{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "width": 500,
  "height": 150,
  "padding": 5,

  "signals": [
    {
      "name": "curve", "value": "linear",
      "bind": {
        "input": "select",
        "options": ["linear", "monotone", "step"]
      }
    },
    {
      "name": "aggregate", "value": "sum",
      "bind": {
        "input": "select",
        "options": ["sum", "count", "average", "median", "stdev"]
      }
    },
    {
      "name": "frameStart", "value": null,
      "bind": {"input": "select", "options": [null, -5, -2, 0]}
    },
    {
      "name": "frameEnd", "value": 0,
      "bind": {"input": "select", "options": [0, 2, 5, null]}
    },
    {
      "name": "startLabel",
      "update": "if(frameStart == null, '-\u221e', frameStart)"
    },
    {
      "name": "endLabel",
      "update": "if(frameEnd == null, '+\u221e', frameEnd)"
    }
  ],

  "data": [
    {
      "name": "table",
      "values": [
        {"u": 1,  "v": 28}, {"u": 2,  "v": 55},
        {"u": 3,  "v": 43}, {"u": 4,  "v": 91},
        {"u": 5,  "v": 81}, {"u": 6,  "v": 53},
        {"u": 7,  "v": 19}, {"u": 8,  "v": 87},
        {"u": 9,  "v": 52}, {"u": 10, "v": 48},
        {"u": 11, "v": 24}, {"u": 12, "v": 49},
        {"u": 13, "v": 87}, {"u": 14, "v": 66},
        {"u": 15, "v": 17}, {"u": 16, "v": 27},
        {"u": 17, "v": 68}, {"u": 18, "v": 16},
        {"u": 19, "v": 49}, {"u": 20, "v": 15}
      ],
      "transform": [
        {
          "type": "window",
          "sort": {"field": "u"},
          "frame": [{"signal": "frameStart"}, {"signal": "frameEnd"}],
          "ops": [{"signal": "aggregate"}, "rank"],
          "fields": ["v", null],
          "as": ["value", null]
        }
      ]
    }
  ],

  "scales": [
    {
      "name": "xscale",
      "type": "linear",
      "range": "width",
      "zero": false,
      "domain": {"data": "table", "field": "u"}
    },
    {
      "name": "yscale",
      "type": "linear",
      "range": "height",
      "nice": true,
      "zero": true,
      "domain": {"data": "table", "field": "value"}
    }
  ],

  "title": {
    "text": {"signal": "aggregate + '(value) over sliding window: [' + startLabel + ',' + endLabel + ']'"},
    "orient": "bottom"
  },

  "axes": [
    { "orient": "bottom", "scale": "xscale", "tickCount": 20, "zindex": 1 },
    { "orient": "left", "scale": "yscale", "tickCount": 5, "zindex": 1 }
  ],

  "marks": [
    {
      "type": "line",
      "from": {"data": "table"},
      "encode": {
        "enter": {
          "x": {"scale": "xscale", "field": "u"},
          "stroke": {"value": "steelblue"},
          "strokeWidth": {"value": 3}
        },
        "update": {
          "y": {"scale": "yscale", "field": "value"},
          "interpolate": {"signal": "curve"}
        }
      }
    }
  ]
}
