[Interest] QPainter drawLine zValue?

[Israel Brewster]

> On Sep 25, 2019, at 12:26 PM, Jason H <jhihn at gmx.com> wrote:
> 
> 
> 
>> 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?
Now that could work. Thanks!

---
Israel Brewster
Software Engineer
Alaska Volcano Observatory 
Geophysical Institute - UAF 
2156 Koyukuk Drive 
Fairbanks AK 99775-7320
Work: 907-474-5172
cell:  907-328-9145