Sociolinguistic map of Oceania showing the current situation of Polynesian languages:
original area
the diglossia that arose during the 19th and 20th century :
spread of linguas francas (Tahitian, Cook Island Maori, Tongan in Niuafo'ou)
Influence of English and French (and Spanish for Rapa Nui, not shown on the map)
Endangered languages are shown according to UNESCO (Christopher Moseley, Atlas of the World’s Languages Danger, UNESCO, 2010, 222 p., map 27 p 217, url http://unesdoc.unesco.org/images/0018/001870/187026e.pdf)
Two Polynesian languages are dead: Niuatoputapu and Moriori
Many speakers of Polynesian languages are overseas in diasporas, which is shown with the blue arrows towards New Caledonia and New Zealand.NB: the boundary between language and dialect is not always clear, thus I refered to these sources :
http://www.axl.cefan.ulaval.ca (Aménagement linguistique dans le monde) for each country

Cook Islands :
http://cookislandsdictionary.com/sources
http://www.axl.cefan.ulaval.ca/pacifique/cook.htm
French Polynesia :
Charpentier, Jean-Michel &amp; Alexandre François. 2015. Atlas Linguistique de Polynésie Française — Linguistic Atlas of French Polynesia. Berlin, Papeete : Mouton de Gruyter &amp; Université de la Polynésie Française. ISBN : 978-3-11-026035-9.  (http://www.upf.pf/sites/default/files/atlaspf/ALPF_01_Chapitres.pdf) carte p21
Niuafo’ou and Niuatoputatpu : Tsukamoto 1994 (Forschungen über die Sprachen der Inseln zwischen Tonga und Saamoa, LIT Verlag Münster, 1994)Wikipedia article: https://fr.wikipedia.org/wiki/Langues_polynésiennes
Original map : File:BLANK in Oceania (small islands magnified) (-mini map -rivers).svg

Arrows taken from file:1993_Georgia_war2.svg
Own work
Skimel