| Re: String length when FONT=1 [message #29159 is a reply to message #29094] |
Fri, 01 February 2002 11:32  |
Paul van Delst
Messages: 364
Registered: March 1997
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Senior Member |
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Paul van Delst wrote:
>
> Andrew Cool wrote:
>>
>> Paul van Delst wrote:
>>>
>>> Hey there,
>>>
>>> Anyone know how to determine string length in normalised units when you're using truetype
>>> fonts?
>>>
>>> Currently I have:
>>>
>>> ch_size = CONVERT_COORD( !D.X_CH_SIZE, !D.Y_CH_SIZE, /DEVICE, /TO_NORMAL )
>>> x_ch_size = ch_size[ 0 ] * charsize
>>> x_length = STRLEN( my_string ) * x_ch_size )
>>>
>>> which works great for the regular on-screen hershey type of fonts, but not for proportional
>>> fonts.
>>>
>>> any ideas? what I want to do is blank out the plot behind the text, e.g. like for legends etc.
>>>
>>> paulv
>>
>> Hiya Paul,
>>
>> Does the Width keyword to XYOUTS not help? e.g. :-
>>
>> XYOUTS, x, y, string, WIDTH=thisWidth, CHARSIZE=-1
>>
>> Charsize of -1 suppresses printing to the window, and the variable
>> thisWidth returns the width of the string in normalized coordinates.
>
> Hmm...this does not seem to work as advertised on my system.
>
> IDL> print, !version
> { x86 linux unix 5.4.1 Jan 16 2001 32 32}
>
> The following is what I get for the string lengths via the XYOUTS with font=1:
>
> Level ppmv 0.0484790
> ppmv->cd->corr.ppmv 0.0991605
> corr-nocorr ppmv 0.0736377
> corr-interp ppmv 0.0700989
> nocorr-interp ppmv 0.0809504
>
> oh so incorrect.
Aha! Must scale the result by whatever the charsize value is for the ACTUAL string. Cool. Still
- it's a bit silly to have to use xyouts twice.... or maybe not.
paulv
--
Paul van Delst Religious and cultural
CIMSS @ NOAA/NCEP purity is a fundamentalist
Ph: (301)763-8000 x7274 fantasy
Fax:(301)763-8545 V.S.Naipaul
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