use std::f32::consts::PI;
use bevy::prelude::*;
fn main() {
App::new()
.add_plugins(DefaultPlugins)
.add_systems(Startup, setup)
.add_systems(Update, (system, rotate_camera, update_config))
.run();
}
fn setup(
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
) {
commands.spawn(Camera3dBundle {
transform: Transform::from_xyz(0., 1.5, 6.).looking_at(Vec3::ZERO, Vec3::Y),
..default()
});
commands.spawn(PbrBundle {
mesh: meshes.add(Mesh::from(shape::Plane::from_size(5.0))),
material: materials.add(Color::rgb(0.3, 0.5, 0.3).into()),
..default()
});
commands.spawn(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()
});
commands.spawn(PointLightBundle {
point_light: PointLight {
intensity: 1500.0,
shadows_enabled: true,
..default()
},
transform: Transform::from_xyz(4.0, 8.0, 4.0),
..default()
});
commands.spawn(
TextBundle::from_section(
"Press 'D' to toggle drawing gizmos on top of everything else in the scene\n\
Press 'P' to toggle perspective for line gizmos\n\
Hold 'Left' or 'Right' to change the line width",
TextStyle {
font_size: 20.,
..default()
},
)
.with_style(Style {
position_type: PositionType::Absolute,
top: Val::Px(12.0),
left: Val::Px(12.0),
..default()
}),
);
}
fn system(mut gizmos: Gizmos, time: Res<Time>) {
gizmos.cuboid(
Transform::from_translation(Vec3::Y * 0.5).with_scale(Vec3::splat(1.)),
Color::BLACK,
);
gizmos.rect(
Vec3::new(time.elapsed_seconds().cos() * 2.5, 1., 0.),
Quat::from_rotation_y(PI / 2.),
Vec2::splat(2.),
Color::GREEN,
);
gizmos.sphere(Vec3::new(1., 0.5, 0.), Quat::IDENTITY, 0.5, Color::RED);
for y in [0., 0.5, 1.] {
gizmos.ray(
Vec3::new(1., y, 0.),
Vec3::new(-3., (time.elapsed_seconds() * 3.).sin(), 0.),
Color::BLUE,
);
}
gizmos.circle(Vec3::ZERO, Vec3::Y, 3., Color::BLACK);
gizmos
.circle(Vec3::ZERO, Vec3::Y, 3.1, Color::NAVY)
.segments(64);
gizmos
.sphere(Vec3::ZERO, Quat::IDENTITY, 3.2, Color::BLACK)
.circle_segments(64);
}
fn rotate_camera(mut query: Query<&mut Transform, With<Camera>>, time: Res<Time>) {
let mut transform = query.single_mut();
transform.rotate_around(Vec3::ZERO, Quat::from_rotation_y(time.delta_seconds() / 2.));
}
fn update_config(mut config: ResMut<GizmoConfig>, keyboard: Res<Input<KeyCode>>, time: Res<Time>) {
if keyboard.just_pressed(KeyCode::D) {
config.depth_bias = if config.depth_bias == 0. { -1. } else { 0. };
}
if keyboard.just_pressed(KeyCode::P) {
config.line_perspective ^= true;
config.line_width *= if config.line_perspective { 5. } else { 1. / 5. };
}
if keyboard.pressed(KeyCode::Right) {
config.line_width += 5. * time.delta_seconds();
}
if keyboard.pressed(KeyCode::Left) {
config.line_width -= 5. * time.delta_seconds();
}
}