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How to draw a stretchable polygon on an image?

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GMD Baloch
GMD Baloch le 4 Avr 2019
Commenté : GMD Baloch le 6 Avr 2019
I have an image say cameraman.tif and I want to display it with a polygon plotted on it and I want the user to redefine the size or shape of that polygon. After pressing the return (enter button) key the image should close while returning the corner points of the polygon. The polygon I am looking for is 4 sided.

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KSSV
KSSV le 4 Avr 2019
  1 commentaire
GMD Baloch
GMD Baloch le 6 Avr 2019
imrect inserts a rectangular shape only and it can only be extended in proportion to other parallel side but I want the shape to be like a trapezoidal or non regular shape

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