Now that our Job class is ready to be used, we need to create a class to manage the jobs. Please create a new class, MandelbrotCalculator. Let's see what we need in the file, MandelbrotCalculator.h:

#include <QObject> 
#include <QSize> 
#include <QPointF> 
#include <QElapsedTimer> 
#include <QList> 
 
#include "JobResult.h" 
 
class Job; 
 
class MandelbrotCalculator : public QObject 
{ 
    Q_OBJECT 
public: 
    explicit MandelbrotCalculator(QObject *parent = 0); 
    void init(QSize imageSize); 
 
private: 
    QPointF mMoveOffset; 
    double mScaleFactor; 
    QSize mAreaSize; 
    int mIterationMax; 
    int mReceivedJobResults; 
    QList<JobResult> mJobResults; 
    QElapsedTimer mTimer; 
}; 

We have already discussed mMoveOffset, mScaleFactor, mAreaSize, and mIterationMax in the previous section. We also have some new variables: