Spiro curves and half-smooth nodes

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nastaliq
Posts: 5
Joined: Thu Jul 29, 2010 6:15 pm

Spiro curves and half-smooth nodes

Postby nastaliq » Tue Dec 10, 2013 8:45 pm

Hi everyone,

I am playing with Spiro curves in Inkscape to understand their behavior. On Google Books, I found some explanation about Spiro curves and tried to follow the example illustrated there. However, I cannot reproduce the behavior of the half-smooth nodes.

Here is what I drew, following the example I found in Google Books:

Image

Now, the book says that if a non-smooth node is next to a straight line segment, pressing Shift+S once makes it half-smooth. (Pressing Shift+S again will make the node full smooth.) I tried doing it to the cusp node (selected in the above image) so that the curve could transition into the line segment without a cusp (please see the image in the link to Google Books above). However, the node turned into a smooth node, even with a single press of Shift+S:

Image

Any ideas what I might be doing wrong?

(I am using Inkscape 0.48.4 r9939 on Windows 7.)

tylerdurden
Posts: 2344
Joined: Sun Apr 14, 2013 12:04 pm
Location: Michigan, USA

Re: Spiro curves and half-smooth nodes

Postby tylerdurden » Wed Dec 11, 2013 12:00 am

Seems the behavior is SHIFT+Y... maybe the keyboard mapping is off. Could be a windows thing... maybe they got flipped somehow?
Have a nice day.

I'm using Inkscape 0.92.2 (5c3e80d, 2017-08-06), 64 bit win8.1

The Inkscape manual has lots of helpful info! http://tavmjong.free.fr/INKSCAPE/MANUAL/html/

nastaliq
Posts: 5
Joined: Thu Jul 29, 2010 6:15 pm

Re: Spiro curves and half-smooth nodes

Postby nastaliq » Wed Dec 11, 2013 2:12 am

Shift+Y makes the node symmetric, right? In my case, it still turns the node into a smooth one, not half-smooth.

tylerdurden
Posts: 2344
Joined: Sun Apr 14, 2013 12:04 pm
Location: Michigan, USA

Re: Spiro curves and half-smooth nodes

Postby tylerdurden » Wed Dec 11, 2013 3:26 am

I can now confirm the issue... SHIFT+S makes full smooth, unless the node has at least one extended handle.

SHIFT+LEFT MOUSE DRAG on the node extends a handle, then SHIFT+S makes half-smooth.

WInXP
Inkscape 0.48.4 r9939
Have a nice day.

I'm using Inkscape 0.92.2 (5c3e80d, 2017-08-06), 64 bit win8.1

The Inkscape manual has lots of helpful info! http://tavmjong.free.fr/INKSCAPE/MANUAL/html/

nastaliq
Posts: 5
Joined: Thu Jul 29, 2010 6:15 pm

Re: Spiro curves and half-smooth nodes

Postby nastaliq » Wed Dec 11, 2013 2:31 pm

Ah. So, a non-smooth node needs to have an extended handle before Shift+S can make it half-smooth.

Thanks, tylerdurden. :)


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