp

class CountingManager
{
public:
    CountingManager(Canvas &c)
    {
        c.notifyOnShapeCreate([&c, this](Shape* shape)
        {   // User created a shape
            if (shape->getType() == LineCrossing::type)
            {   // Add the LineCrossing to out list
                LineCrossing *pLineCrossing = (LineCrossing*) shape;
                lineCrossings.push_back(make_pair(pLineCrossing, 0));
            }
        });
        c.notifyOnShapeDelete([&c, this](Shape* shape)
        {   // User deleted a shape
            if (shape->getType() == LineCrossing::type)
            {   // remove this LineCrossing
                auto i = find_if(lineCrossings.begin(),
                                 lineCrossings.end(),
                                 [shape](const CountingLine &item)
                {
                    return item.first == shape;
                });
                if (i != lineCrossings.end()) lineCrossings.erase(i);
            }
        });
    }

    // count people crossing with/against lines and return true for these cases
    bool evaluatePerson(const SimulatedPerson &person)
    {
        for (CountingLine &lineCrossing : lineCrossings)
        {
            int res = lineCrossing.first->isCrossedBySegment(person.getFromPos(),
                                                             person.getCurrentPos());
            lineCrossing.second += res;
            lineCrossing.first->setName(CCV_STR("Line was crossed: " << lineCrossing.second << " times"));
            if (res) return true;
        }
        return false;
    }

private:

    typedef pair<LineCrossing*,int> CountingLine;
    list<CountingLine> lineCrossings;
};