Help with migration with the Texture Atlas rework on main branch

[miketwenty1]

Wanted to give my question a little more visibility:
135c724#commitcomment-137564820

I'm a bit confused on the migration guide atlas_handle is not defined. Where is this coming from?
Also if I was previously using TextureAtlasSprite to pick a color, I'm guessing I still specify this in sprite, but now through Sprite -> color?

Here is an example of code I'll need to migrate:

pub fn spawn(
    texture: &Handle<TextureAtlas>,
    builder: &mut ChildBuilder,
    color: Color,
) {
    builder.spawn((
        SpriteSheetBundle {
            texture_atlas: texture.clone(),
            sprite: TextureAtlasSprite {
                color,
                index: 1,
                ..Default::default()
            },
            ..Default::default()
        },
    ));
}

The diff in the migration guide shows:

fn my_system(
  mut images: ResMut<Assets<Image>>, 
-  mut atlases: ResMut<Assets<TextureAtlas>>, 
+  mut atlases: ResMut<Assets<TextureAtlasLayout>>, 
  asset_server: Res<AssetServer>
) {
    let texture_handle: asset_server.load("my_texture.png");
-   let layout = TextureAtlas::from_grid(texture_handle, Vec2::new(25.0, 25.0), 5, 5, None, None);
+   let layout = TextureAtlasLayout::from_grid(Vec2::new(25.0, 25.0), 5, 5, None, None);
    let layout_handle = atlases.add(layout);
    commands.spawn(SpriteSheetBundle {
-      sprite: TextureAtlasSprite::new(0),
-      texture_atlas: atlas_handle,
+      atlas: TextureAtlas {
+         layout: layout_handle,
+         index: 0
+      },
+      texture: texture_handle,
       ..Default::default()
     });
}

[ManevilleF]

The new SpriteSheetBundle is now a SpriteBundle with one additional component: TextureAtlas

That component stores both the texture layout handle, and the section index.

In your example you need an extra argument because the TextureLayoutHandle no longer stores the Handle<Image>

pub fn spawn(
+  image: &Handle<Image>,
    texture: &Handle<TextureAtlasLayout>,
    builder: &mut ChildBuilder,
    color: Color,
) {
    builder.spawn((
        SpriteSheetBundle {
            texture_atlas: TextureAtlas {
                layout: texture.clone(),
                index: 1
           },
            sprite: Sprite {
                color,
                ..Default::default()
            },
+            texture: image.clone(),
            ..Default::default()
        },
    ));
}

[miketwenty1]

small correction texture_atlas is atlas