saving my place; cool but slow text effect

bin/text-inspect.rs

@@ -1,4 +1,4 @@
-use bevy::prelude::*;
+use bevy::{diagnostic::FrameTimeDiagnosticsPlugin, prelude::*};
 
 const LOREM: [&str; 5] = [
     "Ullam nostrum aut amet adipisci consequuntur quisquam nemo consequatur. Vel eum et ullam ullam aperiam earum voluptas consequuntur. Blanditiis earum voluptatem voluptas animi dolorum fuga aliquam ea.\n",
@@ -12,7 +12,7 @@ fn main() {
     App::new()
         .add_plugins(DefaultPlugins.set(WindowPlugin {
             primary_window: Some(Window {
-                title: "Text WTF".into(),
+                title: "Text Inspect".into(),
                 resolution: (640., 480.).into(),
                 ..default()
             }),
@@ -23,6 +23,8 @@ fn main() {
         .add_system(manage_buttons)
         .add_system(update)
         .add_system(mouse_cursor)
+        .add_system(play)
+        .add_system(framerate)
         .run();
 }
 
@@ -86,19 +88,24 @@ fn init_ui(mut commands: Commands) {
                 ButtonShelf,
             ));
 
-            {
-                parent.spawn((
-                    TextBundle::from_sections(LOREM.iter().map(|&section| TextSection {
-                        value: section.into(),
-                        style: TextStyle {
-                            font_size: 50.0,
-                            ..default()
-                        },
-                    })),
-                    Marker,
-                    PreviewText,
-                ));
-            }
+            parent.spawn((
+                TextBundle::from_sections(LOREM.iter().map(|&section| TextSection {
+                    value: section.into(),
+                    style: TextStyle {
+                        font_size: 50.0,
+                        ..default()
+                    },
+                }))
+                .with_style(Style {
+                    max_size: Size {
+                        width: Val::Px(500.),
+                        height: Val::Undefined,
+                    },
+                    ..default()
+                }),
+                Marker,
+                PreviewText,
+            ));
         });
 }
 
@@ -166,13 +173,15 @@ fn update(
         match (i, f) {
             (Interaction::Clicked, FontButton(font)) => {
                 let mut text = texts.single_mut();
-                *text = Text::from_sections(LOREM.iter().map(|&s| TextSection {
-                    value: s.into(),
-                    style: TextStyle {
-                        font: font.clone(),
-                        font_size: 50.0,
-                        ..default()
-                    },
+                *text = Text::from_sections(LOREM.iter().flat_map(|&l| {
+                    l.chars().map(|c| TextSection {
+                        value: c.into(),
+                        style: TextStyle {
+                            font: font.clone(),
+                            font_size: 50.0,
+                            ..default()
+                        },
+                    })
                 }));
             }
             _ => (),
@@ -193,3 +202,39 @@ fn mouse_cursor(
         }
     }
 }
+
+fn play(
+    mut texts: Query<&mut Text, (With<Marker>, With<PreviewText>)>,
+    interactions: Query<&Interaction, (Changed<Interaction>, With<FontButton>)>,
+    mut playing: Local<bool>,
+    time: Res<Time>,
+    mut desired: Local<String>,
+) {
+    for interaction in interactions.iter() {
+        match interaction {
+            Interaction::Clicked => *playing = true,
+            _ => (),
+        }
+    }
+    if *playing {
+        let mut text = texts.single_mut();
+        let total_sections = text.sections.len();
+
+        let curr_cos = time.elapsed().as_secs_f32().cos().abs();
+
+        for (idx, section) in text.sections.iter_mut().enumerate() {
+            let idx_ratio = (total_sections as f32) / ((idx + 1) as f32);
+
+            let intensity = (curr_cos - idx_ratio).abs() % 1.0;
+
+            section.style.color.set_a(intensity);
+        }
+        // Get text sections
+        //
+        // figure out how far into animation we are
+        //
+        // Set current vs desired ratio
+        //
+        // Set current to that % from empty to desired
+    }
+}