Maintaining square widget (plot)

[jmsbc]

Hi,

Is there a way to maintain QwtPlot's physical aspect ratio in a layout? Uwe, you suggested QwtPlotRescaler before, but now I need QwtPlot to look like a square widget instead of rectangle when the window stretches. Here's what I tried to do:

TargetDisplay::TargetDisplay(QWidget *parent)
    : QMainWindow(parent)
{
  ui.setupUi(this);
  d_plot = new RandomPlot(this);
 
  QSizePolicy policy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  policy.setHeightForWidth(true);
  d_plot->setSizePolicy(policy);
 
  ui.horizontalLayout->insertWidget(0, d_plot);
}

TargetDisplay::TargetDisplay(QWidget *parent)
    : QMainWindow(parent)
{
  ui.setupUi(this);
  d_plot = new RandomPlot(this);
 
  QSizePolicy policy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  policy.setHeightForWidth(true);
  d_plot->setSizePolicy(policy);
 
  ui.horizontalLayout->insertWidget(0, d_plot);
}

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and then in my RandomPlot widget I have:

class RandomPlot: public IncrementalPlot
{
    Q_OBJECT
 
public:
  RandomPlot(QWidget *parent);
  ~RandomPlot();
 
  int heightForWidth(int w) const {
    return w;
  }
}

class RandomPlot: public IncrementalPlot
{
    Q_OBJECT
 
public:
  RandomPlot(QWidget *parent);
  ~RandomPlot();
 
  int heightForWidth(int w) const {
    return w;
  }
}

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But it's not remaining a square whenever the window stretches. What else do I need to include? Thank you.

-James

[jmsbc]

Nevermind, I figured it out. Instead of adding d_plot directly to the horizontalLayout, I added it to QwtDynGridLayout first, and then added the layout to the horizontalLayout:

gLayout = new QwtDynGridLayout(this);
  gLayout->addWidget(d_plot);
  ui.horizontalLayout->insertLayout(0, gLayout);

gLayout = new QwtDynGridLayout(this);
  gLayout->addWidget(d_plot);
  ui.horizontalLayout->insertLayout(0, gLayout);

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Now I get a square