QwtPlotRenderer and ExternalLegend position

[frankiefrank]

I have a plot that uses a legend positioned initially with QwtPlot::RightLegend and then set to QwtPlot::ExternalLegend.

I want to render the plot to the clipboard but the legend rectangle ends up being painted at position 0,0 and not where I actually see it in my widget.

Here's the rendering code:

QClipboard *clipboard = QApplication::clipboard();
QwtPlotRenderer renderer;
QImage img(this->size(), QImage::Format_ARGB32);
QPainter painter(&img);
renderer.render(this, &painter, this->rect());	
clipboard->setImage(img);

QClipboard *clipboard = QApplication::clipboard();
QwtPlotRenderer renderer;
QImage img(this->size(), QImage::Format_ARGB32);
QPainter painter(&img);
renderer.render(this, &painter, this->rect());	
clipboard->setImage(img);

To copy to clipboard, switch view to plain text mode 

I tried to reposition the legend to QwtPlot::RightLegend but then I naturally get it in the separate right section as you would see it in the widget, which is not what I want.

How can I make the legend rectangle painted in it's actual position?

[Uwe]

QwtPlotRenderer::render() doesn't include an external legend - instead you have to calculate the layout for the legend in your application code ( like you do it with the legend widget ) and call QwtPlotRenderer::renderLegend() manually.

Uwe

[frankiefrank]

Thanks for your reply. In my case the legend was indeed rendered although it was defined as ExternalLegend, is that a bug or did I misunderstand the expected behavior you describe?

I understand I can renderLegend separately but maybe I'm missing QPainter experience, could you please direct me to how I can modify my code to render the legend separately in a position of my choosing? (for example (100,100)) ?

Thanks as always for your attention and reply,
Frankie

[Uwe]

Come on:

QPainter painter(&img);
renderer.render(plot, &painter, ... ); 
renderer.renderLegend( plot, &painter, QRectF( 100, 100, ..., ... ) );

QPainter painter(&img);
renderer.render(plot, &painter, ... ); 
renderer.renderLegend( plot, &painter, QRectF( 100, 100, ..., ... ) );

To copy to clipboard, switch view to plain text mode 

Uwe