Fix sprite picking viewport (#19747)
# Objective
Fixes sprite picking when using a viewport. Related to #19744.
## Solution
- Do not substract `viewport.min` as `Camera::viewport_to_world` already
does that.
- Skip pointers outside the viewport.
## Testing
Tested with the following example:
<details>
<summary>Click to expand code</summary>
```rust
use bevy::{
prelude::*, render:📷:Viewport, window::SystemCursorIcon, winit::cursor::CursorIcon,
};
fn main() -> AppExit {
App::new()
.add_plugins(DefaultPlugins)
.add_systems(Startup, setup)
.insert_resource(ClearColor(Color::BLACK))
.run()
}
fn setup(mut commands: Commands, window: Single<&Window>) {
commands.spawn((
Camera2d,
Camera {
clear_color: ClearColorConfig::Custom(Color::WHITE),
viewport: Some(Viewport {
physical_position: UVec2::new(
window.physical_width() / 4,
window.physical_height() / 4,
),
physical_size: UVec2::new(
window.physical_width() / 2,
window.physical_height() / 2,
),
..default()
}),
..default()
},
));
commands
.spawn((
Transform::from_xyz(100.0, 100.0, 0.0),
Sprite::from_color(Color::srgb(0.0, 1.0, 0.0), Vec2::new(200.0, 200.0)),
Pickable::default(),
))
.observe(
|trigger: On<Pointer<Drag>>, mut transform: Query<&mut Transform>| {
let mut transform = transform.get_mut(trigger.target()).unwrap();
transform.translation.x += trigger.delta.x;
transform.translation.y -= trigger.delta.y;
},
)
.observe(
|_: On<Pointer<DragStart>>,
window: Single<Entity, With<Window>>,
mut commands: Commands| {
commands
.entity(*window)
.insert(CursorIcon::from(SystemCursorIcon::Grabbing));
},
)
.observe(
|_: On<Pointer<DragEnd>>,
window: Single<Entity, With<Window>>,
mut commands: Commands| {
commands.entity(*window).remove::<CursorIcon>();
},
);
}
```
</details>
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