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D3: Adding values and elements to a chart

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SS-trunk
Last edited Jun 26, 2017
Created on Jun 23, 2017

A button click triggers animated transitions for a set of circles plotted against linear x- and y-axes. The chart initially displays points from a fixed data array, then swaps their coordinates and colors in two sequential transitions, cycling in a loop. Built with D3 v4, it uses SVG circles, `d3.scaleLinear`, `d3.axisBottom`, and `d3.axisLeft`, with chained `transition` calls and delays to orchestrate the repeating visual update.

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