[Qt-interest] aspect-ratio for graphs

[Jason H]

1. LGPL. Don't modify libQxt and you're fine.

I think they call it the QxtLetterBox widget, which is just a container for you 
own widget. Take a look at the source and figure out what qt functions they 
used, without copying code. I like the container approach they took.




----- Original Message ----
From: phil prentice <philp.cheer at talktalk.net>
To: qt-interest at trolltech.com
Sent: Thu, July 15, 2010 4:08:56 AM
Subject: Re: [Qt-interest] aspect-ratio for graphs

Thank you very much for your responses.

1) I have a commercial license for 4.2.1 and currently am stuck with that 
version. So not sure about libqxt. I am running under Linux.

2) The graphs that I plan to display are going to be very simple and I was 
planning simple to use paintEvent to do it. Axis + plotted points.

3) I thought that it should be fairly simply to get QT to draw a 1:1 
aspect-ratio frame.  Obviously not.  Push come to shove I might have to fix 
the frame sizes, but for a powerful GUI toolkit(+lots more) I will be a 
little disappointed at that.

4) I will cut down my code and see if I can get anywhere using  
setSizePolicy() and heightForWidth() just in case I can get them to work.

Thank you very much for all your help

Phil

On Wednesday 14 July 2010 18:41, Christian Gagneraud wrote:
> On 07/14/2010 07:31 PM, Jason H wrote:
> > Check out libqxt. They have an AR aware widget, that you can put your
> > graph in.
>
> Did you have a look at qwt?
>
> "The Qwt library contains GUI Components and utility classes which are
> primarily useful for programs with a technical background [...]"
> They have lot of widgets for plots, knobs, sliders, ...
>
> http://qwt.sourceforge.net
>
> Chris
>
> > ----- Original Message ----
> > From: phil prentice<philp.cheer at talktalk.net>
> > To: qt-interest at trolltech.com
> > Sent: Wed, July 14, 2010 12:57:06 PM
> > Subject: [Qt-interest] aspect-ratio for graphs
> >
> > Hi
> >    I am sorry to say that I think that this question has been asked a few
> > times before, with varying answers.  I am trying to draw six graphs side
> > by side with a number of widgets displayed below it.  I am using
> > horizontal and vertical layouts to do this.  And yes I would like to
> > force the aspect ratio of the graphs to be 1:1.  Reading various
> > qt-interest forum answers it seemed to suggest that I could use the
> > member functions setSizePolicy() and heightForWidth()...which I have
> > tried to do with no success.
> > Is the general principle of what I am trying to do correct? Any ideas as
> > to why it does not work for me?
> >
> > Any help would be welcome....I love QT but sometimes its just too hard!!!
> >
> > Thanks
> > Phil
> >
> > I have defined a class called VIgraph() derived from QFrame() i.e.
> > VIgraph::VIgraph(QWidget *parent, Qt::WindowFlags f):QFrame(parent,f)
> > {
> >    // Create a frame around the graphs.
> >    setFrameStyle(QFrame::Box|QFrame::Plain);
> >    QSizePolicy policy(QSizePolicy::Preferred, QSizePolicy::Preferred);
> >    policy.setHeightForWidth(true);  // Keep aspect ratio
> >    setSizePolicy(policy);
> > }
> >
> > int VIgraph::heightForWidth(int w) const
> > {
> >    if(height()>  w)
> >      return w;
> >    else
> >      return height();
> > }
> >
> > My main window widget creates various widgets(including the VIgraph
> > widgets) and lays them out (see two following functions)
> >
> > void VIwindow::createWidgets()
> > {
> >    int i;
> >
> >    // Create the 6 graphs, the 6 labeled Pass/Fail labels and the 6
> > checkboxes. for(i = 0; i<  6; i++)
> >    {
> >      m_graph[i] = new VIgraph();
> >      m_graphPassFailLabel[i] = new QLabel();
> >      m_graphPassFailTextLabel[i] = new
> > QLabel(QString("VI%1Pass/Fail").arg(i)); m_graphCheckBoxs[i] = new
> > QCheckBox(QString("Select VI%1").arg(i)); }
> >    // Create Tolerance slider and tolerance checkbox along with label.
> >    m_toleranceSlider = new QSlider(Qt::Horizontal);
> >    m_toleranceLineEdit = new QLineEdit();
> >    m_toleranceCheckBox = new QCheckBox("View Tolerance");
> >    // Create Save&  Cancel pushbuttons.
> >    m_saveToleranceButton = new QPushButton(tr("Save Tol"));
> >    m_cancelToleranceButton = new QPushButton(tr("Cancel"));
> >    // Auto/Manual Combi-box.
> >    m_autoManualComboBox = new QComboBox();
> >    m_autoManualComboBox->addItem("Auto");
> >    m_autoManualComboBox->addItem("Manual");
> > // Single-shot&  Continuous pushbuttons.
> >    m_singleShotButton = new QPushButton(tr("Single Shot"));
> >    m_continuousButton = new QPushButton(tr("Continuous"));
> >
> >    // Set fixed widgets attributes.
> >    m_toleranceLineEdit->setReadOnly(true);
> >    m_toleranceSlider->setMinimum(0);
> >    m_toleranceSlider->setMaximum(100);
> >    m_toleranceSlider->setTickInterval(1);
> >
> >    QPixmap greyPixmap(":resources/images/greyButton.png"); // Default
> > pixmap QSize max(16, 16);
> >    for(i = 0; i<  6; i++)
> >    {
> >      m_graphPassFailLabel[i]->setPixmap(greyPixmap);
> >      // Set Label sizes and scale the contents.
> >      m_graphPassFailLabel[i]->setMaximumSize(max);
> >      m_graphPassFailLabel[i]->setScaledContents(true);
> >    }
> > ]
> >
> > void VIwindow::doLayout()
> > {
> >    int i;
> >
> >    // Create Pass/Fail label with text as horizontal layout.
> >    QHBoxLayout *passFailLayout[6];
> >    for(i = 0; i<  6; i++)
> >    {
> >      passFailLayout[i] = new QHBoxLayout;
> >      passFailLayout[i]->addWidget(m_graphPassFailLabel[i]);
> >      passFailLayout[i]->addWidget(m_graphPassFailTextLabel[i]);
> >      passFailLayout[i]->addStretch();
> >    }
> >    // Create the six vertical graph layouts with label.
> >    QVBoxLayout *graphLayout[6];
> >    for(i = 0; i<  6; i++)
> >    {
> >      graphLayout[i] = new QVBoxLayout;
> >      graphLayout[i]->addWidget(m_graph[i]);       // Aspect-ratio needed.
> >      graphLayout[i]->addLayout(passFailLayout[i]);
> >    }
> >
> >    // Plonk all graph layouts into one horizontal layout.
> >    QHBoxLayout *firstRowLayout = new QHBoxLayout;
> >    for(i = 0; i<  6; i++)
> >    {
> >      firstRowLayout->addLayout(graphLayout[i]);
> >    }
> >    // Layout the checkbox row to follow.
> >    QHBoxLayout *secondRowLayout = new QHBoxLayout;
> >    for(i = 0; i<  6; i++)
> >    {
> >      secondRowLayout->addWidget(m_graphCheckBoxs[i]);
> >    }
> >    // Layout the tolerance row.
> >    QHBoxLayout *thirdRowLayout = new QHBoxLayout;
> >    thirdRowLayout->addWidget(m_toleranceSlider);
> >    thirdRowLayout->addWidget(m_toleranceLineEdit);
> >    thirdRowLayout->addWidget(m_toleranceCheckBox);
> >    thirdRowLayout->addWidget(m_saveToleranceButton);
> >    thirdRowLayout->addWidget(m_cancelToleranceButton);
> >
> >    // Layout the auto/manual and single-shot buttons.
> >    QHBoxLayout *fourthRowLayout = new QHBoxLayout;
> >    fourthRowLayout->addStretch();
> >    fourthRowLayout->addWidget(m_autoManualComboBox);
> >    fourthRowLayout->addWidget(m_singleShotButton);
> >    fourthRowLayout->addWidget(m_continuousButton);
> >
> >    // Do Top layout.
> >    QVBoxLayout *topLayout = new QVBoxLayout;
> >    topLayout->addLayout(firstRowLayout);
> >    topLayout->addLayout(secondRowLayout);
> >    topLayout->addLayout(thirdRowLayout);
> >    topLayout->addLayout(fourthRowLayout);
> >
> >    QWidget *dummy = new QWidget();
> >    dummy->setLayout(topLayout);
> >    setCentralWidget(dummy);
> > }
> >
> >
> >
> >
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> > Qt-interest at trolltech.com
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> >
> >
> >
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