MarkColor

Auto-generated from the config schema in the source — see the config guide for concepts. Provided by the marks plugin. View source.

A mark's encoding.color: one CSS color or jexl: callback for every instance in value, or a field through scale, Vega-Lite's scale object: an ordinal scale (a range color per value), a linear, log or symlog scale (a ramp between domainMin and domainMax, domainMid placing its middle stop where a diverging ramp turns; symlog runs logarithmic away from 0 and linear through it, so a signed fold change ramps on both sides) or a threshold scale (a range color per interval between the cut points domain lists). An identity scale paints each feature the CSS color its field holds, or with no field the BED color it carries. A string is the field, as every channel's is inside encoding; a constant is { value }. legend shapes the key the scale draws.

Example usage#

{ mark: 'bar', encoding: { y: 'score', color: { value: 'steelblue' } } }

{ mark: 'point', encoding: { y: 'score', color: 'type' } }

{
  mark: 'point',
  encoding: {
    y: 'score',
    color: { field: 'strand', scale: { domain: ['1', '-1'] } },
  },
}

{
  mark: 'rect',
  encoding: {
    color: {
      field: 'score',
      scale: {
        type: 'log',
        domainMin: 1,
        domainMax: 1000,
        range: ['white', 'red'],
      },
    },
  },
}

{
  mark: 'bar',
  encoding: {
    y: 'score',
    color: {
      field: 'score',
      scale: {
        type: 'linear',
        domainMin: -2,
        domainMax: 6,
        domainMid: 0,
        range: ['blue', 'white', 'red'],
      },
    },
  },
}

{
  mark: 'point',
  encoding: {
    y: 'score',
    color: {
      field: 'pip',
      scale: {
        type: 'threshold',
        domain: [0.1, 0.5],
        range: ['#357ebd', '#eea236', '#d43f3a'],
      },
      legend: { title: 'PIP', descending: true },
    },
  },
}

{
  mark: 'rect',
  encoding: {
    row: 'cellType',
    color: {
      scale: {
        type: 'identity',
        domain: ['rgb(255,0,0)', 'rgb(0,128,0)'],
        names: ['Active TSS', 'Strong transcription'],
      },
    },
  },
}

Preset fields#

A field named here paints through its own scale while scale.type is unset, and range and names index its levels in order while domain is unwritten. Any other field is ordinal.

Config slots#

A setting written to it replaces it whole: a member left out returns to its default. Slot types (fileLocation, frozen, ...) are explained in the config slot types reference. Slots a base configuration contributes are listed here too, so this table is the whole surface.

Related links#

• Config guide: GWAS track