Find 'empty' sector outlines

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Apeirogon
Posts: 1606
Joined: Mon Jun 12, 2017 12:57 am

Find 'empty' sector outlines

Post by Apeirogon »

I have function that collect one sided map lines and then sort them into a groups of closed outline aka group of lines that 'draw' closed polygon.
It works, but it also create groups of 'empty' sectors.
On the example of a picture
new.jpg
it filter lines in three groups, rectangle, square and weird shape respectively.

Problem here, I dont need that square and shape for future processing, only a rectangle. How find out that group of lines is an 'empty' space and delete them?

Picture is only an example, 'real life' maps have more complex geometry.
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