Created
January 5, 2022 14:25
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Bevy Text 2D example
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use bevy::prelude::*; | |
fn main() { | |
App::build() | |
.add_plugins(DefaultPlugins) | |
.add_startup_system(setup.system()) | |
.add_system(animate_translation.system()) | |
.add_system(animate_rotation.system()) | |
.add_system(animate_scale.system()) | |
.run(); | |
} | |
struct AnimateTranslation; | |
struct AnimateRotation; | |
struct AnimateScale; | |
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) { | |
let font = asset_server.load("fonts/FiraSans-Bold.ttf"); | |
let text_style = TextStyle { | |
font, | |
font_size: 60.0, | |
color: Color::WHITE, | |
}; | |
let text_alignment = TextAlignment { | |
vertical: VerticalAlign::Center, | |
horizontal: HorizontalAlign::Center, | |
}; | |
// 2d camera | |
commands.spawn_bundle(OrthographicCameraBundle::new_2d()); | |
// Demonstrate changing translation | |
commands | |
.spawn_bundle(Text2dBundle { | |
text: Text::with_section("translation", text_style.clone(), text_alignment), | |
..Default::default() | |
}) | |
.insert(AnimateTranslation); | |
// Demonstrate changing rotation | |
commands | |
.spawn_bundle(Text2dBundle { | |
text: Text::with_section("rotation", text_style.clone(), text_alignment), | |
..Default::default() | |
}) | |
.insert(AnimateRotation); | |
// Demonstrate changing scale | |
commands | |
.spawn_bundle(Text2dBundle { | |
text: Text::with_section("scale", text_style, text_alignment), | |
..Default::default() | |
}) | |
.insert(AnimateScale); | |
} | |
fn animate_translation( | |
time: Res<Time>, | |
mut query: Query<&mut Transform, (With<Text>, With<AnimateTranslation>)>, | |
) { | |
for mut transform in query.iter_mut() { | |
transform.translation.x = 100.0 * time.seconds_since_startup().sin() as f32 - 400.0; | |
transform.translation.y = 100.0 * time.seconds_since_startup().cos() as f32; | |
} | |
} | |
fn animate_rotation( | |
time: Res<Time>, | |
mut query: Query<&mut Transform, (With<Text>, With<AnimateRotation>)>, | |
) { | |
for mut transform in query.iter_mut() { | |
transform.rotation = Quat::from_rotation_z(time.seconds_since_startup().cos() as f32); | |
} | |
} | |
fn animate_scale( | |
time: Res<Time>, | |
mut query: Query<&mut Transform, (With<Text>, With<AnimateScale>)>, | |
) { | |
// Consider changing font-size instead of scaling the transform. Scaling a Text2D will scale the | |
// rendered quad, resulting in a pixellated look. | |
for mut transform in query.iter_mut() { | |
transform.translation = Vec3::new(400.0, 0.0, 0.0); | |
transform.scale = Vec3::splat((time.seconds_since_startup().sin() as f32 + 1.1) * 2.0); | |
} | |
} |
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