Scale
A visualization scale maps data values to visual values such as positions, colors, or sizes.
D3.js in Action, Third Edition
A scale maps data values to visual values such as size, color, or screen position.
- How it is used
- Translates prepared data into visual attributes while constructing D3 charts.
- How deep it goes
- Defines domains, ranges, continuous values, and discrete values, then demonstrates scaleLinear without covering every scale family.
- Examples
- Uses bar charts, TV-series ratings, gendered salary box plots, scatterplots, and a scaleLinear mapping from 0–200 to 0–20.
- What you can do after
- Apply it via D3 by configuring a domain and range, evaluating the scale, and assigning outputs to chart attributes.
Data Storytelling with Altair and AI
A visualization scale maps data values to visual values such as positions, colors, or sizes.
- How it is used
- Maps data values to visual outputs, especially colors, while constructing readable Altair charts.
- How deep it goes
- Defines domains, ranges, and schemes with examples, but stops short of explaining scale internals.
- Examples
- Uses category-colored bars, quantitative blue-to-red mappings, and country lines colored with the set2 scheme.
- What you can do after
- Apply it via Altair to configure color palettes, domains, and ranges for encoded chart values.
Read how Data Storytelling with Altair and AI explains scale →
Related concepts
- range()configured by · range() is a visualization-scale method or parameter that sets or specifies the scale’s output values.
- axis generatorused by · An axis generator is a D3 function that constructs SVG elements representing a chart axis from a scale.
- ordinal scaleincludes · An ordinal scale maps discrete domain values to discrete range values while preserving their categorical association.
- scaleLinear()includes · scaleLinear() is a D3 scale function that maps continuous numeric input values to continuous numeric output values.
- linear scaleincludes · A linear scale maps continuous input values to output values through a linear relationship between its domain and range.
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