[geos-devel] Removing multiple vertices

[Martin Davis]

There's no function for doing that in GEOS. So yes, you will have to
implement that yourself, via the approach you suggest.



On Thu, Apr 11, 2019 at 11:57 AM Paul Meems <bontepaarden at gmail.com> wrote:

> Hello,
>
> Currently, I'm working on improving the Shapefile editor of
> MapWinGIS/MapWindow5.
> Under the hood, it is using a lot of GEOS functions.
>
> When opening a shapefile we can draw a temporary polygon and use it to
> erase a part of the shapefile. We use GEOS::Difference to 'eat' the drawn
> polygon from the shapefile.
> This works fine.
>
> We now want a similar option. But this time not 'stamp' the drawn polygon
> on the shapefile but remove all vertices of the shapefile that are inside
> (under) the drawn polygon.
>
> Does GEOS have a method for that or should I just loop through all
> vertices of the shape and check if it is inside the drawn polygon and
> remove it when it does?
>
> Thanks for any advice,
>
> Paul
>
> *Paul Meems *
> Release manager, configuration manager
> and forum moderator of MapWindow GIS.
> www.mapwindow.org
>
> Owner of MapWindow.nl - Support for
> Dutch speaking users.
> www.mapwindow.nl
>
>
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>
>
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>
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>
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