lvgl-rs/examples/gauge.rs

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use embedded_graphics::pixelcolor::Rgb565;
use embedded_graphics::prelude::*;
use embedded_graphics_simulator::{
OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
};
use lvgl::style::{Opacity, Style};
use lvgl::widgets::{Gauge, GaugePart};
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use lvgl::{self, Align, Color, DisplayDriver, LvError, Part, State, Widget, UI};
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use lvgl_sys;
use std::sync::{mpsc, Arc, Mutex};
use std::thread::sleep;
use std::time::Duration;
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fn main() -> Result<(), LvError> {
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let mut display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
lvgl_sys::LV_HOR_RES_MAX,
lvgl_sys::LV_VER_RES_MAX,
));
let output_settings = OutputSettingsBuilder::new().scale(2).build();
let mut window = Window::new("Gauge Example", &output_settings);
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let mut ui = UI::init()?;
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// Implement and register your display:
let display_driver = DisplayDriver::new(&mut display);
ui.disp_drv_register(display_driver);
// Create screen and widgets
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let mut screen = ui.scr_act()?;
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let mut screen_style = Style::default();
screen_style.set_bg_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
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screen.add_style(Part::Main, screen_style)?;
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// Create the gauge
let mut gauge_style = Style::default();
// Set a background color and a radius
gauge_style.set_radius(State::DEFAULT, 5);
gauge_style.set_bg_opa(State::DEFAULT, Opacity::OPA_COVER);
gauge_style.set_bg_color(State::DEFAULT, Color::from_rgb((192, 192, 192)));
// Set some paddings
gauge_style.set_pad_inner(State::DEFAULT, 20);
gauge_style.set_pad_top(State::DEFAULT, 20);
gauge_style.set_pad_left(State::DEFAULT, 5);
gauge_style.set_pad_right(State::DEFAULT, 5);
gauge_style.set_scale_end_color(State::DEFAULT, Color::from_rgb((255, 0, 0)));
gauge_style.set_line_color(State::DEFAULT, Color::from_rgb((255, 255, 255)));
gauge_style.set_scale_grad_color(State::DEFAULT, Color::from_rgb((0, 0, 255)));
gauge_style.set_line_width(State::DEFAULT, 2);
gauge_style.set_scale_end_line_width(State::DEFAULT, 4);
gauge_style.set_scale_end_border_width(State::DEFAULT, 4);
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let mut gauge = Gauge::new(&mut screen)?;
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gauge.add_style(Part::Main, gauge_style)?;
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gauge.set_align(&mut screen, Align::Center, 0, 0)?;
gauge.set_value(0, 50)?;
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let threaded_ui = Arc::new(Mutex::new(ui));
let (stop_ch, read_ch) = mpsc::channel();
let closure_ui = threaded_ui.clone();
let tick_thr = std::thread::spawn(move || loop {
let period = Duration::from_millis(5);
// Needs to be called periodically for LittlevGL internal timing calculations.
closure_ui.lock().unwrap().tick_inc(period);
sleep(period);
if read_ch.try_recv().is_ok() {
break;
}
});
let mut i = 0;
'running: loop {
threaded_ui.lock().unwrap().task_handler();
window.update(&display);
for event in window.events() {
match event {
SimulatorEvent::MouseButtonUp {
mouse_btn: _,
point,
} => {
println!("Clicked on: {:?}", point);
}
SimulatorEvent::Quit => break 'running,
_ => {}
}
}
sleep(Duration::from_millis(25));
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gauge.set_value(0, i)?;
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if i > 99 {
i = 0;
} else {
i = i + 1;
}
}
stop_ch.send(true).unwrap();
tick_thr.join().unwrap();
Ok(())
}