190 Macintosh
User's
Handbook
The Trace Edges command will invert the object within
the selection and trace its outline in black.
If
executed again,
Trace Edges will reinvert
and
retrace the object. Each succes-
sive repetition
of
Trace Edges causes the object within the
rectangle to be reinverted
and
retraced.
The tracings will extend
to
the borders
of
the selection
rectangle. The tracings disappear as they pass through the
borders
of
the selection rectangle. This feature
is
suitable for
retracing a word
or
covering the entire drawing surface with
an
intricate pattern.
The two flip commands are essentially self-explanatory.
Flip Horizontal exchanges the selection rectangle horizontally,
while Flip Vertical exchanges it vertically.
The
Rotate
command rotates the selection rectangle and
its contents
90° counter-clockwise. Note
that
a Flip Horizontal
is
not equivalent to two Rotates. With a flip, the item
is
mirrored
about
an
axis. This contrasts with Rotate where the
image rotates in a single plane. Examples
of
the Invert, Trace
Edges, Flip Horizontal, Flip Vertical, and Rotate commands
appear
in figure 6.21. Note the positions
of
the small line drawn
through the shape compared with the original.
THE GOODIES MENU
This menu
is
unique
to
MacPaint.
It
contains many
options which are useful when creating graphics,
or
when a
display must conform to some required set
of
specifications.
The first option
is
Grid. Imagine a grid pattern like
that
shown in figure 6.22a superimposed
upon
the MacPaint Doc-
ument. The intersection
of
any two grid lines
is
defined as a grid
coordinate. The vertical
or
horizontal distance between any
two grid coordinates
is
eight pixels. Selecting the Grid option
will constrain the cross hairs
to
move from grid coordinate
to
grid coordinate. They may
not
appear
in any
other
location.
Notice, by
dot
inversion,
that
the cross hairs
appear
within the
grid example.
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