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point_offset_random.vg.json
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point_offset_random.vg.json
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{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"description": "Shows the relationship between horsepower and the number of cylinders using point marks with random offset (jittering).",
"background": "white",
"padding": 5,
"width": 200,
"style": "cell",
"data": [
{
"name": "source_0",
"url": "data/cars.json",
"format": {"type": "json"},
"transform": [
{"type": "formula", "expr": "random()", "as": "random"},
{
"type": "filter",
"expr": "isValid(datum[\"Horsepower\"]) && isFinite(+datum[\"Horsepower\"]) && isValid(datum[\"random\"]) && isFinite(+datum[\"random\"])"
}
]
}
],
"signals": [
{"name": "y_step", "value": 50},
{
"name": "height",
"update": "bandspace(domain('y').length, 0.2, 0.2) * y_step"
}
],
"marks": [
{
"name": "marks",
"type": "symbol",
"style": ["point"],
"from": {"data": "source_0"},
"encode": {
"update": {
"opacity": {"value": 0.7},
"fill": {"value": "transparent"},
"stroke": {"value": "#4c78a8"},
"ariaRoleDescription": {"value": "point"},
"description": {
"signal": "\"Horsepower: \" + (format(datum[\"Horsepower\"], \"\")) + \"; Cylinders: \" + (isValid(datum[\"Cylinders\"]) ? datum[\"Cylinders\"] : \"\"+datum[\"Cylinders\"]) + \"; random: \" + (format(datum[\"random\"], \"\"))"
},
"x": {"scale": "x", "field": "Horsepower"},
"y": {
"scale": "y",
"field": "Cylinders",
"offset": {"scale": "yOffset", "field": "random"}
}
}
}
}
],
"scales": [
{
"name": "x",
"type": "linear",
"domain": {"data": "source_0", "field": "Horsepower"},
"range": [0, {"signal": "width"}],
"nice": true,
"zero": true
},
{
"name": "y",
"type": "band",
"domain": {"data": "source_0", "field": "Cylinders", "sort": true},
"range": {"step": {"signal": "y_step"}},
"paddingInner": 0.2,
"paddingOuter": 0.2
},
{
"name": "yOffset",
"type": "linear",
"domain": {"data": "source_0", "field": "random"},
"range": [0, {"signal": "bandwidth('y')"}],
"zero": false
}
],
"axes": [
{
"scale": "x",
"orient": "bottom",
"gridScale": "y",
"grid": true,
"tickCount": {"signal": "ceil(width/40)"},
"domain": false,
"labels": false,
"aria": false,
"maxExtent": 0,
"minExtent": 0,
"ticks": false,
"zindex": 0
},
{
"scale": "x",
"orient": "bottom",
"grid": false,
"title": "Horsepower",
"labelFlush": true,
"labelOverlap": true,
"tickCount": {"signal": "ceil(width/40)"},
"zindex": 0
},
{
"scale": "y",
"orient": "left",
"grid": false,
"title": "Cylinders",
"zindex": 0
}
]
}