Blocking call to interact with a figure.
Wait until the user clicks n times on the figure, and return the coordinates of each click in a list.
There are three possible interactions:
The actions are assigned to mouse buttons via the arguments mouse_add, mouse_pop and mouse_stop. Mouse buttons are defined by the numbers:
The keyboard can also be used to select points in case your mouse does not have one or more of the buttons. The delete and backspace keys act like right clicking (i.e., remove last point), the enter key terminates input and any other key (not already used by the window manager) selects a point.
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