{
  "$schema": "https://vega.github.io/schema/vega/v6.json",
  "width": 200,
  "height": 200,
  "padding": 5,

  "signals": [
    { "name": "x", "value": 50,
      "bind": {"input": "range", "min": 1, "max": 100, "step": 1} },
    { "name": "y", "value": 50,
      "bind": {"input": "range", "min": 1, "max": 100, "step": 1} },
    { "name": "w", "value": 100,
      "bind": {"input": "range", "min": 1, "max": 100, "step": 1} },
    { "name": "h", "value": 100,
      "bind": {"input": "range", "min": 1, "max": 100, "step": 1} },
    { "name": "cornerRadius", "value": 0,
      "bind": {"input": "range", "min": 0, "max": 50, "step": 1} },
    { "name": "strokeWidth", "value": 4,
      "bind": {"input": "range", "min": 0, "max": 10} },
    { "name": "color", "value": "both",
      "bind": {"input": "radio", "options": ["fill", "stroke", "both"]} }
  ],

  "marks": [
    {
      "type": "rect",
      "encode": {
        "enter": {
          "fill": {"value": "#939597"},
          "stroke": {"value": "#652c90"}
        },
        "update": {
          "x": {"signal": "x"},
          "y": {"signal": "y"},
          "width": {"signal": "w"},
          "height": {"signal": "h"},
          "opacity": {"value": 1},
          "cornerRadius": {"signal": "cornerRadius"},
          "strokeWidth": {"signal": "strokeWidth"},
          "fillOpacity": {"signal": "color === 'fill' || color === 'both' ? 1 : 0"},
          "strokeOpacity": {"signal": "color === 'stroke' || color === 'both' ? 1 : 0"}
        },
        "hover": {
          "opacity": {"value": 0.5}
        }
      }
    }
  ]
}