LocalToGlobal/GlobalToLocal Convert Window/Screen Coordinates

WINDOW 1,"Move this window",(100,100)-(400,200),1
localx = 3            ' x coordinate relative to window
localy = 30           ' y coordinate relative to window
PRINT "y="; localy; "x="; localx; " in window coordinates is..."
DIM p%(1)   ' First element of p% array is y coordinate, second is x.
WHILE INKEY$ = ""     ' Loop until any key is pressed.
  p%(0) = localy      ' Reassign window y coordinate.
  p%(1) = localx      ' Reassign window x coordinate.

  ' LocalToGlobal converts localx,localy window coordinates to
  ' global (screen) coordinates:
  LocalToGlobal p%(0)

  LOCATE 3,1
  MOVETO localx,localy
  PRINT CHR$(165)    ' Prints a dot at position fixed within window.
  PRINT "y="; p%(0); "x="; p%(1); " in screen coordinates      "
WEND
WINDOW CLOSE 1
				

WINDOW 1,"Move this window",(100,100)-(400,300),1
globalx = 250
globaly = 150
DIM p%(1)  ' First element of p% array is y coordinate, second is x.
PRINT "y="; globaly; "x="; globalx; " in global coordinates is..."
WHILE INKEY$=""    ' Loop until any key is pressed.
  p%(0) = globaly   ' Reassign fixed global y coordinate
  p%(1) = globalx   ' Reassign fixed global x coordinate

  ' GlobalToLocal converts global screen coordinates to
  ' local x, local y coordinates for the current output window:
  GlobalToLocal p%(0)

  LOCATE 2,1
  PRINT "y="; p%(0); "x="; p%(1)" in window coordinates     "
  ' The following PRINTs a big dot (extended-ASCII character 165)
  ' at screen coordinates globalx,globaly. If you put one finger on
  ' the dot, and drag the window around with the other hand, you will
  ' see that the dot is drawn at the same screen position but at
  ' different coordinates relative to WINDOW 1.
  MOVETO p%(1),p%(0)   ' Move pen to local window coordinates.
  PRINT CHR$(165);
WEND
WINDOW CLOSE 1