5ca6ae9106
* feat(rapier_testbed): autosave testbed configuration + add support for per-example parameters * feat(rapier_testbed): also save the camera position * feat(rapier_testbed): improve ergonomics of example-specific settings * chore: cargo fmt * chore(rapier_testbed): small UI ergonomics improvement * chore(rapier_testbed): clippy fixes
96 lines
3.0 KiB
Rust
96 lines
3.0 KiB
Rust
// NOTE: this is inspired from the `bevy-orbit-controls` projects but
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// with some modifications like Panning, and 2D support.
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// Most of these modifications have been contributed upstream.
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use bevy::input::mouse::MouseMotion;
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use bevy::input::mouse::MouseScrollUnit::{Line, Pixel};
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use bevy::input::mouse::MouseWheel;
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use bevy::prelude::*;
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use bevy::render::camera::Camera;
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const LINE_TO_PIXEL_RATIO: f32 = 0.1;
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#[derive(Component, PartialEq, Debug, Clone, serde::Serialize, serde::Deserialize)]
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pub struct OrbitCamera {
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pub zoom: f32,
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pub center: Vec3,
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pub pan_sensitivity: f32,
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pub zoom_sensitivity: f32,
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pub pan_button: MouseButton,
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pub enabled: bool,
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}
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impl Default for OrbitCamera {
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fn default() -> Self {
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OrbitCamera {
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zoom: 100.0,
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center: Vec3::ZERO,
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pan_sensitivity: 1.0,
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zoom_sensitivity: 0.8,
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pan_button: MouseButton::Right,
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enabled: true,
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}
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}
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}
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// Adapted from the 3D orbit camera from bevy-orbit-controls
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pub struct OrbitCameraPlugin;
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impl OrbitCameraPlugin {
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#[allow(clippy::type_complexity)]
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fn update_transform_system(
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mut query: Query<(&OrbitCamera, &mut Transform), (Changed<OrbitCamera>, With<Camera>)>,
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) {
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for (camera, mut transform) in query.iter_mut() {
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transform.translation = camera.center;
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transform.scale = Vec3::new(1.0 / camera.zoom, 1.0 / camera.zoom, 1.0);
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}
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}
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fn mouse_motion_system(
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_time: Res<Time>,
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mut mouse_motion_events: EventReader<MouseMotion>,
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mouse_button_input: Res<ButtonInput<MouseButton>>,
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mut query: Query<(&mut OrbitCamera, &mut Transform, &mut Camera)>,
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) {
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let mut delta = Vec2::ZERO;
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for event in mouse_motion_events.read() {
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delta += event.delta;
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}
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for (mut camera, _, _) in query.iter_mut() {
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if !camera.enabled {
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continue;
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}
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if mouse_button_input.pressed(camera.pan_button) {
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let delta = delta * camera.pan_sensitivity;
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camera.center += Vec3::new(-delta.x, delta.y, 0.0);
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}
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}
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}
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fn zoom_system(
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mut mouse_wheel_events: EventReader<MouseWheel>,
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mut query: Query<&mut OrbitCamera, With<Camera>>,
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) {
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let mut total = 0.0;
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for event in mouse_wheel_events.read() {
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total -= event.y
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* match event.unit {
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Line => 1.0,
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Pixel => LINE_TO_PIXEL_RATIO,
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};
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}
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for mut camera in query.iter_mut() {
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if camera.enabled {
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camera.zoom *= camera.zoom_sensitivity.powf(total);
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}
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}
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}
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}
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impl Plugin for OrbitCameraPlugin {
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fn build(&self, app: &mut App) {
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app.add_systems(Update, Self::mouse_motion_system)
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.add_systems(Update, Self::zoom_system)
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.add_systems(Update, Self::update_transform_system);
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}
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}
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