I have never seen anything like this brought up before in previous threads so im not really sure where to start. So on my QwtPlot, I want to draw a rectangle along the very bottom of the plot below zero on the y-axis and it has to extend to the length of the x-axis. I've been messing around with the qwt painter class and the draw rect function but haven't had any luck getting a rectangle drawn on the plot anywhere.
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