keeping a widget to be square

[jmsbc]

Hello,

I have a problem with placing a widget into a horizontalLayout and making it keep an equal aspect ratio (square).

Here is a rough outline of my code:

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

class RandomPlot: public QWidget
{
    Q_OBJECT

public:
  RandomPlot(QWidget *parent);
  ~RandomPlot();

  int heightForWidth(int w) const {
    return w;
  }
}

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but my widget is not maintaining an equal aspect ratio. Can somebody please tell me what I'm doing wrong? Thank you!

-James