On Saturday 20 July 2024 at 07:42:39 UTC+10 [email protected] wrote: I don’t fully understand the `line_gap_fraction` option. But I seem to remember that `None` values will always cause a break in the plot…
line_gap_fraction does seem a little mystical in operation but once you understand how it works it is fairly easy to use. Think of line_gap_fraction as the proportion of the overall x-axis timeframe that the plot engine considers to be a gap in data. So for a typical day plot (27 hours or 97200 seconds) a line_gap_fraction of 0.05 means that any gap in time between successive plot points of 4860 seconds (81 minutes) or longer will be considered a gap and result in a gap in the plotted line. If line_gap_fraction = 0.01 the gap drops to 16.2 minutes. So for data with a 15 minute archive period a line_gap_fraction = 0.01 will plot a continuous line provided there are no missing points. Any missing points result in a gap of at least 30 minutes so line_gap_fraction = 0.01 will result in gaps. In this case a line_gap_fraction = 0.02 or greater is required. The default line_gap_fraction = 0.05 should work fine. If it is not then something else is amiss (first thing that springs to mind is the possibility that line_gap_fraction is being overridden somewhere in the respective skin.conf or weewx.conf). The same applies for week, month and year plots, but you now apply line_gap_fraction to a much longer overall x-axis timeframe meaning the gap in seconds for a given line_gap_fraction value is greater . Also, week, month and year plots by default plot an aggregate so the data points are now spaced every 'aggregate interval' seconds and not necessarily every 'archive period' seconds. Also, when line_gap_fraction is omitted (or set to a value <0 or >1) any missing data points will be considered a gap and plotted as such. In this case you definitely do not want to omit line_gap_fraction or you will always have gaps. Gary -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/13ad33a5-8a38-4026-9181-54cf9194c808n%40googlegroups.com.
