JPGraph - setting Y axis range and calculating left margin width?

[johnbkim]

I'm using JPGraph to plot temperature vs. time. Time is given as
timestamps, so I use a callback function to print it as hours and
minutes. Here's the graph and the code:

http://fs.sdsu.edu/kf/vorb/test.php

Because I print the X axis labels (time) at 90 degrees, I have to
manually set the bottom margin, which forces me to set the left margin
too, which used to be automatically set.

My questions:

1. How do I calculate left margin at run time, based on the width of
the Y axis tick labels?
2. I'm setting the X axis scale to go from $t0 to $t1, but why isn't
it ending right on the hour?
3. How do I set the X axis tick intervals to 30 or 60 minute
intervals? (I tried $graph->xaxis->SetTickLabelInterval()).

Thanks.

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[johnbkim]

2. I'm setting the X axis scale to go from $t0 to $t1, but why isn't

it ending right on the hour?
3. How do I set the X axis tick intervals to 30 or 60 minute
intervals? (I tried $graph->xaxis->SetTickLabelInterval()).

I stumbled upon the answer:
// set major ticks to 60 mins, minor to 15 mins.
$graph->xaxis->ticks->Set( 60*60, 60*15 );

This also fixed the problem of X axis scale not going all the way to
$t1. Not sure why, but it works now after I added the above line.

j.