How to paint the inside of a rectangular ROI

[JJ]

I want to programatically draw a ROI on the plot that has a color fill. However, it should be rendered behind the plotted data.

I would also like to change the line style of the edges.

How can this be done?

[Patrick]

Hi,

You may need to create your own ROI subclass, for example, a copy/paste of one of the existing RectROI, set a brush and use a fillRect instead of drawRect. The pen can be passed in on the ROI constructor to change its style, or tweak it afterwards using the standard QPen methods.

To draw behind plot data, then you can play with calling setZValue(10) on the ROI and/or plot items.

Patrick