help me, I'm stuck with basic Vec2 operation...

[adsick]

I have a

struct PointerPosition(Vec2);

to store the position of the pointer.
and I want it to be up to date so I try to:

fn mouse_move_system(mut mouse_movement: EventReader<MouseMotion>, mut pointer: ResMut<PointerPosition>){
    for mm in  mouse_movement.iter(){
        *pointer.0+=mm.delta;
        println!("pointer position: {:?}", *pointer.0);
    }
}

but the catch is that it does not compile!
the error says:

binary assignment operation `+=` cannot be applied to type `XY<f32>`

what XY<f32> and why it does not support addition? what is even going on here? I tried to dig into some glam source code, but there was like 0 documentation on Vec2 and also whole bunch of scary macros.
how to figure it out? I am expecting other newcomers will encounter the same problem.

[alice-i-cecile]

Just to double check: does

        *pointer.0 = pointer.0 + mm.delta;

compile?

[adsick]

I tried different combinations including what you suggest except I dereferenced the operands. It said "can not add XY<f32> to XY<f32>"

[alice-i-cecile]

That is an even more surprising error message :( If you can't figure this out, I'd recommend filing an issue on the glam repo directly.

[adsick]

I'll do it when I will be less lazy than now.

[adsick]

Finally I figured it out, guy from Rust Gamedev Russia told me that I do extra dereferences so, just throwing out those asterisks fixed everything. Also noticed that Bevy is unable to start the app if there is no audio available (panic message from rodio)