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side_panel.rs
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side_panel.rs
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use bevy::{prelude::*, window::PresentMode, winit::WinitSettings};
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)
// Optimal power saving and present mode settings for desktop apps.
.insert_resource(WinitSettings::desktop_app())
.insert_resource(WindowDescriptor {
present_mode: PresentMode::Mailbox,
..Default::default()
})
.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,
));
}