module main

import gg

struct App {
mut:
    gg     &gg.Context = unsafe { nil }
    radius f64 = 10.0
}

fn main() {
    mut app := &App{}
    app.gg = gg.new_context(
        bg_color: gg.white
        width: 300
        height: 300
        window_title: 'Circles'
        frame_fn: frame
        event_fn: on_event
        user_data: app
    )
    app.gg.run()
}

fn on_event(e &gg.Event, mut app App) {
    match e.typ {
        .key_down {
            match e.key_code {
                .up {
                    app.radius += 1
                }
                .down {
                    app.radius -= 1
                }
                else {}
            }
        }
        else {}
    }
}

fn frame(mut app App) {
    app.gg.begin()
    app.gg.draw_circle_empty(150, 150, f32(app.radius), gg.blue)
    app.gg.draw_text(20, 20, 'radius: ${app.radius}')
    //    app.gg.draw_text(20, 50, 'circle_segment_size: ${circle_segment_size}')
    app.gg.end()
}