https://bugs.freedesktop.org/show_bug.cgi?id=36779

--- Comment #22 from Diggory Hardy <[email protected]> ---
Mr Faure,

> That said what is the usefulness of drawing a chart with 100k points when you
> have a number of pixels on the width of your screen less than 2% of these 
> 100k?

Maybe one has a long time series (for example, the x-axis being a time step and
the y-axis being a count of events or parasite density in the blood or some
such). In this case being able to get a rough view of the chart can be
important even though the user will obviously not be able to read off the exact
time (on the x-axis) of some feature in the plot.

Note that in such a plot it probably makes sense to somehow reduce the number
of points before drawing the graph, but you can't simply sample some points and
ignore the rest since that could ignore a rare event in a long series.

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