vsup

Value-Suppressing Uncertainty Palettes (VSUPs)

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Code for generating Value-Suppressing Uncertainty Palettes for use in D3 charts. Read more about VSUPs in our introductory blog post and our research paper.

Examples

These examples are served from the examples directory.

• Flights
• Polling
• Virology

Citation

If you use this module for a publication, please cite VSUPs as:

@inproceedings{2018-uncertainty-palettes,
 title = {Value-Suppressing Uncertainty Palettes},
 author = {Michael Correll AND Dominik Moritz AND Jeffrey Heer},
 booktitle = {ACM Human Factors in Computing Systems (CHI)},
 year = {2018},
 url = {http://idl.cs.washington.edu/papers/uncertainty-palettes},
}

Installation

yarn add vsup or include the library directly from jsdelivr as https://cdn.jsdelivr.net/npm/vsup.

<script src="https://cdn.jsdelivr.net/npm/vsup@latest"></script>

Usage

Quantization <>

A quantization defines how values or objects of the form {u: number, v: number} (uncertainty and value) are quantized. They are used instead of a domain in VSUP scales.

This module supports three different quantizations: linearQuantization, squareQuantization, and quantization.

vsup.linearQuantization

This is a wrapper around d3.scaleQuantize.

vsup.squareQuantization

Defines a quantization into a rectangular matrix of value and uncertainty.

The constructor takes a single argument n, the number of rows and columns.

var q = vsup.squareQuantization(3);

q is then a function that can be used to discretize uncertainties and values.

> q(0.2,0.1);
{u: 0, v: 0.16666666666666666}

The quantization has the following methods:

• range
• n
• matrix
• data
• uncertaintyDomain
• valueDomain

vsup.quantization

Similar to squareQuantization but creates a tree quantization. The constructor takes two arguments branchingFactor and treeLayers.

The quantization has the following methods:

• range
• branching
• layers
• tree
• data
• uncertaintyDomain
• valueDomain

Scales <>

The interface to create a scale mirrors scales in D3. The difference of VSUP scales is that they use a quantization instead of a domain. The range can be set to any color range.

The constructor takes three optional arguments: mode (usl, us, ul), range, and quantization. It returns a function that takes two arguments value and uncertainty.

For example

var s = vsup.scale();

s is now a function that takes two arguments

> s(0.8, 0.1);
"rgb(137, 214, 99)"

The scale has the following methods:

• range to get or set the color range (e.g. d3.interpolateViridis)
• colorList
• colorDists
• mode
• quantize

Legends <>

This module implements three kinds of legends (simpleLegend, heatmapLegend, and arcmapLegend) corresponding to the three quantization types.

To add a legend to the DOM, create a legend and attach it to an element. For example:

var legend = vsup.legend().arcmapLegend();
svg.append("g").call(legend)

You can find example code in test/legend.html.

vsup.legend.simpleLegend

A simple legend for linear quantizations.

vsup.legend.heatmapLegend

A rectangular legend for tree quantization or square quantization.

vsup.legend.arcmapLegend

A legend for a tree quantization.

Developers

Make a new release

• Test the examples in test
• yarn version
• npm publish
• git push --tags

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