Appearance
Count nodes and edges
This example shows how to get the number of nodes and edges in the graph using the getNodes and getEdges methods.
ts
import Ogma from '@linkurious/ogma';
const ogma = new Ogma({
container: 'graph-container'
});
// Generate a random graph
ogma.generate
.random({
nodes: 7,
edges: 10
})
// Assign the graph to Ogma.
.then(g => ogma.setGraph(g))
.then(() => ogma.layouts.force({ locate: true, duration: 0 }))
.then(() => {
// Retrieve the number of nodes and edges.
const nodes = ogma.getNodes();
const edges = ogma.getEdges();
// Update the html code.
document.getElementById('info_nodes')!.textContent = 'Nodes: ' + nodes.size;
document.getElementById('info_edges')!.textContent = 'Edges: ' + edges.size;
});
html
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<link type="text/css" rel="stylesheet" href="styles.css" />
</head>
<body>
<div id="graph-container"></div>
<div id="info_nodes" class="info n"></div>
<div id="info_edges" class="info e"></div>
<script type="module" src="index.ts"></script>
</body>
</html>
css
#graph-container {
top: 0;
bottom: 0;
left: 0;
right: 0;
position: absolute;
margin: 0;
overflow: hidden;
}
.info {
position: absolute;
color: #fff;
background: #141229;
font-size: 20px;
font-family: monospace;
padding: 8px;
}
.info.n {
top: 5px;
right: 15px;
}
.info.e {
top: 45px;
right: 15px;
}