2d like what?

tanatos

hey
i need to do a program that plots a real time graphic on a X-Y axis. the x axis needs to run constantly while the program is opened for every second. and the y axis needs to aquire a random integer with low and high limits (for example, 20 to 95) and plot that integer for every second, or milisecond linked to x axis.
i know that is possible with “q custom plot” and it needs to be done with it but i dunno how to implement that. can i use the qtimer class to generate the aleatory number while the program is running in real time?

here is my code
HEADER
@class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
void graphic(QCustomPlot *customPlot);
int randInt(int, int);
~MainWindow();

private:
Ui::MainWindow *ui;
QTimer *tempr;
};@

MAINWINDOW.CPP
@MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
graphic(ui->customPlot);
tempr = new QTimer (this);
connect(tempr, SIGNAL(timeout()), this, SLOT(function()));
timeOfFirstData = QTime::currentTime();
tempr->start(1000);
}

MainWindow::~MainWindow()
{
delete ui;
killTimer(tempr);
}

int MainWindow::function(int lw, int hh)
{
return qrand() % ((hh + 1) - lw) + lw;
}

void MainWindow::graphic(QCustomPlot *customPlot)
{
QVector<double> x, y;

QTime currentTime = QTime::currentTime();    
double timeSinceStart = timeOfFirstData.msecsTo(currentTime)/1000.0;

customPlot->addGraph();
customPlot->graph(0)->)->setData(numberOfDataPoint/(double)samplingRate,dataPoint);
customPlot->xAxis->setLabel("Time");
customPlot->yAxis->setLabel("Aleatory Integer"); 
customPlot->xAxis->setRange(timeSinceStart-(numSampleToDisplay/samplingRate),timeSinceStart);
customPlot->yAxis->setRange(20, 95);
customPlot->replot();

}@

how can i call the "function" while the program is running?
would someone give me a hand on how to implement this code?

thanks a lot!

SGaist

Hi and welcome to devnet,

@connect(tempr, SIGNAL(timeout()), this, SLOT(function()));@

This line is wrong, function() doesn't exist in your class. I would recommend that you first have a look at the "Signals & Slots" chapter of Qt's documentation.