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bar_filter_calc.vg.json
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bar_filter_calc.vg.json
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{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"description": "A simple bar chart with embedded data that uses a filter and calculate.",
"background": "white",
"padding": 5,
"height": 200,
"style": "cell",
"data": [
{
"name": "source_0",
"values": [
{"a": "A", "b": 28},
{"a": "B", "b": 55},
{"a": "C", "b": 43},
{"a": "G", "b": 19},
{"a": "H", "b": 87},
{"a": "I", "b": 52},
{"a": "D", "b": 91},
{"a": "E", "b": 81},
{"a": "F", "b": 53}
]
},
{
"name": "data_0",
"source": "source_0",
"transform": [
{"type": "formula", "expr": "2*datum.b", "as": "b2"},
{"type": "filter", "expr": "datum.b2 > 60"},
{
"type": "stack",
"groupby": ["a"],
"field": "b2",
"sort": {"field": [], "order": []},
"as": ["b2_start", "b2_end"],
"offset": "zero"
},
{
"type": "filter",
"expr": "isValid(datum[\"b2\"]) && isFinite(+datum[\"b2\"])"
}
]
}
],
"signals": [
{"name": "x_step", "value": 20},
{
"name": "width",
"update": "bandspace(domain('x').length, 0.1, 0.05) * x_step"
}
],
"marks": [
{
"name": "marks",
"type": "rect",
"style": ["bar"],
"from": {"data": "data_0"},
"encode": {
"update": {
"fill": {"value": "#4c78a8"},
"ariaRoleDescription": {"value": "bar"},
"description": {
"signal": "\"a: \" + (isValid(datum[\"a\"]) ? datum[\"a\"] : \"\"+datum[\"a\"]) + \"; b2: \" + (format(datum[\"b2\"], \"\"))"
},
"x": {"scale": "x", "field": "a"},
"width": {"signal": "max(0.25, bandwidth('x'))"},
"y": {"scale": "y", "field": "b2_end"},
"y2": {"scale": "y", "field": "b2_start"}
}
}
}
],
"scales": [
{
"name": "x",
"type": "band",
"domain": {"data": "data_0", "field": "a", "sort": true},
"range": {"step": {"signal": "x_step"}},
"paddingInner": 0.1,
"paddingOuter": 0.05
},
{
"name": "y",
"type": "linear",
"domain": {"data": "data_0", "fields": ["b2_start", "b2_end"]},
"range": [{"signal": "height"}, 0],
"nice": true,
"zero": true
}
],
"axes": [
{
"scale": "y",
"orient": "left",
"gridScale": "x",
"grid": true,
"tickCount": {"signal": "ceil(height/40)"},
"domain": false,
"labels": false,
"aria": false,
"maxExtent": 0,
"minExtent": 0,
"ticks": false,
"zindex": 0
},
{
"scale": "x",
"orient": "bottom",
"grid": false,
"title": "a",
"labelAlign": "right",
"labelAngle": 270,
"labelBaseline": "middle",
"zindex": 0
},
{
"scale": "y",
"orient": "left",
"grid": false,
"title": "b2",
"labelOverlap": true,
"tickCount": {"signal": "ceil(height/40)"},
"zindex": 0
}
]
}