Add move sprite example. (#2414)

## Objective
There is no bevy example that shows how to transform a sprite. At least as its singular purpose. This creates an example of how to use transform.translate to move a sprite up and down. The last pull request had issues that I couldn't fix so I created a new one

### Solution
I created move_sprite example.

Co-authored-by: Carter Anderson <[email protected]>

Cargo.toml

@@ -119,6 +119,10 @@ path = "examples/2d/contributors.rs"
 name = "many_sprites"
 path = "examples/2d/many_sprites.rs"
 
+[[example]]
+name = "move_sprite"
+path = "examples/2d/move_sprite.rs"
+
 [[example]]
 name = "2d_rotation"
 path = "examples/2d/rotation.rs"

examples/2d/move_sprite.rs

@@ -0,0 +1,45 @@
+use bevy::prelude::*;
+
+fn main() {
+ App::build()
+ .add_plugins(DefaultPlugins)
+ .add_startup_system(setup)
+ .add_system(sprite_movement)
+ .run();
+}
+
+enum Direction {
+ Up,
+ Down,
+}
+
+fn setup(
+ mut commands: Commands,
+ asset_server: Res<AssetServer>,
+ mut materials: ResMut<Assets<ColorMaterial>>,
+) {
+ let texture_handle = asset_server.load("branding/icon.png");
+ commands.spawn_bundle(OrthographicCameraBundle::new_2d());
+ commands
+ .spawn_bundle(SpriteBundle {
+ material: materials.add(texture_handle.into()),
+ transform: Transform::from_xyz(100., 0., 0.),
+ ..Default::default()
+ })
+ .insert(Direction::Up);
+}
+
+fn sprite_movement(time: Res<Time>, mut sprite_position: Query<(&mut Direction, &mut Transform)>) {
+ for (mut logo, mut transform) in sprite_position.iter_mut() {
+ match *logo {
+ Direction::Up => transform.translation.y += 150. * time.delta_seconds(),
+ Direction::Down => transform.translation.y -= 150. * time.delta_seconds(),
+ }
+
+ if transform.translation.y > 200. {
+ *logo = Direction::Down;
+ } else if transform.translation.y < -200. {
+ *logo = Direction::Up;
+ }
+ }
+}

examples/README.md

@@ -84,6 +84,7 @@ Example | File | Description
 --- | --- | ---
 `contributors` | [`2d/contributors.rs`](./2d/contributors.rs) | Displays each contributor as a bouncy bevy-ball!
 `many_sprites` | [`2d/many_sprites.rs`](./2d/many_sprites.rs) | Displays many sprites in a grid arragement! Used for performance testing.
+`move_sprite` | [`2d/move_sprite.rs`](./2d/move_sprite.rs) | Changes the transform of a sprite.
 `mesh2d` | [`2d/mesh2d.rs`](./2d/mesh2d.rs) | Renders a 2d mesh
 `mesh2d_manual` | [`2d/mesh2d_manual.rs`](./2d/mesh2d_manual.rs) | Renders a custom mesh "manually" with "mid-level" renderer apis.
 `rect` | [`2d/rect.rs`](./2d/rect.rs) | Renders a rectangle