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// NOTE: this is mostly taken from the `iMplode-nZ/bevy-orbit-controls` projects but
// with some modifications like Panning, and 2D support.
// Most of these modifications have been contributed upstream.
use bevy::input::mouse::MouseMotion;
use bevy::input::mouse::MouseScrollUnit::{Line, Pixel};
use bevy::input::mouse::MouseWheel;
use bevy::prelude::*;
use bevy::render::camera::Camera;
use std::ops::RangeInclusive;
const LINE_TO_PIXEL_RATIO: f32 = 0.1;
#[derive(Component)]
pub struct OrbitCamera {
pub x: f32,
pub y: f32,
pub pitch_range: RangeInclusive<f32>,
pub distance: f32,
pub center: Vec3,
pub rotate_sensitivity: f32,
pub pan_sensitivity: f32,
pub zoom_sensitivity: f32,
pub rotate_button: MouseButton,
pub pan_button: MouseButton,
pub enabled: bool,
}
impl Default for OrbitCamera {
fn default() -> Self {
OrbitCamera {
x: 0.0,
y: std::f32::consts::FRAC_PI_2,
pitch_range: 0.01..=3.13,
distance: 5.0,
center: Vec3::ZERO,
rotate_sensitivity: 1.0,
pan_sensitivity: 1.0,
zoom_sensitivity: 0.8,
rotate_button: MouseButton::Left,
pan_button: MouseButton::Right,
enabled: true,
}
}
}
pub struct OrbitCameraPlugin;
impl OrbitCameraPlugin {
#[allow(clippy::type_complexity)]
fn update_transform_system(
mut query: Query<(&OrbitCamera, &mut Transform), (Changed<OrbitCamera>, With<Camera>)>,
) {
for (camera, mut transform) in query.iter_mut() {
let rot = Quat::from_axis_angle(Vec3::Y, camera.x)
* Quat::from_axis_angle(-Vec3::X, camera.y);
transform.translation = (rot * Vec3::Y) * camera.distance + camera.center;
transform.look_at(camera.center, Vec3::Y);
}
}
fn mouse_motion_system(
time: Res<Time>,
mut mouse_motion_events: EventReader<MouseMotion>,
mouse_button_input: Res<ButtonInput<MouseButton>>,
mut query: Query<(&mut OrbitCamera, &mut Transform, &mut Camera)>,
) {
let mut delta = Vec2::ZERO;
for event in mouse_motion_events.read() {
delta += event.delta;
}
for (mut camera, transform, _) in query.iter_mut() {
if !camera.enabled {
continue;
}
if mouse_button_input.pressed(camera.rotate_button) {
camera.x -= delta.x * camera.rotate_sensitivity * time.delta_secs();
camera.y -= delta.y * camera.rotate_sensitivity * time.delta_secs();
camera.y = camera
.y
.max(*camera.pitch_range.start())
.min(*camera.pitch_range.end());
}
if mouse_button_input.pressed(camera.pan_button) {
let right_dir = transform.rotation * -Vec3::X;
let up_dir = transform.rotation * Vec3::Y;
let pan_vector = (delta.x * right_dir + delta.y * up_dir)
* camera.pan_sensitivity
* time.delta_secs();
camera.center += pan_vector;
}
}
}
fn zoom_system(
mut mouse_wheel_events: EventReader<MouseWheel>,
mut query: Query<&mut OrbitCamera, With<Camera>>,
) {
let mut total = 0.0;
for event in mouse_wheel_events.read() {
total += event.y
* match event.unit {
Line => 1.0,
Pixel => LINE_TO_PIXEL_RATIO,
};
}
for mut camera in query.iter_mut() {
if camera.enabled {
camera.distance *= camera.zoom_sensitivity.powf(total);
}
}
}
}
impl Plugin for OrbitCameraPlugin {
fn build(&self, app: &mut App) {
app.add_systems(Update, Self::mouse_motion_system)
.add_systems(Update, Self::zoom_system)
.add_systems(Update, Self::update_transform_system);
}
}
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