I recently came across a tweet by @Haquafresh that pointed to a Tadpole chart that is now available in Tableau. With a 100 lines of json code, excluding configuration, it is also available in PowerBI using Deneb.
Dataset
The dataset is the Tableau Superstore dataset, that can be found at the following link.
Additional fields created
Profit
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Profit = SUM ( Orders[Profit] )
CY
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CY = CALCULATE( [Profit], 'Date'[Year] = 2021 )
PY
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PY = CALCULATE( [Profit], 'Date'[Year] = 2020 )
Diff
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Diff =
VAR __Diff = [CY] - [PY]
VAR __Check = IF ( __Diff > 0, 1, -1 )
RETURN
__Check
Fields used
- ‘Product’[Sub-Category]
- CY
- PY
- Diff
Specification
The specification in a nutshell:
* layer
* rule
* point
* text
With a small change to the specification, you can change the circle point to an arrow, as proposed by Steve Wexler.
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...
"mark": {
"type": "point",
"shape": {
"expr": "datum.Diff > 0 ? 'triangle-right' : 'triangle-left'"
},
"size": 110,
"opacity": 1,
"color": {
"expr": "datum.Diff > 0 ? '#2d5f8e' : '#a44022'"
}
}
...
View chart
Open the Chart in the Vega Editor
JSON template
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{
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"usermeta": {
"deneb": {
"build": "1.4.0.0",
"metaVersion": 1,
"provider": "vegaLite",
"providerVersion": "5.4.0"
},
"interactivity": {
"tooltip": true,
"contextMenu": true,
"selection": false,
"highlight": false,
"dataPointLimit": 50
},
"information": {
"name": "Tadpole Chart",
"description": "[No Description Provided]",
"author": "ThysvdW",
"uuid": "d2f72e90-5e0b-438d-a848-d1121c8eacd1",
"generated": "2022-10-10T06:53:23.124Z"
},
"dataset": [
{
"key": "__0__",
"name": "SubCategory",
"description": "Product Sub-Category",
"type": "text",
"kind": "column"
},
{
"key": "__1__",
"name": "CY",
"description": "Current Year measure",
"type": "numeric",
"kind": "measure"
},
{
"key": "__2__",
"name": "PY",
"description": "Previous Year measure",
"type": "numeric",
"kind": "measure"
},
{
"key": "__3__",
"name": "Diff",
"description": "Indicator to show negative / positive difference",
"type": "numeric",
"kind": "measure"
}
]
},
"config": {
"view": {"stroke": "transparent"},
"font": "Segoe UI",
"arc": {},
"area": {
"line": true,
"opacity": 0.6
},
"bar": {},
"line": {
"strokeWidth": 3,
"strokeCap": "round",
"strokeJoin": "round"
},
"path": {},
"point": {
"filled": true,
"size": 75
},
"rect": {},
"shape": {},
"symbol": {
"strokeWidth": 1.5,
"size": 50
},
"text": {
"font": "Segoe UI",
"fontSize": 12,
"fill": "#605E5C"
},
"axis": {
"ticks": false,
"grid": false,
"domain": false,
"labelColor": "#605E5C",
"labelFontSize": 12,
"titleFont": "wf_standard-font, helvetica, arial, sans-serif",
"titleColor": "#252423",
"titleFontSize": 16,
"titleFontWeight": "normal"
},
"axisQuantitative": {
"tickCount": 3,
"grid": true,
"gridColor": "#C8C6C4",
"gridDash": [1, 5],
"labelFlush": false
},
"axisX": {
"labelPadding": 5,
"labelFontSize": 10
},
"axisY": {"labelPadding": 10},
"header": {
"titleFont": "wf_standard-font, helvetica, arial, sans-serif",
"titleFontSize": 16,
"titleColor": "#252423",
"labelFont": "Segoe UI",
"labelFontSize": 13.333333333333332,
"labelColor": "#605E5C"
},
"legend": {
"titleFont": "Segoe UI",
"titleFontWeight": "bold",
"titleColor": "#605E5C",
"labelFont": "Segoe UI",
"labelFontSize": 13.333333333333332,
"labelColor": "#605E5C",
"symbolType": "circle",
"symbolSize": 75
}
},
"data": {"name": "dataset"},
"encoding": {
"y": {
"field": "__0__",
"axis": {
"title": "Sub-Category",
"titleAngle": 0,
"titleX": -40,
"titleY": 0,
"labelFontSize": 14
}
}
},
"layer": [
{
"mark": {
"type": "rule",
"size": 4,
"strokeCap": "round",
"color": {
"expr": "datum['__3__'] > 0 ? '#2d5f8e' : '#a44022'"
}
},
"encoding": {
"x": {
"field": "__1__",
"type": "quantitative",
"axis": {
"title": "Profit",
"ticks": false,
"tickCount": 8,
"format": "$,.0f"
},
"scale": {
"domain": [-11000, 30000]
}
},
"x2": {"field": "__2__"}
}
},
{
"mark": {
"type": "point",
"size": 110,
"opacity": 1,
"color": {
"expr": "datum['__3__'] > 0 ? '#2d5f8e' : '#a44022'"
}
},
"encoding": {
"x": {
"field": "__1__",
"type": "quantitative",
"axis": {
"title": "Profit",
"ticks": false,
"tickCount": 8,
"format": "$,.0f"
},
"scale": {
"domain": [-11000, 30000]
}
}
}
},
{
"mark": {
"type": "text",
"fontSize": 14,
"fontWeight": 500,
"dx": {
"expr": "datum['__3__'] > 0 ? 35 : -35"
},
"color": {
"expr": "datum['__3__'] > 0 ? '#2d5f8e' : '#a44022'"
}
},
"encoding": {
"x": {
"field": "__1__",
"type": "quantitative",
"axis": {
"title": "Profit",
"ticks": false,
"tickCount": 8,
"format": "$,.0f"
},
"scale": {
"domain": [-11000, 30000]
}
},
"text": {
"field": "__1__",
"format": "$,.0f"
}
}
}
]
}