{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "width": 300,
  "height": 300,
  "padding": 5,

  "signals": [
    {
      "name": "url",
      "value": "data/normal-2d.json",
      "bind": {
        "input": "select",
        "options": [
          "data/normal-2d.json",
          "data/uniform-2d.json"
        ]
      }
    },
    {
      "name": "async",
      "value": false,
      "bind": {"input": "checkbox"}
    }
  ],

  "data": [
    {
      "name": "table",
      "url": {"signal": "url"},
      "async": {"signal": "async"}
    }
  ],

  "scales": [
    {
      "name": "xscale",
      "type": "linear",
      "range": "width",
      "domain": [-0.7, 0.7]
    },
    {
      "name": "yscale",
      "type": "linear",
      "range": "height",
      "domain": [-0.7, 0.7]
    }
  ],

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

  "marks": [
    {
      "type": "symbol",
      "from": {"data": "table"},
      "encode": {
        "enter": {
          "x": {"scale": "xscale", "field": "u"},
          "y": {"scale": "yscale", "field": "v"},
          "fillOpacity": {"value": 0.8}
        },
        "update": {
          "fill": {"value": "steelblue"}
        },
        "hover": {
          "fill": {"value": "red"}
        }
      }
    }
  ]
}