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UI texture slice texture flipping reimplementation (bevyengine#15034)
# Objective Fixes bevyengine#15032 ## Solution Reimplement support for the `flip_x` and `flip_y` fields. This doesn't flip the border geometry, I'm not really sure whether that is desirable or not. Also fixes a bug that was causing the side and center slices to tile incorrectly. ### Testing ``` cargo run --example ui_texture_slice_flip_and_tile ``` ## Showcase <img width="787" alt="nearest" src="https://github.com/user-attachments/assets/bc044bae-1748-42ba-92b5-0500c87264f6"> With tiling need to use nearest filtering to avoid bleeding between the slices. --------- Co-authored-by: Jan Hohenheim <jan@hohenheim.ch> Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| //! This example illustrates how to how to flip and tile images with 9-slicing in the UI. | ||
| use bevy::{prelude::*, winit::WinitSettings}; | ||
| use bevy_render::texture::{ImageLoaderSettings, ImageSampler}; | ||
|
|
||
| fn main() { | ||
| App::new() | ||
| .add_plugins(DefaultPlugins) | ||
| .insert_resource(UiScale(2.)) | ||
| // Only run the app when there is user input. This will significantly reduce CPU/GPU use for UI-only apps. | ||
| .insert_resource(WinitSettings::desktop_app()) | ||
| .add_systems(Startup, setup) | ||
| .run(); | ||
| } | ||
|
|
||
| fn setup(mut commands: Commands, asset_server: Res<AssetServer>) { | ||
| let image = asset_server.load_with_settings( | ||
| "textures/fantasy_ui_borders/numbered_slices.png", | ||
| |settings: &mut ImageLoaderSettings| { | ||
| // Need to use nearest filtering to avoid bleeding between the slices with tiling | ||
| settings.sampler = ImageSampler::nearest(); | ||
| }, | ||
| ); | ||
|
|
||
| let slicer = TextureSlicer { | ||
| // `numbered_slices.png` is 48 pixels square. `BorderRect::square(16.)` insets the slicing line from each edge by 16 pixels, resulting in nine slices that are each 16 pixels square. | ||
| border: BorderRect::square(16.), | ||
| // With `SliceScaleMode::Tile` the side and center slices are tiled to to fill the side and center sections of the target. | ||
| // And with a `stretch_value` of `1.` the tiles will have the same size as the corresponding slices in the source image. | ||
| center_scale_mode: SliceScaleMode::Tile { stretch_value: 1. }, | ||
| sides_scale_mode: SliceScaleMode::Tile { stretch_value: 1. }, | ||
| ..default() | ||
| }; | ||
|
|
||
| // ui camera | ||
| commands.spawn(Camera2dBundle::default()); | ||
|
|
||
| commands | ||
| .spawn(NodeBundle { | ||
| style: Style { | ||
| width: Val::Percent(100.), | ||
| height: Val::Percent(100.), | ||
| justify_content: JustifyContent::Center, | ||
| align_content: AlignContent::Center, | ||
| flex_wrap: FlexWrap::Wrap, | ||
| column_gap: Val::Px(10.), | ||
| row_gap: Val::Px(10.), | ||
| ..default() | ||
| }, | ||
| ..default() | ||
| }) | ||
| .with_children(|parent| { | ||
| for ([width, height], flip_x, flip_y) in [ | ||
| ([160., 160.], false, false), | ||
| ([320., 160.], false, true), | ||
| ([320., 160.], true, false), | ||
| ([160., 160.], true, true), | ||
| ] { | ||
| parent.spawn(( | ||
| NodeBundle { | ||
| style: Style { | ||
| width: Val::Px(width), | ||
| height: Val::Px(height), | ||
| ..default() | ||
| }, | ||
| ..Default::default() | ||
| }, | ||
| UiImage { | ||
| texture: image.clone(), | ||
| flip_x, | ||
| flip_y, | ||
| ..Default::default() | ||
| }, | ||
| ImageScaleMode::Sliced(slicer.clone()), | ||
| )); | ||
| } | ||
| }); | ||
| } |