Created
July 19, 2024 19:29
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A calculator in bevy! (codegolf)
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| use std::ops::Deref; | |
| use bevy::{color::palettes::tailwind::*, prelude::*}; | |
| use calc::*; | |
| use itertools::Itertools; | |
| use rust_decimal::prelude::*; | |
| fn main() { | |
| App::new() | |
| .insert_resource(ClearColor(SLATE_950.into())) | |
| .add_plugins(DefaultPlugins) | |
| .add_systems(Startup, startup) | |
| .add_systems(Update, button_system) | |
| .observe(calculate) | |
| .run(); | |
| } | |
| fn calculate( | |
| trigger: Trigger<PressEvent>, | |
| mut display: Local<String>, | |
| mut text_query: Query<&mut Text, With<Output>>, | |
| ) { | |
| match trigger.event().0.deref() { | |
| "C" => { | |
| *display = "".to_string(); | |
| } | |
| "=" => { | |
| let Ok(result) = Context::<f64>::default() | |
| .evaluate(&display) | |
| else { | |
| *display = "error".to_string(); | |
| return; | |
| }; | |
| if let Some(result) = Decimal::from_f64( | |
| (result * 100.).round() / 100., | |
| ) { | |
| *display = result.normalize().to_string(); | |
| } else { | |
| *display = result.to_string(); | |
| } | |
| } | |
| x => { | |
| display.push_str(x); | |
| } | |
| } | |
| for mut text in &mut text_query { | |
| text.sections[0].value = | |
| display.chars().tail(11).collect::<String>(); | |
| } | |
| } | |
| #[derive(Component)] | |
| struct Output; | |
| fn startup(mut commands: Commands) { | |
| commands.spawn(Camera2dBundle::default()); | |
| let container = commands | |
| .spawn(NodeBundle { | |
| style: Style { | |
| display: Display::Grid, | |
| grid_template_columns: | |
| RepeatedGridTrack::auto(4), | |
| margin: UiRect::all(Val::Auto), | |
| ..default() | |
| }, | |
| ..default() | |
| }) | |
| .id(); | |
| let items = vec![ | |
| "C", "", "7", "8", "9", "/", "4", "5", "6", "*", | |
| "1", "2", "3", "-", "0", ".", "=", "+", | |
| ]; | |
| for item in items { | |
| let button = commands | |
| .spawn(ButtonBundle { | |
| style: Style { | |
| grid_column: GridPlacement::span( | |
| if item == "" { 3 } else { 1 }, | |
| ), | |
| border: UiRect::all(Val::Px(1.)), | |
| padding: UiRect::all(Val::Px(20.)), | |
| margin: UiRect::all(Val::Px(5.)), | |
| ..default() | |
| }, | |
| border_radius: BorderRadius::all( | |
| if item == "" { | |
| Val::Px(0.) | |
| } else { | |
| Val::Px(5.) | |
| }, | |
| ), | |
| border_color: BorderColor(if item == "" { | |
| SKY_950.into() | |
| } else { | |
| SLATE_400.into() | |
| }), | |
| ..default() | |
| }) | |
| .with_children(|builder| { | |
| let mut b = builder.spawn(TextBundle { | |
| text: Text::from_section( | |
| item, | |
| TextStyle::default(), | |
| ), | |
| ..default() | |
| }); | |
| if item == "" { | |
| b.insert(Output); | |
| } | |
| }) | |
| .id(); | |
| commands.entity(container).add_child(button); | |
| } | |
| } | |
| #[derive(Event)] | |
| struct PressEvent(String); | |
| const NORMAL_BUTTON: Srgba = SLATE_500; | |
| const HOVERED_BUTTON: Srgba = SLATE_400; | |
| const PRESSED_BUTTON: Srgba = GREEN_400; | |
| fn button_system( | |
| mut commands: Commands, | |
| mut interaction_query: Query< | |
| ( | |
| &Interaction, | |
| &mut BackgroundColor, | |
| &Children, | |
| ), | |
| (Changed<Interaction>, With<Button>), | |
| >, | |
| text_query: Query<&Text>, | |
| ) { | |
| for (interaction, mut color, children) in | |
| &mut interaction_query | |
| { | |
| let text = text_query.get(children[0]).unwrap(); | |
| match *interaction { | |
| Interaction::Pressed => { | |
| *color = PRESSED_BUTTON.into(); | |
| commands.trigger(PressEvent( | |
| text.sections[0].value.to_string(), | |
| )); | |
| } | |
| Interaction::Hovered => { | |
| *color = HOVERED_BUTTON.into(); | |
| } | |
| Interaction::None => { | |
| *color = NORMAL_BUTTON.into(); | |
| } | |
| } | |
| } | |
| } |
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