Remove before add

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Remove before add

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Last edited Mar 27, 2019

Created on Mar 27, 2019

Two buttons switch between two datasets, each displayed as a grid of small squares that grow or shrink to represent a numeric block count. Changing datasets triggers a D3 v4 transition where exiting squares shrink and are removed before entering squares expand, creating a staged reveal. The color of each square updates from light gray to a value mapped through `d3.scaleThreshold`, while an annotation text fades to match the event name. All rendering uses D3 selections, `transition.attr`, and `transition.remove` on SVG `rect` elements.

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forked from <a href='http://bl.ocks.org/pybern/'>pybern</a>'s block: <a href='http://bl.ocks.org/pybern/4b4b73dbd47ec40e3b5ca7971dce1a36'>Remove before add</a>

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