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 *The MapWindow GIS project has a new forum <https://mapwindow.discourse.group>!* Download the latest MapWinGIS mapping engine. <https://github.com/MapWindow/MapWinGIS/releases> Download the latest MapWindow 5 open source desktop application. <https://github.com/MapWindow/MapWindow5/releases>
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