google maps - get new coordinates for polygon and polyline -

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i using google maps javascript api v3. have drawn polygon , polyline on map using data based on sharepoint list. have added click event polygon , polyline displays popup on click of region/line.

in popup have added button named edit shape. on click of want allow user edit shape. able edit shape.

however not sure how new coordinates region or line.

can please tell me how edited/newly changed coordinates. please helpful if can post example in similar ways.

thanks.


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