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CHAPTER 8 Interactive Features
TABLE 8.27 Line ending styles
NAME APPEARANCE DESCRIPTION
Square A square filled with the annotation’s interior color, if any
Circle A circle filled with the annotation’s interior color, if any
Diamond A diamond shape filled with the annotation’s interior color, if any
OpenArrow Two short lines meeting in an acute angle to form an open arrowhead
ClosedArrow Two short lines meeting in an acute angle as in the OpenArrow style (see
above) and connected by a third line to form a triangular closed arrowhead
filled with the annotation’s interior color, if any
None No line ending
Butt (PDF 1.5) A short line at the endpoint perpendicular to the line itself
ROpenArrow (PDF 1.5) Two short lines in the reverse direction from OpenArrow
RClosedArrow (PDF 1.5) A triangular closed arrowhead in the reverse direction from
ClosedArrow
Slash (PDF 1.6) A short line at the endpoint approximately 30 degrees clockwise
from perpendicular to the line itself
Square and Circle Annotations
Square and circle annotations (PDF 1.3) display, respectively, a rectangle or an
ellipse on the page. When opened, they display a pop-up window containing the
text of the associated note. The rectangle or ellipse is inscribed within the annota-
tion rectangle defined by the annotation dictionary’s Rect entry (see Table 8.15 on
page 606). Figure 8.8 shows two annotations, each with a border width of 18
points. Despite the names square and circle, the width and height of the annota-
tion rectangle need not be equal. Table 8.28 shows the annotation dictionary en-
tries specific to these types of annotations.
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