View source for DrawMGRSGrid

{{Template:FunctionInfo|fName=          DrawMGRSGrid|fDescription=   Draws an MGRS grid marker using four corner points.|parentFile=     cmm.drawFunctions.lua|syntax=         CMM.DrawMGRSGrid(<argTbl table>)|return=         table or nil|returnDesc=     Returns a one‑element table containing the created Marker ID, or nil if the grid data was invalid.|example=        CMM.DrawMGRSGrid(TL={x=0,y=0,z=0}, BL={x=1000,y=0,z=0}, BR={x=1000,y=0,z=-1000}, TR={x=0,y=0,z=-1000})|exampleDesc=    Draws a 1 km × 1 km MGRS grid centred at the origin and returns its Marker ID.|related=        |note=           |envType= CMM|par1=         table argTbl|reqType1=     table|reqName1=     argTbl|desc1=       Marker Argument Table (TL, BL, BR, TR corners; optional fillColour, lineColour, lineType, coalition).}}