Changing application size

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Twardowsky29
Posts: 18
Joined: Fri Aug 08, 2025 2:46 pm

Changing application size

Post by Twardowsky29 »

So I'm not good at programming so there's a lot more questions to come but firstly I need to know how can I change the width of the displayed stuff. My screen is 800x480px but there are 3mm borders per side covering it so I just wanted to make the application window and android auto smaller. Also it looks a little bit to stretched (the circles aren't perfectly round). Thanks for any help.
hudiy
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Posts: 440
Joined: Mon Jul 14, 2025 7:42 pm

Re: Changing application size

Post by hudiy »

Hello,
The size of all elements can be adjusted in main_configuration.json.
Please have a look at the following link for more details: https://github.com/wiboma/hudiy/blob/ma ... uration.md

Application
To change the size of the entire window, you can use the windowWidth and windowHeight parameters.
Setting values for these will switch the display mode from fullscreen to a fixed window size.
Additionally, you can keep the window in fullscreen mode while controlling the size of the Hudiy interface using the width and height parameters, and positioning it on the screen with the x and y parameters.

https://github.com/wiboma/hudiy/blob/ma ... pplication

Android Auto
To change the size of the area where Android Auto is displayed, you can use the width and height parameters in the Android Auto section. https://github.com/wiboma/hudiy/blob/ma ... ndroidauto

Similarly, to adjust its position, you can use the x and y parameters.
Changing the size may also require setting appropriate margins (widthMargin, heightMargin).

viewtopic.php?t=7

Overscan
It’s also possible to set screen margins directly in the Raspberry Pi OS kernel using the /boot/firmware/cmdline.txt file, with parameters like margin_left, margin_right, margin_top, and margin_bottom.
This is the equivalent of the old method of using overscan settings.
These parameters are applied system-wide, affecting entire OS - not just Hudiy.

Example:

Code: Select all

video=HDMI-A-1:margin_left=40,margin_right=40,margin_top=32,margin_bottom=32
Let us know the exact dimensions you'd like to set, and we’ll try to help.
Twardowsky29
Posts: 18
Joined: Fri Aug 08, 2025 2:46 pm

Re: Changing application size

Post by Twardowsky29 »

I need to make it smaller by about 20px on left and right. Tried changing the cmdline.txt but it didnt work. Again, Im not that good with computers :)
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hudiy
Site Admin
Posts: 440
Joined: Mon Jul 14, 2025 7:42 pm

Re: Changing application size

Post by hudiy »

From the screenshot, it looks like you’re modifying config.txt and using deprecated overscan parameters.

https://www.raspberrypi.com/documentati ... cy-options

The new way to set margins is through /boot/firmware/cmdline.txt.
Please note that all parameters in this file must be on a single line.

To determine the name of your video output, run the command wlr-randr and paste the output here.
We’ll then help you create the appropriate parameters for cmdline.txt, which you can copy and paste into the file /boot/firmware/cmdline.txt.
Twardowsky29
Posts: 18
Joined: Fri Aug 08, 2025 2:46 pm

Re: Changing application size

Post by Twardowsky29 »

Damn, that was embarrassing mistake. I think it works now and looks perfect ;) More questions to come :>
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