From 1f5b16090b5e1eadf0f0e5944a0c8327e5b05603 Mon Sep 17 00:00:00 2001
From: Schrottkatze <git@schrottkatze.de>
Date: Sat, 23 Nov 2024 17:54:12 +0100
Subject: [PATCH] add basic (untested) animation thingythingthing

---
 src/game/player.rs           | 68 ++++++++++++++++++++++++------------
 src/game/player/animation.rs | 43 +++++++++++++++++++++++
 2 files changed, 89 insertions(+), 22 deletions(-)
 create mode 100644 src/game/player/animation.rs

diff --git a/src/game/player.rs b/src/game/player.rs
index 6d11747..b8b6b60 100644
--- a/src/game/player.rs
+++ b/src/game/player.rs
@@ -1,10 +1,15 @@
-use bevy::{prelude::*, sprite::MaterialMesh2dBundle};
+use std::{hash::Hash, time::Duration};
+
+use bevy::{prelude::*, sprite::MaterialMesh2dBundle, utils::HashMap};
 
 use bevy_rapier2d::prelude::*;
 
 use crate::{AppState, METER};
 
 use super::set::IngameSet;
+
+mod animation;
+
 #[derive(Component)]
 struct Player {}
 
@@ -12,32 +17,51 @@ pub(super) fn player_plugin(app: &mut App) {
     app.add_systems(OnEnter(AppState::InGame), add_player.in_set(IngameSet));
 }
 
+#[derive(Hash, PartialEq, Eq, Default)]
+enum PlayerAnimations {
+    #[default]
+    Idle,
+    Walk,
+}
+
 pub fn add_player(
     mut commands: Commands,
     mut meshes: ResMut<Assets<Mesh>>,
     mut materials: ResMut<Assets<ColorMaterial>>,
+    mut texture_atlas_layouts: ResMut<Assets<TextureAtlasLayout>>,
     asset_server: Res<AssetServer>,
 ) {
-    // TODO replace
-    commands.spawn(SpriteBundle {
-        texture: asset_server.load("assets/Blockgrau.png"),
-        ..Default::default()
-    });
+    let tex_idle = asset_server.load("idle.png");
+    let layout_idle = TextureAtlasLayout::from_grid(UVec2::splat(512), 2, 1, None, None);
+    let layout_idle_handle = texture_atlas_layouts.add(layout_idle);
 
-    commands
-        .spawn((
-            Player {},
-            MaterialMesh2dBundle {
-                mesh: meshes.add(Circle::new(20.)).into(),
-                material: materials.add(asset_server.load("test.png")),
-                transform: Transform::from_xyz(10., 10., 0.),
-                ..default()
-            },
-        ))
-        //.insert((
-        //    RigidBody::Dynamic,
-        //    Collider::cuboid(0.4 * METER, 0.9 * METER),
-        //    Velocity::default(),
-        //))
-        .insert(ActiveEvents::COLLISION_EVENTS);
+    let tex_walk = asset_server.load("walk.png");
+    let layout_walk = TextureAtlasLayout::from_grid(UVec2::splat(512), 4, 1, None, None);
+    let layout_walk_handle = texture_atlas_layouts.add(layout_walk);
+
+    let anims = animation::AnimationManager::default()
+        .insert(
+            PlayerAnimations::Idle,
+            animation::Animation::new(
+                TextureAtlas {
+                    layout: layout_idle_handle,
+                    index: 0,
+                },
+                2,
+                4,
+                tex_idle,
+            ),
+        )
+        .insert(
+            PlayerAnimations::Walk,
+            animation::Animation::new(
+                TextureAtlas {
+                    layout: layout_walk_handle,
+                    index: 0,
+                },
+                2,
+                4,
+                tex_walk,
+            ),
+        );
 }
diff --git a/src/game/player/animation.rs b/src/game/player/animation.rs
new file mode 100644
index 0000000..d7357e6
--- /dev/null
+++ b/src/game/player/animation.rs
@@ -0,0 +1,43 @@
+use bevy::prelude::*;
+use std::time::Duration;
+
+use bevy::utils::HashMap;
+
+use std::hash::Hash;
+
+#[derive(Default)]
+pub(crate) struct AnimationManager<Anim: Hash + Eq> {
+    animations: HashMap<Anim, Animation>,
+}
+
+impl<Anim: Hash + Eq> AnimationManager<Anim> {
+    pub fn insert(mut self, which: Anim, anim: Animation) -> Self {
+        self.animations.insert(which, anim);
+        self
+    }
+}
+
+pub(crate) struct Animation {
+    atlas: TextureAtlas,
+    max_index: usize,
+    fps: u8,
+    frame_timer: Timer,
+    tex: Handle<Image>,
+}
+
+impl Animation {
+    pub fn new(atlas: TextureAtlas, length: usize, fps: u8, tex_handle: Handle<Image>) -> Self {
+        Self {
+            atlas,
+            max_index: length - 1,
+            fps,
+            frame_timer: Self::timer_from_fps(fps),
+            tex: tex_handle,
+        }
+    }
+
+    // stolen from https://github.com/bevyengine/bevy/blob/5c759a1be800209f537bea31d32b8ba7e966b0c1/examples/2d/sprite_animation.rs#L53-L55
+    pub(crate) fn timer_from_fps(fps: u8) -> Timer {
+        Timer::new(Duration::from_secs_f32(1.0 / (fps as f32)), TimerMode::Once)
+    }
+}