77 lines
1.7 KiB
Rust
77 lines
1.7 KiB
Rust
use bevy::{prelude::*, window::PrimaryWindow};
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use bevy_rapier3d::{plugin::ReadRapierContext, prelude::QueryFilter};
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use hex::prelude::*;
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use shared::{
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resources::{TileContact, TileUnderCursor},
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tags::MainCamera,
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};
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use world_generation::{prelude::Map, states::GeneratorState};
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pub struct TileSelectionPlugin;
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impl Plugin for TileSelectionPlugin
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{
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fn build(&self, app: &mut App)
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{
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app.init_resource::<TileUnderCursor>();
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app.add_systems(
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PreUpdate,
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update_tile_under_cursor.run_if(in_state(GeneratorState::Idle)),
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);
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}
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}
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fn update_tile_under_cursor(
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cam_query: Single<(&GlobalTransform, &Camera), With<MainCamera>>,
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window: Single<&Window, With<PrimaryWindow>>,
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rapier: ReadRapierContext,
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map: Res<Map>,
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mut tile_under_cursor: ResMut<TileUnderCursor>,
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)
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{
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let (cam_transform, camera) = cam_query.into_inner();
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let Some(cursor_pos) = window.cursor_position()
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else
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{
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return;
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};
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let Ok(cam_ray) = camera.viewport_to_world(cam_transform, cursor_pos)
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else
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{
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return;
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};
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let ctx = rapier.single().expect("Failed to get rapier read context");
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let collision = ctx.cast_ray(
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cam_ray.origin,
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cam_ray.direction.into(),
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500.,
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true,
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QueryFilter::only_fixed(),
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);
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if let Some((_e, dist)) = collision
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{
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let contact_point = cam_ray.get_point(dist);
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let contact_coord = HexCoord::from_world_pos(contact_point);
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//todo: handle correct tile detection when contacting a tile from the side
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if !map.is_in_bounds(&contact_coord)
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{
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tile_under_cursor.0 = None;
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return;
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}
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let surface = map.sample_height(&contact_coord);
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tile_under_cursor.0 = Some(TileContact::new(
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contact_coord,
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contact_point,
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contact_coord.to_world(surface),
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));
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}
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else
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{
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tile_under_cursor.0 = None;
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}
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}
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