ACE3/addons/map/functions/fnc_calculateMapScale.sqf

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/*
* Author: CAA-Picard
*
* Returns the equivalent of 100m in screen coordinates
*
* Argument:
* None
*
* Return value:
* Return
*/
_pos = ((finddisplay 12) displayctrl 51) ctrlMapScreenToWorld [0.5, 0.5];
_screenOffset = ((finddisplay 12) displayctrl 51) posWorldToScreen [(_pos select 0) + 100, (_pos select 1)];
(_screenOffset select 0) - 0.5