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Re: character size in normal coordinates [message #13619 is a reply to message #13616]

Mon, 23 November 1998 00:00

Martin Schultz
Messages: 515
Registered: August 1997

Senior Member

David Fanning wrote:

> Martin Schultz (mgs@io.harvard.edu) writes:
>
>> My guess would be :
>>
>> pixsize = !d.y_ch_size * !p.charsize ; or your own charsize --> gives
>> size in pixels
>> normsize = convert_coord(pixsize,/device,/to_normal)
>> UGLY! That doesn't work! Well, then
>> normsize = pixsize/!d.y_size
>
> Careful here. The expression:
>
> normsize = pixsize / !D.Y_Size
>
> is going to evaluation to 0, almost always. :-)
>
> Try:
>
> normsize = pixsize / Float(!D.Y_Size)
>
> This one has bit me enough that I almost always
> remember it. :-)
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting
> Phone: 970-221-0438 E-Mail: davidf@dfanning.com
> Coyote's Guide to IDL Progamming: http://www.dfanning.com/
> Toll-Free IDL Book Orders: 1-888-461-0155

Ouch !! But ... if you use !p.charsize you already have a float variable.
IDL> help,!p,/stru
[...]
CHARSIZE FLOAT 1.40000
[...]

Martin

--
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Dr. Martin Schultz
Department for Engineering&Applied Sciences, Harvard University
109 Pierce Hall, 29 Oxford St., Cambridge, MA-02138, USA

phone: (617)-496-8318
fax : (617)-495-4551

e-mail: mgs@io.harvard.edu
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[Message index]

		Re: character size in normal coordinates By: David Foster on Tue, 24 November 1998 00:00
		Re: character size in normal coordinates By: davidf on Mon, 23 November 1998 00:00
		Re: character size in normal coordinates By: David Foster on Mon, 23 November 1998 00:00
		Re: character size in normal coordinates By: Martin Schultz on Mon, 23 November 1998 00:00
		Re: character size in normal coordinates By: davidf on Sun, 22 November 1998 00:00
		Re: character size in normal coordinates By: Martin Schultz on Sun, 22 November 1998 00:00

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