Class: Area Graph
This example shows an area chart created from five data points, with a smooth curved boundary filling the space between the baseline and the data values. The visualization uses D3 v4 to render an SVG path, mapping x and y coordinates through linear scales. The `d3.area()` generator sets the baseline at y=0 and defines the upper boundary using a basis curve for smooth interpolation. The code appends a single path element with the generated `d` attribute, producing a gray, thick-stroked filled region that visually represents the trend across the dataset.
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forked from <a href='http://bl.ocks.org/VirginiaHNg/'>VirginiaHNg</a>'s block: <a href='http://bl.ocks.org/VirginiaHNg/d458b01d4a1c13966b6fef702a50ce3f'>Class: Line Graph</a>