Solar demo vega spec

solar_demo_spec.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "A basic area chart example.",
  "width": 1000,
  "height": 400,
  "padding": 5,

  "data": [
    {
      "name": "table",
      //"values": data,
      "url": "https://gist.githubusercontent.com/JamesWilmot/39117ed0b6296646a67da46076edc598/raw/5b301a874ff15736b106cb88db1b463c1226769b/solar_data.json",
      "transform": [
        {
          "type": "formula",
          "expr": "toDate(datum[\"DateTime\"])",
          "as": "DateTime"
        },
      ]
    },
    /*
    {
      "name": "selected",
      "on": [
        {"trigger": "clear", "remove": true},
        {"trigger": "!shift", "remove": true},
        {"trigger": "!shift && clicked", "insert": "clicked"},
        {"trigger": "shift && clicked", "toggle": "clicked"}
      ]
    }
    */
    
  ],
  /*
  "legends": [
    {
      "stroke": "cscale",
      "title": "Year",
      "padding": 4,
      "encode": {
        "symbols": {
          "enter": {
            "strokeWidth": {"value": 2},
            "size": {"value": 50}
          }
        }
      }
    }
  ],
  */
  

  "scales": [
    {
      "name": "xscale",
      "type": "time",
      "range": "width",
      "zero": false,
      "domain": {"data": "table", "field": "DateTime"}
    },
    {
      "name": "yscale",
      "type": "linear",
      "range": "height",
      "nice": true,
      "zero": true,
      "domain": {"data": "table", "field": "Energy"}
    },
    {
      "name": "yscale2",
      "type": "linear",
      "range": "height",
      //"domainMax": 5000,
      //"nice": true,
      "zero": true,
      "domain": {"data": "table", "field": "Power"}
      //"domain": {"data": "table", "field": "v"}
    }
  ],

  "axes": [
    {"orient": "bottom", "scale": "xscale", "tickCount": 20, "title": "Time"},
    {"orient": "left", "scale": "yscale", "title": "Energy (kw/h)"},
    {"orient": "right", "scale": "yscale2", "title": "Power (watt)"}
  ],

  "marks": [
    {
      "type": "area",
      "from": {"data": "table"},
      "encode": {
        "enter": {
          "x": {"scale": "xscale", "field": "DateTime"},
          "y": {"scale": "yscale", "field": "Energy"},
          "y2": {"scale": "yscale", "value": 0},
          "fill": {"value": "steelblue"},
          "interpolate": {"value": "natural"}
        },
        "hover": {
          //"fillOpacity": {"value": 0.5}
        }
      }
    },
    {
      "type": "line",
      "from": {"data": "table"},
      "encode": {
        "enter": {
          "x": {"scale": "xscale", "field": "DateTime"},
          "y": {"scale": "yscale2", "field": "Power"},
          "interpolate": {"value": "natural"}
        },
        "hover": {
          //"fillOpacity": {"value": 0.5}
        }
      }
    }
  ]
}