Correct way to fetch mouse position

[liripoop]

Since bevy 0.9.0 bevy::window:Window does not implement the Resource trait anymore so this cookbook example does not work anymore. What's the cleanest way to access the mouse position with bevy 0.10.0 and convert it to world space?

[tim-blackbird]

Window is now a component you need to query for.
I've updated the system to 0.10 for you :)

fn my_cursor_system(
    windows: Query<&Window>,
    camera_q: Query<(&Camera, &GlobalTransform), With<MainCamera>>,
) {
    let window = windows.single();
    let (camera, camera_transform) = camera_q.single();

    if let Some(world_position) = window
        .cursor_position()
        .and_then(|cursor| camera.viewport_to_world_2d(camera_transform, cursor))
    {
        eprintln!("World coords: {}/{}", world_position.x, world_position.y);
    }
}

[liripoop]

Tysm thats exactly what i was looking for.

[tcanabrava]

For those (like me) that got stuck here, on bevy 0.15 this is now a Result, and not an Option.
so the code would be like:

  .and_then(|cursor| {
            let err = camera.viewport_to_world_2d(camera_transform, cursor);
            match err {
                Ok(pos) => Some(pos),
                Err(_) => None,
            }
        })

Sorry for the necro bump

[tim-blackbird]

For brevity you can use .ok():

.and_then(|cursor| camera.viewport_to_world_2d(camera_transform, cursor).ok())