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Refactor 2d_viewport_to_world example with let chains

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This commit is contained in:
Tim Blackbird 2025-07-11 20:51:27 +02:00
parent 20dfae9a2d
commit 31ef22aa0a
1 changed files with 16 additions and 33 deletions
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49
examples/2d/2d_viewport_to_world.rs
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@ -21,49 +21,32 @@ fn main() {
fn draw_cursor(
camera_query: Single<(&Camera, &GlobalTransform)>,
window: Query<&Window>,
window: Single<&Window>,
mut gizmos: Gizmos,
) {
let (camera, camera_transform) = *camera_query;
let Ok(window) = window.single() else {
return;
};
let Some(cursor_position) = window.cursor_position() else {
return;
};
// Calculate a world position based on the cursor's position.
let Ok(world_pos) = camera.viewport_to_world_2d(camera_transform, cursor_position) else {
return;
};
// To test Camera::world_to_viewport, convert result back to viewport space and then back to world space.
let Ok(viewport_check) = camera.world_to_viewport(camera_transform, world_pos.extend(0.0))
else {
return;
};
let Ok(world_check) = camera.viewport_to_world_2d(camera_transform, viewport_check.xy()) else {
return;
};
gizmos.circle_2d(world_pos, 10., WHITE);
// Should be the same as world_pos
gizmos.circle_2d(world_check, 8., RED);
if let Some(cursor_position) = window.cursor_position()
// Calculate a world position based on the cursor's position.
&& let Ok(world_pos) = camera.viewport_to_world_2d(camera_transform, cursor_position)
// To test Camera::world_to_viewport, convert result back to viewport space and then back to world space.
&& let Ok(viewport_check) = camera.world_to_viewport(camera_transform, world_pos.extend(0.0))
&& let Ok(world_check) = camera.viewport_to_world_2d(camera_transform, viewport_check.xy())
{
gizmos.circle_2d(world_pos, 10., WHITE);
// Should be the same as world_pos
gizmos.circle_2d(world_check, 8., RED);
}
}
fn controls(
mut camera_query: Query<(&mut Camera, &mut Transform, &mut Projection)>,
window: Query<&Window>,
camera_query: Single<(&mut Camera, &mut Transform, &mut Projection)>,
window: Single<&Window>,
input: Res<ButtonInput<KeyCode>>,
time: Res<Time<Fixed>>,
) {
let Ok(window) = window.single() else {
return;
};
let Ok((mut camera, mut transform, mut projection)) = camera_query.single_mut() else {
return;
};
let (mut camera, mut transform, mut projection) = camera_query.into_inner();
let fspeed = 600.0 * time.delta_secs();
let uspeed = fspeed as u32;
let window_size = window.resolution.physical_size();