Problem Text Flickers

[ValDY69]

Hello Brian ,
How are you ?

I am doing some test with differents texts and logos on a 128*128 LED panels

I notice that when there are some fixed text or logo (TextAnimations.On() method for exemple ) ,
the text or logo Flickers

I try to change FPS but no change ..

How i can resolve this problem ?

with scolling text i have not noticed any flickers problems , it's strange ..

I don't remenber but with older versions of your lib i have not seen this problem earlier ..

there is no problem on the windows simulator

can you help me please ?

Regards , Valentin

[BNNorman]

The fact it doesn't happen with other text animations suggests it's the coding of the On animation.
Could you try recoding it as below so it only calls self.DrawText() when the animation is initialised and let me know if it fixes it. If so I'll push the changes to github.

I have to confess that although I wrote it I didn't really test it. (Slapped wrist)

class On(TextAnimBase):
    """
   On simply displays the given text message until the duration expires
    """
   def step(self):
        if self.init:
              self.drawText()
       self.refreshCanvas()

[BNNorman]

Darn - the python indents disappeared after I posted.
I have updated the comment.

[ValDY69]

thanks brian for your quick answer !

but unlucky it's not working with this change
it seems that it's a little bit more flickers ...

[BNNorman]

Ok, it is related to the foreground colour - if you set the foreground to a single colour there's no flickering. If you use a palette what happens is the code redraws the text using the next color in the list when the animation resets. The reason the simulator doesn't show this effect is that it can run much faster than the physical panel hence the effect is less noticeable.
I'll have a look at the rendering code to see if I can find out why multicolored palettes do this when they should only change the color when the animation duration is over.

[BNNorman]

Fixed - whoops, forgot to make self.init False

class On(TextAnimBase):
    """
   On simply displays the given text message until the duration expires
    """
   def step(self):
        if self.init:
              self.drawText()
              self.init=False        <--- missing line
       self.refreshCanvas()

Was steady on my panel after the missing line was added. I have pushed it to github

[ValDY69]

i test your new code now and no change ... the problem is still here

[BNNorman]

Very odd, it worked on my panel. Did you edit your copy or download the updated TextAnimations.py? From: ValDY69 [mailto:[email protected]] Sent: 27 April 2018 14:16 To: BNNorman/rpi-rgb-led-matrix-animator Cc: Brian; Comment Subject: Re: [BNNorman/rpi-rgb-led-matrix-animator] Problem Text Flickers (#13) i test your new code now and no change ... the problem is still here — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#13 (comment)> , or mute the thread <https://github.com/notifications/unsubscribe-auth/APHW3Yqa2h-VoY7wvarjbBzzQQBaQcEqks5tsxoAgaJpZM4TmR5E> . <https://github.com/notifications/beacon/APHW3WiO5xuWyY88OmhjpcaWxbcm_tRQks5tsxoAgaJpZM4TmR5E.gif>

[ValDY69]

i edit my copy with your modif in this issue + OFFmultiColored = False

class On(TextAnimBase):
"""
On simply displays the given text message until the duration expires
"""
def step(self):
if self.init:
self.drawText()
self.init=False <--- missing line
self.refreshCanvas()

---

#multiColored=False  # now in the text object
OFFmultiColored = False  # depracated, now in the text object

[ValDY69]

i precise that this problem is not really visible for me an a 6464 led panels but much more present on a bigger screen like 128128 !