How can i draw an envelope path with perfectly symmetric handles ?

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tylerdurden
Posts: 1908
Joined: Sun Apr 14, 2013 12:04 pm
Location: Michigan, USA

Re: How can i draw an envelope path with perfectly symmetric handles ?

Postby tylerdurden » Sun Jan 14, 2018 8:22 am

More food for thought...

Image
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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/

Moini
Posts: 2333
Joined: Mon Oct 05, 2015 10:44 am

Re: How can i draw an envelope path with perfectly symmetric handles ?

Postby Moini » Sun Jan 14, 2018 8:54 am

The issue is that here, we only want to apply the transformation in one axis, ignoring the length of the arc, and not assigning points on the top line to those one the bottom arc by using regular distances, but just by using a straight line downward.

I couldn't find any way that allows to separate these completely (Bézier envelope, Envelope Deformation LPE, Lattice deform LPE, even Bend LPE), aside from just using the good ol' node tool and moving nodes upwards with Ctrl manually.

If you do it like TD with the grid of squares, you'd need to measure the length of the bottom arc to know how wide the deformed thing needs to be at the bottom.
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tylerdurden
Posts: 1908
Joined: Sun Apr 14, 2013 12:04 pm
Location: Michigan, USA

Re: How can i draw an envelope path with perfectly symmetric handles ?

Postby tylerdurden » Sun Jan 14, 2018 9:19 am

Moini wrote:If you do it like TD with the grid of squares, you'd need to measure the length of the bottom arc to know how wide the deformed thing needs to be at the bottom.

The bottom arc length is easily known. But the amount of distortion I applied needed to be about 3x the difference between the length of the arc and the top line.

There must be a formula, but I haven't got it yet.
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/

Moini
Posts: 2333
Joined: Mon Oct 05, 2015 10:44 am

Re: How can i draw an envelope path with perfectly symmetric handles ?

Postby Moini » Sun Jan 14, 2018 9:42 am

Right, just tested. It's weird.
Something doesn't work? - Keeping an eye on the status bar can save you a lot of time!

Inkscape FAQ - Learning Resources - Website with tutorials (German and English)

tylerdurden
Posts: 1908
Joined: Sun Apr 14, 2013 12:04 pm
Location: Michigan, USA

Re: How can i draw an envelope path with perfectly symmetric handles ?

Postby tylerdurden » Sun Jan 14, 2018 10:17 am

Seems quite complex, and the unfortunate result (so far) is that while the lateral distortion is improved with perspective, the bottom arc of the object no longer fits the envelope. :(
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/

Moini
Posts: 2333
Joined: Mon Oct 05, 2015 10:44 am

Re: How can i draw an envelope path with perfectly symmetric handles ?

Postby Moini » Sun Jan 14, 2018 10:42 am

Maybe our math-savvy Lazur can guess what is happening?
Something doesn't work? - Keeping an eye on the status bar can save you a lot of time!

Inkscape FAQ - Learning Resources - Website with tutorials (German and English)


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