kicad-developers team mailing list archive

[Tomasz Wlostowski <tomasz.wlostowski@xxxxxxx>]

On 22/01/18 17:21, jp charras wrote:
> Hi Orson and Tomasz,
> 
> This issue comes from the bug report 1744732.
> 
> In some cases (easy to reproduce), the new connectivity algo see pads as connected, although it is
> not the case.
> 
> Attached a very simple case.
> 
> If 2 pads are at the same Y coordinate, and 2 horizontal track segments at the same Y coordinate are
> connected to these 2 pads, the 2 pads are seen as connected.
> 
> If the Y coordinate is not common to all pads and segment ends, or if there are other segments
> connected to horizontal segments, pads are seen as not connected as expected.
> 
> The stable version (in GAL mode has also a strange behavior), and works in legacy mode.
> 
> I am not very familiar with the new connectivity algo, this is the reason I ask you to have a look
> into this issue.
> 
> And I will be very happy if someone could add a few (or many) comments in connectivity_algo.h:
> there is not a lot of comments in connectivity_algo.* files (Read: 0 comments) for this non trivial
> code.
> 
> Thanks.
> 

Hi JP,

I can reproduce it on my system, it's not the connectivity algo but the
ratsnest EMST algorithm. I'll check this tomorrow (and promise to commit
some comments explaining how the algorithm works!)

Cheers,
Tom