kicad-developers team mailing list archive

[Jeff Young <jeff@xxxxxxxxx>]

A couple of more commits are up (including backing out the polyline change).

> On 19 Sep 2018, at 19:27, jp charras <jp.charras@xxxxxxxxxx> wrote:
> 
> Le 19/09/2018 à 13:01, Rene Pöschl a écrit :
>> On 19/09/2018 11:54, jp charras wrote:
>>> Le 19/09/2018 à 11:40, Rene Pöschl a écrit :
>>>> Ok i looked at the pot symbols. They are indeed strange. (ignore my last
>>>> message)
>>>> 
>>>> However, how does the new fill algorithm work with things like the logic
>>>> gates. (Example the symbol for 74LS00) It has an open polygon on purpose
>>>> as it consists of that polygon plus an arc. We still want the body do be
>>>> filled but do not want a visible line between the arc and the polygon
>>>> body.
>>> There is no problem with 74LS00 and 74LS02 shapes.
>>> 
>>> You could find an issue with a 74LS32, but the polygon used as a filled
>>> shape is broken: its line width is set to -1000 mils, a bit strange.
>>> 
>> 
>> The reason for that is that kicad did not (or does not) support filling
>> shapes with concave arcs in it. So the outline was made with arcs and
>> lines whereas the filled part was made with a single polygon that
>> approximates the shape needed. To reduce the number of needed line
>> segments the shape is approximated quite crudely. This works because the
>> filled shape does not have an outline to it. (Meaning the errors in it
>> are hidden by the true outline that is created from arcs) As setting
>> line width to 0 does not result in a polygon of 0 width the trick with
>> the large negative value was used to achieve this.
> 
> I understand.
> But a better way could be using the minimal width (1 mil) because 0 is
> (for historical reasons) selecting the default pen size value.
> 1 mil should work fine in this case.
> 
> A negative value has serious issues:
> - As a width it has currently no sense.
> - polylines with line thickness <= 0 cannot be selected: it means you
> cannot edit/move or delete them. This is the most annoying issue.
> 
> -- 
> Jean-Pierre CHARRAS
> 
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