mirror of
https://github.com/bevyengine/bevy
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6f7d0e5725
# Objective
Currently text is recomputed unnecessarily on any changes to its color,
which is extremely expensive.
## Solution
Split up `TextStyle` into two separate components `TextFont` and
`TextColor`.
## Testing
I added this system to `many_buttons`:
```rust
fn set_text_colors_changed(mut colors: Query<&mut TextColor>) {
for mut text_color in colors.iter_mut() {
text_color.set_changed();
}
}
```
reports ~4fps on main, ~50fps with this PR.
## Migration Guide
`TextStyle` has been renamed to `TextFont` and its `color` field has
been moved to a separate component named `TextColor` which newtypes
`Color`.
85 lines
2.6 KiB
Rust
85 lines
2.6 KiB
Rust
//! Showcase how to use and configure FPS overlay.
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use bevy::{
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dev_tools::fps_overlay::{FpsOverlayConfig, FpsOverlayPlugin},
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prelude::*,
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text::FontSmoothing,
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};
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struct OverlayColor;
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impl OverlayColor {
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const RED: Color = Color::srgb(1.0, 0.0, 0.0);
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const GREEN: Color = Color::srgb(0.0, 1.0, 0.0);
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}
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fn main() {
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App::new()
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.add_plugins((
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DefaultPlugins,
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FpsOverlayPlugin {
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config: FpsOverlayConfig {
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text_config: TextFont {
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// Here we define size of our overlay
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font_size: 42.0,
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// If we want, we can use a custom font
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font: default(),
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// We could also disable font smoothing,
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font_smoothing: FontSmoothing::default(),
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},
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// We can also change color of the overlay
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text_color: OverlayColor::GREEN,
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enabled: true,
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},
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},
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))
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.add_systems(Startup, setup)
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.add_systems(Update, customize_config)
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.run();
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}
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fn setup(mut commands: Commands) {
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// We need to spawn a camera (2d or 3d) to see the overlay
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commands.spawn(Camera2d);
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// Instruction text
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commands
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.spawn(NodeBundle {
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style: Style {
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width: Val::Percent(100.0),
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height: Val::Percent(100.0),
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align_items: AlignItems::Center,
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justify_content: JustifyContent::Center,
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..default()
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},
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..default()
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})
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.with_children(|c| {
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c.spawn(Text::new(concat!(
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"Press 1 to toggle the overlay color.\n",
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"Press 2 to decrease the overlay size.\n",
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"Press 3 to increase the overlay size.\n",
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"Press 4 to toggle the overlay visibility."
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)));
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});
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}
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fn customize_config(input: Res<ButtonInput<KeyCode>>, mut overlay: ResMut<FpsOverlayConfig>) {
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if input.just_pressed(KeyCode::Digit1) {
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// Changing resource will affect overlay
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if overlay.text_color == OverlayColor::GREEN {
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overlay.text_color = OverlayColor::RED;
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} else {
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overlay.text_color = OverlayColor::GREEN;
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}
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}
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if input.just_pressed(KeyCode::Digit2) {
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overlay.text_config.font_size -= 2.0;
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}
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if input.just_pressed(KeyCode::Digit3) {
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overlay.text_config.font_size += 2.0;
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}
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if input.just_pressed(KeyCode::Digit4) {
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overlay.enabled = !overlay.enabled;
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}
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}
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