QwtPlotLegend only uses one column

[orignihn]

I'm not sure how to use insertLegend to fix the problem.

In the constructor for my child of QwtPlot, I added

insertLegend(new QwtLegend(canvas()), QwtPlot::TopLegend);
plotLayout()->setLegendPosition(QwtPlot::TopLegend);

insertLegend(new QwtLegend(canvas()), QwtPlot::TopLegend);
plotLayout()->setLegendPosition(QwtPlot::TopLegend);

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but that didn't change anything. I tried adding widgets directly to the legend:

QwtPlotCurve* curve = new QwtPlotCurve(var->get_name());
plotLayout()->setLegendPosition(QwtPlot::TopLegend);
legend()->insert(curve, new QLabel("hello", legend()));
curve->attach(this);

QwtPlotCurve* curve = new QwtPlotCurve(var->get_name());
plotLayout()->setLegendPosition(QwtPlot::TopLegend);
legend()->insert(curve, new QLabel("hello", legend()));
curve->attach(this);

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but the QLabels are still stacking up on top of each other, without using different columns.

Note: Despite setting the QwtLegend to the top position in the constructor, if I don't use setLegendPosition each time I add a curve, the legend appears on the right side of the plot.

I've tried playing with different ratio parameters, but those did not do anything.

What am I missing?

Thanks,
Tom