p5/ Skia in Pycharm rendering just a black screen

[KnightRider3508]

New to Github, p5, sorry if I missed something

Describe the bug
trying to use skia as the renderer however it is not drawing I added background to end of draw to circumvent bug putting it in setup. Works properly in visper but not skia see screenshots for reference.

To Reproduce
from p5 import *

circlex = 200

def setup():
size(400, 300)

def draw():
global circlex
no_stroke()
fill(255)
circle(circlex, 150, 24)
background(0)

run(renderer="skia")

Expected behavior
White circle drawn at 200, 150

Screenshots

System information:

• p5: 0.8.2
• Python version: 3.10.10
• Operating system: W10

Additional context
Add any other context about the problem here.

[github-actions]

Thank you for submitting your first issue to p5py

[tushar5526]

You are calling background(0) at the end, which basically means to set everything to black. Move this to the top in draw()

[KnightRider3508]

Thank you for taking time to help with my issue. I really look forward to this application in python. That is originally how I had it. However that doesn't work If I just try drawing a white BG it doesn't render it. Size of canvas does change if I change size param.

from p5 import *

def setup():
size(400, 300)

def draw():
background(255)

run(renderer="skia")

[KnightRider3508]

Here is a screenshot of my packages I have in my env in case something doesn't look right

[KnightRider3508]

Resolved by using run(renderer='skia') instead of run(renderer="skia")

[smlpt]

@tushar5526 Can you reopen this issue? Because I've just run into the same problem of getting a black screen with skia.

example code:

from p5 import *

def setup():
    size(640, 640)
    no_stroke()

def draw():
    background(128)
    fill(255)
    circle((width/2, height/2), 256)


run(renderer='skia')

P5 runs in a virtual environment with all the packages installed that come with the P5 library.

Vispy:

Skia:

(The size disparity in window sizes seems to be a scaling issue from Windows; I dragged the P5 window onto my second monitor to take the screenshot.)

Is there something obvious I'm missing or is this maybe a bug in P5 related to skia?

[tushar5526]

Hey, this is fixed by #420. Try installing git from github directly, a new release is not made yet.

[smlpt]

Hey, this is fixed by #420. Try installing git from github directly, a new release is not made yet.

Thanks for the quick answer. I tried pip install git+https://github.com/p5py/p5.git#egg=p5 but nothing changed. Is there a specific branch that I should install?

[tushar5526]

Possibly related to #425 Can you try removing size() function from the setup and try again?

[smlpt]

Yes, this seems to work indeed. Interesting bug.

[tushar5526]

Yes, this seems to work indeed. Interesting bug.

#399 is the cause majorly

[paul-morenkov]

Possibly related to #425 Can you try removing size() function from the setup and try again?

So is it not possible to have a different size canvas with the skia renderer currently?

[tushar5526]

Possibly related to #425 Can you try removing size() function from the setup and try again?

So is it not possible to have a different size canvas with the skia renderer currently?

It is possible - You can set the size in draw() when frame_rate == 1. I have not got the chance to work on the fix yet.

[tushar5526]

Hey folks, I finally sat down to put out a fix for this. It should be solved now by #446. The weird behaviour is majorly due to the swapping of buffers. Tested it on my local and seems to be working fine.

Closing the issue now :)

[smlpt]

Can confirm that it works on my side 👍
Thanks a lot for your effort!