The Geometer’s Sketchpad
®
for TI-89, TI-92 Plus, and
© 2000-2002 KCP Technologies, Inc.
49
Voyage™ 200 PLT User Guide and Reference Manual
Display
Determines how Sketchpad displays the function
plot. When Continuous, Sketchpad connects all of a
plot’s sampled points into a curve. When Discrete,
Sketchpad displays the plot’s samples as individual
points and does not connect them.
Domain
Determines the domain of the function’s
independent variable. By default, Sketchpad plots
new functions over a domain equal in size to the
screen. You can change the domain by entering a
minimum and maximum value in the From and To
fields of Graph Properties. For graphs of y = f(x),
x = f(y), and
θ
= f(r), the domain should be specified
in units on the x-, y-, or r-axis. For graphs of
r = f(
θ
), the domain should be specified as an angle
in the current units (as determined by Preferences).
Button Properties
This page contains properties for action buttons and appears only when an
action button with changeable properties is selected. (See Action Buttons,
page 56, for more information.) The properties that appear on this page
depend upon the type of action button.
Button Properties for Show Buttons
A Show button has a single property:
Show As
Determines—when the button is pressed—whether
the button selects the objects that it shows. By
default, Sketchpad shows all objects as Selected. If
you would rather the Show button not select the
objects that it shows, switch this property to
Deselected.
Button Properties for Animate Buttons
The properties for Animate buttons give you control over the various
animated points that are set in motion by the button when it is pressed.
(See Animate, page 55, for a discussion of animation.)
Options For Point
Determines which animated point the other
properties on this page apply to. This pop-up menu
lists all of the points animated by the action button;
choose a specific point from it before setting that
point’s speed and direction. (Note that the points
that appear in this list may be different from the
objects you selected to animate when you created
the Animate button. Sketchpad shows the set of
points that must move in order to animate your
selected objects, even if these points are different
from the selected objects themselves.)
You can also set the domain
of a plotted function by
dragging the arrowheads
that appear at the endpoints
of the function plot.
When entering limits for the
domain, you can use
mathematical expressions
as well as numbers. For
instance, if your function’s
equation was r = f(
θ
) and
your current angle unit was
radians, you might enter 2
π
(or
π
/4) as the upper limit of
the domain instead of an
approximation such as 6.28.
By changing an animation’s
properties, you can specify
more complex or precise
motions than you can create
using
„
Display:
n
Animate.