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{
  "$schema": "https://vega.github.io/schema/vega/v3.0.json",
  "width": 900,
  "height": 520,
  "autosize": "none",

  "config": {
    "legend": {
      "gradientWidth": 120,
      "gradientHeight": 10
    }
  },
  "signals": [
    { "name": "tx", "update": "width / 2" },
    { "name": "ty", "update": "height / 2" },
    {
      "name": "scale",
      "value": 700,
      "on": [{
        "events": {"type": "wheel", "consume": true},
        "update": "clamp(scale * pow(1.0005, -event.deltaY * pow(16, event.deltaMode)), 150, 3000)"
      }]
    },
    {
      "name": "angles",
      "value": [0, 0],
      "on": [{
        "events": "mousedown",
        "update": "[rotateX, centerY]"
      }]
    },
    {
      "name": "cloned",
      "value": null,
      "on": [{
        "events": "mousedown",
        "update": "copy('projection')"
      }]
    },
    {
      "name": "start",
      "value": null,
      "on": [{
        "events": "mousedown",
        "update": "invert(cloned, xy())"
      }]
    },
    {
      "name": "drag", "value": null,
      "on": [{
        "events": "[mousedown, window:mouseup] > window:mousemove",
        "update": "invert(cloned, xy())"
      }]
    },
    {
      "name": "delta", "value": null,
      "on": [{
        "events": {"signal": "drag"},
        "update": "[drag[0] - start[0], start[1] - drag[1]]"
      }]
    },
    {
      "name": "rotateX", "value": 0,
      "on": [{
        "events": {"signal": "delta"},
        "update": "angles[0] + delta[0]"
      }]
    },
    {
      "name": "centerY", "value": 39.262570,
      "on": [{
        "events": {"signal": "delta"},
        "update": "clamp(angles[1] + delta[1], -60, 60)"
      }]
    }
  ],


  "data": [
    {
      "name": "states",
      "url": "data/us-10m.json",
      "format": {"type": "topojson", "feature": "states"}
    },
    {
      "name": "obesity",
      "url": "data/obesity.json",
      "transform": [
        {
          "type": "lookup",
          "from": "states", "key": "id",
          "fields": ["id"], "as": ["geo"]
        },
        {
          "type": "filter",
          "expr": "datum.geo"
        },
        {
          "type": "formula", "as": "centroid",
          "expr": "geoCentroid('projection', datum.geo)"
        },
        {
          "type": "force",
          "static": true,
          "forces": [
            {"force": "collide", "radius": {"expr": "1 + sqrt(datum.rate) / 0.013"}},
            {"force": "x", "x": "centroid[0]"},
            {"force": "y", "y": "centroid[1]"}
          ]
        }        
      ]
    }
  ],

 "projections": [
    {
      "name": "projection",
      "type": "mercator",
      "scale": {
        "signal": "scale"
      },
      "rotate": [
        {
          "signal": "rotateX"
        },
        0,
        0
      ],
      "center": [
        -101.08,
        {
          "signal": "centerY"
        }
      ],
      "translate": [
        {
          "signal": "width / 2"
        },
        {
          "signal": "height / 2"
        }
      ]
    }
  ],

  "scales": [
    {
      "name": "size",
      "domain": {"data": "obesity", "field": "rate"},
      "range": [0, 5000]
    },
    {
      "name": "color",
      "type": "sequential",
      "nice": true,
      "domain": {"data": "obesity", "field": "rate"},
      "range": "ramp"
    }
  ],

  "legends": [
    {
      "title": "% of Obese Adults",
      "orient": "bottom-right",
      "type": "gradient",
      "fill": "color",
      "format": ".1%"
    }
  ],

  "marks": [
    {
      "type": "shape",
      "from": {
        "data": "states"
      },
      "encode": {
        "enter": {
          "strokeWidth": {
            "value": 2
          },
          "stroke": {
            "value": "gray"
          },
          "fill": {
            "value": "transparent"
          }
        }
      },
      "transform": [
        {
          "type": "geoshape",
          "projection": "projection"
        }
      ]
    },    
    {
      "name": "circles",
      "type": "symbol",
      "from": {"data": "obesity"},
      "encode": {
        "update": {
          "size": {"scale": "size", "field": "rate"},
          "fill": {"scale": "color", "field": "rate"},
          "stroke": {"value": "white"},
          "strokeWidth": {"value": 1.5},
          "x": {"field": "x"},
          "y": {"field": "y"},
          "tooltip": {"signal": "'Obesity Rate: ' + format(datum.rate, '.1%')"}
        },
        "hover":{

          "strokeWidth": {
            "value": 1.5
          },
          "stroke": {
            "value": "black"
          }
        }
      }    
    },
    {
      "type": "text",
      "interactive": false,
      "from": {"data": "circles"},
      "encode": {
        "enter": {
          "align": {"value": "center"},
          "baseline": {"value": "middle"},
          "fontSize": {"value": 13},
          "fontWeight": {"value": "bold"},
          "text": {"field": "datum.state"}
        },
        "update": {
          "x": {"field": "x"},
          "y": {"field": "y"}
        }
      }     
    }   
  ]
}