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Is there a way to get outer points of selected polygons?

kbhow

Hi,

Is there any SKILL codes which able to get the outer points of selected objects?

I was trying to create a new function which may required to get the outer points of selected objects (polygon/rectangle/instances and etc). I want to get a list of points where i can use it to create a polygon which cover all selected objects.

Example, let say i have selected 10 polygons, and i want a function to return me a list of outer points of my selected object. Can someone help?

Thanks

How

Parents

  • Hi kbhow,

    the "convex hull" would look like this:

                        ___                                                        _ _ _
                           |_ _|                                                    /         \

             ____        ___                                               /             \

     ___|        |     |      |____                                  /                   \

    |__  ___  |      |_______|           =>                 |_ ________  |

     

    just the outer points are connected in a way that all points are inside the new
    polygon; an interesting geometrical problem, there are some algorithms available.

    Possibly you could achieve a result similar to your drawing by upsizing all shapes
    to an intermediate layer by an amount that's sufficient to close all gaps, the shapes will merge,
    then downsizing by the same amount, the outlines should look like your drawing but
    the gaps will stay closed.

    Size resp. leHiSize() will not merge the shapes,
    dbLayerSize() or "Tools - Layer generation ... GROW" should do the job.

     kind regards

    Stefan

     

     

Reply

  • Hi kbhow,

    the "convex hull" would look like this:

                        ___                                                        _ _ _
                           |_ _|                                                    /         \

             ____        ___                                               /             \

     ___|        |     |      |____                                  /                   \

    |__  ___  |      |_______|           =>                 |_ ________  |

     

    just the outer points are connected in a way that all points are inside the new
    polygon; an interesting geometrical problem, there are some algorithms available.

    Possibly you could achieve a result similar to your drawing by upsizing all shapes
    to an intermediate layer by an amount that's sufficient to close all gaps, the shapes will merge,
    then downsizing by the same amount, the outlines should look like your drawing but
    the gaps will stay closed.

    Size resp. leHiSize() will not merge the shapes,
    dbLayerSize() or "Tools - Layer generation ... GROW" should do the job.

     kind regards

    Stefan

     

     

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