Composition of sprites on an entity

[gmoller]

Hi,

Could someone please point me in the right direction for creating an entity with a composition of sprites instead of just one ColorMaterial? I'm wondering if it would be possible to change the composition of the sprites dynamically based on the state of an entity, such as when it is selected or hovered over, etc.

Thanks,
Greg

[payload]

Make each sprite its own entity so each can have their ColorMaterial and so on. But have a root entity holding everything together by making each sprite a child of the parent entity.

Later you can access each child sprite with a query when you know the entity. I sometimes use marker components for each child or like in the example below a component holding the Entity handles to each sprite in the composition.

Example:

let left_arm = commands.spawn_bundle(...).id();
let right_arm = commands.spawn_bundle(...).id();
let head = commands.spawn_bundle(...).id();

// root entity and component holding everything together
// struct Body { left_arm: Entity, right_arm: Entity, head: Entity };
commands.spawn_bundle((Transform::identity(), GlobalTransform::identity(), Body { left_arm, right_arm, head })).push_children(&[left_arm, right_arm, head]);

// later in a system you can access and modify each ColorMaterial for example with
color_material_query.get_mut(body.left_arm)

[gmoller]

Thank you much!

[gmoller]

Although I couldn't get it to compile as:

commands.spawn_bundle((Transform::identity(), GlobalTransform::identity(), Body { left_arm, right_arm, head }).push_children(&[left_arm, right_arm, head]);

It seems to compile with:
commands.spawn_bundle((Transform::identity(), GlobalTransform::identity(), Body { left_arm, right_arm, head })).push_children(&[left_arm, right_arm, head]);

[payload]

yes, missing closing parenthesis. updated comment