kicad-developers team mailing list archive

[Greg Smith <ecomputerd@xxxxxxxxx>]

Is SHAPE_LINE_CHAIN a core element that potentially an ARC might be translated to for display, DRC, or other output needs? If so, it seems that they would be separate with a conversion function from ARC to SHAPE_LINE_CHAIN and there would be SHAPE_ARC_CHAIN or SHAPE_SEGMENT_CHAIN (or similar) that would contain both straight lines and arcs (and other non straight shapes).

Main point: seems like a structure for only straight lines would facilitate the speed other features and analysis.

Greg S.

> On Jun 30, 2017, at 6:47 AM, hauptmech <hauptmech@xxxxxxxxx> wrote:
> 
> 
> At first glance it looks like SHAPE_LINE_CHAIN and TRACK  are the points where the development clings to straight lines the most.
> 
> One could add a single variable to line segment data structures so that they could also represent arcs.
> 
> or
> 
> One could add a layer of abstraction so that curves and areas were piecewise constructs of whatever curve segments get implemented. (arcs, ellipsoids, spirals, splines, fractals, etc). SHAPE_LINE_CHAIN and TRACK would be lists of curve segments rather than lists of line vertices as they are now.
> 
> I'd hesitate to start anything without some support for the full picture.
> 
> 
> 
>> On 30/06/17 21:11, Tomasz Wlostowski wrote:
>>> On 30.06.2017 11:05, hauptmech wrote:
>>> I asked earlier this year whether there was any interest in arc tracks
>>> and got little response.
>>> 
>>> My use case was importing altium files.
>>> 
>>> Are any of the core developers likely to accept work in this direction?
>> Hi,
>> 
>> Sure, it would be awesome if someone could work on it. It's not in the
>> plans for the 5.0 release, although some base code for handling arc
>> tracks could be already written: geometry functions that we'll need for DRC:
>> 
>> - implement a SHAPE_ARC for the geometry library, describing a non-zero
>> thickness arc
>> - write an arc to segment collision function (see SHAPE::Collide)
>> - write an arc to arc collision function.
>> 
>> Cheers,
>> Tom
> 
> 
> 
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