Sketcher Hyperbola Support

[abdullah]

Ok. I have just finished rebasing the old work to current master:

https://github.com/abdullahtahiriyo/Fre ... ola_2016_2

I have been trying to remember where we were...

CURRENT STATUS:

I. Creation, moving of endpoints

It sometimes crosses the endpoints, so that one endpoint is drawn on the other side of the origin, e.g.:

hyperbola_endpoints_switched_on_creation.png (3.58 KiB) Viewed 2248 times

when on the drawing, this can be fixed by dragging one endpoint by the origin to "overtake" the other endpoint.

Sometimes during the moving a created hyperbola the edge jumps to generate the previous situation.

You get more or less jumping and this kind of issues depending on the solver you have selected (Dense,Sparse,LM,DL,...)

II. Tangent/perpendicular constraints are not yet implemented

III. Deletion of all internal geometry when deleting an hyperbola

IV. An icon for Arc of hyperbola creation by center (O), major radius (a), first endpoint, second endpoint

Then also the icons for the Elements widget...

I think there were some icons for hyperbola made by jmaust a time ago... I will take a look...

More or less, this can be done as for today:

hyperbola_show.png (20.92 KiB) Viewed 2248 times

The most worrying part is I, because it is what makes it look edgy. I still have to take some more time to work with it, debug it, and surely more issues will arise...

[triplus]

Hello @abdullah and welcome back.

P.S. As for the work you already started doing looking good.

[hinckel]

And here is my wish for the parabola segment.
I want to draw a parabola defined by two points; p1 and p2 and the tangent lines to the parabola at these same points.
Should it help, the math for working this out is presented in pdf attached.(It is in portuguese and I hope the derivation is
understandable. If a translations is needed please let me know.)
Oops. Looks like pdf files may no be attached. will email it.)

[sgrogan]

Hi guys,

I am slowly getting into pace again.

I had missed this. Welcome back abdullah! I hope your doing well

[abdullah]

Hello @abdullah and welcome back.

I had missed this. Welcome back abdullah! I hope your doing well

Thanks guys!

And here is my wish for the parabola segment.

I intend to implement parabola after hyperbola is finished. BTW, you can make a zip of any file extension and upload the zip (as far as size it is ok).

I has done some work today.

1. First I missed the icons, so I took Jim's icons from page 2 of this thread, modified them to define the center instead of the focus, and integrated them:

Hyperbola_create.png (3.8 KiB) Viewed 2156 times

Hyperbola_create1_constr.png (3.8 KiB) Viewed 2156 times

I also added the code to make the widget element work:

Hyperbola_widget_element.png (27 KiB) Viewed 2156 times

Then I implemented curve to hyperbola tangency (not line to hyperbola yet), using the via point method:

Curves_tangent_to_hyperbola.png (11.75 KiB) Viewed 2156 times

I also updated the branch in GitHub:
https://github.com/abdullahtahiriyo/Fre ... ola_2016_2

[abdullah]

Just pushed to the branch the perpendicular constraint...

I forgot to put a point-to-point tangency in the previous image, so I added it to this one...

Hyperbola_perpendicularity.png (10.78 KiB) Viewed 2148 times

From the constraints, I think that the only one missing ATM is line tangent to arc of hyperbola (other than in an endpoint).

[abdullah]

Line-tangent-hyperbola:
(work in progress)
First of all, I was wrong (looks like so) when I posted that my famous mirroring technique is not valid for hyperbola... Looks like it just is:
Err = |F2_m - F1| - 2*a
However, there is a problem. It will be valid for both branches, which is bad. I have not come up with a nice way to lock this technique to a branch, so the question is open.

I can not think of a way of locking it to a branch... unless we use a point, so forcing the tangency to be a tangency via point. This is working at the moment with the 3 elements selection tangency (select hyperbola, line and a point a click tangency)...

Hyperbola_line_tangency_on_curve.png (9.96 KiB) Viewed 2146 times

Any ideas?

[DeepSOIC]

Oops. Looks like pdf files may no be attached

I moved hinckel's post with pdf attachment about parabola math to parabola thread.

[abdullah]

Hi all!

Finally I have got a couple of hours to look into the problems we had with the Hyperbola. Sorry for the looong delay. I have been very busy.

1. I (think I) have managed to fix the reversing of the endpoints with respect to the edge (on construction and afterwards when dragging the curve).
2. I have implemented the autoconstraints on the endpoints.

Branch:
https://github.com/abdullahtahiriyo/Fre ... ola_2016_2

Status:
- I think the hyperbola support is usable.
- I am aware that the creation process often does not create the hyperbola that a user would expect.
- Other than that, I think no major issues exist.

Request for testing:
- I do not have much time available lately and it does not seem it will improve in the short term. If somebody could give it a try and let me know his impressions it would be great.
- I am specially interested in bugs and lack of functionality (I might have missed some functionality), but please report any problem you become aware of.

Roadmap
Unless major flaws I am not aware of are unveiled, I would like to commit this before the end of the year even if not perfect. The reason is that I no longer have much free time, I do not know when this situation will change and I would not like that this work gets lost. I still think it is better to have a non-perfect but reasonably good hyperbola support in the Sketcher than none.

Those who give it a try, let me know your honest opinion.

I think we started this in 2014, hopefully we will finish it before 2017

Regards,
Abdullah

hyperb_tests.png (16.65 KiB) Viewed 1976 times

[triplus]

Hi Abdullah.

I will compile your branch in the following week and try it out.