Minor tidying in font_atlas_debug (#17825)

# Objective Tidy up a few little things I noticed while working with this example ## Solution - Fix manual resetting of a repeating timer - Use atlas image size instead of hardcoded value. Atlases are always 512x512 right now, but hopefully not in the future. - Pluralize a variable name for a variable holding a `Vec`

Author: rparrett

examples/ui/font_atlas_debug.rs

@@ -39,21 +39,23 @@ fn atlas_render_system(
  mut commands: Commands,
  mut state: ResMut<State>,
  font_atlas_sets: Res<FontAtlasSets>,
+ images: Res<Assets<Image>>,
 ) {
  if let Some(set) = font_atlas_sets.get(&state.handle) {
- if let Some((_size, font_atlas)) = set.iter().next() {
+ if let Some((_size, font_atlases)) = set.iter().next() {
  let x_offset = state.atlas_count as f32;
- if state.atlas_count == font_atlas.len() as u32 {
+ if state.atlas_count == font_atlases.len() as u32 {
  return;
  }
- let font_atlas = &font_atlas[state.atlas_count as usize];
+ let font_atlas = &font_atlases[state.atlas_count as usize];
+ let image = images.get(&font_atlas.texture).unwrap();
  state.atlas_count += 1;
  commands.spawn((
  ImageNode::new(font_atlas.texture.clone()),
  Node {
  position_type: PositionType::Absolute,
  top: Val::ZERO,
- left: Val::Px(512.0 * x_offset),
+ left: Val::Px(image.width() as f32 * x_offset),
  ..default()
  },
  ));
@@ -67,16 +69,16 @@ fn text_update_system(
  mut query: Query<&mut Text>,
  mut seeded_rng: ResMut<SeededRng>,
 ) {
- if state.timer.tick(time.delta()).finished() {
- for mut text in &mut query {
- let c = seeded_rng.gen::<u8>() as char;
- let string = &mut **text;
- if !string.contains(c) {
- string.push(c);
- }
- }
+ if !state.timer.tick(time.delta()).just_finished() {
+ return;
+ }
 
- state.timer.reset();
+ for mut text in &mut query {
+ let c = seeded_rng.gen::<u8>() as char;
+ let string = &mut **text;
+ if !string.contains(c) {
+ string.push(c);
+ }
  }
 }