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create-map-svg
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import { geoPath, geoIdentity } from 'd3' | |
import { writeFile } from 'node:fs/promises' | |
import { stat } from 'node:fs' | |
const geojsonUrl = 'https://assets.codepen.io/85648/map-example.json' | |
const dimensions = { | |
width: 600, | |
height: 300, | |
} | |
fetch(geojsonUrl) | |
.then((response) => response.json()) | |
.then(async (data) => { | |
try { | |
console.log('✨Generating SVG') | |
const { width, height } = dimensions | |
const projection = geoIdentity() | |
.reflectY(true) // SVG co-ordinate system is the opposite way up, so we need to flip it | |
.fitSize([dimensions.width, dimensions.height], data) // Scale to fit our SVG dimensions | |
const path = geoPath(projection) | |
const paths = data.features.map((d) => { | |
return `<path id="${d.properties.name}" d="${path(d)}" />` | |
}) | |
const fileData = `<svg xmlns="http://www.w3.org/2000/svg" width="${width}" height="${height}" viewBox="0 0 ${width} ${height}"> | |
${paths.join('')} | |
</svg>` | |
await writeFile('./src/map-svg.svg', fileData) | |
/* Output the file size, for info */ | |
stat(outputPath, (err, stats) => { | |
console.log( | |
'Done!', | |
`Size ${parseFloat(stats.size / BYTES_PER_MB).toFixed(2)}MB` | |
) | |
}) | |
} catch (error) { | |
console.error('Error writing file') | |
} | |
}) |
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