ferment/lib/svg-overview.js

Peer-to-peer audio publishing and streaming application. Like SoundCloud but decentralized. A mashup of ssb, webtorrent and electron.

module.exports = function (data, width, height) {
  var bins = typeof data === 'string' ? Array.from(new Buffer(data, 'base64')) : []
  var barWidth = width / bins.length
  var multiplier = 256 / bins.reduce((x, y) => Math.max(x, y), 0)
  var result = bins.map((value, i) => `
    <rect
      x="${Math.round(i * barWidth)}"
      y="${Math.round(height / 2)}px"
      height="${Math.round((value / 256) * height * multiplier)}"
      width="${Math.round(width / bins.length * 0.8)}"
    />
  `)
  return result.join('')
}