Pass a parameter to new QWidget

[Blitzor DDD]

Hello!

I want to create a program, which plots graph. I am using QtCharts (thanks God its available in Qt 5.7). The idea is: there is a Widget (inher. from QWidget), I push a button and create new QWidget - window and there is plot, which is build already.
But I want to re-plot it, so I put the int-number in QLineEdit on my new QWidget and I want the graph to re-plot, but the problem is that I already created a QWidget and graph is already there..
How can I pass parameter to new QWidget in order to re-plot my graph there..?

This is code:

void Widget::plotAGraph()
{
    QVBoxLayout *vertical = new QVBoxLayout();
    QHBoxLayout *horizontal = new QHBoxLayout();
    QPushButton *ok2 = new QPushButton("Close");
    QLineEdit *plotNumber = new QLineEdit("Step Number");
    QSlider *stepp=new QSlider(Qt::Horizontal);
    horizontal->addWidget(ok2);
    horizontal->addWidget(plotNumber);
    horizontal->addWidget(stepp);
 
    QScatterSeries *series0 = new QScatterSeries();
   // series0->setName("Первое сечение");
    series0->setMarkerShape(QScatterSeries::MarkerShapeCircle);
    series0->setMarkerSize(15.0);
 
    //here is parameter of my graph__and parameter step I want to change___
    int a=1;
    for(int i=step;i<step+50;i++){
        series0->append(a, obj.A[i]);
        a++;
 
    }
    //_______________________________________________________________
 
 
    QChart *chart=new QChart;
 
    chart->addSeries(series0);
    chart->setTitle("Сечение в первом разрезе");
  //  chart->axisX()->setRange(0,90);
  //  chart->axisY()->setRange(0,100);
    chart->createDefaultAxes();
    chart->axisX()->setRange(0,90);
    chart->axisY()->setRange(0,100);
 
    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
 
 
    QWidget *newWindow=new QWidget();
    vertical->  addWidget(chartView);
    vertical->  addLayout(horizontal);
    newWindow-> setLayout(vertical);
 
    newWindow->setGeometry(300,150,0,0);
    newWindow->resize(600,500);
 
 
    newWindow->show();
 
 
    connect(ok2,SIGNAL(clicked(bool)),newWindow,SLOT(replot()));
 
}
 
void Widget::replot()
{
     //Doesnt work
  // int step = plotNumber.text().toInt();
   // how can I pass a parameter step in Loop in slot plotGraph and then to re-plot it all ?
}

void Widget::plotAGraph()
{
    QVBoxLayout *vertical = new QVBoxLayout();
    QHBoxLayout *horizontal = new QHBoxLayout();
    QPushButton *ok2 = new QPushButton("Close");
    QLineEdit *plotNumber = new QLineEdit("Step Number");
    QSlider *stepp=new QSlider(Qt::Horizontal);
    horizontal->addWidget(ok2);
    horizontal->addWidget(plotNumber);
    horizontal->addWidget(stepp);

    QScatterSeries *series0 = new QScatterSeries();
   // series0->setName("Первое сечение");
    series0->setMarkerShape(QScatterSeries::MarkerShapeCircle);
    series0->setMarkerSize(15.0);

    //here is parameter of my graph__and parameter step I want to change___
    int a=1;
    for(int i=step;i<step+50;i++){
        series0->append(a, obj.A[i]);
        a++;

    }
    //_______________________________________________________________


    QChart *chart=new QChart;

    chart->addSeries(series0);
    chart->setTitle("Сечение в первом разрезе");
  //  chart->axisX()->setRange(0,90);
  //  chart->axisY()->setRange(0,100);
    chart->createDefaultAxes();
    chart->axisX()->setRange(0,90);
    chart->axisY()->setRange(0,100);

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);


    QWidget *newWindow=new QWidget();
    vertical->  addWidget(chartView);
    vertical->  addLayout(horizontal);
    newWindow-> setLayout(vertical);

    newWindow->setGeometry(300,150,0,0);
    newWindow->resize(600,500);


    newWindow->show();
   

    connect(ok2,SIGNAL(clicked(bool)),newWindow,SLOT(replot()));

}

void Widget::replot()
{
     //Doesnt work
  // int step = plotNumber.text().toInt();
   // how can I pass a parameter step in Loop in slot plotGraph and then to re-plot it all ?
}

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in file Widget.cpp I created object of class calculation and named it obj.
In the class there is an Array A

I create a plot:

for(int i=step;i<step+50;i++){
        series0->append(a, obj.A[i]);
        a++;
          }

for(int i=step;i<step+50;i++){
        series0->append(a, obj.A[i]);
        a++;
          }

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а - step along x
А[i] - value accord. to the step

Thanks in advance!

[anda_skoa]

I am afraid I didn't understand what you are actually asking for?

You have an instance of "Widget" and you want to pass data to that object?

Cheers,
_

[Blitzor DDD]

Ok, I will try to explain.
I am using this: http://doc.qt.io/qt-5/qtcharts-scatt...t-example.html

When I push the button on QWidget open new QWidget with plot like in the article.
Then I would like to change my plot on new QWidget but the problem is when I create QWidget my plot is an argument of QWidget's object. and since then I am unable to change data of my plot.

P.S.
Or at least can I create a few graphs, independent from each other on QWidget from the start ?

[anda_skoa]

Well, can't you just keep a pointer to the object you want to change?

Cheers,
_

[Blitzor DDD]

Well, can't you just keep a pointer to the object you want to change?

I am sorry, definitely it is lack of knowledge from my side, but I see it this way: when I create new QWidget I create it with plot and in order to change it I must create new QWidget, right ?
If there is likelihood to solve it using pointer (I didnt see it in the example of off. doc.) please write a code with a pointer and interaction on its base.
Thanks

[anda_skoa]

I am sorry, definitely it is lack of knowledge from my side, but I see it this way: when I create new QWidget I create it with plot and in order to change it I must create new QWidget, right ?


No, the plot class has methods to change its data.

If there is likelihood to solve it using pointer (I didnt see it in the example of off. doc.) please write a code with a pointer and interaction on its base.

Instead of using a local variable "chartView" you use a member variable in your "Widget" class.
Then any method of "Widget" can access "chartView" and call its methods to change data.

Cheers,
_

[Blitzor DDD]

Ok dann. Ich hab nicht alles verstanden, aber sowiese vielen Dank fur Ihre Hilfe

[d_stranz]

Ok dann. Ich hab nicht alles verstanden, aber sowiese vielen Dank fur Ihre Hilfe

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