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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| use bevy::prelude::*; | ||
| use bevy_egui::{egui, EguiContext, EguiPlugin}; | ||
|
|
||
| #[derive(Default)] | ||
| struct OccupiedScreenSpace { | ||
| left: f32, | ||
| top: f32, | ||
| right: f32, | ||
| bottom: f32, | ||
| } | ||
|
|
||
| const CAMERA_TARGET: Vec3 = Vec3::ZERO; | ||
|
|
||
| struct OriginalCameraTransform(Transform); | ||
|
|
||
| fn main() { | ||
| App::new() | ||
| .add_plugins(DefaultPlugins) | ||
| .add_plugin(EguiPlugin) | ||
| .init_resource::<OccupiedScreenSpace>() | ||
| .add_startup_system(setup_system) | ||
| .add_system(ui_example_system) | ||
| .add_system(update_camera_transform_system) | ||
| .run(); | ||
| } | ||
|
|
||
| fn ui_example_system( | ||
| mut egui_context: ResMut<EguiContext>, | ||
| mut occupied_screen_space: ResMut<OccupiedScreenSpace>, | ||
| ) { | ||
| occupied_screen_space.left = egui::SidePanel::left("left_panel") | ||
| .resizable(true) | ||
| .show(egui_context.ctx_mut(), |ui| { | ||
| ui.allocate_rect(ui.available_rect_before_wrap(), egui::Sense::hover()); | ||
| }) | ||
| .response | ||
| .rect | ||
| .width(); | ||
| occupied_screen_space.right = egui::SidePanel::right("right_panel") | ||
| .resizable(true) | ||
| .show(egui_context.ctx_mut(), |ui| { | ||
| ui.allocate_rect(ui.available_rect_before_wrap(), egui::Sense::hover()); | ||
| }) | ||
| .response | ||
| .rect | ||
| .width(); | ||
| occupied_screen_space.top = egui::TopBottomPanel::top("top_panel") | ||
| .resizable(true) | ||
| .show(egui_context.ctx_mut(), |ui| { | ||
| ui.allocate_rect(ui.available_rect_before_wrap(), egui::Sense::hover()); | ||
| }) | ||
| .response | ||
| .rect | ||
| .height(); | ||
| occupied_screen_space.bottom = egui::TopBottomPanel::bottom("bottom_panel") | ||
| .resizable(true) | ||
| .show(egui_context.ctx_mut(), |ui| { | ||
| ui.allocate_rect(ui.available_rect_before_wrap(), egui::Sense::hover()); | ||
| }) | ||
| .response | ||
| .rect | ||
| .height(); | ||
| } | ||
|
|
||
| fn setup_system( | ||
| mut commands: Commands, | ||
| mut meshes: ResMut<Assets<Mesh>>, | ||
| mut materials: ResMut<Assets<StandardMaterial>>, | ||
| ) { | ||
| commands.spawn_bundle(PbrBundle { | ||
| mesh: meshes.add(Mesh::from(shape::Plane { size: 5.0 })), | ||
| material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()), | ||
| ..Default::default() | ||
| }); | ||
| commands.spawn_bundle(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::default() | ||
| }); | ||
| commands.spawn_bundle(PointLightBundle { | ||
| point_light: PointLight { | ||
| intensity: 1500.0, | ||
| shadows_enabled: true, | ||
| ..Default::default() | ||
| }, | ||
| transform: Transform::from_xyz(4.0, 8.0, 4.0), | ||
| ..Default::default() | ||
| }); | ||
|
|
||
| let camera_pos = Vec3::new(-2.0, 2.5, 5.0); | ||
| let camera_transform = | ||
| Transform::from_translation(camera_pos).looking_at(CAMERA_TARGET, Vec3::Y); | ||
| commands.insert_resource(OriginalCameraTransform(camera_transform)); | ||
|
|
||
| commands.spawn_bundle(PerspectiveCameraBundle { | ||
| transform: camera_transform, | ||
| ..Default::default() | ||
| }); | ||
| } | ||
|
|
||
| fn update_camera_transform_system( | ||
| occupied_screen_space: Res<OccupiedScreenSpace>, | ||
| original_camera_transform: Res<OriginalCameraTransform>, | ||
| windows: Res<Windows>, | ||
| mut camera_query: Query<(&PerspectiveProjection, &mut Transform)>, | ||
| ) { | ||
| let (camera_projection, mut transform) = camera_query.get_single_mut().unwrap(); | ||
|
|
||
| let distance_to_target = (CAMERA_TARGET - original_camera_transform.0.translation).length(); | ||
| let frustum_height = 2.0 * distance_to_target * (camera_projection.fov * 0.5).tan(); | ||
| let frustum_width = frustum_height * camera_projection.aspect_ratio; | ||
|
|
||
| let window = windows.get_primary().unwrap(); | ||
|
|
||
| let left_taken = occupied_screen_space.left / window.width(); | ||
| let right_taken = occupied_screen_space.right / window.width(); | ||
| let top_taken = occupied_screen_space.top / window.height(); | ||
| let bottom_taken = occupied_screen_space.bottom / window.height(); | ||
| transform.translation = original_camera_transform.0.translation | ||
| + transform.rotation.mul_vec3(Vec3::new( | ||
| (right_taken - left_taken) * frustum_width * 0.5, | ||
| (top_taken - bottom_taken) * frustum_height * 0.5, | ||
| 0.0, | ||
| )); | ||
| } |