How do I make Qt graphs appear in the same window?

Question

I am working in Qt in my program. I have a widget window and I have placed a button and a list box in it. Then I have made a class called myplot which graph plotting is done. Then in my button event handler I have called the object of myplot

 myplot * p1 = new myplot(session,session ,24, "session"); // send arrays in argument containing the data to be plot 
    p1->show();
    myplot * p2 = new myplot(payload,payload ,24, "payload"); // send arrays in argument containing the data to be plot 
    p2->show();

It is working fine as my graph appear in new window, but what I want is that graphs should appear in my mainwidget window.

What I did next was to remove the title bar of my graphs window I wrote this Qt Code:

p1->setWindowFlags(Qt::FramelessWindowHint);
p2->setWindowFlags(Qt::FramelessWindowHint);

Now

1) what should I do to place and append the graphs window in my main window? Also when I close main window my graph window should close.
2) when I select an other value from the list box and click button my old graph disappear and new should appear

i drag and droped a verticlalayout then write

ui->verticalLayout->addChildWidget(p1);

but got an error

/usr/include/qt4/QtGui/qlayout.h:191: error: ‘void QLayout::addChildWidget(QWidget*)’ is protected

then i draaged and droped a scrollarea and wrote

myplot * p1 = new myplot(session,session ,24, "session");
p1->setWindowFlags(Qt::FramelessWindowHint);
ui->scrollArea->addScrollBarWidget(p1,0);
p1->show();

my graphs stopped appearing kindly guide me am i doing it wrong or what the right way

Use addWidget(), not addChildWidget(). It's clearly stated in the docs — gwohpq9
In future, if you have a new question, instead of modifying an old one (so that all of the answers become wrong and out of date) perhaps you could ask a new question? — Troyseph

king_nak king_nak · Accepted Answer · 2011-06-17T09:39:25

Apparently, myplot is a childclass of QWidget. So you can just define a layout on your main window (e.g. using QHBoxLayout), and add those two widgets to it. This will cause them to be drawn inside the mainwindow. Also make sure that you pass the main window as the QWidget parent of the plots.

For replacing the plots, you can either remove the old plots from the layout and add new ones. But I would prefer to make the plots members of your main window and include some update method that would redraw with the new data

How do I make Qt graphs appear in the same window?

3 Answers