CHAPTER 8
642
Interactive Features
The
MK
entry can be used to provide an
appearance characteristics dictionary
con-
taining additional information for constructing the annotation’s appearance
stream. Table 8.40 shows the contents of this dictionary.
TABLE 8.40 Entries in an appearance characteristics dictionary
KEY
TYPE
VALUE
R
integer
(Optional)
The number of degrees by which the widget annotation is rotated
counterclockwise relative to the page. The value must be a multiple of 90.
Default value: 0.
(Optional)
An array of numbers in the range 0.0 to 1.0 specifying the color of the
widget annotation’s border. The number of array elements determines the color
space in which the color is defined:
0
1
3
4
No color; transparent
DeviceGray
DeviceRGB
DeviceCMYK
BC
array
BG
array
(Optional)
An array of numbers in the range 0.0 to 1.0 specifying the color of the
widget annotation’s background. The number of array elements determines the
color space, as described above for
BC
.
(Optional; button fields only)
The widget annotation’s
normal caption,
displayed
when it is not interacting with the user.
Note:
Unlike the remaining entries listed below, which apply only to widget annota-
tions associated with pushbutton fields (see “Pushbuttons” on page 686), the
CA
entry can be used with any type of button field, including check boxes (“Check Box-
CA
text string
RC
text string
(Optional; pushbutton fields only)
The widget annotation’s
rollover caption,
dis-
played when the user rolls the cursor into its active area without pressing the
mouse button.
(Optional; pushbutton fields only)
The widget annotation’s
alternate (down)
caption,
displayed when the mouse button is pressed within its active area.
(Optional; pushbutton fields only; must be an indirect reference)
A form XObject
defining the widget annotation’s
normal icon,
displayed when it is not interacting
with the user.
AC
text string
stream
I