egui_graphs

Graph visualization with rust, petgraph and egui in its DNA.

This project represents a Widget implementation for egui framework. It allows effortless interactive graph visualization with rust.

Features

• Minimap;
• Layouts (first one will be force-directed layout using fdg-sim like in configurable demo);

--- release v1.0.0 ---

• Display node labels;
• Node folding;
• Arbitrarily complex graphs with self-references, multiple edges, loops, etc.;
• Zoom & pan;
• Dragging, Selecting;
• Graph elements style configuration;
• Support for egui dark/light mode;
• Selection depth;
• Changes reporting;

Status

The project is on the track to v1.0.0 and there will be some releases prior.

Now I am working on demo project for a wikipedia article connections demonstration. This project serves several goals:

• usage demonstration of the widget;
• demonstration of web-assembly compatibility;
• find and polish final pre-release issues;
• increase discoverability of the project.

Docs

Docs can be found here

Examples

Basic setup example

Step 1: Setting up the BasicApp struct.

First, let's define the BasicApp struct that will hold the graph.

pub struct BasicApp {
    g: Graph<(), ()>,
}

Step 2: Implementing the new() function.

Next, implement the new() function for the BasicApp struct.

impl BasicApp {
    fn new(_: &CreationContext<'_>) -> Self {
        let g = generate_graph();
        Self { g }
    }
}

Step 3: Generating the graph.

Create a helper function called generate_graph(). In this example, we create three nodes with and three edges connecting them in a triangular pattern.

fn generate_graph() -> Graph<(), ()> {
    let mut g: Graph<(), ()> = StableGraph::new();

    let a = g.add_node(Node::new(egui::Vec2::new(0., SIDE_SIZE), ()));
    let b = g.add_node(Node::new(egui::Vec2::new(-SIDE_SIZE, 0.), ()));
    let c = g.add_node(Node::new(egui::Vec2::new(SIDE_SIZE, 0.), ()));

    g.add_edge(a, b, Edge::new(()));
    g.add_edge(b, c, Edge::new(()));
    g.add_edge(c, a, Edge::new(()));

    g
}

Step 4: Implementing the update() function.

Now, lets implement the update() function for the BasicApp. This function creates a GraphView widget providing a mutable reference to the graph, and adds it to egui::CentralPanel using the ui.add() function for adding widgets.

impl App for BasicApp {
    fn update(&mut self, ctx: &Context, _: &mut eframe::Frame) {
        egui::CentralPanel::default().show(ctx, |ui| {
            ui.add(&mut GraphView::new(&mut self.g));
        });
    }
}

Step 5: Running the application.

Finally, run the application using the run_native() function with the specified native options and the BasicApp.

fn main() {
    let native_options = eframe::NativeOptions::default();
    run_native(
        "egui_graphs_basic_demo",
        native_options,
        Box::new(|cc| Box::new(BasicApp::new(cc))),
    )
    .unwrap();
}

You can further customize the appearance and behavior of your graph by modifying the settings or adding more nodes and edges as needed.

Interactivity

It is easy to add interactivity to the visualization. Just use SettingsNavigation and SettingsInteraction with constructor methods. You can also check basic interactive demo and comprehensive configurable demo for usage references and settings description.

Gallery