Autohotkey sample to show how to draw a box on screen

draw_rectangle.ahk

; Autohotkey sample to show how to draw a box on screen
; https://www.autohotkey.com/boards/viewtopic.php?t=25520
#Persistent

global border_thickness = 10
global border_color = FF0000

; ctrl + 1
^1::Rect_Draw(100,100,100,100)
return

; ctrl + 2
^2::Rect_Destroy()
return

Rect_Draw(x, y, w, h)
{
  global border_color
  global border_thickness

  Gui, TheBoxThingy:+Lastfound +AlwaysOnTop +Toolwindow
  iw:= w + border_thickness
  ih:= h + border_thickness
  w:=  w + ( border_thickness * 2 )
  h:=  h + ( border_thickness * 2 )
  x:=  x - border_thickness
  y:=  y - border_thickness
  Gui, TheBoxThingy:Color, FF0000
  Gui, TheBoxThingy:-Caption

  ; outer rectangle
  o1a := 0
  o1b := 0
  o2a := w 
  o2b := 0 
  o3a := w 
  o3b := h 
  o4a := 0 
  o4b := h 
  o5a := 0
  o5b := 0

  ; inner rectangle
  i1a := border_thickness
  i1b := border_thickness
  i2a := iw
  i2b := border_thickness
  i3a := iw
  i3b := ih
  i4a := border_thickness
  i4b := ih
  i5a := border_thickness
  i5b := border_thickness

  ; Draw outer & inner window(s)
  WinSet, Region, %o1a%-%o1b% %o2a%-%o2b% %o3a%-%o3b% %o4a%-%o4b% %o5a%-%o5b%   %i1a%-%i1b% %i2a%-%i2b% %i3a%-%i3b% %i4a%-%i4b% %i5a%-%i5b%
  Gui, TheBoxThingy:Show, w%w% h%h% x%x% y%y% NoActivate, Table awaiting Action
  
}
return

Rect_Destroy() {
  Gui TheBoxThingy:destroy
}