Cycloïd Suggestion

Hi,

I have ask some times ago if we could have a possibilité to draw cycloïd with LibreCAD

http://liutaiomottola.com/formulae/curtate.htm
http://www.cgl.uwaterloo.ca/~smann/ccycloid/

Would it be possible?

Thanks

It would be possible to write a plugin for that, but that needs a developer experienced in C++ and interested cycloid math. I can add a feature request to github issues, but can't say if and when somebody will take this challenge.

The online calculator you have linked, already has the possibility to export DXF. I haven't tested this, are there any issues with that DXF?

Another option is to use the CSV output of that calculator or any other source which can calculate X/Y points on the cycloid. With the ASCII import plugin it should be possible to import the cycloid from a simple text file containing X/Y coordinates. Not the best solution, but it may work.
The file format for ASCII import is very simple (No.;X;Y):

1;0;0
2;0.1;0.05
3;0.2;0.1
4;0.3;0.15
...

https://github.com/LibreCAD/LibreCAD/issues/933

LordOfBikes wrote

The online calculator you have linked, already has the possibility to export
DXF. I haven't tested this, are there any issues with that DXF?

Yes it works by importing it towards Librecad. But it is easier to work with only one software.
This software only works online.

Thanks for helping

Would it be possible to use the cycloïd formula :
x = aφ - b sin φ
y = a - b cos φ

with the libreCAD tools :
Plugin / Plot
Then entering the two equations

I have not succeed yet but do you thing it could work ?