Part-to-whole

Nightingale rose chart

Use a nightingale rose chart when category values are heavily skewed and a standard pie would leave the small slices unreadable, since radius scaling exaggerates the difference between values compared to angle alone. It reads best with a legend, since slice angles are equal.

Variant of Pie chart: the same chart:pie panel type, a different spec.

Minimal dvt spec

The panel body for a nightingale rose chart. Add an id and title of your own; the sample data is inline, so it renders the moment you paste it into a dvt dashboard. Point it at your warehouse by swapping that sample data for a data block whose query returns the same shape.

roseType is a per-series passthrough key outside the dvt Core set, so this spec classifies as dvt Full: the spec-portability profile, not a separate product edition.

View spec

{
  "type": "chart:pie",
  "data": {
    "rows": [
      {
        "plan": "Enterprise",
        "revenue": 1048
      },
      {
        "plan": "Pro",
        "revenue": 735
      },
      {
        "plan": "Team",
        "revenue": 580
      },
      {
        "plan": "Starter",
        "revenue": 212
      }
    ]
  },
  "spec": {
    "legend": {
      "show": true,
      "position": "bottom"
    },
    "series": [
      {
        "type": "pie",
        "roseType": "radius"
      }
    ]
  }
}

Customize

Every control in dvt's edit tray writes a field of this spec, and the reference below lists every control and ChartSpec field this type accepts.

Everything you can set

Control	Layer	Where it lands
Data
Chart type	Core	`type`
Chart style	Core	`type`
Label column	Core	`spec.labelField`
Value column	Core	`spec.valueField`
Style
Slice colors	Core	`spec.categoryColors`
Nightingale (rose)	ECharts	`spec.series[].roseType`
Color scheme	Core	`spec.palette`
Conditional colors	Core	`spec.colorRules`
Labels
Show legend	ECharts	`spec.legend.show`
Legend position	ECharts	`spec.legend.position`
Show data labels	Core	`spec.label.show`
Label position	Core	`spec.label.position`
Format	Core	`spec.label.format`
Label value	Core	`spec.label.derive`
Rotate	Core	`spec.label.rotate`
Font size	Core	`spec.label.fontSize`
Label color	Core	`spec.label.color`
Tooltip	Core	`spec.tooltip`

Chart spec fields

Every chart type accepts these ChartSpec fields. Most are dvt spec fields the renderer compiles for you. grid passes straight through to ECharts; series mixes ECharts series options with dvt's dataField; and any key on xAxis, yAxis, legend, or tooltip that is not a documented dvt key passes through too.

Field	What it does
`xAxis`	One axis, or an array of axes, via `AxisSpec`: type, name, min, max, scale, log, and label formatting.
`yAxis`	Same shape as `xAxis`, for the value axis: type, name, min, max, scale, log, and label formatting.
`series`	Per-series overrides: `type`, `dataField`, `name`, `stack`, `smooth`, `itemStyle`, `lineStyle`, `areaStyle`, `label`.
`legend`	Show or hide the legend, set its position, and format an aggregated value shown next to each entry.
`tooltip`	Choose which fields appear, a totals row, field order, a custom template, and crosshair behavior.
`grid`	A raw ECharts grid box (`left`, `right`, `top`, `bottom`, `containLabel`), passed through unmodified.
`funnelRate`	Show a conversion-rate label on a funnel: `step`, `overall`, `total`, or `none`, with a `precision`.
`label`	Data labels: `show`, `position`, `format`, a derived value (percent of total, delta), rotation, size, color.
`gridlines`	Toggle and style gridlines per axis: `show`, dashed or solid `style`, `width`, and `color`.
`banding`	Alternating background bands along one axis, to make long rows or columns easier to scan.
`plotArea`	Set the plot area's background fill and border color.
`gridPadding`	Explicit `left`, `right`, `top`, and `bottom` padding around the plot area, each a number or a string.
`density`	Overall plot density: `comfortable` (default spacing) or `compact` (tighter margins).
`palette`	Name a registered color scheme to apply to the series, instead of the default categorical colors.
`categoryColors`	Map specific category values to explicit colors, overriding the palette for just those categories.
`colorRules`	Apply a color to a data point the first time one of its ordered `when` conditions matches.
`colorScale`	A continuous color scale (`sequential`, `diverging`, or `piecewise`) with a scheme, domain, and buckets.
`annotations`	Fixed or computed reference lines, bands, points, or text, placed at an axis value or a stat of a field.
`trendline`	Overlay a fitted trend line: `true` for a default linear fit, or an object naming the method and order.
`footnotes`	Up to 50 footnote entries, each a marker plus explanatory text, rendered below the chart.
`sourceNote`	A single line of source-attribution text rendered below the chart.

Build it in dvt

Every chart type on this site is a few lines of the same declarative JSON spec. Read the full spec format, or connect an AI agent to your warehouse and build one live in the quickstart.

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