lvgl-rs/examples/arc.rs

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Rust
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use cstr_core::CString;
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use embedded_graphics::pixelcolor::Rgb565;
use embedded_graphics::prelude::*;
use embedded_graphics_simulator::{
OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
};
use lvgl::style::Style;
use lvgl::widgets::{Arc, Label, LabelAlign};
use lvgl::{self, Align, Color, Part, State, UI};
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use lvgl::{LvError, Widget};
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use lvgl_sys;
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use std::time::Instant;
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fn main() -> Result<(), LvError> {
let display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
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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("Arc Example", &output_settings);
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let mut ui = UI::init()?;
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// Implement and register your display:
ui.disp_drv_register(display)?;
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// 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((255, 255, 255)));
screen_style.set_radius(State::DEFAULT, 0);
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screen.add_style(Part::Main, screen_style)?;
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// Create the arc object
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let mut arc = Arc::new(&mut screen)?;
arc.set_size(150, 150)?;
arc.set_align(&mut screen, Align::Center, 0, 10)?;
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arc.set_start_angle(135)?;
arc.set_end_angle(135)?;
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let mut loading_lbl = Label::new(&mut screen)?;
loading_lbl.set_text(CString::new("Loading...").unwrap().as_c_str())?;
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loading_lbl.set_align(&mut arc, Align::OutTopMid, 0, -10)?;
loading_lbl.set_label_align(LabelAlign::Center)?;
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let mut loading_style = Style::default();
loading_style.set_text_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
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loading_lbl.add_style(Part::Main, loading_style)?;
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let mut angle = 0;
let mut forward = true;
let mut i = 0;
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let mut loop_started = Instant::now();
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'running: loop {
if i > 270 {
forward = if forward { false } else { true };
i = 1;
}
angle = if forward { angle + 1 } else { angle - 1 };
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arc.set_end_angle(angle + 135)?;
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i += 1;
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ui.task_handler();
window.update(ui.get_display_ref().unwrap());
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for event in window.events() {
match event {
SimulatorEvent::Quit => break 'running,
_ => {}
}
}
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ui.tick_inc(loop_started.elapsed());
loop_started = Instant::now();
}
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Ok(())
}