{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Highlight bars matching a brush selection",
  "data": {
    "name": "regional_scores",
    "values": [
      {"region": "west",   "score": 0.42},
      {"region": "east",   "score": 0.91},
      {"region": "north",  "score": 0.68},
      {"region": "south",  "score": 0.55},
      {"region": "central","score": 0.73}
    ]
  },
  "selection": {
    "brush": {"type": "interval", "encodings": ["x"]}
  },
  "mark": "bar",
  "encoding": {
    "x": {"field": "region", "type": "nominal"},
    "y": {"field": "score",  "type": "quantitative"},
    "color": {
      "condition": [
        {"selection": "brush", "value": "#22c55e"}
      ],
      "value": "#cbd5e1"
    }
  }
}