bevy/crates/bevy_sprite/src/sprite.rs
Félix Lescaudey de Maneville e0c296ee14
Optional ImageScaleMode (#11780)
> Follow up to #11600 and #10588 

@mockersf expressed some [valid
concerns](https://github.com/bevyengine/bevy/pull/11600#issuecomment-1932796498)
about the current system this PR attempts to fix:

The `ComputedTextureSlices` reacts to asset change in both `bevy_sprite`
and `bevy_ui`, meaning that if the `ImageScaleMode` is inserted by
default in the bundles, we will iterate through most 2d items every time
an asset is updated.

# Solution

- `ImageScaleMode` only has two variants: `Sliced` and `Tiled`. I
removed the `Stretched` default
- `ImageScaleMode` is no longer part of any bundle, but the relevant
bundles explain that this additional component can be inserted

This way, the *absence* of `ImageScaleMode` means the image will be
stretched, and its *presence* will include the entity to the various
slicing systems

Optional components in bundles would make this more straigthfoward

# Additional work

Should I add new bundles with the `ImageScaleMode` component ?
2024-02-09 20:36:32 +00:00

88 lines
3.1 KiB
Rust

use bevy_ecs::{component::Component, reflect::ReflectComponent};
use bevy_math::{Rect, Vec2};
use bevy_reflect::{std_traits::ReflectDefault, Reflect};
use bevy_render::color::Color;
use crate::TextureSlicer;
/// Specifies the rendering properties of a sprite.
///
/// This is commonly used as a component within [`SpriteBundle`](crate::bundle::SpriteBundle).
#[derive(Component, Debug, Default, Clone, Reflect)]
#[reflect(Component, Default)]
#[repr(C)]
pub struct Sprite {
/// The sprite's color tint
pub color: Color,
/// Flip the sprite along the `X` axis
pub flip_x: bool,
/// Flip the sprite along the `Y` axis
pub flip_y: bool,
/// An optional custom size for the sprite that will be used when rendering, instead of the size
/// of the sprite's image
pub custom_size: Option<Vec2>,
/// An optional rectangle representing the region of the sprite's image to render, instead of rendering
/// the full image. This is an easy one-off alternative to using a [`TextureAtlas`](crate::TextureAtlas).
///
/// When used with a [`TextureAtlas`](crate::TextureAtlas), the rect
/// is offset by the atlas's minimal (top-left) corner position.
pub rect: Option<Rect>,
/// [`Anchor`] point of the sprite in the world
pub anchor: Anchor,
}
/// Controls how the image is altered when scaled.
#[derive(Component, Debug, Clone, Reflect)]
#[reflect(Component)]
pub enum ImageScaleMode {
/// The texture will be cut in 9 slices, keeping the texture in proportions on resize
Sliced(TextureSlicer),
/// The texture will be repeated if stretched beyond `stretched_value`
Tiled {
/// Should the image repeat horizontally
tile_x: bool,
/// Should the image repeat vertically
tile_y: bool,
/// The texture will repeat when the ratio between the *drawing dimensions* of texture and the
/// *original texture size* are above this value.
stretch_value: f32,
},
}
/// How a sprite is positioned relative to its [`Transform`](bevy_transform::components::Transform).
/// It defaults to `Anchor::Center`.
#[derive(Component, Debug, Clone, Copy, PartialEq, Default, Reflect)]
#[doc(alias = "pivot")]
pub enum Anchor {
#[default]
Center,
BottomLeft,
BottomCenter,
BottomRight,
CenterLeft,
CenterRight,
TopLeft,
TopCenter,
TopRight,
/// Custom anchor point. Top left is `(-0.5, 0.5)`, center is `(0.0, 0.0)`. The value will
/// be scaled with the sprite size.
Custom(Vec2),
}
impl Anchor {
pub fn as_vec(&self) -> Vec2 {
match self {
Anchor::Center => Vec2::ZERO,
Anchor::BottomLeft => Vec2::new(-0.5, -0.5),
Anchor::BottomCenter => Vec2::new(0.0, -0.5),
Anchor::BottomRight => Vec2::new(0.5, -0.5),
Anchor::CenterLeft => Vec2::new(-0.5, 0.0),
Anchor::CenterRight => Vec2::new(0.5, 0.0),
Anchor::TopLeft => Vec2::new(-0.5, 0.5),
Anchor::TopCenter => Vec2::new(0.0, 0.5),
Anchor::TopRight => Vec2::new(0.5, 0.5),
Anchor::Custom(point) => *point,
}
}
}