Table 260 – Entries in a viewport dictionary

Key

Type

Value

Type

name

(Optional) The type of PDF object that this dictionary describes; shall be Viewport for a viewport dictionary.

BBox

rectangle

(Required) A rectangle in default user space coordinates specifying the location of the viewport on the page.

The two coordinate pairs of the rectangle shall be specified in normalized form; that is, lower-left followed by upper-right, relative to the measuring coordinate system. This ordering shall determine the orientation of the measuring coordinate system (that is, the direction of the positive x and yaxes) in this viewport, which may have a different rotation from the page.

The coordinates of this rectangle are independent of the origin of the measuring coordinate system, specified in the O entry (see Ta b l e 262 ) of the measurement dictionary specified by Measure.

Name

text string

(Optional) A descriptive text string or title of the viewport, intended for use in a user interface.

Measure

dictionary

(Optional) A measure dictionary (see Table 261 ) that specifies the scale and units that shall apply to measurements taken on the contents within the viewport.