93 lines
2.9 KiB
Rust
93 lines
2.9 KiB
Rust
use crate::GameState;
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use crate::player::Player;
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use crate::util::single;
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use bevy::{prelude::*, window::PrimaryWindow};
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use bevy_egui::{EguiContexts, EguiPlugin, egui};
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use bevy_rapier3d::prelude::*;
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use bevy_rapier3d::rapier::prelude::CollisionEventFlags;
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use std::iter;
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use super::{Interact, objects};
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pub(super) fn plugin(app: &mut App) {
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app.add_plugins(EguiPlugin)
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.init_resource::<InteractionOpportunity>()
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.add_systems(
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Update,
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(
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update_interaction_opportunities,
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display_interaction_prompt,
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(objects::handle_pick_up, objects::handle_drop, objects::handle_door_interaction),
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)
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.chain()
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.run_if(in_state(GameState::Playing)),
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);
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}
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#[derive(Debug, Clone, Eq, PartialEq, Resource, Default)]
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pub struct InteractionOpportunity(pub Option<Entity>);
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fn update_interaction_opportunities(
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mut collision_events: EventReader<CollisionEvent>,
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player_query: Query<Entity, With<Player>>,
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parents: Query<&Parent>,
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target_query: Query<Entity, (Without<Player>, With<Interact>)>,
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mut interaction_opportunity: ResMut<InteractionOpportunity>,
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) {
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let player = single!(player_query);
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for event in collision_events.read() {
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let (e1, e2, started) = match event {
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CollisionEvent::Started(e1, e2, CollisionEventFlags::SENSOR) => (*e1, *e2, true),
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CollisionEvent::Stopped(e1, e2, CollisionEventFlags::SENSOR) => (*e1, *e2, false),
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_ => {
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continue;
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}
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};
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let sensor = match player {
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p if p == e1 => e2,
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p if p == e2 => e1,
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_ => continue,
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};
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let mut ancestors = iter::once(sensor).chain(parents.iter_ancestors(sensor));
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let Some(interactable) = ancestors.find_map(|entity| target_query.get(entity).ok()) else {
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continue;
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};
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if started {
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interaction_opportunity.0.replace(interactable);
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} else {
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interaction_opportunity.0.take_if(|t| *t == interactable);
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}
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}
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}
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fn display_interaction_prompt(
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interaction_opportunity: Res<InteractionOpportunity>,
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mut egui_contexts: EguiContexts,
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primary_windows: Query<&Window, With<PrimaryWindow>>,
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names: Query<&Name, With<Interact>>, // only the interactables ofcourse
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) {
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let Some(opportunity) = interaction_opportunity.0 else {
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return;
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};
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let window = single!(primary_windows);
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let entity_name = names
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.get(opportunity)
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.map(|name| name.as_str())
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.expect("A named Interactable object");
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// objective or item
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egui::Window::new("Interaction")
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.collapsible(false)
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.title_bar(false)
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.auto_sized()
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.fixed_pos(egui::Pos2::new(window.width() / 2., window.height() / 2.))
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.show(egui_contexts.ctx_mut(), |ui| {
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ui.label(format!("E: Pick Up {entity_name}"));
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});
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}
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