Unexpected black image background in OSWeb (using canvas)

Comments

• DahmSF

  November 2021

  Hi Dirk,

  have you checked the background setting in the main script of your experiment?

  The standard is background black. If you have not changed that manually, it's an easy fix.

  Stephan
• jeboydirk

  November 2021

  Hi Stephan,

  Thanks for the suggestion, but that was the first thing that I checked. So unfortunately this easy fix isn't the solution.

  Dirk
• DahmSF

  November 2021

  Hi Dirk,

  have you tried setting the background_color when defining the canvas?

  I remember that i did this issue once in python. In python you can define the font_color and background_color for each canvas differently. Maybe this works similarly in javascript? As a workaround it's worth a try.

  Stephan
• eduard

  November 2021

  Hi,

  Seems to be a bug, or at least something that isn't implemented yet. I don't see how the background color of an inline_canvas can be modified for browser usage. Sketchpads work, though.

  Are you aware of that @sebastiaan?

  Eduard

  
• sebastiaan

  November 2021

  Thanks for pointing this out! I wasn't aware of this, but it's indeed a bug. I filed an issue here, and it should be fixed in the next maintenance release.

  
  
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• jeboydirk

  January 2022

  Great! Thank you
• Wouter

  January 2022

  Hiya! Had the same problem. Just to check (and add a solution for whoever also lands here) the best interim solution I could come up with was to just draw a big rectangle upon creating the canv

  persistent.c=Canvas()
  let c =persistent.c
  c.rect({x:-vars.width/2,y:-vars.height/2,w:1024,h:768,fill:true,color:vars.background})
  

  Is there something more clever (faster?) I could have done?