Ability to compose two shapes: union, intersection, substraction

[Vojta8887]

Having the ability to calculate and create the intersection of two surface shapes (polygon / circle) as a new shape. For this to be technically feasible, the circle would need to get converted to a polygon (already handled by the code when exporting items to KML for Google Earth since KML does not support circles). There are probably utility code out there to do this in a relatively straightforward way. For this to really make sense, UI would need to allow the user to select two shapes to create either the intersection, union or substraction of them.

Original message:

Is your feature request related to a problem? Please describe.
I use this app to play hide-and-seek across towns and villages where the seeker can ask the hider yes or no questions. The seeker can then use your app to map out the area where the hider is (example: are you within 200 m of me? answer: yes, so the seeker can use Map Marker to create a 200 m circle around him), but then if I have more data that I have to add to my map it starts to get confusing.

Describe the solution you'd like
I think it would be much better if you could invert the area you have selected to then know where the hider isn't instead of where he is (because then there wouldn't be any overlap between the markers of his possible location).

Describe alternatives you've considered
I have not found a better app than yours for this specific purpose but it'd be so much better if you could do this.

[androidseb]

Hey, thanks for proposing an idea.

I don't quite understand what you mean by "invert the zones of markers", could you clarify this bit please?

Do you mean take two existing shapes and transform them to keep only their intersection? Like for example taking two circles and combining them to shrink them to their intersection, like the red-circled center part you can see on the screenshot below?

[Vojta8887]

Yes, basically. I would like to be able to "cut out" the red circle from the green one - that would leave only the outer part of the green circle and where there was the red circle there would be nothing.

I hope I helped you understand it better. Thanks!

[androidseb]

Thanks for the clarification, I've edited your initial message to make this item actionable.