i need to calculate the vertices of the polygon how can i get that after applying the margin to the polygon

[thamee]

if the polygon has four vertices, after performing margin function the output is more than four points , but in some scenarios, I need to calculate the vertices I can I achieve that

[w8r]

is your geometric shape rectangular?

[thamee]

is your geometric shape rectangular?
yes I have four points of the vertices and i know the height and width of the rectangle before pass into the offset function but I need the vertices after the margin function