| Thick keyword [message #13996] |
Tue, 12 January 1999 00:00  |
Vapuser
Messages: 63
Registered: November 1998
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Member |
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This is for a { mipseb IRIX unix 5.1.1 Jul 20 1998}
Is it my imagination, or does the effect one gets in line plots using
'thick' seem to quantized in integers, so that thick=1 = thick=1.5 =
thick=1.999, but thick=2 is different?
Anyone else getting these results?
whd
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| Re: Thick keyword [message #14030 is a reply to message #13996] |
Tue, 19 January 1999 00:00  |
Med Bennett
Messages: 109
Registered: April 1997
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Senior Member |
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Are you talking about screen or postscript output? On my machine,
screen graphics seem to behave as though the thick value is rounded to
the nearest integer, while postscript output with real thick values
creates lines with proportional thicknesses (according to CorelDraw,
after importing):
thick line weight (inches)
0.2 .00129
0.4 .00207
0.6 .00286
0.8 .00365
etc...
Peter Clinch wrote:
>
> wmc@bas.ac.uk wrote:
>>
>> Vapuser <vapuser@catspaw.jpl.nasa.gov> wrote:
>>> Is it my imagination, or does the effect one gets in line plots using
>>> 'thick' seem to quantized in integers, so that thick=1 = thick=1.5 =
>>> thick=1.999, but thick=2 is different?
>>
>> What were you expecting? How can IDL draw fractions of a pixel?
>
> Anti aliasing, I'd have thought.
>
> Pete.
> --
> Peter Clinch Dundee University & Teaching Hospitals
> Tel 44 1382 660111 ext. 33637 Medical Physics, Ninewells Hospital
> Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
> net p.j.clinch@dundee.ac.uk http://www.dundee.ac.uk/~pjclinch/
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| Re: Thick keyword [message #14068 is a reply to message #13996] |
Fri, 15 January 1999 00:00 |
Joe[2]
Messages: 11
Registered: May 1998
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Junior Member |
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> This is for a { mipseb IRIX unix 5.1.1 Jul 20 1998}
>
> Is it my imagination, or does the effect one gets in line plots using
> 'thick' seem to quantized in integers, so that thick=1 = thick=1.5 =
> thick=1.999, but thick=2 is different?
>
> Anyone else getting these results?
That does seem to be what happens on my hardware (PC) too.
I can't recall whether it is also true for output to a printer. You
may appear to have fine control over the line thickness on a printer
because the native units (or pixels/texels) are so much smaller.
But it is probably still quantized.
Yet another problem in developing a WYSIWYG interface for
IDL graphics.
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