Misc code cleanup, docs fixes, etc

docs/index.html

@@ -128,20 +128,20 @@
             .catch(on_wasm_error);
 
         function on_wasm_loaded() {
-            console.debug("wasm loaded. starting egui app…");
+            console.debug("wasm loaded. starting app…");
 
             // This call installs a bunch of callbacks and then returns:
             wasm_bindgen.start("the_canvas_id");
 
-            console.debug("egui app started.");
+            console.debug("app started.");
             document.getElementById("center_text").remove();
         }
 
         function on_wasm_error(error) {
-            console.error("Failed to start egui: " + error);
+            console.error("Failed to start: " + error);
             document.getElementById("center_text").innerHTML = `
                 <p>
-                    An error occurred loading egui
+                    An error occurred during loading:
                 </p>
                 <p style="font-family:Courier New">
                     ${error}

eframe/examples/hello_world.rs

@@ -22,19 +22,17 @@ impl epi::App for MyApp {
     }
 
     fn update(&mut self, ctx: &egui::Context, frame: &epi::Frame) {
-        let Self { name, age } = self;
-
         egui::CentralPanel::default().show(ctx, |ui| {
             ui.heading("My egui Application");
             ui.horizontal(|ui| {
                 ui.label("Your name: ");
-                ui.text_edit_singleline(name);
+                ui.text_edit_singleline(&mut self.name);
             });
-            ui.add(egui::Slider::new(age, 0..=120).text("age"));
+            ui.add(egui::Slider::new(&mut self.age, 0..=120).text("age"));
             if ui.button("Click each year").clicked() {
-                *age += 1;
+                self.age += 1;
             }
-            ui.label(format!("Hello '{}', age {}", name, age));
+            ui.label(format!("Hello '{}', age {}", self.name, self.age));
         });
 
         // Resize the native window to be just the size we need it to be:

egui/Cargo.toml

@@ -2,7 +2,7 @@
 name = "egui"
 version = "0.16.1"
 authors = ["Emil Ernerfeldt <emil.ernerfeldt@gmail.com>"]
-description = "Simple, portable immediate mode GUI library for Rust"
+description = "An easy-to-use immediate mode GUI that runs on both web and native"
 edition = "2021"
 rust-version = "1.56"
 homepage = "https://github.com/emilk/egui"

egui/src/containers/panel.rs

@@ -9,6 +9,8 @@
 //! The order in which you add panels matter!
 //! The first panel you add will always be the outermost, and the last you add will always be the innermost.
 //!
+//! You must never open one top-level panel from within another panel. Add one panel, then the next.
+//!
 //! Always add any [`CentralPanel`] last.
 //!
 //! Add your [`Window`]:s after any top-level panels.

egui/src/data/input.rs

@@ -165,18 +165,27 @@ pub enum Event {
     ///
     /// When the user presses enter/return, do not send a `Text` (just [`Key::Enter`]).
     Text(String),
+    /// A key was pressed or released.
     Key {
         key: Key,
+        /// Was it pressed or released?
         pressed: bool,
+        /// The state of the modifier keys at the time of the event.
         modifiers: Modifiers,
     },
 
+    /// The mouse or touch moved to a new place.
     PointerMoved(Pos2),
+
+    /// A mouse button was pressed or released (or a touch started or stopped).
     PointerButton {
+        /// Where is the pointer?
         pos: Pos2,
+        /// What mouse button? For touches, use [`PointerButton::Primary`].
         button: PointerButton,
+        /// Was it the button/touch pressed this frame, or released?
         pressed: bool,
-        /// The state of the modifier keys at the time of the event
+        /// The state of the modifier keys at the time of the event.
         modifiers: Modifiers,
     },
     /// The mouse left the screen, or the last/primary touch input disappeared.
@@ -217,6 +226,7 @@ pub enum Event {
         /// Unique identifier of a finger/pen. Value is stable from touch down
         /// to lift-up
         id: TouchId,
+        /// One of: start move end cancel.
         phase: TouchPhase,
         /// Position of the touch (or where the touch was last detected)
         pos: Pos2,

egui/src/introspection.rs

@@ -146,7 +146,7 @@ impl Widget for &mut epaint::TessellationOptions {
                 epsilon: _,
             } = self;
             ui.checkbox(anti_alias, "Antialias")
-                .on_hover_text("Turn off for small performance gain.");
+                .on_hover_text("Apply feathering to smooth out the edges of shapes. Turn off for small performance gain.");
             ui.add(
                 crate::widgets::Slider::new(bezier_tolerance, 0.0001..=10.0)
                     .logarithmic(true)

egui/src/layers.rs

@@ -23,6 +23,7 @@ pub enum Order {
     /// Debug layer, always painted last / on top
     Debug,
 }
+
 impl Order {
     const COUNT: usize = 6;
     const ALL: [Order; Self::COUNT] = [

egui/src/response.rs

@@ -447,7 +447,7 @@ impl Response {
     ///
     /// If `align` is `None`, it'll scroll enough to bring the UI into view.
     ///
-    /// See also: [`Ui::scroll_to_cursor`], [`Ui::scroll_to`].
+    /// See also: [`Ui::scroll_to_cursor`], [`Ui::scroll_to_rect`].
     ///
     /// ```
     /// # egui::__run_test_ui(|ui| {

egui/src/ui.rs

@@ -908,7 +908,7 @@ impl Ui {
     ///
     /// If `align` is `None`, it'll scroll enough to bring the cursor into view.
     ///
-    /// See also: [`Response::scroll_to_me`], [`Ui::scroll_to`].
+    /// See also: [`Response::scroll_to_me`], [`Ui::scroll_to_rect`].
     ///
     /// ```
     /// # use egui::Align;
@@ -933,7 +933,7 @@ impl Ui {
     ///
     /// If `align` is not provided, it'll scroll enough to bring the cursor into view.
     ///
-    /// See also: [`Response::scroll_to_me`], [`Ui::scroll_to`].
+    /// See also: [`Response::scroll_to_me`], [`Ui::scroll_to_rect`].
     ///
     /// ```
     /// # use egui::Align;

egui/src/widgets/plot/items/mod.rs

@@ -613,6 +613,7 @@ impl PlotItem for Polygon {
 }
 
 /// Text inside the plot.
+#[derive(Clone)]
 pub struct Text {
     pub(super) text: WidgetText,
     pub(super) position: Value,
@@ -1079,6 +1080,7 @@ impl PlotItem for Arrows {
 }
 
 /// An image in the plot.
+#[derive(Clone)]
 pub struct PlotImage {
     pub(super) position: Value,
     pub(super) texture_id: TextureId,

egui_web/README.md

@@ -24,6 +24,6 @@ Check out [eframe_template](https://github.com/emilk/eframe_template) for an exa
 * No integration with browser settings for colors and fonts.
 * On Linux and Mac, Firefox will copy the WebGL render target from GPU, to CPU and then back again (https://bugzilla.mozilla.org/show_bug.cgi?id=1010527#c0), slowing down egui.
 
-The suggested use for `egui_web` is for experiments, personal projects and web games. Using egui for a serious web page is probably a bad idea.
-
 In many ways, `egui_web` is trying to make the browser do something it wasn't designed to do (though there are many things browser vendors could do to improve how well libraries like egui work).
+
+The suggested use for `egui_web` are for web apps where performance and responsiveness are more important than accessability and mobile text editing.

epaint/src/shape.rs

@@ -31,6 +31,20 @@ pub enum Shape {
     CubicBezier(CubicBezierShape),
 }
 
+impl From<Vec<Shape>> for Shape {
+    #[inline(always)]
+    fn from(shapes: Vec<Shape>) -> Self {
+        Self::Vec(shapes)
+    }
+}
+
+impl From<Mesh> for Shape {
+    #[inline(always)]
+    fn from(mesh: Mesh) -> Self {
+        Self::Mesh(mesh)
+    }
+}
+
 /// ## Constructors
 impl Shape {
     /// A line between two points.
@@ -59,25 +73,25 @@ impl Shape {
 
     /// Turn a line into equally spaced dots.
     pub fn dotted_line(
-        points: &[Pos2],
+        path: &[Pos2],
         color: impl Into<Color32>,
         spacing: f32,
         radius: f32,
     ) -> Vec<Self> {
         let mut shapes = Vec::new();
-        points_from_line(points, spacing, radius, color.into(), &mut shapes);
+        points_from_line(path, spacing, radius, color.into(), &mut shapes);
         shapes
     }
 
     /// Turn a line into dashes.
     pub fn dashed_line(
-        points: &[Pos2],
+        path: &[Pos2],
         stroke: impl Into<Stroke>,
         dash_length: f32,
         gap_length: f32,
     ) -> Vec<Self> {
         let mut shapes = Vec::new();
-        dashes_from_line(points, stroke.into(), dash_length, gap_length, &mut shapes);
+        dashes_from_line(path, stroke.into(), dash_length, gap_length, &mut shapes);
         shapes
     }
 
@@ -495,16 +509,15 @@ impl From<TextShape> for Shape {
 
 /// Creates equally spaced filled circles from a line.
 fn points_from_line(
-    line: &[Pos2],
+    path: &[Pos2],
     spacing: f32,
     radius: f32,
     color: Color32,
     shapes: &mut Vec<Shape>,
 ) {
     let mut position_on_segment = 0.0;
-    line.windows(2).for_each(|window| {
+    path.windows(2).for_each(|window| {
-        let start = window[0];
+        let (start, end) = (window[0], window[1]);
-        let end = window[1];
         let vector = end - start;
         let segment_length = vector.length();
         while position_on_segment < segment_length {
@@ -518,7 +531,7 @@ fn points_from_line(
 
 /// Creates dashes from a line.
 fn dashes_from_line(
-    line: &[Pos2],
+    path: &[Pos2],
     stroke: Stroke,
     dash_length: f32,
     gap_length: f32,
@@ -526,9 +539,8 @@ fn dashes_from_line(
 ) {
     let mut position_on_segment = 0.0;
     let mut drawing_dash = false;
-    line.windows(2).for_each(|window| {
+    path.windows(2).for_each(|window| {
-        let start = window[0];
+        let (start, end) = (window[0], window[1]);
-        let end = window[1];
         let vector = end - start;
         let segment_length = vector.length();
 

epaint/src/text/fonts.rs

@@ -160,15 +160,15 @@ pub struct FontTweak {
 
     /// Shift font downwards by this fraction of the font size (in points).
     ///
-    /// A positive value shifts the text upwards.
+    /// A positive value shifts the text downwards.
-    /// A negative value shifts it downwards.
+    /// A negative value shifts it upwards.
     ///
     /// Example value: `-0.2`.
     pub y_offset_factor: f32,
 
     /// Shift font downwards by this amount of logical points.
     ///
-    /// Example value: `-1.0`.
+    /// Example value: `2.0`.
     pub y_offset: f32,
 }
 

epi/src/lib.rs

@@ -372,27 +372,27 @@ pub struct WebInfo {
 pub struct Location {
     /// The full URL (`location.href`) without the hash.
     ///
-    /// Example: "http://www.example.com:80/index.html?foo=bar".
+    /// Example: `"http://www.example.com:80/index.html?foo=bar"`.
     pub url: String,
 
     /// `location.protocol`
     ///
-    /// Example: "http:".
+    /// Example: `"http:"`.
     pub protocol: String,
 
     /// `location.host`
     ///
-    /// Example: "example.com:80".
+    /// Example: `"example.com:80"`.
     pub host: String,
 
     /// `location.hostname`
     ///
-    /// Example: "example.com".
+    /// Example: `"example.com"`.
     pub hostname: String,
 
     /// `location.port`
     ///
-    /// Example: "80".
+    /// Example: `"80"`.
     pub port: String,
 
     /// The "#fragment" part of "www.example.com/index.html?query#fragment".
@@ -415,7 +415,7 @@ pub struct Location {
 
     /// `location.origin`
     ///
-    /// Example: "http://www.example.com:80"
+    /// Example: `"http://www.example.com:80"`.
     pub origin: String,
 }
 

sh/check.sh

@@ -52,6 +52,7 @@ cargo doc --document-private-items --no-deps --all-features
 
 # For finding bloat:
 # cargo bloat --release --bin demo_glium -n 200 | rg egui
+# Also try https://github.com/google/bloaty
 
 # what compiles slowly?
 # https://fasterthanli.me/articles/why-is-my-rust-build-so-slow