Qt add points one by one with QThread or QTimer? - qt

Question

I want to make a program in Qt to add points one by one, not all at once. To do that, I need to use QThread, or I can just use QTimer?

Answer 1

it can be done using QTimer and if it is time dependent (like every 1 second) then its the way to go. just create the timer, connect its timeout signal to your slot and it should work like a charm

Answer 2

You need create some class, inherited from QObject:
class QTimer;
class QList;
class Test_Timer : public QObject
{
Q_OBJECT
public:
explicit Test_Timer(QObject *parent = 0);
~Test_Timer();
private:
QList<QPoint> *lst;
QTimer *timer;
public slots:
void addPoint();
};
Ok, now we have timer variable for QTimer events, lst for store QPoint and addPoint() slot for handling your timer event.
At constructor we initialize members of class, connect timer's slot with current class slot and start timer with period 500ms:
Test_Timer::Test_Timer(QObject *parent) : QObject(parent)
{
lst = new QList<QPoint>;
timer = new QTimer;
connect(timer, SIGNAL(timeout()), this, SLOT(addPoint()));
timer->start(500);
}
Slot for adding points may look something like this:
void Test_Timer::addPoint()
{
static int number = 0;
if (lst->size() < 10) {
lst->append(QPoint(0, number++));
qDebug() << lst->size();
} else {
timer->stop();
deleteLater();
}
}
After all don't remember free resources:
Test_Timer::~Test_Timer()
{
lst->clear();
delete lst;
if (timer->isActive())
timer->stop();
delete timer;
}
I think this example will be helpful for you.