When working with smaller intervals it is difficult to see the
highlighted points when all the points are shown in black. This
patch adds a 'Frame Intervals' checkbox to enable the user to
turn off all the points when looking at specific intervals.
If no intervals are selected then this setting has no net effect.
All datapoints are shown.
Another rightclick menu for intervals, adding a bring to front and send to
back option but only when viewing the pfPvPlot, additionally the algorithm in
PfPv plot for determining which interval a point is used for has been adjusted
to fully populate every interval curve where appropriate (and incorrect
comments and redundant code have been removed).
IntervalItems now have a display sequence number so when you have
overlapping intervals you can bring to front and send to back on the
PfPv plot. The display sequence could be used on other plots if/when
they distinguish between intervals.
Previously, the coloring of intervals on PfPvPlot was determined solely
by the order they were defined which could be quite confusing.
The new intervals code removed some replots() to stop flickering but
they also removed critical refreshes after CP and Cadence values
are updated by the user using the entry fields on PfPvWindow.
Additionally, the setData() function was used to refresh all curves
when intervals were selected which caused user entries to be reset.
This patch introduces PfPvPlot::showIntervals() to only refresh the
intervals curve and fixes replots() to a) replot when neccessary
after a user entry but b) to not replot mid-refresh in the zones
background function.
The PfpvPlot::setData() function only sets the main curve (all the
black points).
When the user changes CP, CAD, CL in the window dialog they call
replot() explicitly rather than assuming the utility functions will
do it for them, since the utility functions are called within
setData (amongst others) and results in multiple replots() that are
ugly, but more importantly make it difficult to spot the deltas on
the plot as new intervals are overlayed because they all disappear
for a split second.
