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PNG export with geo map and vector-layers
This example shows how to export the visualisation as a PNG file. When using geo mode, the tiles and layers are exported as well.
ts
import Ogma from '@linkurious/ogma';
import L from 'leaflet';
const graph = {
nodes: [
{
id: 'Paris',
data: { latitude: 48.858838, longitude: 2.343436 },
attributes: { x: 0, y: 0, text: 'Paris', radius: 10 }
},
{
id: 'London',
data: { latitude: 51.509615, longitude: -0.134514 },
attributes: { x: 100, y: 0, text: 'London', radius: 10 }
}
],
edges: [
{
id: 'Eurostar',
source: 'Paris',
target: 'London',
attributes: { width: 5, text: 'Eurostar' }
}
]
};
const ogma = new Ogma({
graph,
container: 'graph-container'
});
await ogma.geo.enable({
attribution:
'Map data © <a target="_blank" href="http://osm.org/copyright">OpenStreetMap contributors</a>'
});
const jsonString = await fetch('files/eu-shapes.geojson').then(response =>
response.text()
);
const geojson = JSON.parse(jsonString);
geojson.features = geojson.features.filter(
(_, i: number) => i === 7 || i === 13
);
const map = ogma.geo.getMap()!;
map.addLayer(L.geoJSON(geojson));
map.addLayer(new L.Marker([49.93890274394121, -1.666402816772461]));
await ogma.view.afterNextFrame();
const dataURL = await ogma.export.png({
download: false,
clip: true,
textWatermark: {
content: 'image',
repeat: true,
angle: 45
}
});
// Preview image
if (dataURL) {
const img = document.createElement('img');
img.src = dataURL;
document.body.appendChild(img);
}
html
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/leaflet@1.9.0/dist/leaflet.min.css"
/>
<link type="text/css" rel="stylesheet" href="styles.css" />
</head>
<body>
<div id="graph-container"></div>
<hr />
<span class="arrow">↓</span>
<br />
<script type="module" src="index.ts"></script>
</body>
</html>
css
body {
margin: 0;
padding: 0;
font-family: Helvetica, Arial, sans-serif;
text-align: center;
}
#graph-container {
height: 300px;
position: relative;
}
img {
height: 300px;
}
.arrow {
margin-top: -1.5em;
display: inline-block;
position: absolute;
padding: 0.5em;
background: white;
}