Color Scale

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Last edited Aug 9, 2018

Created on Aug 7, 2018

A sequential color scale maps a simple array of integers 0 through 39 to the PiYG interpolator, producing a smooth purple-to-green gradient across a single row of rectangular swatches. The visualization, built with D3 v5, uses `d3.scalePoint` to position each rectangle along the x-axis and `d3.scaleSequential` with `d3.interpolatePiYG` to assign its fill. Each rectangle’s width equals the point scale’s `step()`, creating a contiguous band. The rendered SVG highlights how sequential color scales encode ordered data, with the gradient clearly representing the numeric progression from low to high values.

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