| Re: Coyote Graphics PS/PDF output size/orientation [message #85505 is a reply to message #85504] |
Tue, 13 August 2013 21:47   |
Paul Levine
Messages: 29
Registered: February 2008
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Junior Member |
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On 2013-08-14 03:51:04 +0000, David Fanning said:
> Paul Levine writes:
>
>> Also, I am quite interested in your take on the PNG files I wound up
>> with, where the pixel size of the files was quite different from the
>> xwsize and ywsize specified, and some axis titles and labels were cut
>> off. I don't how related this is to the PDF issue, so if you can only
>> deal with one of these issues at a time, then perhaps you need to pass
>> the other one off to Coyote and see where he gets with it ;-)
>
> Yeah, I'll talk to Coyote about this, but he has me drinking gin and
> tonics tonight to celebrate something or other. It will have to be in
> the morning. Oh, I remember, birthdays! We'll sort it out in the
> morning. :-)
>
> Cheers,
>
> David
Ah, well, in that case, happy birthday! I hope for your sake that you
don't see this message until tomorrow morning, but once you do, I have
something interesting to report on PNG conversion. It seems that to a
certain extent, cgps2raster creates PNG files of a certain size that is
determined by the aspect ratio rather than the wxsize/wysize or the
cgControl resize keyword. So, for example, any aspect ratio of 4:3
will produce a PNG of 742 x 556 pixels, and any aspect ratio of 1:1
will prodice a PNG of 573 x 573 pixels.
So when I appended my code with the following lines:
cgControl, Resize=1, Output='Resize_1x1.png'
cgControl, Resize=50, Output='Resize_50x50.png'
cgControl, Resize=800, Output='Resize_800x800.png'
cgControl, Resize=8000, Output='Resize_8000x8000.png'
cgControl, Resize=25000, Output='Resize_25000x25000.png'
each of the resulting PNG files was 573 x 573 pixels.
Now, here's where it gets really interesting. I said "to a certain
extent" before because once the size is above a certain threshold, then
a different sized file is produced. Resize=32767 and any number below
gives me the 573 x 573, but Resize=32768 and any number above that
produces a PNG file that is 742 x 390 pixels . Of course, it can't be
a coincidence that the threshold I did pinpoint is the 15th power of 2.
Just for laughs, I decided to try finding out whether there was an
even higher threshold. So I tried Resize=2.14748e+09 (2^31), which was
still 742 x 390, then I tried to go even higher than that and ended up
getting a "Floating illegal operand" error from cgPlot. So I guess
cgPlot is not able to handle more than about 2.14748 x 2.14748 billion
pixels ;-P
Tomorrow, I will hopefully have access to a windows machine, which I
can use for testing
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