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Drawing Module provides mechanism to the user to draw different parts of the anatomy (whole body back and front; hand/arm top/bottom; retinas; etc.) and save them as complex observations. The user can also upload images and draw on the image. He can make notes on the image which he can later view / edit / delete those drawings.
This is how the drawing editor looks like you can draw, upload and annotate in images with the help of this editor.
Source code: https://github.com/ravipatipushkar/drawing