Scale transform with huds

ID:2251465
 
May 27 2017, 3:55 am (Edited on May 27 2017, 5:34 am)
Using hud objects for interfaces what would be an efficient way to scale a whole group of objects while retaining relative distances??

EDIT: So far I tried finding the relative distance before the scaling and adjusting that by the scale factor but is there a better way??

something like this
proc/ScaleHud(var/obj/a)      //a is the parent window holding other objects
    var/matrix/m=matrix()
    m.Scale(0.75)
    a.transform=m
    
    for(var/obj/o in a.Children)   //apply scaling and new locs in children
        o.transform=m
        o.screen_loc=GetNewScreenLoc(o,a,0.75)

//GetNewScreenLoc calculates the new relative distance between parent and child and returns the final location of child

this works but is there a better way?? I mean initial location is lost with this method so after many scalings Im afraid of data loss