interactive_bin_extent_bottom.vg.json

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      "url": "data/flights-5k.json",
      "format": {"type": "json", "parse": {"date": "date"}},
      "transform": [
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          "type": "formula",
          "expr": "hours(datum.date) + minutes(datum.date) / 60",
          "as": "time"
        },
        {
          "type": "extent",
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          "signal": "concat_1_bin_maxbins_30_time_extent"
        },
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          "type": "bin",
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          "signal": "concat_1_bin_maxbins_30_time_bins",
          "extent": {"signal": "concat_1_bin_maxbins_30_time_extent"},
          "maxbins": 30
        },
        {
          "type": "extent",
          "field": "time",
          "signal": "concat_0_bin_maxbins_30_extent_param_brush_time_extent"
        },
        {
          "type": "bin",
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            "bin_maxbins_30_extent_param_brush_time",
            "bin_maxbins_30_extent_param_brush_time_end"
          ],
          "signal": "concat_0_bin_maxbins_30_extent_param_brush_time_bins",
          "extent": {
            "signal": "concat_0_bin_maxbins_30_extent_param_brush_time_extent"
          },
          "span": {"signal": "span(brush[\"time\"])"},
          "maxbins": 30
        }
      ]
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      "name": "data_0",
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        {
          "type": "aggregate",
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          "fields": [null],
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    {"name": "concat_1_height", "value": 50},
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      "on": [
        {"events": "mousemove", "update": "isTuple(group()) ? group() : unit"}
      ]
    },
    {
      "name": "brush",
      "update": "vlSelectionResolve(\"brush_store\", \"union\")"
    }
  ],
  "layout": {"padding": 20, "columns": 1, "bounds": "full", "align": "each"},
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    {
      "type": "group",
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      "style": "cell",
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                "scale": "concat_0_x",
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                "offset": 1
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              },
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              "y2": {"scale": "concat_0_y", "value": 0}
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          }
        }
      ],
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        {
          "scale": "concat_0_y",
          "orient": "left",
          "gridScale": "concat_0_x",
          "grid": true,
          "tickCount": {"signal": "ceil(concat_0_height/40)"},
          "domain": false,
          "labels": false,
          "aria": false,
          "maxExtent": 0,
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          "ticks": false,
          "zindex": 0
        },
        {
          "scale": "concat_0_x",
          "orient": "bottom",
          "grid": false,
          "title": "time (binned)",
          "labelFlush": true,
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(width/10)"},
          "zindex": 0
        },
        {
          "scale": "concat_0_y",
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          "grid": false,
          "title": "Count of Records",
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            {
              "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"}
                ]
              },
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            },
            {
              "events": {"signal": "brush_scale_trigger"},
              "update": "[scale(\"concat_1_x\", brush_time[0]), scale(\"concat_1_x\", brush_time[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_time",
          "on": [
            {
              "events": {"signal": "brush_x"},
              "update": "brush_x[0] === brush_x[1] ? null : invert(\"concat_1_x\", brush_x)"
            }
          ]
        },
        {
          "name": "brush_scale_trigger",
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          "on": [
            {
              "events": [{"scale": "concat_1_x"}],
              "update": "(!isArray(brush_time) || (+invert(\"concat_1_x\", brush_x)[0] === +brush_time[0] && +invert(\"concat_1_x\", brush_x)[1] === +brush_time[1])) ? brush_scale_trigger : {}"
            }
          ]
        },
        {
          "name": "brush_tuple",
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            {
              "events": [{"signal": "brush_time"}],
              "update": "brush_time ? {unit: \"concat_1\", fields: brush_tuple_fields, values: [brush_time]} : null"
            }
          ]
        },
        {
          "name": "brush_tuple_fields",
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        },
        {
          "name": "brush_translate_anchor",
          "value": {},
          "on": [
            {
              "events": [
                {
                  "source": "scope",
                  "type": "mousedown",
                  "markname": "brush_brush"
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              ],
              "update": "{x: x(unit), y: y(unit), extent_x: slice(brush_x)}"
            }
          ]
        },
        {
          "name": "brush_translate_delta",
          "value": {},
          "on": [
            {
              "events": [
                {
                  "source": "window",
                  "type": "mousemove",
                  "consume": true,
                  "between": [
                    {
                      "source": "scope",
                      "type": "mousedown",
                      "markname": "brush_brush"
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                    {"source": "window", "type": "mouseup"}
                  ]
                }
              ],
              "update": "{x: brush_translate_anchor.x - x(unit), y: brush_translate_anchor.y - y(unit)}"
            }
          ]
        },
        {
          "name": "brush_zoom_anchor",
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            {
              "events": [
                {
                  "source": "scope",
                  "type": "wheel",
                  "consume": true,
                  "markname": "brush_brush"
                }
              ],
              "update": "{x: x(unit), y: y(unit)}"
            }
          ]
        },
        {
          "name": "brush_zoom_delta",
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            {
              "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",
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            {
              "events": {"signal": "brush_tuple"},
              "update": "modify(\"brush_store\", brush_tuple, true)"
            }
          ]
        }
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          "name": "brush_brush_bg",
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                  "test": "data(\"brush_store\").length && data(\"brush_store\")[0].unit === \"concat_1\"",
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        }
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          "gridScale": "concat_1_x",
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          "tickCount": {"signal": "ceil(concat_1_height/40)"},
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          "ticks": false,
          "zindex": 0
        },
        {
          "scale": "concat_1_x",
          "orient": "bottom",
          "grid": false,
          "title": "time (binned)",
          "labelFlush": true,
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(width/10)"},
          "zindex": 0
        },
        {
          "scale": "concat_1_y",
          "orient": "left",
          "grid": false,
          "title": "Count",
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(concat_1_height/40)"},
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        }
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    }
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      "domainRaw": {"signal": "brush[\"time\"]"},
      "range": [0, {"signal": "width"}],
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        "signal": "concat_0_bin_maxbins_30_extent_param_brush_time_bins"
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      "zero": false
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    {
      "name": "concat_0_y",
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}