add example

Cargo.lock

@@ -1781,6 +1781,15 @@ version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2db585e1d738fc771bf08a151420d3ed193d9d895a36df7f6f8a9456b911ddc"
 
+[[package]]
+name = "legend_sort"
+version = "0.1.0"
+dependencies = [
+ "eframe",
+ "egui_plot",
+ "env_logger",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.167"

examples/legend_sort/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "legend_sort"
+version = "0.1.0"
+authors = ["hacknus <[email protected]>"]
+license = "MIT OR Apache-2.0"
+edition = "2021"
+rust-version = "1.80"
+publish = false
+
+[lints]
+workspace = true
+
+[dependencies]
+eframe = { workspace = true, features = ["default"] }
+egui_plot.workspace = true
+env_logger = { workspace = true, default-features = false, features = [
+    "auto-color",
+    "humantime",
+] }

examples/legend_sort/README.md

@@ -0,0 +1,5 @@
+This example shows how to sort the legend entries.
+
+```sh
+cargo run -p legend_sort
+```

examples/legend_sort/src/main.rs

@@ -0,0 +1,58 @@
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+#![allow(rustdoc::missing_crate_level_docs)] // it's an example
+
+use eframe::egui;
+use egui_plot::{Legend, Line, Plot, PlotPoints};
+
+fn main() -> eframe::Result {
+    env_logger::init(); // Log to stderr (if you run with `RUST_LOG=debug`).
+
+    let options = eframe::NativeOptions {
+        viewport: egui::ViewportBuilder::default().with_inner_size([350.0, 200.0]),
+        ..Default::default()
+    };
+    let graph: Vec<[f64; 2]> = vec![[0.0, 1.0], [2.0, 3.0], [3.0, 2.0]];
+    let graph2: Vec<[f64; 2]> = vec![[0.0, 2.0], [2.0, 4.0], [3.0, 3.0]];
+    let graph3: Vec<[f64; 2]> = vec![[0.0, 3.0], [2.0, 5.0], [3.0, 4.0]];
+
+    eframe::run_native(
+        "My egui App with a plot",
+        options,
+        Box::new(|_cc| {
+            Ok(Box::new(MyApp {
+                insert_order: false,
+                graph,
+                graph2,
+                graph3,
+            }))
+        }),
+    )
+}
+
+#[derive(Default)]
+struct MyApp {
+    insert_order: bool,
+    graph: Vec<[f64; 2]>,
+    graph2: Vec<[f64; 2]>,
+    graph3: Vec<[f64; 2]>,
+}
+
+impl eframe::App for MyApp {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.label("If checked the legend will follow the order as the curves are inserted");
+            ui.checkbox(&mut self.insert_order, "Insert order");
+
+            Plot::new("My Plot")
+                .legend(Legend::default().follow_insertion_order(self.insert_order))
+                .show(ui, |plot_ui| {
+                    plot_ui
+                        .line(Line::new(PlotPoints::from(self.graph3.clone())).name("3rd Curve"));
+                    plot_ui.line(Line::new(PlotPoints::from(self.graph.clone())).name("1st Curve"));
+                    plot_ui
+                        .line(Line::new(PlotPoints::from(self.graph2.clone())).name("2nd Curve"));
+                });
+            // Remember the position of the plot
+        });
+    }
+}