[Haskell-beginners] Problem with Graphics.SOE

[Thomas Hallgren]

Hi,

I did a quick grep in the HGL source code, and it looks like it is trying to use
a font called "9x15", which is one of the traditional X Windows fonts, and they
are not always installed by default on modern Linux systems. You can see which X
fonts are installed by running the xlsfonts command. In Ubuntu / Debian, the
"9x15" font is included in a package called xfonts-base, which is installed by
default however, so my best guess is that you are using another flavour of Linux
where you need to install some additional font package to get that font...

Hope this helps,
Thomas H

On 2021-03-29 12:18, Vitaly Dolgov wrote:
> Hi, everybody!
> 
> I'm trying to do an example from the book "The Haskell
> School of Expression", which originally uses `SOEGraphics`, I use
> `Graphics.SOE` instead, but I get the following error on each run:
> 
> `user error (loadQueryFont)`
> 
> I have no idea how to approach the problem... `:trace` outputs an empty
> exception :( Could you please help me to solve this?
> 
> My environment is: Linux, ghc 8.10.4, HGL 3.2.3.2
> The code is quite basic:
> 
> ```
> import Graphics.SOE
> 
> main
>    = runGraphics $
>      do w <- openWindow "Hello World!" (300, 300)
>         drawInWindow w (text (100, 200) "Hello World!")
>         k <- getKey w
>         closeWindow w
> ```
> 
> Thank you,
> Vitaly
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