tweak ui scale globally & how to set font size

[adsick]

Hi, I want to have access to scale of everything so I can make ui larger and easier to work around.
Tweaking font size is also ambiguous for me now, I just tried to "reverse eng" where values of font sizes lie in the source code by walking from ui.settings_ui() to strange stuff named FontDefinitions.
so the second question is how to tweak font sizes in code?

[emilk]

If you want to scale the entire GUI use the pixels_per_point option (the native example app has a slider for gui scale). For the web version just zoom the web page (like you would any web page).

To change the fonts use set_fonts. In the example for FontDefinitions you can see how the font size for buttons is set: https://docs.rs/egui/0.9.0/egui/struct.FontDefinitions.html

[adsick]

If you want to scale the entire GUI use the pixels_per_point option (the native example app has a slider for gui scale).

I see what are you talking about, but I don't understand how do I access that pixels_per_point thing (in a mutable way of course) all I see for now is my ctx: &CtxRef and it's .pixels_per_point() method which doesn't work out when I want to change the value.

it would be nice to have some kind of .set_scale(...) method on context.

[emilk]

I added Context::set_pixels_per_point in 5f6a468

[buxx]

@emilk Hello, about "For the web version just zoom the web page (like you would any web page)" is it possible to programmatically change the egui pixels_per_point value in web context ? I work on a game playable on mobile device, I want to zoom only egui integration and at the init of the game.

[emilk]

I don't think so at the moment. You could perhaps add a setting to eframe::WebOptions to control if we should follow the web page zoom level or not

[frankvgompel]

Could anyone explain this to me? For instance where do I put Context::set_pixels_per_point() in the "Hello world" example:

https://github.com/emilk/egui/blob/master/examples/hello_world/src/main.rs

And what is the default value of this?

[buxx]

Just put it at line before ui.heading, like this 👍

impl eframe::App for MyApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        egui::CentralPanel::default().show(ctx, |ui| {
            ctx.set_pixels_per_point(5.0);
            ui.heading("My egui Application");
            ui.horizontal(|ui| {
                ui.label("Your name: ");
                ui.text_edit_singleline(&mut self.name);
            });
            ui.add(egui::Slider::new(&mut self.age, 0..=120).text("age"));
            if ui.button("Click each year").clicked() {
                self.age += 1;
            }
            ui.label(format!("Hello '{}', age {}", self.name, self.age));
        });
    }
}

I guess default value is 1.0

[frankvgompel]

Thanks.

[steadmon]

Regarding set_pixels_per_point, is there a way to have it take effect before the first frame is rendered? I call ctx.set_pixels_per_point(1.0) as the very first statement in update, but I still get a single frame rendered with 1.6 PPP, which seems to be coming from integration_info.native_pixels_per_point. I was hoping I could override this by calling set_pixels_per_point in the AppCreator, but it doesn't have any effect.

[buxx]

Sorry, I don't know. I let author or someone else trying to answer this question.

[sstickl]

I know this is old, but for others that are trying to figure out the same problem:

If you call it in your app creation area, it will change the size before the first frame.

Example:

eframe::run_native(
    "App",
    native_options,
    Box::new(|cc: &eframe::CreationContext<'_>| {
        cc.egui_ctx.set_pixels_per_point(1.2);
        Ok(Box::<app::App>::default())
    }),
)

[aurexav]

eframe::run_native(
    "App",
    native_options,
    Box::new(|cc: &eframe::CreationContext<'_>| {
        cc.egui_ctx.set_pixels_per_point(1.2);
        Ok(Box::<app::App>::default())
    }),
)

This won't work. I need to set this property after the app is fully started.

[buxx]

With eframe 0.31.1, I do the following :

impl eframe::App for MyApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        ctx.set_zoom_factor(2.0);
    // [...]