c# - I got points on a map.Getting all independent inner polygons that are formed? -


i got points on map , lines connecting points.

how independent inner polygons formed?

the linked picture describes problem.

http://i.imgur.com/0lda3ji.jpg

i'm supposing need tree search algorithm enumerates points , connecting lines in tree structure , searches cycles job kinda on head.

in perfect world example in c#.)

i found:

finding cycles in undirected graphs

but not mark independent polygons. finds possible polygons overlapping ones.

i'm using google maps. use case is: detect clicks on map , draw points. detect click on points , lines between points. need automaticaly generate polygons lines , points. sure can draw polygons. dont know ones (what coordinates - or rather: points choose polygon)

i have no experience in graphics , how colour polygon once you've found it, assuming:

  1. you have polygons themselves.
  2. they not patialy overlap or other weird behaviour.

then colouring pseudo code go this:

while listofpolygons not empty     temp <- find smallest polygon in listofpolygons      colour temp     remove listofpolygons polygons containing temp     remove temp listofpolygons

notice part finding containing polygons might tricky.

edit:

checking if polygon in polygon b can done checking if corner (vertex?) of located inside b.


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