MIL-DTL-87268D
TABLE I.
List of minimum interface virtual functions.
Virtual Function
Description
SELECT
Make a choice at the current cursor position
POINTER SELECT
Move cursor and make a choice at the current pointer position
OK
End input; process data or indicated action
DELETE
Remove items indicated by the cursor
CANCEL
Terminate current action without entering data
MENU
Activate Menu and toggle menu bar on if applicable
UP
Move cursor up
DOWN
Move cursor down
LEFT
Move cursor left
RIGHT
Move cursor right
TAB
Move cursor to next ield
BACK TAB
Move cursor to previous ield
SCROLL-UP
Move scroll bar slider box up (image down)
SCROLL-DOWN
Move scroll bar slider box down (image up)
SCROLL-LEFT
Move scroll bar slider box left (image right)
SCROLL-RIGHT
Move scroll bar slider box right (image left)
CENTER
Relocate center of graphic to position of cursor after ZOOM-IN
ZOOM-IN
Enlarge the displayed image
ZOOM-OUT
Reduce the displayed image
SYSTEM HELP
Access application help
CONTEXT HELP
Access situation-speciic help
FULL SCREEN
Enlarge graphic to size of client area
QUIT
End current application; close windows associated with application
TABLE II. Minimum and optimal character heights for 16 and 20 minutes of
arc at various viewing distances.
Viewing Distance (Inches)
Minimum Character
Optimal Character Height
Height 16 Minutes
20 Minutes of Arc (Inches)
of Arc (Inches)
18
0.08
0.11
24
0.11
0.14
30
0.14
0.17
36
0.17
0.21
42
0.20
0.24
48
0.22
0.28
30
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