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Re: Rotating tick labels
- Subject: Re: Rotating tick labels
- From: davidf(at)dfanning.com (David Fanning)
- Date: Wed, 15 Nov 2000 11:41:59 -0700
- Newsgroups: comp.lang.idl-pvwave
- Organization: Fanning Software Consulting
- References: <email@example.com>
- Xref: news.doit.wisc.edu comp.lang.idl-pvwave:22203
TomC (firstname.lastname@example.org) writes:
> I am using IDL 5.4 to create PostScript files of plain old X-Y plots. Some
> of the plots have usernames as the x-axis tick labels. When there are lots
> of users, or long names and lots of users, the labels overwrite each other,
> creating an un-readable mess. Is there an easy way to have the tick labels
> created at an angle? Thanks in advance.
I have a short section in my book about how this can be done.
I was going to take it out of the 2nd Edition because I was
trying to save pages and I thought "who would ever need to
know how to do this?". But at the last minute I left it in.
You never know. :-)
Anyway, if you mean by "easy" some kind of keyword switch,
then the answer is "no". But is is not too hard either.
Suppose you are going to have 5 tick intervals, labeled
with 6 tick labels on the X axis:
numticks = 5
labels = ['One', 'Two', 'Three', 'Four', 'Five', 'Six']
Draw the plot, leaving some room for the rotated labels:
Plot, findgen(11), XTickFormat='(A1)', XStyle=1, $
XTicks=numticks, Position=[0.1, 0.2, 0.85, 0.95]
Calculate positions for the labels:
ypos = Replicate(!Y.Window - 0.04, numticks+1)
xpos = !X.Window + (!X.Window - !X.Window) * $
Findgen(numticks + 1) / numticks
Position the labels:
FOR j=0, numticks DO XYOutS, xpos[j], ypos[j], $
labels[j], Alignment=0.0, Orientation=-45, /Normal
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: email@example.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155