There is only one y1 and one y2 axis. Therefore it
doesn't make sense to have their definition in the
AggregateHandlers, because this would produce multiple
definitions for these axises.
The old method of creating brighter/darker colors was producing color
shades that did not look like the same color. E.g. a darker yellow
looked more like brown.
I am now trying to use hand crafted shades.
The drop down for plot types should only contain plot types that can
be combined. The reason is, that we can only draw images with two
x/y-axis. Therefore a combination of types that would need three or more
axis is not supported.
In the previous changeset the code that determined
which axis the plots used was implemented as a
side effect of getting the Gnuplot definition of
an axis.
Changed that to an explit update call with simpler
logic.
Gnuplot does not handle long x-axis ticks very good.
It should know how wide the labels are and could adapt
the increment size accordingly, but it doesn't.
Fixed by explicitly defining the increment for x-axis
labels.
We generate CSV files with comma as separator.
When we write times with milli seconds, then
we use floating point numbers. Depending
on the locale those floating point numbers
may be written with comma instead of point.
If that happens, then the plots are messed up.
Fixed by enforcing the locale when formatting floats.
This makes it easier to use the mouse wheel
to zoom in. Without it you could zoom into
a region that had not data and then had to
use the date picker to change the date.
