RustGrapher

A library to simulate and visualize a 2D force directed graph in rust.

Features

• Render PetGraphs in 2D
• Physics based positioning via a Force Directed Graph
• Drag Nodes to a new position
• Place new nodes
• WIP: Build graphs using the UI

Algorithms

Barnes–Hut

Barnes-Hut is a approximation algorithm for n-body simulation.

The force directed graph calculates for each node the repulsive force to other nodes which will lead to a complexity of $O(n^2)$.

Using a k-d Tree(Quadtree) the Barnes-Hut algorithm groups far away nodes and only calculates the repulsive force once.This results in a complexity of $O(nlogn)$.

Performance

[!TIP] Run the project with --release for the best performance(~10x).

On a Ryzen 7 3700X the library can calculate 2000 simulation steps per second at 1000 Nodes. (Using 16 Physics threads)

Controls

• return - Centers the camera on the average poisson of all nodes.
• space - Start/Pause simulation
• scroll wheel - Zoom in or out
• W, A, S and D - to move the camera
• Click and drag - move nodes
• P - switch from drag to node place(only works while simulation is paused)

Usage

    // Build a PetGraph
    let mut rng = rand::thread_rng();
    let graph: petgraph::Graph<(), (), Directed> =
        petgraph_gen::barabasi_albert_graph(&mut rng, 1000, 1, None);

    // Configure the simulator
    let simulator = SimulatorBuilder::new()
        .delta_time(0.01)
        .freeze_threshold(-1.0)
        .build(graph.into());

    // Start the renderer
    let renderer = Renderer::new(simulator);
    renderer.create_window();

Examples

• Basic Barabasi Albert Graph
• Section of Wikipedia Graph
• Headless Graph