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

---
 .../liz/ecs/animation/AnimationComponents.kt       | 35 +++++++++++++++-------
 .../coffee/liz/ecs/animation/AnimationSystem.kt    | 14 +++++++--
 2 files changed, 35 insertions(+), 14 deletions(-)

(limited to 'composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation')

diff --git a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation/AnimationComponents.kt b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation/AnimationComponents.kt
index cb3708f..5a846fb 100644
--- a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation/AnimationComponents.kt
+++ b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation/AnimationComponents.kt
@@ -10,24 +10,29 @@ import kotlin.jvm.JvmInline
 enum class LoopMode {
     /** Play once **/
     ONCE,
+
     /** Repeat **/
     LOOP,
+
     /** Play forward, then backward, repeat **/
-    PING_PONG
+    PING_PONG,
 }
 
 /**
  * Name of an animation clip.
  */
 @JvmInline
-value class AnimationName(val value: String)
+value class AnimationName(
+    val value: String,
+)
 
 /**
  * Name of a frame.
  */
 @JvmInline
-value class FrameName(val value: String)
-
+value class FrameName(
+    val value: String,
+)
 
 /**
  * Animation Clip details.
@@ -35,7 +40,7 @@ value class FrameName(val value: String)
 data class AnimationClip(
     val frameNames: List<FrameName>,
     val frameTicks: Int,
-    val loopMode: LoopMode = LoopMode.LOOP
+    val loopMode: LoopMode = LoopMode.LOOP,
 )
 
 /**
@@ -43,15 +48,19 @@ data class AnimationClip(
  */
 data class SpriteSheet(
     val imagePath: String,
-    val frames: Map<FrameName, Rect>
+    val frames: Map<FrameName, Rect>,
 ) : Component
 
-enum class AnimationDirection(val step: Int) {
+enum class AnimationDirection(
+    val step: Int,
+) {
     /** Play in forward direction **/
     FORWARD(step = 1),
+
     /** Play in reverse direction **/
-    BACKWARD(step = -1);
+    BACKWARD(step = -1),
 }
+
 /**
  * Current state of an animation.
  */
@@ -61,13 +70,17 @@ data class Animator(
     var frameIndex: Int = 0,
     var elapsedTicks: Int = 0,
     var playing: Boolean = true,
-    var direction: AnimationDirection = AnimationDirection.FORWARD
+    var direction: AnimationDirection = AnimationDirection.FORWARD,
 ) : Component {
     /**
      * Play a specific animation clip by name.
      */
-    fun play(clipName: AnimationName, restart: Boolean = true) {
-        clipName.takeIf { currentClip != it || restart }
+    fun play(
+        clipName: AnimationName,
+        restart: Boolean = true,
+    ) {
+        clipName
+            .takeIf { currentClip != it || restart }
             .run {
                 currentClip = clipName
                 reset()
diff --git a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation/AnimationSystem.kt b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation/AnimationSystem.kt
index 7968250..db64ac6 100644
--- a/composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation/AnimationSystem.kt
+++ b/composeApp/src/commonMain/kotlin/coffee/liz/ecs/animation/AnimationSystem.kt
@@ -7,8 +7,13 @@ import kotlin.time.Duration
 /**
  * Updates animation playback state for all [Animator] components in [World].
  */
-class AnimationSystem(animationTickRate: Duration) : TickedSystem(animationTickRate) {
-    override fun update(world: World, ticks: Int) {
+class AnimationSystem(
+    animationTickRate: Duration,
+) : TickedSystem(animationTickRate) {
+    override fun update(
+        world: World,
+        ticks: Int,
+    ) {
         world.query(Animator::class).forEach { entity ->
             val animator = entity.get(Animator::class)
             if (!animator.playing) return@forEach
@@ -30,7 +35,10 @@ class AnimationSystem(animationTickRate: Duration) : TickedSystem(animationTickR
     /**
      * Advances the animation to the next frame based on loop mode.
      */
-    private fun advanceFrame(animator: Animator, clip: AnimationClip) {
+    private fun advanceFrame(
+        animator: Animator,
+        clip: AnimationClip,
+    ) {
         animator.frameIndex += animator.direction.step
 
         when (clip.loopMode) {
-- 
cgit v1.2.3-70-g09d2