QwtPlot resize

[moijhd]

So far, I subclassed QwtPlot, I rewrote the sizeHint() method and I specified size policy :

// Overload sizeHint
QSize PlotDistanceReccurence::sizeHint()
{
return QSize(-1, -1);
}

// In constructor...
setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Maximum);

which allowed to reduce a little further the size of the QwtPlot but I still see a limit. Where can it comes from ?

[Seamus]

Try one of these:

void QWidget::setMinimumSize(const QSize &);
void QWidget::setMinimumSize(int minw, int minh);

void QWidget::setMinimumSize(const QSize &);
void QWidget::setMinimumSize(int minw, int minh);

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[moijhd]

setMinimumSize(0, 0); does not change anything to my issue.

My main concern is that I don't have control on how small (or not small here) can a plot be.

[Seamus]

What did you call setMinimumSize() on or from, the plot?

Is your plot in a QLayout?

[Uwe]

My main concern is that I don't have control on how small (or not small here) can a plot be.

First of all you should have a look at QWidget::sizePolicy() and QWidget::sizeHint(), QWidget::minimumSizeHint() to understand the very basics about how Qt layouts work.

Concerning layouts there is nothing special about QwtPlot beside that it implements size hints depending on the place that is needed for the tick labels. You can set a size policy that ignores the size hint or overload and return a different size hint if your applications knows something better.

Uwe

[moijhd]

@Seamus

I have a QWidget. I set a QGridLayout on it. Then I add the QwtPlot in the QGridLayout. And I set on the QwtPlot a size policy and overloaded the sizeHint method (cf previous posts). And I also set setMinimumSize() on the plot.

If I understood where you are going, I should set those parameters to the container of my QwtPlot which should force the size of the plot ?

@uwe

I worked with all those functions. I might be still missing something. Though I don't know what so far. I think you are also pointing out the fact that I should set the parameters to the container ? Regarding the tick labels, I effectively noticed that some "int niceDist = 40" exists on the QwtPlot methods.

I suppose that a QwtPlot or a QToolButton should work similarly but so far it does not (if I don't modify any parameter). It also seems that the behavior of QwtPlot is different on Linux and Window (I am currently working on Window but I had it tested on Linux).

[Uwe]

I worked with all those functions. I might be still missing something. Though I don't know what so far. I think you are also pointing out the fact that I should set the parameters to the container ?

No I wanted to say, that the answer to all of your questions means understanding the Qt layout system.

Uwe