{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "white",
  "padding": 5,
  "width": 200,
  "data": [
    {"name": "brush_store"},
    {"name": "source_0", "url": "data/cars.json", "format": {"type": "json"}},
    {
      "name": "data_0",
      "source": "source_0",
      "transform": [
        {
          "type": "filter",
          "expr": "isValid(datum[\"Horsepower\"]) && isFinite(+datum[\"Horsepower\"]) && isValid(datum[\"Miles_per_Gallon\"]) && isFinite(+datum[\"Miles_per_Gallon\"])"
        }
      ]
    },
    {
      "name": "data_1",
      "source": "source_0",
      "transform": [
        {
          "type": "filter",
          "expr": "(datum.Weight_in_lbs > 3000) && (!length(data(\"brush_store\")) || vlSelectionTest(\"brush_store\", datum))"
        },
        {
          "type": "filter",
          "expr": "isValid(datum[\"Acceleration\"]) && isFinite(+datum[\"Acceleration\"]) && isValid(datum[\"Displacement\"]) && isFinite(+datum[\"Displacement\"])"
        }
      ]
    }
  ],
  "signals": [
    {"name": "childHeight", "value": 200},
    {
      "name": "unit",
      "value": {},
      "on": [
        {"events": "mousemove", "update": "isTuple(group()) ? group() : unit"}
      ]
    },
    {
      "name": "brush",
      "update": "vlSelectionResolve(\"brush_store\", \"union\")"
    }
  ],
  "layout": {"padding": 20, "columns": 1, "bounds": "full", "align": "each"},
  "marks": [
    {
      "type": "group",
      "name": "concat_0_group",
      "style": "cell",
      "encode": {
        "update": {
          "width": {"signal": "width"},
          "height": {"signal": "childHeight"}
        }
      },
      "signals": [
        {
          "name": "brush_x",
          "value": [],
          "on": [
            {
              "events": {
                "source": "scope",
                "type": "mousedown",
                "filter": [
                  "!event.item || event.item.mark.name !== \"brush_brush\""
                ]
              },
              "update": "[x(unit), x(unit)]"
            },
            {
              "events": {
                "source": "window",
                "type": "mousemove",
                "consume": true,
                "between": [
                  {
                    "source": "scope",
                    "type": "mousedown",
                    "filter": [
                      "!event.item || event.item.mark.name !== \"brush_brush\""
                    ]
                  },
                  {"source": "window", "type": "mouseup"}
                ]
              },
              "update": "[brush_x[0], clamp(x(unit), 0, width)]"
            },
            {
              "events": {"signal": "brush_scale_trigger"},
              "update": "[scale(\"concat_0_x\", brush_Horsepower[0]), scale(\"concat_0_x\", brush_Horsepower[1])]"
            },
            {
              "events": [{"source": "view", "type": "dblclick"}],
              "update": "[0, 0]"
            },
            {
              "events": {"signal": "brush_translate_delta"},
              "update": "clampRange(panLinear(brush_translate_anchor.extent_x, brush_translate_delta.x / span(brush_translate_anchor.extent_x)), 0, width)"
            },
            {
              "events": {"signal": "brush_zoom_delta"},
              "update": "clampRange(zoomLinear(brush_x, brush_zoom_anchor.x, brush_zoom_delta), 0, width)"
            }
          ]
        },
        {
          "name": "brush_Horsepower",
          "on": [
            {
              "events": {"signal": "brush_x"},
              "update": "brush_x[0] === brush_x[1] ? null : invert(\"concat_0_x\", brush_x)"
            }
          ]
        },
        {
          "name": "brush_y",
          "value": [],
          "on": [
            {
              "events": {
                "source": "scope",
                "type": "mousedown",
                "filter": [
                  "!event.item || event.item.mark.name !== \"brush_brush\""
                ]
              },
              "update": "[y(unit), y(unit)]"
            },
            {
              "events": {
                "source": "window",
                "type": "mousemove",
                "consume": true,
                "between": [
                  {
                    "source": "scope",
                    "type": "mousedown",
                    "filter": [
                      "!event.item || event.item.mark.name !== \"brush_brush\""
                    ]
                  },
                  {"source": "window", "type": "mouseup"}
                ]
              },
              "update": "[brush_y[0], clamp(y(unit), 0, childHeight)]"
            },
            {
              "events": {"signal": "brush_scale_trigger"},
              "update": "[scale(\"concat_0_y\", brush_Miles_per_Gallon[0]), scale(\"concat_0_y\", brush_Miles_per_Gallon[1])]"
            },
            {
              "events": [{"source": "view", "type": "dblclick"}],
              "update": "[0, 0]"
            },
            {
              "events": {"signal": "brush_translate_delta"},
              "update": "clampRange(panLinear(brush_translate_anchor.extent_y, brush_translate_delta.y / span(brush_translate_anchor.extent_y)), 0, childHeight)"
            },
            {
              "events": {"signal": "brush_zoom_delta"},
              "update": "clampRange(zoomLinear(brush_y, brush_zoom_anchor.y, brush_zoom_delta), 0, childHeight)"
            }
          ]
        },
        {
          "name": "brush_Miles_per_Gallon",
          "on": [
            {
              "events": {"signal": "brush_y"},
              "update": "brush_y[0] === brush_y[1] ? null : invert(\"concat_0_y\", brush_y)"
            }
          ]
        },
        {
          "name": "brush_scale_trigger",
          "value": {},
          "on": [
            {
              "events": [{"scale": "concat_0_x"}, {"scale": "concat_0_y"}],
              "update": "(!isArray(brush_Horsepower) || (+invert(\"concat_0_x\", brush_x)[0] === +brush_Horsepower[0] && +invert(\"concat_0_x\", brush_x)[1] === +brush_Horsepower[1])) && (!isArray(brush_Miles_per_Gallon) || (+invert(\"concat_0_y\", brush_y)[0] === +brush_Miles_per_Gallon[0] && +invert(\"concat_0_y\", brush_y)[1] === +brush_Miles_per_Gallon[1])) ? brush_scale_trigger : {}"
            }
          ]
        },
        {
          "name": "brush_tuple",
          "on": [
            {
              "events": [
                {"signal": "brush_Horsepower || brush_Miles_per_Gallon"}
              ],
              "update": "brush_Horsepower && brush_Miles_per_Gallon ? {unit: \"concat_0\", fields: brush_tuple_fields, values: [brush_Horsepower,brush_Miles_per_Gallon]} : null"
            }
          ]
        },
        {
          "name": "brush_tuple_fields",
          "value": [
            {"field": "Horsepower", "channel": "x", "type": "R"},
            {"field": "Miles_per_Gallon", "channel": "y", "type": "R"}
          ]
        },
        {
          "name": "brush_translate_anchor",
          "value": {},
          "on": [
            {
              "events": [
                {
                  "source": "scope",
                  "type": "mousedown",
                  "markname": "brush_brush"
                }
              ],
              "update": "{x: x(unit), y: y(unit), extent_x: slice(brush_x), extent_y: slice(brush_y)}"
            }
          ]
        },
        {
          "name": "brush_translate_delta",
          "value": {},
          "on": [
            {
              "events": [
                {
                  "source": "window",
                  "type": "mousemove",
                  "consume": true,
                  "between": [
                    {
                      "source": "scope",
                      "type": "mousedown",
                      "markname": "brush_brush"
                    },
                    {"source": "window", "type": "mouseup"}
                  ]
                }
              ],
              "update": "{x: brush_translate_anchor.x - x(unit), y: brush_translate_anchor.y - y(unit)}"
            }
          ]
        },
        {
          "name": "brush_zoom_anchor",
          "on": [
            {
              "events": [
                {
                  "source": "scope",
                  "type": "wheel",
                  "consume": true,
                  "markname": "brush_brush"
                }
              ],
              "update": "{x: x(unit), y: y(unit)}"
            }
          ]
        },
        {
          "name": "brush_zoom_delta",
          "on": [
            {
              "events": [
                {
                  "source": "scope",
                  "type": "wheel",
                  "consume": true,
                  "markname": "brush_brush"
                }
              ],
              "force": true,
              "update": "pow(1.001, event.deltaY * pow(16, event.deltaMode))"
            }
          ]
        },
        {
          "name": "brush_modify",
          "on": [
            {
              "events": {"signal": "brush_tuple"},
              "update": "modify(\"brush_store\", brush_tuple, true)"
            }
          ]
        }
      ],
      "marks": [
        {
          "name": "brush_brush_bg",
          "type": "rect",
          "clip": true,
          "encode": {
            "enter": {
              "fill": {"value": "#333"},
              "fillOpacity": {"value": 0.125}
            },
            "update": {
              "x": [
                {
                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_0\"",
                  "signal": "brush_x[0]"
                },
                {"value": 0}
              ],
              "y": [
                {
                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_0\"",
                  "signal": "brush_y[0]"
                },
                {"value": 0}
              ],
              "x2": [
                {
                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_0\"",
                  "signal": "brush_x[1]"
                },
                {"value": 0}
              ],
              "y2": [
                {
                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_0\"",
                  "signal": "brush_y[1]"
                },
                {"value": 0}
              ]
            }
          }
        },
        {
          "name": "concat_0_marks",
          "type": "symbol",
          "style": ["point"],
          "interactive": true,
          "from": {"data": "data_0"},
          "encode": {
            "update": {
              "opacity": {"value": 0.7},
              "fill": {"value": "transparent"},
              "stroke": {"value": "#4c78a8"},
              "ariaRoleDescription": {"value": "point"},
              "description": {
                "signal": "\"Horsepower: \" + (format(datum[\"Horsepower\"], \"\")) + \"; Miles_per_Gallon: \" + (format(datum[\"Miles_per_Gallon\"], \"\"))"
              },
              "x": {"scale": "concat_0_x", "field": "Horsepower"},
              "y": {"scale": "concat_0_y", "field": "Miles_per_Gallon"}
            }
          }
        },
        {
          "name": "brush_brush",
          "type": "rect",
          "clip": true,
          "encode": {
            "enter": {"fill": {"value": "transparent"}},
            "update": {
              "x": [
                {
                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_0\"",
                  "signal": "brush_x[0]"
                },
                {"value": 0}
              ],
              "y": [
                {
                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_0\"",
                  "signal": "brush_y[0]"
                },
                {"value": 0}
              ],
              "x2": [
                {
                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_0\"",
                  "signal": "brush_x[1]"
                },
                {"value": 0}
              ],
              "y2": [
                {
                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_0\"",
                  "signal": "brush_y[1]"
                },
                {"value": 0}
              ],
              "stroke": [
                {
                  "test": "brush_x[0] !== brush_x[1] && brush_y[0] !== brush_y[1]",
                  "value": "white"
                },
                {"value": null}
              ]
            }
          }
        }
      ],
      "axes": [
        {
          "scale": "concat_0_x",
          "orient": "bottom",
          "gridScale": "concat_0_y",
          "grid": true,
          "tickCount": {"signal": "ceil(width/40)"},
          "domain": false,
          "labels": false,
          "aria": false,
          "maxExtent": 0,
          "minExtent": 0,
          "ticks": false,
          "zindex": 0
        },
        {
          "scale": "concat_0_y",
          "orient": "left",
          "gridScale": "concat_0_x",
          "grid": true,
          "tickCount": {"signal": "ceil(childHeight/40)"},
          "domain": false,
          "labels": false,
          "aria": false,
          "maxExtent": 0,
          "minExtent": 0,
          "ticks": false,
          "zindex": 0
        },
        {
          "scale": "concat_0_x",
          "orient": "bottom",
          "grid": false,
          "title": "Horsepower",
          "labelFlush": true,
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(width/40)"},
          "zindex": 0
        },
        {
          "scale": "concat_0_y",
          "orient": "left",
          "grid": false,
          "title": "Miles_per_Gallon",
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(childHeight/40)"},
          "zindex": 0
        }
      ]
    },
    {
      "type": "group",
      "name": "concat_1_group",
      "style": "cell",
      "encode": {
        "update": {
          "width": {"signal": "width"},
          "height": {"signal": "childHeight"}
        }
      },
      "marks": [
        {
          "name": "concat_1_marks",
          "type": "symbol",
          "style": ["point"],
          "interactive": false,
          "from": {"data": "data_1"},
          "encode": {
            "update": {
              "opacity": {"value": 0.7},
              "fill": {"value": "transparent"},
              "stroke": {"value": "#4c78a8"},
              "ariaRoleDescription": {"value": "point"},
              "description": {
                "signal": "\"Acceleration: \" + (format(datum[\"Acceleration\"], \"\")) + \"; Displacement: \" + (format(datum[\"Displacement\"], \"\"))"
              },
              "x": {"scale": "concat_1_x", "field": "Acceleration"},
              "y": {"scale": "concat_1_y", "field": "Displacement"}
            }
          }
        }
      ],
      "axes": [
        {
          "scale": "concat_1_x",
          "orient": "bottom",
          "gridScale": "concat_1_y",
          "grid": true,
          "tickCount": {"signal": "ceil(width/40)"},
          "domain": false,
          "labels": false,
          "aria": false,
          "maxExtent": 0,
          "minExtent": 0,
          "ticks": false,
          "zindex": 0
        },
        {
          "scale": "concat_1_y",
          "orient": "left",
          "gridScale": "concat_1_x",
          "grid": true,
          "tickCount": {"signal": "ceil(childHeight/40)"},
          "domain": false,
          "labels": false,
          "aria": false,
          "maxExtent": 0,
          "minExtent": 0,
          "ticks": false,
          "zindex": 0
        },
        {
          "scale": "concat_1_x",
          "orient": "bottom",
          "grid": false,
          "title": "Acceleration",
          "labelFlush": true,
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(width/40)"},
          "zindex": 0
        },
        {
          "scale": "concat_1_y",
          "orient": "left",
          "grid": false,
          "title": "Displacement",
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(childHeight/40)"},
          "zindex": 0
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "concat_0_x",
      "type": "linear",
      "domain": {"data": "data_0", "field": "Horsepower"},
      "range": [0, {"signal": "width"}],
      "nice": true,
      "zero": true
    },
    {
      "name": "concat_0_y",
      "type": "linear",
      "domain": {"data": "data_0", "field": "Miles_per_Gallon"},
      "range": [{"signal": "childHeight"}, 0],
      "nice": true,
      "zero": true
    },
    {
      "name": "concat_1_x",
      "type": "linear",
      "domain": [0, 25],
      "range": [0, {"signal": "width"}],
      "zero": true
    },
    {
      "name": "concat_1_y",
      "type": "linear",
      "domain": [0, 500],
      "range": [{"signal": "childHeight"}, 0],
      "zero": true
    }
  ]
}