simple line chart from dataset
This example shows a simple line chart of monthly values from a JSON dataset, with interactive circles and date labels. The chart maps categorical month names to an ordinal x-scale and numeric values to a linear y-scale, rendering the line as an SVG path. Hovering over a circle or date label triggers animated transitions, enlarging the element, displaying a tooltip with the value, and drawing a temporary dashed vertical line via d3.svg.line and d3.select.append. The visualization uses D3 v3, SVG for rendering, and transitions for mouseover effects.
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forked from <a href='http://bl.ocks.org/romsson/'>romsson</a>'s block: <a href='http://bl.ocks.org/romsson/855207ac5fb5c170de59b9c69ea56012'>simple line chart from dataset</a>