From a8e5e723b7e1891c9b352261a3ee4c3d3563e8cf Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <me@liz.coffee>
Date: Sun, 26 Oct 2025 21:38:22 -0700
Subject: Checkpoint two

---
 .../kotlin/coffee/liz/ecs/physics/Components.kt    | 25 ++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

(limited to 'composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/Components.kt')

diff --git a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/Components.kt b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/Components.kt
index ffae10b..0b4818d 100644
--- a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/Components.kt
+++ b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/physics/Components.kt
@@ -4,12 +4,29 @@ import coffee.liz.ecs.Component
 import coffee.liz.ecs.Rect
 import coffee.liz.ecs.Vec2
 
-data class Position(val vec2: Vec2): Component
-data class Velocity(val vec2: Vec2) : Component
-data class Acceleration(val vec2: Vec2) : Component
+data class Position(
+    val position: Vec2,
+) : Component
+
+data class Velocity(
+    val velocity: Vec2,
+) : Component
+
+data class Acceleration(
+    val acceleration: Vec2,
+) : Component
+
+interface CollisionGroup<TGroup> {
+    val collisionGroup: TGroup
+    val collideInto: Set<TGroup>
+}
 
 /**
  * @param hitboxes a collection of hitboxes to check collisions against relative to [Rect.topLeft] as the top left of
  * [Position].
  */
-data class Collidable(val hitboxes: Collection<Rect>): Component
+data class Colliding<T : Enum<*>>(
+    val hitboxes: Collection<Rect>,
+    val group: CollisionGroup<T>,
+    val propagateMovement: Boolean = true,
+) : Component
-- 
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