bevy/examples/picking
ickshonpe 84b09b9398
Newtype Anchor (#18439)
# Objective

The `Anchor` component doesn't need to be a enum. The variants are just
mapped to `Vec2`s so it could be changed to a newtype with associated
const values, saving the space needed for the discriminator by the enum.

Also there was no benefit I think in hiding the underlying `Vec2`
representation of `Anchor`s.

Suggested by @atlv24.

Fixes #18459
Fixes #18460

## Solution

Change `Anchor` to a struct newtyping a `Vec2`, and its variants into
associated constants.

## Migration Guide

The anchor component has been changed from an enum to a struct newtyping
a `Vec2`. The `Custom` variant has been removed, instead to construct a
custom `Anchor` use its tuple constructor:
```rust
Sprite {
     anchor: Anchor(Vec2::new(0.25, 0.4)),
     ..default()
}
```
The other enum variants have been replaced with corresponding constants:
* `Anchor::BottomLeft` to `Anchor::BOTTOM_LEFT`
* `Anchor::Center` to `Anchor::CENTER`
* `Anchor::TopRight` to `Anchor::TOP_RIGHT`
* .. and so on for the remaining variants
2025-03-21 22:27:11 +00:00
..
debug_picking.rs Unified picking cleanup (#18401) 2025-03-18 20:28:03 +00:00
mesh_picking.rs Unify picking backends (#17348) 2025-03-18 19:24:43 +00:00
simple_picking.rs Unified picking cleanup (#18401) 2025-03-18 20:28:03 +00:00
sprite_picking.rs Newtype Anchor (#18439) 2025-03-21 22:27:11 +00:00