{
  "title": "Sample-based encoding of multivecs",
  "subtitle": "Use different colormap per sample",
  "layout": "circular",
//   "arrangement": "vertical",
  "centerRadius": 0.7,
  "views": [
    {
      "tracks": [
        {
          "data": {
            "url": "https://server.gosling-lang.org/api/v1/tileset_info/?d=cistrome-multivec",
            "type": "multivec",
            "row": "sample",
            "column": "position",
            "value": "peak",
            "categories": ["sample 1", "sample 2", "sample 3", "sample 4"],
            "binSize": 4
          },
          "overlay": [
            {
              "mark": "rect",
              "dataTransform": {
                "filter": [
                  { "field": "sample", "oneOf": ["sample 1"] }
                ]
              },
              "color": {
                "field": "peak",
                "type": "quantitative",
                "range": "viridis"
              }
            },
            {
              "mark": "rect",
              "dataTransform": {
                "filter": [
                  { "field": "sample", "oneOf": ["sample 2"] }
                ]
              },
              "color": {
                "field": "peak",
                "type": "quantitative",
                "range": "bupu"
              }
            },
            {
              "mark": "rect",
              "dataTransform": {
                "filter": [
                  { "field": "sample", "oneOf": ["sample 3"] }
                ]
              },
              "color": {
                "field": "peak",
                "type": "quantitative",
                "range": "spectral"
              }
            },
            {
              "mark": "rect",
              "dataTransform": {
                "filter": [
                  { "field": "sample", "oneOf": ["sample 4"] }
                ]
              },
              "color": {
                "field": "peak",
                "type": "quantitative",
                "range": "warm"
              }
            }
          ],
          "x": {"field": "start", "type": "genomic", "axis": "top"},
          "xe": {"field": "end", "type": "genomic"},
          "row": {"field": "sample", "type": "nominal" , "domain": ["sample 1", "sample 2", "sample 3", "sample 4"]},
          "color": {"field": "peak", "type": "quantitative"},
          "width": 600,
          "height": 46
        }
      ]
    }
  ]
}