White Rabbit CAD

No you did'not! So it's will be ultra cool to have Import / Export PDF!

Yep but Half Arcs are more painfull to make than a circle!
i must enter -180°

Another thing : it's not possible to have the direct numeric enter ? (for the Arc for example)
Now i must click to the Numeric box...(sorry i have bad habits of facilities...

And i have not the final Right Red disc in this case! ?
I have it when i cross another curve but not an auto-vertex!

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[Taron]

I can't even tell what you're doing there?!
Use Shift!
Start the arc by placing the center and then hold shift to set the start and end of the arc. It will snap to 180 degree (and 90 and 270 and so on)

[Taron]

Here, Pilou...
Set Center, hold shift and drag to start of arc, keep holding shift and go to end of arc. Click, done!

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[Taron]

Here's an extract with a manual spread. In case of arcs, the Spread and Pivot features don't quite work well, because they're not designed to handle already radial segments. They are very complicated pieces of code, which can and spread pieces most commonly modified with them in usual pattern construction.
Anyway, it's easy as pie to manually cut and spread an arc based patternpiece...

I should add that I did not plan for it, which is why I then went onto the first (original) "layer", subdivided the two arcs in 8 segments each. Then went into the new "layer" (We will call those "Sheets" eventually!) and made the first one visible in the background to be able to snap to those segments.
Then I used "Cut" to cat the patternpiece. Then Rotate and manually entered -2 degree for each rotation. Then just rotated the whole thing back to look prettier, hehe...

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[Taron]

PAHA! I did not even expect this to work so well, but here's just using Pivot!
Of course, I already had those subdivisions on the arcs and then just drew line between them. At this point the arc is still solid with only inner lines as markings!
"Pivot" will automatically cut and spread the pieces, while I set the upper spread to 1cm and the lower to 3cm.
This could hardly be any more simple, but I'm a little surprised it worked, hehehe...( Real Time, by the way, no editing!)

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[Taron]

OH, SNAP, hahahaha... get a load of this:

Pivot with automatic box-pleats! These are complicated folds that stand the test of time.

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Yes I have discovered some of these...terrific indeed! i was just susprised that the red disc don't work with my rotative one above!

The more amazing is the Transfert Dart at each time that transform entierely the Pattern!

And yes Pivot is very useful for push the walls!

I am a little perplex about you second video... your arcs are suddivided yes
and seems you use different "layers" but when you draw radial lines we don't see the crosses for the radial line start end ?
It's due to the record prog or there is something... a tolerance (?) ...a pressed key for snap on them without see it or ...

Method of "marks" following is not practical ?

Another thing : there is something for block horizontally the drawing ?
as you see on the following image it's hard to have the horizontal!

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Say for any reason i miss a Pivot...
if i make it a new all the rest disapears!

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[Taron]

Shouldn't be hard, just hold shift as you drag!
I have not used marks for the subdivisions. I did split the arc subdivisions.
The patternpiece (polygon) was added to a new tab ("layer"). To make the first layer visible in the background, you right click on the layer tab, which brings up the little menu:

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What confuses you about your example there is a different problem. It's a little bit challenging to explain, but one real weakness/wackiness in the system. Although you can have multiple polygons in one patternpiece, certain operations only work on single polygons and will ignore the remaining polygons when it creates the new patternpiece.

Pivot, Spread, Cut and Dart will create new patternpieces.
If an original patternpiece has more polygons, but you use the above operation on one of them, the new patternpiece they will create will only have the result of the chosen polygon in them.
I will try to find an elegant solution for that later on.