From 28269b4bcda283babfffdbeb88207b588e656254 Mon Sep 17 00:00:00 2001
From: Louis Capitanchik <contact@louiscap.co>
Date: Wed, 5 Jul 2023 14:44:29 +0100
Subject: [PATCH] Add basic collision checking system
---
src/entities/collision.rs | 44 ++++++++++++++++++++++++++++++++++++++-
src/entities/mod.rs | 1 +
2 files changed, 44 insertions(+), 1 deletion(-)
diff --git a/src/entities/collision.rs b/src/entities/collision.rs
index 08a43e7..8064cb9 100644
--- a/src/entities/collision.rs
+++ b/src/entities/collision.rs
@@ -1,5 +1,6 @@
use crate::deref_as;
-use bevy::prelude::{Color, Component, Rect, Vec2};
+use bevy::math::Vec3Swizzles;
+use bevy::prelude::{Changed, Color, Component, Entity, Query, Rect, Transform, Vec2};
#[derive(Clone, Copy, Debug, Component)]
pub struct BoxSize(Vec2);
@@ -37,4 +38,45 @@ impl CollisionGroup {
Enemy => Color::rgb_u8(133, 20, 75),
}
}
+
+ pub fn interacts_with(&self, other: CollisionGroup) -> bool {
+ use CollisionGroup::*;
+
+ matches!(
+ (*self, other),
+ (FriendlyProjectile, Enemy)
+ | (Enemy, FriendlyProjectile)
+ | (Player, Pickup)
+ | (Pickup, Player)
+ | (HostileProjectile, Player)
+ | (Player, HostileProjectile)
+ )
+ }
+}
+
+pub fn check_entity_collisions(
+ moved_colliders: Query<(Entity, &Transform, &BoxSize, &CollisionGroup), Changed<Transform>>,
+ all_colliders: Query<(Entity, &Transform, &BoxSize, &CollisionGroup)>,
+) {
+ for (moved_entity, moved_transform, moved_size, moved_group) in &moved_colliders {
+ for (target_entity, target_transform, target_size, target_group) in &all_colliders {
+ if moved_entity == target_entity {
+ continue;
+ }
+
+ let moved_box = Rect::from_center_size(moved_transform.translation.xy(), **moved_size);
+ let target_box =
+ Rect::from_center_size(target_transform.translation.xy(), **target_size);
+
+ if moved_group.interacts_with(*target_group)
+ && check_box_collisions(moved_box, target_box)
+ {
+ log::info!(
+ "Two colliding entities! {:?} and {:?}",
+ target_entity,
+ moved_entity
+ );
+ }
+ }
+ }
}
diff --git a/src/entities/mod.rs b/src/entities/mod.rs
index 0b8174e..810dfe2 100644
--- a/src/entities/mod.rs
+++ b/src/entities/mod.rs
@@ -19,6 +19,7 @@ mod _plugin {
super::player::process_player_input,
super::motion::apply_velocity,
super::spawning::apply_despawn_boundaries,
+ super::collision::check_entity_collisions,
));
}
}
--
GitLab