CODEWITHSUNDEEP
rustbevy
chiffre
chiffre

Reputation: 37

How to move camera arbitrary of user input in Bevy

I've used Camera2dBundle to import sprites and backgrounds into the scene I'm setting up. But I'm not sure how to move the camera independently of the sprite movements. Basically I don't want the camera to follow the player. I want it to constantly move in a single direction regardless of user input. I've tried:

fn move_camera(mut camera: Query<&mut Transform, With<Camera>>)   {
  
     for mut transform in camera.iter_mut() {
        
            transform.translation.x += 5.0; 
     }

However this moves the player's x position

I see transform is made of these items:

Transform { translation: Vec3(0.0, 0.0, 999.9), rotation: Quat(0.0, 0.0, 0.0, 1.0), scale: Vec3(1.0, 1.0, 1.0) }

Here's how I'm accepting user input:

if keyboard_input.pressed(KeyCode::Right) {
            transform.translation.x += 2.0 * 5.0;
            transform.rotation = Quat::from_rotation_y(0.0).into();
            *atlas = player.run.clone();

Is there a better way to do this? Can I add an item to transform? Or what modification can I make?

Upvotes: 3

Views: 5995

Answers (2)

lucidbrot
lucidbrot

Reputation: 6146

I can't tell from your question what went wrong on your side, but here is how I just set up a camera that moves independently in the x axis and follows the player in the y axis:

use crate::{CameraMarker, PlayerMarker};
use bevy::prelude::*;

pub fn camera_movement_system(
    player_query: Query<&Transform, With<PlayerMarker>>,
    // The `Without` is necessary so bevy knows the player and camera are not the same component.
    mut camera_query: Query<&mut Transform, (With<CameraMarker>, Without<PlayerMarker>)>,
) {
    // I have only one camera
    let mut camera_transform = camera_query.single_mut();
    // I have only one player
    let player_transform = player_query.single();

    // x-Axis: always move to the right
    camera_transform.translation.x += 5.0;
    // Set the y-Axis camera position to the player position
    camera_transform.translation.y = player_transform.translation.y;

}

This snippet expects that you have everything set up already. If you are not using Marker Components, it should also work with Camera instead of CameraMarker.

Upvotes: 0

chiffre
chiffre

Reputation: 37

Solved it. Not really the answer I wanted, but simply adding a movement for the player in the opposite directions works.

// added
transform.translation.x -= -1.0 * 5.0;
//
if keyboard_input.pressed(KeyCode::Right)
    transform.translation.x += 2.0 * 5.0;
    transform.rotation =   
    Quat::from_rotation_y(0.0).into();
        *atlas = player.run.clone();

Upvotes: -1

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