This macro is created via icon
of the displays expandable toolbar (fourth from the bottom).
When activated such a macro erases the display and redraws the figure. It is useful to erase traces produced by another macro.
To be noticed :
- Only one macro of this type can be created in a figure.
- If the figure uses calls of rand() function, activating this macro will cause a new value to be affected for all the calls of random function, thus allowing a random experience to be updated.