v/vlib/gg/testdata/tweak_circles.vv

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()
}