Sprite frame cycling

src/main.rs

@@ -36,14 +36,22 @@ fn main() {
 }
 
 fn keyboard_input_system(
-    mut query: Query<&mut TextureAtlasSprite, With<player::Player>>,
+    mut query: Query<(&Handle<TextureAtlas>, &mut TextureAtlasSprite), With<player::Player>>,
     keyboard_input: Res<Input<KeyCode>>,
     mut app_exit_events: ResMut<Events<bevy::app::AppExit>>,
+    texture_atlases: Res<Assets<TextureAtlas>>,
 ) {
     if keyboard_input.pressed(KeyCode::Escape) {
         app_exit_events.send(bevy::app::AppExit);
-    } else if keyboard_input.pressed(KeyCode::N) {
-        let mut sprite = query.single_mut();
-        sprite.index += 1;
+    } else if keyboard_input.just_pressed(KeyCode::N) {
+        let (texture, mut sprite) = query.single_mut();
+        let t = texture_atlases
+            .get(texture)
+            .expect("could not load player texture");
+        if sprite.index < t.textures.len() - 1 {
+            sprite.index += 1;
+        } else {
+            sprite.index = 0;
+        }
     }
 }