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The dagre npm package is a JavaScript library that provides facilities for graph layout. It is particularly useful for arranging nodes and edges in a directed graph, ensuring that the layout is visually appealing and easy to understand. Dagre uses a combination of algorithms to position nodes and edges in a way that minimizes edge crossings and distributes nodes evenly.
Graph Creation
This feature allows you to create a new graph, add nodes, and define edges between them. The code sample demonstrates how to initialize a graph, set default properties, and add nodes and edges.
const dagre = require('dagre');
const g = new dagre.graphlib.Graph();
g.setGraph({});
g.setDefaultEdgeLabel(() => ({}));
g.setNode('a', { label: 'Node A', width: 50, height: 50 });
g.setNode('b', { label: 'Node B', width: 50, height: 50 });
g.setEdge('a', 'b');
Graph Layout
This feature performs the layout of the graph, positioning the nodes and edges in a visually appealing manner. The code sample shows how to apply the layout algorithm to the graph and retrieve the computed positions of the nodes.
const dagre = require('dagre');
const g = new dagre.graphlib.Graph();
g.setGraph({});
g.setDefaultEdgeLabel(() => ({}));
g.setNode('a', { label: 'Node A', width: 50, height: 50 });
g.setNode('b', { label: 'Node B', width: 50, height: 50 });
g.setEdge('a', 'b');
dagre.layout(g);
console.log(g.node('a')); // { label: 'Node A', width: 50, height: 50, x: 50, y: 50 }
console.log(g.node('b')); // { label: 'Node B', width: 50, height: 50, x: 150, y: 50 }
Cytoscape is a graph theory library for visualizing and analyzing network data. It provides a wide range of layout algorithms and is highly customizable. Compared to dagre, Cytoscape offers more advanced features for interactive graph visualization and analysis.
d3-force is a module of the D3.js library that provides force-directed graph layout algorithms. It is highly flexible and can be used to create dynamic, interactive visualizations. While dagre focuses on directed graphs, d3-force is more general-purpose and can handle various types of graph layouts.
ELK (Eclipse Layout Kernel) is a layout engine for graph visualization. The elkjs package is a JavaScript port of ELK. It offers a variety of layout algorithms and is known for its high-quality layouts. Compared to dagre, ELK provides more options and fine-tuning capabilities for complex graph layouts.
Dagre is a JavaScript library that makes it easy to lay out directed graphs on the client-side.
For more details, including examples and configuration options, please see our wiki.
dagre is licensed under the terms of the MIT License. See the LICENSE file for details.
FAQs
Graph layout for JavaScript
The npm package dagre receives a total of 353,696 weekly downloads. As such, dagre popularity was classified as popular.
We found that dagre demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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