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bar_layered_transparent.vg.json
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bar_layered_transparent.vg.json
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{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"description": "A bar chart showing the US population distribution of age groups and gender in 2000.",
"background": "white",
"padding": 5,
"height": 200,
"style": "cell",
"data": [
{
"name": "source_0",
"url": "data/population.json",
"format": {"type": "json"},
"transform": [
{"type": "filter", "expr": "datum.year == 2000"},
{
"type": "formula",
"expr": "datum.sex == 2 ? 'Female' : 'Male'",
"as": "gender"
},
{
"type": "aggregate",
"groupby": ["age", "gender"],
"ops": ["sum"],
"fields": ["people"],
"as": ["sum_people"]
},
{
"type": "filter",
"expr": "isValid(datum[\"sum_people\"]) && isFinite(+datum[\"sum_people\"])"
}
]
}
],
"signals": [
{"name": "x_step", "value": 17},
{
"name": "width",
"update": "bandspace(domain('x').length, 0.1, 0.05) * x_step"
}
],
"marks": [
{
"name": "marks",
"type": "rect",
"style": ["bar"],
"from": {"data": "source_0"},
"encode": {
"update": {
"fill": {"scale": "color", "field": "gender"},
"opacity": {"value": 0.7},
"ariaRoleDescription": {"value": "bar"},
"description": {
"signal": "\"age: \" + (isValid(datum[\"age\"]) ? datum[\"age\"] : \"\"+datum[\"age\"]) + \"; population: \" + (format(datum[\"sum_people\"], \"\")) + \"; gender: \" + (isValid(datum[\"gender\"]) ? datum[\"gender\"] : \"\"+datum[\"gender\"])"
},
"x": {"scale": "x", "field": "age"},
"width": {"signal": "max(0.25, bandwidth('x'))"},
"y": {"scale": "y", "field": "sum_people"},
"y2": {"scale": "y", "value": 0}
}
}
}
],
"scales": [
{
"name": "x",
"type": "band",
"domain": {"data": "source_0", "field": "age", "sort": true},
"range": {"step": {"signal": "x_step"}},
"paddingInner": 0.1,
"paddingOuter": 0.05
},
{
"name": "y",
"type": "linear",
"domain": {"data": "source_0", "field": "sum_people"},
"range": [{"signal": "height"}, 0],
"nice": true,
"zero": true
},
{
"name": "color",
"type": "ordinal",
"domain": {"data": "source_0", "field": "gender", "sort": true},
"range": ["#675193", "#ca8861"]
}
],
"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": "age",
"labelAlign": "right",
"labelAngle": 270,
"labelBaseline": "middle",
"zindex": 0
},
{
"scale": "y",
"orient": "left",
"grid": false,
"title": "population",
"labelOverlap": true,
"tickCount": {"signal": "ceil(height/40)"},
"zindex": 0
}
],
"legends": [
{
"fill": "color",
"symbolType": "square",
"title": "gender",
"encode": {"symbols": {"update": {"opacity": {"value": 0.7}}}}
}
]
}