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92 lines
3.1 KiB
Rust
92 lines
3.1 KiB
Rust
//! # [Ratatui] `BarChart` example
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//!
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//! The latest version of this example is available in the [widget examples] folder in the
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//! repository.
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//!
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//! Please note that the examples are designed to be run against the `main` branch of the Github
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//! repository. This means that you may not be able to compile with the latest release version on
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//! crates.io, or the one that you have installed locally.
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//!
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//! See the [examples readme] for more information on finding examples that match the version of the
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//! library you are using.
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//!
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//! [Ratatui]: https://github.com/ratatui/ratatui
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//! [widget examples]: https://github.com/ratatui/ratatui/blob/main/ratatui-widgets/examples
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//! [examples readme]: https://github.com/ratatui/ratatui/blob/main/examples/README.md
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use color_eyre::Result;
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use ratatui::{
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layout::{Constraint, Layout, Rect},
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style::Stylize,
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text::{Line, Span},
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widgets::{Bar, BarChart},
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DefaultTerminal, Frame,
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};
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fn main() -> Result<()> {
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color_eyre::install()?;
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let terminal = ratatui::init();
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let result = run(terminal);
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ratatui::restore();
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result
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}
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/// Run the application.
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fn run(mut terminal: DefaultTerminal) -> Result<()> {
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loop {
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terminal.draw(draw)?;
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if quit_key_pressed()? {
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break Ok(());
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}
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}
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}
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/// Draw the UI with a title and two barcharts.
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fn draw(frame: &mut Frame) {
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let vertical = Layout::vertical([Constraint::Length(1), Constraint::Fill(1)]).spacing(1);
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let horizontal = Layout::horizontal([Constraint::Length(28), Constraint::Fill(1)]).spacing(1);
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let [top, main] = vertical.areas(frame.area());
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let [left, right] = horizontal.areas(main);
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let title = Line::from_iter([
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Span::from("BarChart Widget").bold(),
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Span::from(" (Press 'q' to quit)"),
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]);
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frame.render_widget(title.centered(), top);
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render_vertical_barchart(frame, left);
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render_horizontal_barchart(frame, right);
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}
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/// Render a horizontal barchart with some sample data.
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fn render_horizontal_barchart(frame: &mut Frame, area: Rect) {
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let bars = vec![
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Bar::with_label("Red", 30).red(),
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Bar::with_label("Blue", 20).blue(),
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Bar::with_label("Green", 15).green(),
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Bar::with_label("Yellow", 10).yellow(),
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];
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let chart = BarChart::horizontal(bars).bar_width(3);
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frame.render_widget(chart, area);
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}
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/// Render a vertical barchart with some sample data.
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fn render_vertical_barchart(frame: &mut Frame, area: Rect) {
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let bars = vec![
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Bar::with_label("Red", 30).red(),
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Bar::with_label("Blue", 20).blue(),
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Bar::with_label("Green", 15).green(),
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Bar::with_label("Yellow", 10).yellow(),
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];
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let chart = BarChart::vertical(bars).bar_width(6);
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frame.render_widget(chart, area);
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}
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/// Wait for an event and return `true` if the Esc or 'q' key is pressed.
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fn quit_key_pressed() -> Result<bool> {
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use ratatui::crossterm::event::{self, Event, KeyCode};
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match event::read()? {
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Event::Key(event) if matches!(event.code, KeyCode::Esc | KeyCode::Char('q')) => Ok(true),
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_ => Ok(false),
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}
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}
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