bevy_panorbit_camera 0.16.1

#![warn(missing_docs)]
#![doc = include_str!("../README.md")]

use std::f32::consts::{PI, TAU};

use bevy::input::mouse::MouseWheel;
use bevy::prelude::*;
use bevy::render::camera::RenderTarget;
use bevy::window::{PrimaryWindow, WindowRef};
#[cfg(feature = "bevy_egui")]
use bevy_egui::EguiSet;

#[cfg(feature = "bevy_egui")]
pub use crate::egui::EguiWantsFocus;
use crate::input::{mouse_key_tracker, MouseKeyTracker};
pub use crate::touch::TouchControls;
use crate::touch::{touch_tracker, TouchGestures, TouchTracker};
use crate::traits::OptionalClamp;

#[cfg(feature = "bevy_egui")]
mod egui;
mod input;
mod touch;
mod traits;
mod util;

/// Bevy plugin that contains the systems for controlling `PanOrbitCamera` components.
/// # Example
/// ```no_run
/// # use bevy::prelude::*;
/// # use bevy_panorbit_camera::{PanOrbitCameraPlugin, PanOrbitCamera};
/// fn main() {
///     App::new()
///         .add_plugins(DefaultPlugins)
///         .add_plugins(PanOrbitCameraPlugin)
///         .run();
/// }
/// ```
pub struct PanOrbitCameraPlugin;

impl Plugin for PanOrbitCameraPlugin {
    fn build(&self, app: &mut App) {
        app.init_resource::<ActiveCameraData>()
            .init_resource::<MouseKeyTracker>()
            .init_resource::<TouchTracker>()
            .add_systems(
                Update,
                (
                    (
                        active_viewport_data
                            .run_if(|active_cam: Res<ActiveCameraData>| !active_cam.manual),
                        mouse_key_tracker,
                        touch_tracker,
                    ),
                    pan_orbit_camera,
                )
                    .chain()
                    .in_set(PanOrbitCameraSystemSet),
            );

        #[cfg(feature = "bevy_egui")]
        {
            app.init_resource::<EguiWantsFocus>()
                .add_systems(
                    Update,
                    egui::check_egui_wants_focus
                        .after(EguiSet::InitContexts)
                        .before(PanOrbitCameraSystemSet),
                )
                .configure_sets(
                    Update,
                    PanOrbitCameraSystemSet.run_if(resource_equals(EguiWantsFocus {
                        prev: false,
                        curr: false,
                    })),
                );
        }
    }
}

/// Base system set to allow ordering of `PanOrbitCamera`
#[derive(SystemSet, Debug, Hash, PartialEq, Eq, Clone)]
pub struct PanOrbitCameraSystemSet;

/// Tags an entity as capable of panning and orbiting, and provides a way to configure the
/// camera's behaviour and controls.
/// The entity must have `Transform` and `Projection` components. Typically you would add a
/// `Camera3dBundle` which already contains these.
/// # Example
/// ```no_run
/// # use bevy::prelude::*;
/// # use bevy_panorbit_camera::{PanOrbitCameraPlugin, PanOrbitCamera};
/// # fn main() {
/// #     App::new()
/// #         .add_plugins(DefaultPlugins)
/// #         .add_plugins(PanOrbitCameraPlugin)
/// #         .add_systems(Startup, setup)
/// #         .run();
/// # }
/// fn setup(mut commands: Commands) {
///     commands
///         .spawn((
///             Camera3dBundle {
///                 transform: Transform::from_translation(Vec3::new(0.0, 1.5, 5.0)),
///                 ..default()
///             },
///             PanOrbitCamera::default(),
///         ));
///  }
/// ```
#[derive(Component, Copy, Clone, Debug, PartialEq)]
pub struct PanOrbitCamera {
    /// The point to orbit around, and what the camera looks at. Updated automatically.
    /// If you want to change the focus programmatically after initialization, set `target_focus`
    /// instead.
    /// Defaults to `Vec3::ZERO`.
    pub focus: Vec3,
    /// The radius of the orbit, or the distance from the `focus` point.
    /// For orthographic projection, this is ignored, and the projection's `scale` is used instead.
    /// If set to `None`, it will be calculated from the camera's current position during
    /// initialization.
    /// Automatically updated.
    /// Defaults to `None`.
    pub radius: Option<f32>,
    /// Rotation in radians around the global Y axis (longitudinal). Updated automatically.
    /// If both `alpha` and `beta` are `0.0`, then the camera will be looking forward, i.e. in
    /// the `Vec3::NEG_Z` direction, with up being `Vec3::Y`.
    /// If set to `None`, it will be calculated from the camera's current position during
    /// initialization.
    /// You should not update this after initialization - use `target_alpha` instead.
    /// Defaults to `None`.
    pub alpha: Option<f32>,
    /// Rotation in radians around the local X axis (latitudinal). Updated automatically.
    /// If both `alpha` and `beta` are `0.0`, then the camera will be looking forward, i.e. in
    /// the `Vec3::NEG_Z` direction, with up being `Vec3::Y`.
    /// If set to `None`, it will be calculated from the camera's current position during
    /// initialization.
    /// You should not update this after initialization - use `target_beta` instead.
    /// Defaults to `None`.
    pub beta: Option<f32>,
    /// The target focus point. The camera will smoothly transition to this value. Updated
    /// automatically, but you can also update it manually to control the camera independently of
    /// the mouse controls, e.g. with the keyboard.
    /// Defaults to `Vec3::ZERO`.
    pub target_focus: Vec3,
    /// The target alpha value. The camera will smoothly transition to this value. Updated
    /// automatically, but you can also update it manually to control the camera independently of
    /// the mouse controls, e.g. with the keyboard.
    /// Defaults to `0.0`.
    pub target_alpha: f32,
    /// The target beta value. The camera will smoothly transition to this value Updated
    /// automatically, but you can also update it manually to control the camera independently of
    /// the mouse controls, e.g. with the keyboard.
    /// Defaults to `0.0`.
    pub target_beta: f32,
    /// The target radius value. The camera will smoothly transition to this value. Updated
    /// automatically, but you can also update it manually to control the camera independently of
    /// the mouse controls, e.g. with the keyboard.
    /// Defaults to `1.0`.
    pub target_radius: f32,
    /// Upper limit on the `alpha` value, in radians. Use this to restrict the maximum rotation
    /// around the global Y axis.
    /// Defaults to `None`.
    pub alpha_upper_limit: Option<f32>,
    /// Lower limit on the `alpha` value, in radians. Use this to restrict the maximum rotation
    /// around the global Y axis.
    /// Defaults to `None`.
    pub alpha_lower_limit: Option<f32>,
    /// Upper limit on the `beta` value, in radians. Use this to restrict the maximum rotation
    /// around the local X axis.
    /// Defaults to `None`.
    pub beta_upper_limit: Option<f32>,
    /// Lower limit on the `beta` value, in radians. Use this to restrict the maximum rotation
    /// around the local X axis.
    /// Defaults to `None`.
    pub beta_lower_limit: Option<f32>,
    /// Upper limit on the zoom. This applies to `radius`, in the case of using a perspective
    /// camera, or the projection scale in the case of using an orthographic
    /// camera. Note that the zoom value (radius or scale) will never go below `0.02`.
    /// Defaults to `None`.
    pub zoom_upper_limit: Option<f32>,
    /// Lower limit on the zoom. This applies to `radius`, in the case of using a perspective
    /// camera, or the projection scale in the case of using an orthographic
    /// camera. Note that the zoom value (radius or scale) will never go below `0.02`.
    /// Defaults to `None`.
    pub zoom_lower_limit: Option<f32>,
    /// The sensitivity of the orbiting motion.
    /// Defaults to `1.0`.
    pub orbit_sensitivity: f32,
    /// How much smoothing is applied to the orbit motion. A value of `0.0` disables smoothing,
    /// so there's a 1:1 mapping of input to camera position. A value of `1.0` is infinite
    /// smoothing.
    /// Defaults to `0.8`.
    pub orbit_smoothness: f32,
    /// The sensitivity of the panning motion.
    /// Defaults to `1.0`.
    pub pan_sensitivity: f32,
    /// How much smoothing is applied to the panning motion. A value of `0.0` disables smoothing,
    /// so there's a 1:1 mapping of input to camera position. A value of `1.0` is infinite
    /// smoothing.
    /// Defaults to `0.6`.
    pub pan_smoothness: f32,
    /// The sensitivity of moving the camera closer or further way using the scroll wheel.
    /// Defaults to `1.0`.
    pub zoom_sensitivity: f32,
    /// How much smoothing is applied to the zoom motion. A value of `0.0` disables smoothing,
    /// so there's a 1:1 mapping of input to camera position. A value of `1.0` is infinite
    /// smoothing.
    /// Defaults to `0.8`.
    /// Note that this setting does not apply to pixel-based scroll events, as they are typically
    /// already smooth. It only applies to line-based scroll events.
    pub zoom_smoothness: f32,
    /// Button used to orbit the camera.
    /// Defaults to `Button::Left`.
    pub button_orbit: MouseButton,
    /// Button used to pan the camera.
    /// Defaults to `Button::Right`.
    pub button_pan: MouseButton,
    /// Key that must be pressed for `button_orbit` to work.
    /// Defaults to `None` (no modifier).
    pub modifier_orbit: Option<KeyCode>,
    /// Key that must be pressed for `button_pan` to work.
    /// Defaults to `None` (no modifier).
    pub modifier_pan: Option<KeyCode>,
    /// Whether touch controls are enabled.
    /// Defaults to `true`.
    pub touch_enabled: bool,
    /// The control scheme for touch inputs.
    /// Defaults to `TouchControls::OneFingerOrbit`.
    pub touch_controls: TouchControls,
    /// Whether to reverse the zoom direction.
    /// Defaults to `false`.
    pub reversed_zoom: bool,
    /// Whether the camera is currently upside down. Updated automatically.
    /// This is used to determine which way to orbit, because it's more intuitive to reverse the
    /// orbit direction when upside down.
    /// Should not be set manually unless you know what you're doing.
    /// Defaults to `false` (but will be updated immediately).
    pub is_upside_down: bool,
    /// Whether to allow the camera to go upside down.
    /// Defaults to `false`.
    pub allow_upside_down: bool,
    /// If `false`, disable control of the camera. Defaults to `true`.
    pub enabled: bool,
    /// Whether `PanOrbitCamera` has been initialized with the initial config.
    /// Set to `true` if you want the camera to smoothly animate to its initial position.
    /// Defaults to `false`.
    pub initialized: bool,
    /// Whether to update the camera's transform regardless of whether there are any changes/input.
    /// Set this to `true` if you want to modify values directly.
    /// This will be automatically set back to `false` after one frame.
    /// Defaults to `false`.
    pub force_update: bool,
}

impl Default for PanOrbitCamera {
    fn default() -> Self {
        PanOrbitCamera {
            focus: Vec3::ZERO,
            target_focus: Vec3::ZERO,
            radius: None,
            is_upside_down: false,
            allow_upside_down: false,
            orbit_sensitivity: 1.0,
            orbit_smoothness: 0.1,
            pan_sensitivity: 1.0,
            pan_smoothness: 0.02,
            zoom_sensitivity: 1.0,
            zoom_smoothness: 0.1,
            button_orbit: MouseButton::Left,
            button_pan: MouseButton::Right,
            modifier_orbit: None,
            modifier_pan: None,
            touch_enabled: true,
            touch_controls: TouchControls::OneFingerOrbit,
            reversed_zoom: false,
            enabled: true,
            alpha: None,
            beta: None,
            target_alpha: 0.0,
            target_beta: 0.0,
            target_radius: 1.0,
            initialized: false,
            alpha_upper_limit: None,
            alpha_lower_limit: None,
            beta_upper_limit: None,
            beta_lower_limit: None,
            zoom_upper_limit: None,
            zoom_lower_limit: None,
            force_update: false,
        }
    }
}

/// Tracks which `PanOrbitCamera` is active (should handle input events), along with the window
/// and viewport dimensions, which are used for scaling mouse motion.
/// `PanOrbitCameraPlugin` manages this resource automatically, in order to support multiple
/// viewports/windows. However, if this doesn't work for you, you can take over and manage it
/// yourself, e.g. when you want to control a camera that is rendering to a texture.
#[derive(Resource, Default, Debug, PartialEq)]
pub struct ActiveCameraData {
    /// ID of the entity with `PanOrbitCamera` that will handle user input. In other words, this
    /// is the camera that will move when you orbit/pan/zoom.
    pub entity: Option<Entity>,
    /// The viewport size. This is only used to scale the panning mouse motion. I recommend setting
    /// this to the actual render target dimensions (e.g. the image or viewport), and changing
    /// `PanOrbitCamera::pan_sensitivity` to adjust the sensitivity if required.
    pub viewport_size: Option<Vec2>,
    /// The size of the window. This is only used to scale the orbit mouse motion. I recommend
    /// setting this to actual dimensions of the window that you want to control the camera from,
    /// and changing `PanOrbitCamera::orbit_sensitivity` to adjust the sensitivity if required.
    pub window_size: Option<Vec2>,
    /// Indicates to `PanOrbitCameraPlugin` that it should not update/overwrite this resource.
    /// If you are manually updating this resource you should set this to `true`.
    /// Note that setting this to `true` will effectively break multiple viewport/window support
    /// unless you manually reimplement it.
    pub manual: bool,
}

/// Gather data about the active viewport, i.e. the viewport the user is interacting with.
/// Enables multiple viewports/windows.
#[allow(clippy::too_many_arguments)]
fn active_viewport_data(
    mut active_cam: ResMut<ActiveCameraData>,
    mouse_input: Res<ButtonInput<MouseButton>>,
    key_input: Res<ButtonInput<KeyCode>>,
    scroll_events: EventReader<MouseWheel>,
    touches: Res<Touches>,
    primary_windows: Query<&Window, With<PrimaryWindow>>,
    other_windows: Query<&Window, Without<PrimaryWindow>>,
    orbit_cameras: Query<(Entity, &Camera, &PanOrbitCamera)>,
) {
    let mut new_resource = ActiveCameraData::default();
    let mut max_cam_order = 0;

    let mut has_input = false;
    for (entity, camera, pan_orbit) in orbit_cameras.iter() {
        let input_just_activated = input::orbit_just_pressed(pan_orbit, &mouse_input, &key_input)
            || input::pan_just_pressed(pan_orbit, &mouse_input, &key_input)
            || !scroll_events.is_empty()
            || (touches.iter_just_pressed().count() > 0
                && touches.iter_just_pressed().count() == touches.iter().count());

        if input_just_activated {
            has_input = true;
            // First check if cursor is in the same window as this camera
            if let RenderTarget::Window(win_ref) = camera.target {
                let Some(window) = (match win_ref {
                    WindowRef::Primary => primary_windows.get_single().ok(),
                    WindowRef::Entity(entity) => other_windows.get(entity).ok(),
                }) else {
                    // Window does not exist - maybe it was closed and the camera not cleaned up
                    continue;
                };

                // Is the cursor/touch in this window?
                // Note: there's a bug in winit that causes `window.cursor_position()` to return
                // a `Some` value even if the cursor is not in this window, in very specific cases.
                // See: https://github.com/Plonq/bevy_panorbit_camera/issues/22
                if let Some(input_position) = window.cursor_position().or(touches
                    .iter_just_pressed()
                    .collect::<Vec<_>>()
                    .first()
                    .map(|touch| touch.position()))
                {
                    // Now check if cursor is within this camera's viewport
                    if let Some(Rect { min, max }) = camera.logical_viewport_rect() {
                        // Window coordinates have Y starting at the bottom, so we need to reverse
                        // the y component before comparing with the viewport rect
                        let cursor_in_vp = input_position.x > min.x
                            && input_position.x < max.x
                            && input_position.y > min.y
                            && input_position.y < max.y;

                        // Only set if camera order is higher. This may overwrite a previous value
                        // in the case the viewport is overlapping another viewport.
                        if cursor_in_vp && camera.order >= max_cam_order {
                            new_resource = ActiveCameraData {
                                entity: Some(entity),
                                viewport_size: camera.logical_viewport_size(),
                                window_size: Some(Vec2::new(window.width(), window.height())),
                                manual: false,
                            };
                            max_cam_order = camera.order;
                        }
                    }
                }
            }
        }
    }

    if has_input {
        active_cam.set_if_neq(new_resource);
    }
}

/// Main system for processing input and converting to transformations
fn pan_orbit_camera(
    active_cam: Res<ActiveCameraData>,
    mouse_key_tracker: Res<MouseKeyTracker>,
    touch_tracker: Res<TouchTracker>,
    mut orbit_cameras: Query<(Entity, &mut PanOrbitCamera, &mut Transform, &mut Projection)>,
    time: Res<Time>,
) {
    for (entity, mut pan_orbit, mut transform, mut projection) in orbit_cameras.iter_mut() {
        // Closures that apply limits to the alpha, beta, and zoom values
        let apply_zoom_limits = {
            let zoom_upper_limit = pan_orbit.zoom_upper_limit;
            let zoom_lower_limit = pan_orbit.zoom_lower_limit;
            move |zoom: f32| {
                zoom.clamp_optional(zoom_lower_limit, zoom_upper_limit)
                    .max(0.05)
            }
        };

        let apply_alpha_limits = {
            let alpha_upper_limit = pan_orbit.alpha_upper_limit;
            let alpha_lower_limit = pan_orbit.alpha_lower_limit;
            move |alpha: f32| alpha.clamp_optional(alpha_lower_limit, alpha_upper_limit)
        };

        let apply_beta_limits = {
            let beta_upper_limit = pan_orbit.beta_upper_limit;
            let beta_lower_limit = pan_orbit.beta_lower_limit;
            move |beta: f32| beta.clamp_optional(beta_lower_limit, beta_upper_limit)
        };

        if !pan_orbit.initialized {
            // Calculate alpha, beta, and radius from the camera's position. If user sets all
            // these explicitly, this calculation is wasted, but that's okay since it will only run
            // once on init.
            let (alpha, beta, radius) =
                util::calculate_from_translation_and_focus(transform.translation, pan_orbit.focus);
            let &mut mut alpha = pan_orbit.alpha.get_or_insert(alpha);
            let &mut mut beta = pan_orbit.beta.get_or_insert(beta);
            let &mut mut radius = pan_orbit.radius.get_or_insert(radius);

            // Apply limits
            alpha = apply_alpha_limits(alpha);
            beta = apply_beta_limits(beta);
            radius = apply_zoom_limits(radius);

            // Set initial values
            pan_orbit.alpha = Some(alpha);
            pan_orbit.beta = Some(beta);
            pan_orbit.radius = Some(radius);
            pan_orbit.target_alpha = alpha;
            pan_orbit.target_beta = beta;
            pan_orbit.target_radius = radius;
            pan_orbit.target_focus = pan_orbit.focus;

            util::update_orbit_transform(
                alpha,
                beta,
                radius,
                pan_orbit.focus,
                &mut transform,
                &mut projection,
            );

            pan_orbit.initialized = true;
        }

        // 1 - Get Input

        let mut orbit = Vec2::ZERO;
        let mut pan = Vec2::ZERO;
        let mut scroll_line = 0.0;
        let mut scroll_pixel = 0.0;
        let mut orbit_button_changed = false;

        // The reason we only skip getting input if the camera is inactive/disabled is because
        // it might still be moving (lerping towards target values) when the user is not
        // actively controlling it.
        if pan_orbit.enabled && active_cam.entity == Some(entity) {
            let zoom_direction = match pan_orbit.reversed_zoom {
                true => -1.0,
                false => 1.0,
            };

            orbit = mouse_key_tracker.orbit * pan_orbit.orbit_sensitivity;
            pan = mouse_key_tracker.pan * pan_orbit.pan_sensitivity;
            scroll_line =
                mouse_key_tracker.scroll_line * zoom_direction * pan_orbit.zoom_sensitivity;
            scroll_pixel =
                mouse_key_tracker.scroll_pixel * zoom_direction * pan_orbit.zoom_sensitivity;
            orbit_button_changed = mouse_key_tracker.orbit_button_changed;

            if pan_orbit.touch_enabled {
                let (touch_orbit, touch_pan, touch_zoom_pixel) = match pan_orbit.touch_controls {
                    TouchControls::OneFingerOrbit => match touch_tracker.get_touch_gestures() {
                        TouchGestures::None => (Vec2::ZERO, Vec2::ZERO, 0.0),
                        TouchGestures::OneFinger(one_finger_gestures) => {
                            (one_finger_gestures.motion, Vec2::ZERO, 0.0)
                        }
                        TouchGestures::TwoFinger(two_finger_gestures) => (
                            Vec2::ZERO,
                            two_finger_gestures.motion,
                            two_finger_gestures.pinch * 0.015,
                        ),
                    },
                    TouchControls::TwoFingerOrbit => match touch_tracker.get_touch_gestures() {
                        TouchGestures::None => (Vec2::ZERO, Vec2::ZERO, 0.0),
                        TouchGestures::OneFinger(one_finger_gestures) => {
                            (Vec2::ZERO, one_finger_gestures.motion, 0.0)
                        }
                        TouchGestures::TwoFinger(two_finger_gestures) => (
                            two_finger_gestures.motion,
                            Vec2::ZERO,
                            two_finger_gestures.pinch * 0.015,
                        ),
                    },
                };

                orbit += touch_orbit * pan_orbit.orbit_sensitivity;
                pan += touch_pan * pan_orbit.pan_sensitivity;
                scroll_pixel += touch_zoom_pixel * zoom_direction * pan_orbit.zoom_sensitivity;
            }
        }

        // 2 - Process input into target alpha/beta, or focus, radius

        if orbit_button_changed {
            // Only check for upside down when orbiting started or ended this frame,
            // so we don't reverse the alpha direction while the user is still dragging
            let wrapped_beta = (pan_orbit.target_beta % TAU).abs();
            pan_orbit.is_upside_down = wrapped_beta > TAU / 4.0 && wrapped_beta < 3.0 * TAU / 4.0;
        }

        let mut has_moved = false;
        if orbit.length_squared() > 0.0 {
            // Use window size for rotation otherwise the sensitivity
            // is far too high for small viewports
            if let Some(win_size) = active_cam.window_size {
                let delta_x = {
                    let delta = orbit.x / win_size.x * PI * 2.0;
                    if pan_orbit.is_upside_down {
                        -delta
                    } else {
                        delta
                    }
                };
                let delta_y = orbit.y / win_size.y * PI;
                pan_orbit.target_alpha -= delta_x;
                pan_orbit.target_beta += delta_y;

                has_moved = true;
            }
        }
        if pan.length_squared() > 0.0 {
            // Make panning distance independent of resolution and FOV,
            if let Some(vp_size) = active_cam.viewport_size {
                let mut multiplier = 1.0;
                match *projection {
                    Projection::Perspective(ref p) => {
                        pan *= Vec2::new(p.fov * p.aspect_ratio, p.fov) / vp_size;
                        // Make panning proportional to distance away from focus point
                        if let Some(radius) = pan_orbit.radius {
                            multiplier = radius;
                        }
                    }
                    Projection::Orthographic(ref p) => {
                        pan *= Vec2::new(p.area.width(), p.area.height()) / vp_size;
                    }
                }
                // Translate by local axes
                let right = transform.rotation * Vec3::X * -pan.x;
                let up = transform.rotation * Vec3::Y * pan.y;
                let translation = (right + up) * multiplier;
                pan_orbit.target_focus += translation;
                has_moved = true;
            }
        }
        if (scroll_line + scroll_pixel).abs() > 0.0 {
            // Calculate the impact of scrolling on the reference value
            let line_delta = -scroll_line * (pan_orbit.target_radius) * 0.2;
            let pixel_delta = -scroll_pixel * (pan_orbit.target_radius) * 0.2;

            // Update the target value
            pan_orbit.target_radius += line_delta + pixel_delta;

            // If it is pixel-based scrolling, add it directly to the current value
            pan_orbit.radius = pan_orbit
                .radius
                .map(|value| apply_zoom_limits(value + pixel_delta));

            has_moved = true;
        }

        // 3 - Apply constraints

        pan_orbit.target_alpha = apply_alpha_limits(pan_orbit.target_alpha);
        pan_orbit.target_beta = apply_beta_limits(pan_orbit.target_beta);
        pan_orbit.target_radius = apply_zoom_limits(pan_orbit.target_radius);

        if !pan_orbit.allow_upside_down {
            pan_orbit.target_beta = pan_orbit.target_beta.clamp(-PI / 2.0, PI / 2.0);
        }

        // 4 - Update the camera's transform based on current values

        if let (Some(alpha), Some(beta), Some(radius)) =
            (pan_orbit.alpha, pan_orbit.beta, pan_orbit.radius)
        {
            if has_moved
                // For smoothed values, we must check whether current value is different from target
                // value. If we only checked whether the values were non-zero this frame, then
                // the camera would instantly stop moving as soon as you stopped moving it, instead
                // of smoothly stopping
                || pan_orbit.target_alpha != alpha
                || pan_orbit.target_beta != beta
                || pan_orbit.target_radius != radius
                || pan_orbit.target_focus != pan_orbit.focus
                || pan_orbit.force_update
            {
                // Interpolate towards the target values
                let new_alpha = util::lerp_and_snap_f32(
                    alpha,
                    pan_orbit.target_alpha,
                    pan_orbit.orbit_smoothness,
                    time.delta_seconds(),
                );
                let new_beta = util::lerp_and_snap_f32(
                    beta,
                    pan_orbit.target_beta,
                    pan_orbit.orbit_smoothness,
                    time.delta_seconds(),
                );
                let new_radius = util::lerp_and_snap_f32(
                    radius,
                    pan_orbit.target_radius,
                    pan_orbit.zoom_smoothness,
                    time.delta_seconds(),
                );
                let new_focus = util::lerp_and_snap_vec3(
                    pan_orbit.focus,
                    pan_orbit.target_focus,
                    pan_orbit.pan_smoothness,
                    time.delta_seconds(),
                );

                util::update_orbit_transform(
                    new_alpha,
                    new_beta,
                    new_radius,
                    new_focus,
                    &mut transform,
                    &mut projection,
                );

                // Update the current values
                pan_orbit.alpha = Some(new_alpha);
                pan_orbit.beta = Some(new_beta);
                pan_orbit.radius = Some(new_radius);
                pan_orbit.focus = new_focus;
                pan_orbit.force_update = false;
            }
        }
    }
}