Exploring MacPaint 205
CONSTRAINED MANIPULATIONS
Constrained manipulation of objects upon the drawing
surface
is
restricted
to
either the horizontal
or
vertical direc-
tions. This means
that
if the mouse
is
moved in a general left
or
right direction when using the lasso
or
selection rectangle with
the
Shift key, the Mac will interpret the movement as horizon-
tal.
If
the mouse progresses in a general up
or
down direction,
this
is
interpreted as a vertical constraint.
To
illustrate constrained movement,
we
will move the
various picnic foods about the surface in constrained horizon-
tal and vertical directions. Return the picnic scene to the draw-
ing surface using the
Show Page option.
Use
the selection
rectangle to select the picnic basket. Then, press
Shift
and
drag
the picnic basket. Notice that a general up
or
down movement
of
the mouse, with
an
elevation greater
than
45
degrees, results
in a vertical constraint. A general left or right mouse move-
ment, less than
45
degrees, causes a horizontal constraint.
When the mouse
is
released, the Mac considers the movement
to
be complete.
Use constrained movement to maneuver the picnic basket
about
the page. Position the basket in the open space
to
the left
of
the tree. Once you have pressed the mouse button and Shift
key, the Shift key can be released without affecting the con-
strained manipulation
of
the object on the drawing surface.
The lasso
is
constrained in the same manner. Use the lasso
to
move the thermos near the picnic basket using constraints.
Do the same with the watermelon.
CONSTRAINED DRAWING
Now that
we
have cleared a working area,
we
can use
constraints to draw the picnic table. The movement
of
the
following tools
is
constrained when used with the Shift key
depressed:
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