Multiple scenes in one QGraphicview

Ramkumar Mohan

This is my code ,

    int check = 4 ;
    for(int i=0;i<check;i++)
    {
        ui->graphicsView->setFixedSize(215 , 110);
        ui->graphicsView->setSceneRect(0,0,215,110);
        ui->graphicsView->setScene(&m_Scene);
        m_Code->setWidth(35);
        m_Code->setHeight(70);
        m_Code->setPos(15,15);
        m_Scene.addItem( m_Code );
        m_Scene.update();
        m_Code->update();
        m_Code->setText(ui->lineEdit_7->text());
        m_Code->update();
        m_Scene.update();
    }

In this m_Code means that every time the loop comes, the new shapes will be displayed in the Same QGraphicsView one by one.

I don't know how to do that,
How to display Multiple scenes in a single QGraphicsView.

JonB

@Ramkumar-Mohan said in Multiple scenes in one QGraphicview:

How to display Multiple scenes in a single QGraphicsView.

You can't, and wouldn't want to! A QGraphicsView is a view onto (an area of) one QGraphicsScene, via QGraphicsView::setScene(QGraphicsScene *scene). You can't have it view more than one scene! OTOH, it's fine to have multiple QGraphicsViews onto a single QGraphicsScene, e.g. to view different areas.

I don't know why you think you would want multiple QGraphicsScenes nor what the code you show is trying to achieve.

Ramkumar Mohan

@JonB Ok,

Header File ,

MainWindow.h

class MainWindow : public QMainWindow
{
Q_OBJECT

QGraphicsScene m_Scene;
QGraphicsScene m_Scene1;

}

CPP File ,

MainWindow.CPP
int check =2 ;
for(int i=0 ; i<check ;i++)
{
if(i==0)

                 {
                     ui->graphicsView->setFixedSize(420 , 580);
                     ui->graphicsView->setSceneRect(50,0,215,110);
                     QThread::msleep(500);
                     ui->graphicsView->setScene(&m_Scene);
                     m_Code= new Code128Item();
                     m_Code->setWidth(35);
                     m_Code->setHeight(70);
                     m_Code->setPos(50,0);
                     m_Scene.addItem( m_Code);
                     m_Scene.update();
                     m_Code->update();
                     m_Code->setText(Data);
                     m_Code->update();
                     m_Scene.update();
                     ui->graphicsView->setScene(&m_Scene);
                     ui->graphicsView->update();
                 }

else if(i==1)
{

            ui->graphicsView->setFixedSize(420 , 580);
            ui->graphicsView->setSceneRect(200,0,215,110);
            QThread::msleep(500);

            ui->graphicsView->setScene(&m_Scene1);
            m_Code->setWidth(35);
            m_Code->setHeight(70);
            m_Code->setPos(200,0);
            m_Scene1.addItem(m_Code);
            m_Scene1.update();
            m_Code->update();
            m_Code->setText("Data1");
            m_Code->update();
            m_Scene1.update();
            ui->graphicsView->setScene(&m_Scene1);
            ui->graphicsView->update();

}
}

I wrote This code ,

In this the text named data should be placed at (0,0) position, similarly the text named Data1 should be placed at (200,0) position. I don't know what is wrong with this code.

Asperamanca

@Ramkumar-Mohan
I don't see what "m_Code" is, but why not simply add two texts to one scene?

Ramkumar Mohan

@Asperamanca
m_Code Means,

MainWindow.h

class MainWindow : public QMainWindow
{
Q_OBJECT

QGraphicsScene m_Scene;
QGraphicsScene m_Scene1;
Code128Item * m_Code;

}

Asperamanca

@Ramkumar-Mohan
So just create 2 items like m_Code, instead of 2 scenes

JonB

@Ramkumar-Mohan

@JonB said in Multiple scenes in one QGraphicview:

I don't know why you think you would want multiple QGraphicsScenes

Like @Asperamanca says too.

Ramkumar Mohan

@JonB

Now , working fine , Thank You

Ramkumar Mohan

@JonB

Hi, one more doubt ,

Can multiple QGraphviews be printed to the printer one by one?

JonB

@Ramkumar-Mohan
I imagine so, why not? Certainly assuming you can print one QGraphicsView you can print many.

Ramkumar Mohan

@JonB

I am a beginner in qt and I don't really understand its concept.

Ramkumar Mohan

@Asperamanca @JonB

QGraphicsView Items should be set in this way ....

how to set the graph scale...

Thank you.

Asperamanca

@Ramkumar-Mohan
Not sure what the question here is. You can transform individual items (scale, rotate, shear), and you can do the same for the whole GraphicsView.

As for printing: You can grab a QPixmap or QImage of each GraphicsView and print it, for example.

Ramkumar Mohan

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