[time-nuts] Lady Heather Display Question....

Mark Sims holrum at hotmail.com
Sat Jul 4 15:36:23 UTC 2009


The space marked #2 is due to the way the graph scales in 24 hour mode.  You get 24 major divisions with 15 minute ticks.  The divisions were set up so that time maps consistently to screen pixels (i.e. no rounding or dithering issues).  1024x768 mode uses 960 (24x40) pixels to display the plot.  If the graph completely filled the space each hour would need 42.67 pixels.  There is enough space there for another hour of data,  but then it would be a 25 hour plot...

The space marked #1 is a bit of a problem.  If you have a Thunderbolt E,  part of that space is taken up by the extra satellites that it can track.  In the 800x600 mode that space is just not there.  Also,  the DOS/WIN98 version of the program uses a 8x16 font,  so even in 1024x768 mode that space is much smaller (and totally used with a tbolt-E).  A clock display would need to accommodate these issues.

The oadev plots are already set up so that each major horizontal division is one tau step (1-2-5).  Notice that each group of three major horizontal divisions is highlighted in the plot...  these are the decade divisions.

The oadev plot vertical scale is set up so that each pair of major divisions is a decade (the top line of the plot is 1E-9).  Those lines are highlighted (the first highlighted division is 1E-10).

The minor vertical ticks in the oadev plot represent the first digit of the mantissa of the value.   So basically the vertical scale is logarithmic by decade,  and linear within each decade.

Unfortunately, if you took enough space to label the plot axes,  the graphs get rather cramped and confusing.  The osc/pps/temp/dac graphs do have the (vertical scale factor) and  values indicated.  A '~' means that that value is dynamically calculated.  An '=' means that that value is fixed.

The latest version will support an optional polar az/el/signal level plot.  You can either place it where the adev tables are now or at the right end of the plot area (and the 24 hour plot turns into a 12 hour plot).


----------------------

I took a screen shot showing the area Mike is talking about with a big red X
and a #1.   I noticed also that in this shot that there is another block of
unused space when changing to the 24 hour plot.  I have this marked with a
big red X and a #2 in the attached photo.--------------
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