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8d60e96b2b
Crossterm 0.29 introduced methods to easily check / extract the event type. E.g. as_key_press_event() and is_key_press(). This commit updates the examples to use these methods instead of matching on the event type. This makes the code cleaner and easier to read. Also does a general cleanup of the event handling code in the examples.
94 lines
3.1 KiB
Rust
94 lines
3.1 KiB
Rust
//! # [Ratatui] `Canvas` 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 crossterm::event;
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use ratatui::layout::{Constraint, Layout, Rect};
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use ratatui::style::{Color, Stylize};
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use ratatui::symbols::Marker;
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use ratatui::text::{Line as TextLine, Span};
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use ratatui::widgets::canvas::{Canvas, Line, Map, MapResolution, Rectangle};
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use ratatui::{DefaultTerminal, Frame};
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use ratatui_widgets::canvas::Points;
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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(render)?;
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if event::read()?.is_key_press() {
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return Ok(());
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}
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}
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}
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/// Render the UI with a canvas widget.
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fn render(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::Percentage(100)]).spacing(1);
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let [top, main] = vertical.areas(frame.area());
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let [area] = horizontal.areas(main);
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let title = TextLine::from_iter([
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Span::from("Canvas 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_canvas(frame, area);
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}
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/// Renders the canvas widget with various shapes and a map.
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pub fn render_canvas(frame: &mut Frame, area: Rect) {
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let canvas = Canvas::default()
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.x_bounds([-180.0, 180.0])
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.y_bounds([-90.0, 90.0])
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.marker(Marker::Braille)
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.paint(|ctx| {
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ctx.draw(&Map {
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resolution: MapResolution::High,
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color: Color::White,
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});
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ctx.layer();
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ctx.draw(&Line::new(0.0, 10.0, 10.0, 10.0, Color::Blue));
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ctx.draw(&Rectangle {
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x: 10.0,
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y: 20.0,
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width: 10.0,
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height: 10.0,
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color: Color::Green,
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});
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ctx.draw(&Points {
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coords: &[
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(2.3522, 48.8566), // Paris
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(-122.3321, 47.6062), // Seattle
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(-79.3837, 43.6511), // Toronto
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(32.8597, 39.9334), // Ankara
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],
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color: Color::Red,
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});
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});
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frame.render_widget(canvas, area);
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}
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