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Re: a smooth curve through given points ?

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Peter Billam <peter@www.pjb.com.au> wrote:
> On 2016-08-15, John Forkosh <forkosh@panix.com> wrote:
>> Very nice. I tested it with various other x,y1...x,yn's,
>> and it seems to behave pretty nicely for the stuff I tested.
> 
> I found a bit of a problem when I tried
>  [ 250 300  240 400  260 390  250 600 ] points2curve stroke
> in other words with a short segment at an acute angle (around p4);
> I decided that in order to calculate p3 and p5 it's safer to
> scale with the _shorter_ of the two segments. So when I wrote that:
>  and I think if p1-to-p4 is a long segment and p4-to-p7 is a short
>  one, then it probably looks better if p3-to-p4 is reasonable in the
>  p1-to-p4 context, and p4-to-p5 reasonable in its p4-to-p7 context.
>  Needs trying out
> well I tried it, and it turned out luser.droog was right :-)
> So anyway, the currently quite useable version is rolled into
>  http://www.pjb.com.au/comp/line_drawing.html#points2curve
> as planned, and you can get it in
>  http://www.pjb.com.au/comp/free/line_drawing.ps.txt
> or in github:
>  https://github.com/peterbillam/postscriptlib
> but I can also post the new procedure here if people want ...
> I'll road-test it a bit over the next few days.

Thanks. I guess I didn't test it thoroughly (and wasn't really
sure where the "rough edges" that I'd want to thoroughly test are).
Please do re-post when you're satisfied with it (not necessarily
the procedure itself, but just the fact it's "ready for prime time").
Some of my "arty stuff" also does bezier, e.g.,
   http://www.forkosh.com/images/decorative/decorative8.jpg
and the corresponding .ps, which shows the /curvestep function.
I was thinking of maybe adding another such function based on
your points2curve, though at the moment I don't have any designs
in mind that would use it.

>> Like you, I put together some ps for "arty stuff" (your
>> words above), and you might find some of that useful. See
>>   http://www.forkosh.com/images/decorative/decorative13.jpg
>> for an example. Same_directory/decorative13.ps has all the ps.
> 
> Very nice :-)  With that kind of image, I always dream about
> gradually changing the parameters, generating hundreds of them
> (maybe 1600x900) and putting them together into a movie !
> (thinks: fame, fortune) but I never get around to it, though.
> Peter

Yeah, check out
   http://www.forkosh.com/images/decorative/decofweek.gif
and the corresponding .ps file. That's an animated gif design.
I used imagemagick  convert whatever.ps whatever.gif  to do that.
Each  %%Page: ... showpage  of the .ps gets interpreted as
a separate frame of the gif animation. Not exactly a movie,
but maybe accomplishes some of what you might be thinking.
-- 
John Forkosh  ( mailto:  j@f.com  where j=john and f=forkosh )

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a smooth curve through given points ? Peter Billam <peter@www.pjb.com.au> - 2016-08-12 08:10 +0000
  Re: a smooth curve through given points ? Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-08-12 01:12 -0700
  Re: a smooth curve through given points ? tlvp <mPiOsUcB.EtLlLvEp@att.net> - 2016-08-12 21:59 -0400
    Re: a smooth curve through given points ? tlvp <mPiOsUcB.EtLlLvEp@att.net> - 2016-08-13 22:42 -0400
  Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-12 21:49 -0700
    Re: a smooth curve through given points ? Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-08-12 21:59 -0700
      Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-12 22:21 -0700
      Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-18 15:01 -0700
        Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-19 13:10 -0700
          Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-19 13:13 -0700
    Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-12 22:00 -0700
    Re: a smooth curve through given points ? Peter Billam <peter@www.pjb.com.au> - 2016-08-13 09:44 +0000
      Re: a smooth curve through given points ? Peter Billam <peter@www.pjb.com.au> - 2016-08-15 01:00 +0000
        Re: a smooth curve through given points ? John Forkosh <forkosh@panix.com> - 2016-08-15 03:08 +0000
          Re: a smooth curve through given points ? Peter Billam <peter@www.pjb.com.au> - 2016-08-15 09:36 +0000
            Re: a smooth curve through given points ? JohnF <john@please.see.sig.for.email.com> - 2016-08-16 01:28 +0000
              Re: a smooth curve through given points ? Peter Billam <peter@www.pjb.com.au> - 2016-08-16 23:32 +0000
                Re: a smooth curve through given points ? tlvp <mPiOsUcB.EtLlLvEp@att.net> - 2016-08-17 01:07 -0400
    Re: a smooth curve through given points ? JohnF <john@please.see.sig.for.email.com> - 2016-08-14 06:17 +0000
  Re: a smooth curve through given points ? jdaw1 <jdawiseman@gmail.com> - 2016-08-16 03:14 -0700
  Re: a smooth curve through given points ? Alan <alan.isaac@gmail.com> - 2016-08-18 14:42 -0700
    Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-18 15:19 -0700
      Re: a smooth curve through given points ? Alan <alan.isaac@gmail.com> - 2016-08-18 18:52 -0700
        Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-18 21:47 -0700
          Re: a smooth curve through given points ? Alan <alan.isaac@gmail.com> - 2016-08-19 06:01 -0700
            Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-08-19 14:06 -0700
  Re: a smooth curve through given points ? luser droog <luser.droog@gmail.com> - 2016-11-03 22:03 -0700
    Re: a smooth curve through given points ? JohnF <john@please.see.sig.for.email.com> - 2016-11-05 05:19 +0000
    Re: a smooth curve through given points ? don lancaster <don@tinaja.com> - 2016-11-05 10:12 -0700

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