[Interest] QPainter drawLine zValue?

Jason H jhihn at gmx.com
Wed Sep 25 22:26:11 CEST 2019

> Sent: Wednesday, September 25, 2019 at 3:06 PM
> From: "Israel Brewster" <ijbrewster at alaska.edu>
> To: "Giuseppe D'Angelo" <giuseppe.dangelo at kdab.com>
> Cc: interest at qt-project.org
> Subject: Re: [Interest] QPainter drawLine zValue?
> On Sep 25, 2019, at 10:55 AM, Giuseppe D'Angelo via Interest <interest at qt-project.org> wrote:
> > 
> > Il 25/09/19 19:13, Israel Brewster ha scritto:
> >> Is there a way to set the Z value of the line drawn by the QPainter::DrawLine() function? I have a library that uses the drawLine function to create a grid, and I would like to keep the grid on the top as I draw other things, if possible. Thanks.
> > 
> > Can you draw the grid _last_?
> > 
> > There's no Z value (or Z buffer altogether) for QPainter. A new drawX command draws directly to the target, honouring the composition mode for blending source and destination together.
> Worth looking into. The drawing is actually being done by a third-party library (PyQtGraph), which makes it harder, but I’ve hacked it before to get it to do what I want, so I may be able to do the same here. I’ll have to dig into how it draws the various components. Thanks!

Use two things (Canvases?) separately then stack them on top of each other with the grid on top?

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