An area chart is a line chart with the space beneath the line filled in, which emphasizes volume or magnitude as it changes over time.
Use an area chart when the size of the value matters as much as its trend - the filled region draws attention to volume, totals, or how much accumulated. A line chart is better when you only care about direction or are comparing many series.
A series of points with a category or date on one axis and a numeric value on the other, mapped through the CategoryProperty and ValueProperty of the area series.
Yes. Use stacked area to show how parts add up to a total, or full stacked area to show each part's share of 100%.
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