bevy_panorbit_camera 0.5.0

A basic pan and orbit camera in Bevy
Documentation 
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//! Demonstrates usage with multiple windows

use bevy::prelude::*;
use bevy::render::camera::RenderTarget;
use bevy::window::WindowRef;
use bevy_panorbit_camera::{PanOrbitCamera, PanOrbitCameraPlugin};
use std::f32::consts::TAU;

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_plugin(PanOrbitCameraPlugin)
        .add_startup_system(setup)
        .run();
}

fn setup(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    // Ground
    commands.spawn(PbrBundle {
        mesh: meshes.add(shape::Plane::from_size(5.0).into()),
        material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
        ..default()
    });
    // Cube
    commands.spawn(PbrBundle {
        mesh: meshes.add(Mesh::from(shape::Cube { size: 1.0 })),
        material: materials.add(Color::rgb(0.8, 0.7, 0.6).into()),
        transform: Transform::from_xyz(0.0, 0.5, 0.0),
        ..default()
    });
    // Light
    commands.spawn(PointLightBundle {
        point_light: PointLight {
            intensity: 1500.0,
            shadows_enabled: true,
            ..default()
        },
        transform: Transform::from_xyz(4.0, 8.0, 4.0),
        ..default()
    });
    // Camera
    commands.spawn((
        Camera3dBundle {
            transform: Transform::from_translation(Vec3::new(0.0, 1.5, 5.0)),
            ..default()
        },
        PanOrbitCamera::default(),
    ));

    // Spawn a second window
    let second_window = commands
        .spawn(Window {
            title: "Second window".to_owned(),
            ..default()
        })
        .id();

    // second window camera
    commands.spawn((
        Camera3dBundle {
            transform: Transform::from_translation(Vec3::new(5.0, 1.5, 7.0)),
            camera: Camera {
                target: RenderTarget::Window(WindowRef::Entity(second_window)),
                ..default()
            },
            ..default()
        },
        PanOrbitCamera::default(),
    ));
}