98 lines
2.8 KiB
Rust
98 lines
2.8 KiB
Rust
use bevy::prelude::*;
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use crate::player::Player;
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pub struct LightBall;
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pub fn light_up_ball_when_close_to_player(
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mut commands: Commands,
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player: Query<(&Transform, &Player), Without<LightBall>>,
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mut thingies: Query<(
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Entity,
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&Transform,
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&LightBall,
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&mut Handle<StandardMaterial>,
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Option<&mut Light>,
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)>,
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materials: Res<LightBallMaterials>,
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) {
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let player_pos = if let Some(player) = player.iter().next() {
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player.0.translation
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} else {
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return;
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};
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for (entity, trans, _, mut material, light) in thingies.iter_mut() {
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let dis = trans.translation.distance(player_pos);
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if dis < 20.0 {
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*material = materials.lit.clone();
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// change intensity,
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// add light if there isn't one
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if let Some(mut l) = light {
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l.intensity = 300.0 * (20.0 - dis) / 20.0;
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} else {
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commands.entity(entity).insert(Light {
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color: Color::rgb(15.0, 15.0, 15.0),
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intensity: 300.0 * (20.0 - dis) / 20.0,
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..Default::default()
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});
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}
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} else {
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*material = materials.unlit.clone();
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// remove light if there is one
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if light.is_some() {
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commands.entity(entity).remove::<Light>();
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}
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}
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}
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}
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pub fn spawn_light_ball(
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commands: &mut Commands,
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materials: &LightBallMaterials,
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translation: Vec3,
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) {
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commands
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.spawn_bundle(PbrBundle {
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mesh: materials.mesh.clone(),
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material: materials.unlit.clone(),
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transform: Transform::from_translation(translation),
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..Default::default()
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})
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.insert(LightBall);
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}
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pub struct LightBallMaterials {
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unlit: Handle<StandardMaterial>,
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lit: Handle<StandardMaterial>,
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mesh: Handle<Mesh>,
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}
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impl FromWorld for LightBallMaterials {
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fn from_world(world: &mut World) -> Self {
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let world = world.cell();
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let mut materials = world
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.get_resource_mut::<Assets<StandardMaterial>>()
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.unwrap();
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let mut meshes = world.get_resource_mut::<Assets<Mesh>>().unwrap();
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let mut unlit: StandardMaterial = Color::rgb(0.9, 0.9, 0.9).into();
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unlit.metallic = 0.0;
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unlit.reflectance = 0.0;
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let unlit = materials.add(unlit);
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let mut lit: StandardMaterial = Color::rgb(15.0, 15.0, 15.0).into();
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lit.metallic = 0.5;
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lit.reflectance = 0.5;
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lit.emissive = Color::rgb(15.0, 15.0, 15.0);
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let lit = materials.add(lit);
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let mesh = meshes.add(Mesh::from(shape::Icosphere {
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radius: 2.0,
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subdivisions: 5,
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}));
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Self { lit, unlit, mesh }
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}
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}
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