The Geometer’s Sketchpad
®
for TI-89, TI-92 Plus, and
© 2000-2002 KCP Technologies, Inc.
85
Voyage™ 200 PLT User Guide and Reference Manual
To fix an angle in Sketchpad, use
†
Transform:
n
Rotate (see page 68)
to construct the rotated image of one point around a marked center point by
a fixed angle. Then draw an angle using segments or rays from the vertex
to the other two points. Dragging will no longer change the measurement
of this angle, because you’ve constructed it to be fixed in measure.
Sometimes, after tracing several objects during a drag or an animation (see
Trace, page 54), you’ll wish to stop tracing all traced objects. You can stop
any traced object by selecting it and choosing
„
Display:
{
Trace
[Object] to remove the checkmark, but if you have many objects and don’t
remember which ones are traced, this can be tedious.
You can stop tracing for all trace-activated objects by choosing
ƒ
Edit:
z
Select All followed by
„
Display:
{
Trace [Objects] and finally
„
Display:
{
Trace [Objects] again. The first command selects every
object. The first Trace command activates tracing for every (selected)
object. Because tracing is now activated for all objects, the second Trace
command deactivates tracing for all these objects. The result is that no
trace-activated objects remain in your sketch.
Sometimes, after hiding many objects, you’ll wish to show a hidden object.
But the Show All Hidden command shows all hidden objects. If you want
to show just one object, showing all of them may be overkill. There are
two ways to show just one or a few hidden objects.
The first is to use
ƒ
Edit:
n
Properties to set the visibility of a (hidden)
object to show it. While you cannot select a hidden object to display its
Properties directly, you can select a related object (a parent or a child of
the hidden object) and then navigate to the hidden object’s Properties using
the Parents and Children menus in the Object Properties dialog box page.
(See Object Properties, page 46, for more information.)
A second and more convenient method for showing one or more hidden
objects is also available. Note that Show All Hidden shows and selects all
hidden objects. Thus, you can first show all hidden objects; then deselect
the objects you wish to show from the group of just-shown, selected
objects, by clicking them with the Arrow; and then rehide the remaining
selected objects (i.e., the objects you don’t wish to show) by choosing
„
Display:
¨
Hide [Objects].
Occasionally you may wish to hide the labels of all or most labeled objects
to reduce clutter on your screen. Using the Text tool or selecting the
objects individually and using Hide Labels can be tedious if there are
many labeled objects in your sketch. A quick way to hide all visible labels
is to press
ƒ
Edit:
z
Select All, then
„
Display:
ª
Show Labels,
followed by
„
Display:
ª
Hide Labels. The first command selects every
object in the sketch. The second causes all selected objects to display their
labels. The third command—because all selected objects are already
showing labels—causes all selected objects to hide their labels. The result
is that all objects in the sketch hide their displayed labels.
Stopping Objects
from Tracing
Showing One Object
Hiding All Labels
