[Question] How to resize font

[TornaxO7]

As the title says, I'm wondering how I can resize the font dynamically in neovide. I can use Ctrl + + in order to increase the font size in my terminal. Is that also possible in neovide?

[TornaxO7]

(Sorry, I accidently submitted the issue way to early here, I'll fix that quickly and reopen it)

[feature-not-a-bug]

There's no built-in for changing the size up or down. The simplest option would be to set guifont but that can be less than ideal if you're changing the font frequently. With some vimscript you should be able to create a key binding for it.

https://vim.fandom.com/wiki/Change_font_size_quickly

[MultisampledNight]

In #856 the OP had this snippet for the resize function itself:

let s:guifontsize = 10
let s:guifont = "JetBrainsMono\\ Nerd\\ Font"

function! AdjustFontSize(amount)
  let s:guifontsize = s:guifontsize+a:amount
  exe "set guifont=" .. s:guifont .. ":h" .. s:guifontsize
endfunction

Is that enough for your purposes? You could map that function to <C-+> or <C-minus> I guess.

[TornaxO7]

Hm... apparently my font setting doesn't get loaded if I have this line:

set guifont="Fira\\ Code\\ SemiBold:h13"

it only works if I have it like this:

set guifont=Fira\ Code\ SemiBold:h13

[MultisampledNight]

Fair enough, I referred to the function. My fault for pasting the whole snippet instead.

[TornaxO7]

Fair enough, I referred to the function.

Oh, well since I can't use a string it doesn't look like that I can use this function.

[MultisampledNight]

You can use a string. The \ in there are only for escaping purposes. Your working example will work just fine (if you strip the :h13 part), the variable is only about having the option locally available.

[MultisampledNight]

(offloaded the discussion to Discord, closing)

[TornaxO7]

Alright, I have the following settings:

let s:guifontsize=10
let s:guifont="Fira\\ Code\\ SemiBold"
set guifont=Fira\ Code\ SemiBold:h13

let g:neovide_refresh_rate=60
let g:neovide_transparency=0.8
let g:neovide_no_idle=v:false
let g:neovide_fullscreen=v:false
let g:neovide_cursor_animation_length=0.20
let g:neovide_cursor_trail_length=0.5
let g:neovide_cursor_antialiasing=v:true
let g:neovide_cursor_vfx_mode = "ripple"
let g:neovide_cursor_vfx_opacity=200.0
let g:neovide_cursor_vfx_particle_lifetime=1.2
let g:neovide_cursor_vfx_particle_density=7.0
let g:neovide_cursor_vfx_particle_speed=10.0
let g:neovide_cursor_vfx_particle_phase=1.5
let g:neovide_cursor_vfx_particle_curl=1.0

function! AdjustFontSize(amount)
    let s:guifontsize = s:guifontsize + a:amount
    execute "set guifont=" .. s:guifont .. ":h" .. s:guifontsize
endfunction

nnoremap <C-+> <cmd>call AdjustFontSize(+1)<cr>
nnoremap <C--> <cmd>call AdjustFontSize(-1)<cr>

thanks!

[distek]

Not sure if this was a thing at the time of this issue, but this is how I'm doing it now:

local map = vim.keymap.set

local function neovideScale(amount)
	local temp = vim.g.neovide_scale_factor + amount

	if temp < 0.5 then
		return
	end

	vim.g.neovide_scale_factor = temp
end

map("n", "<C-=>", function()
	neovideScale(0.1)
end)

map("n", "<C-->", function()
	neovideScale(-0.1)
end)

[palsmo]

This solution on my system (Fedora Linux 39) does not refresh the screen, only after another keypress.

[palsmo]

This works flawlessly and is the simplest solution, hope it helps!
( *updates the screen immediately, divide by 0 is handled by neovide and just closes the app )

if vim.g.neovide then
    vim.keymap.set({ "n", "v" }, "<C-+>", ":lua vim.g.neovide_scale_factor = vim.g.neovide_scale_factor + 0.1<CR>")
    vim.keymap.set({ "n", "v" }, "<C-->", ":lua vim.g.neovide_scale_factor = vim.g.neovide_scale_factor - 0.1<CR>")
    vim.keymap.set({ "n", "v" }, "<C-0>", ":lua vim.g.neovide_scale_factor = 1<CR>")
end

[max2000warlord]

This works flawlessly and is the simplest solution, hope it helps!

if vim.g.neovide then
    map.set({ "n", "v" }, "<C-+>", ":lua vim.g.neovide_scale_factor = vim.g.neovide_scale_factor + 0.1<CR>")
    map.set({ "n", "v" }, "<C-->", ":lua vim.g.neovide_scale_factor = vim.g.neovide_scale_factor - 0.1<CR>")
    map.set({ "n" , "v" }, "<C-0>", ":lua vim.g.neovide_scale_factor = 1<CR>")
end

What file is that in?

[fredizzimo]

It shouldn't matter, but if you are unsure then init.lua is fine.

But note that this solution can cause this crash

• Attempt to divide by zero when changing scale factor #2221

The other solution above is fine though, since it does not let the scale go down to 0. And you can change 0.5 to something smaller if you to allow it.

[palsmo]

The error is handled silently, no problem.

[palsmo]

@max2000warlord code was updated a tiny bit, place it in your init.lua file or with require link a different file containing your keybindings 👍

[axelhj]

Thanks for this! Just in case it saves someone else 7 seconds on google; I modified warlords example to change the scaling with the scrollwheel just like Nvy or VSCode.

  vim.keymap.set({ "n", "v" }, "<C-ScrollWheelUp>", ":lua vim.g.neovide_scale_factor = vim.g.neovide_scale_factor + 0.1<CR>")
  vim.keymap.set({ "n", "v" }, "<C-ScrollWheelDown>", ":lua vim.g.neovide_scale_factor = vim.g.neovide_scale_factor - 0.1<CR>")