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Stacked Bar

Basic Configuration​

The Stacked Bar component has been designed to work together with XY Container. The minimal Stacked Bar configuration looks like:

component.tsx
import { VisXYContainer, VisStackedBar } from '@unovis/react'

function Component(props) {
  const data: DataRecord[] = props.data
  const x = (d: DataRecord) => d.x
  const y = (d: DataRecord) => d.y

  return (
    <VisXYContainer data={data}>
      <VisStackedBar x={x} y={y}/>
    </VisXYContainer>
  )
}
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Multiple Stacked Bars​

Stacked Bar can accept an array of y accessors to display values as a stack of bars:

component.tsx
import { VisXYContainer, VisStackedBar } from '@unovis/react'

function Component(props) {
  const data: DataRecord[] = props.data
  const x = (d: DataRecord) => d.x
  const y = [
    (d: DataRecord) => d.y,
    (d: DataRecord) => d.y1,
    (d: DataRecord) => d.y2
  ]

  return (
    <VisXYContainer data={data}>
      <VisStackedBar x={x} y={y}/>
    </VisXYContainer>
  )
}
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Orientation​

Stacked Bar supports horizontal and vertical orientation.

<VisStackedBar orientation="horizontal" x={x} y={y}/>
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Rounded Corners​

You can apply rounded corners to the top bar in your Stacked Bar component using the roundedCorners property, which accepts either a number (in pixels) or boolean argument.

<VisStackedBar roundedCorners={true} x={x} y={y}/>
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Bar Color​

Set the color of each bar by assigning the color property to a color string, a color accessor function or an array of color strings.

Stacked Bars​

For stacked data, use an array of values or a single callback function.

// Either of these work
const colors = ['red', 'green', 'blue']
const color = (d: DataRecord, i: number) => ['red', 'green', 'blue'][i]
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Non-Stacked Bars​

If you want non-stacked data (i.e. single bars) to display variable colors, you can use a single color accessor. The following sets the color based on the value of y:

const color = (d: DataRecord) => d.y > 7 ? '#FF4F4E' : '#1acb9a'}
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Bar Sizing​

Bar Width​

By default, the width of the bars is calculated automatically based on their count. But you can also strictly set the bar's width in pixels using the barWidth property:

<VisStackedBar barWidth={5} x={x} y={y}/>
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Limiting Dynamic Bar Width​

When you don't know the number of bars in advance, and you're relying on automatic bar width calculation, you might want to limit the maximum bar width to prevent the bars from being too wide when there are just a few of them. That can be achieved by setting the barMaxWidth property.

Bar Padding​

Another way to control the bar's width is by changing the barPadding property, which specifies how much of the available sector should be empty, in the range of [0,1).

<VisStackedBar barPadding={0.5} x={x} y={y}/>
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Minimum Bar Height​

When you have highly scattered data with very low and high values, the bars corresponding to the lower values can be so small, so they become invisible. If you want to prevent that you can set the minimum bar height to 1 pixel using the barMinHeight1Px boolean property.

<VisStackedBar barMinHeight1Px={undefined} x={x} y={y}/>
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Preventing Overlaps with dataStep​

When your data has gaps, it's impossible to do calculate of the bar width automatically. The visualization will still try to do that, but most likely the result will be wrong, and you'll see wide overlapping bars. However, you can help the calculation by setting your data step implicitly using the dataStep property. Consider the following example, with data mainly clumped in the domain 0 < x < 1:

<VisStackedBar x={x} y={y}/>
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<VisStackedBar x={x} y={y} dataStep={0.1}/>
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Ordinal Data​

Read our guide about using ordinal/categorical values with XY Components here

Events​

import { StackedBar } from '@unovis/ts`
...
events = {
    [StackedBar.selectors.bar]: {
        click: (d: DataRecord) => {},
        ...
    },
    [StackedBar.selectors.barGroup]: {
        mouseover: (d: DataRecord[]) => {},
        ...
    },
}
<VisStackedBar x={x} y={y} events={events}/>

CSS Variables​

The Stacked Bar component supports additional styling via CSS variables that you can define for your visualization container. For example:

styles.css
.custom-stacked-bar {
  --vis-stacked-bar-stroke-color: #000;
  --vis-stacked-bar-stroke-width: 5px;
  --vis-stacked-bar-hover-stroke-width: 10px;
  --vis-stacked-bar-hover-stroke-color: #8777d9;
}
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Supported CSS variables and their default values
--vis-stacked-bar-cursor: default;
--vis-stacked-bar-fill-color: var(--vis-color-main);
--vis-stacked-bar-stroke-color: none;
--vis-stacked-bar-stroke-width: 0px;
--vis-stacked-bar-hover-stroke-width: none;
--vis-stacked-bar-hover-stroke-color: none;
 
/* Dark Theme */
--vis-dark-stacked-bar-stroke-color: none;

Component Props​

NameTypeDescription
* required property