chords.js

var gieStainColor = {
  gpos100: 'rgb(0,0,0)',
  gpos: 'rgb(0,0,0)',
  gpos75: 'rgb(130,130,130)',
  gpos66: 'rgb(160,160,160)',
  gpos50: 'rgb(200,200,200)',
  gpos33: 'rgb(210,210,210)',
  gpos25: 'rgb(200,200,200)',
  gvar: 'rgb(220,220,220)',
  gneg: 'rgb(255,255,255)',
  acen: 'rgb(217,47,39)',
  stalk: 'rgb(100,127,164)',
  select: 'rgb(135,177,255)'
}

var drawCircos = function (error, GRCh37, cytobands, data) {
  var width = document.getElementsByClassName('mdl-card__supporting-text')[0].offsetWidth
  var circos = new Circos({
    container: '#chordsChart',
    width: width,
    height: width
  })

  cytobands = cytobands.map(function (d) {
    return {
      block_id: d.chrom,
      start: parseInt(d.chromStart),
      end: parseInt(d.chromEnd),
      gieStain: d.gieStain,
      name: d.name
    }
  })

  data = data.map(function (d) {
    return {
      source: {
        id: d.source_id,
        start: parseInt(d.source_breakpoint) - 2000000,
        end: parseInt(d.source_breakpoint) + 2000000
      },
      target: {
        id: d.target_id,
        start: parseInt(d.target_breakpoint) - 2000000,
        end: parseInt(d.target_breakpoint) + 2000000
      }
    }
  })

  circos
    .layout(
      GRCh37,
    {
      innerRadius: width/2 - 80,
      outerRadius: width/2 - 40,
      labels: {
        radialOffset: 70
      },
      ticks: {
        display: true,
        labelDenominator: 1000000
      }
    }
    )
    .highlight('cytobands', cytobands, {
      innerRadius: width/2 - 80,
      outerRadius: width/2 - 40,
      opacity: 0.3,
      color: function (d) {
        return gieStainColor[d.gieStain]
      },
      tooltipContent: function (d) {
        return d.name
      }
    })
    .chords(
      'l1',
      data,
    {
      logScale: false,
      opacity: 0.7,
      color: '#ff5722',
      tooltipContent: function (d) {
        return d.source.id + ' ➤ ' + d.target.id + ': ' + d.value
      }
    }
    )
    .render()
}

d3.queue()
  .defer(d3.json, './data/GRCh37.json')
  .defer(d3.csv, './data/cytobands.csv')
  .defer(d3.csv, './data/fusion-genes.csv')
  .await(drawCircos)