#7 Help: Get time&date on the x-axis.

[Andrew Wilkin]

Hi George,

I'm new to Tcl/Tk and BLT for that matter. I would like
some help in being able to get the x-axis to have a Date
and Time vaule. I'm after a result that would have the
time in hourly increments and the date for that time
below. eg time and date for the x-axis

00:00 06:00 12:00 18:00 00:00 06:00
21/06/2002 22/06/2002

Hope you can understand what I mean above.

The value that I would use to calculate the time& date
would be in the form of 'clock seconds'.

I would think that somebody would have done something
like this in the past, but I don't seem to be able to track
anything down on the Web.

Thanks for any assistance.

Andrew

[Daniel O'Connor]

Logged In: YES
user_id=3009

The way I did this was to use a custom label formatter like
so ->
proc time_axis_fmt {w t} {
global state;

set ttime [expr int($t * $state(binsize) +
$state(fromsec1))];
return [clock format $ttime -format "%H:%M, %d %b" -gmt 1];
}

...
graph $state(graphframe).g;
$state(graphframe).g xaxis configure -command
time_axis_fmt -title "Time (UTC)" -subdivisions 0;
...