Working With The Graph Application; Figure 17.1: Upper Left Corner Of Graph Screen - Texas Instruments TI-89 Developer's Manual

Graphing calculator

Hide thumbs Also See for TI-89:

Table of Contents

The graphing application has a backup screen associated with it. This enables

the Smart Graph feature to work. As functions are graphed, the pixels are set in

both the backup screen and on the display. If none of the formats, variables, or

functions used during graphing have changed since the last time the graph was

displayed, the backup screen can immediately be shown instead of regraphing all

the functions. A few things are only drawn to the display, not the backup screen,

such as axis labels which must be redrawn every time the graph is displayed,

and cursor coordinates which are constantly changing as the cursor moves.

Working with the Graph Application

If an app or ASM will be interacting with the Graph application, it is probably a

good idea to make sure the calculator is in one graph mode, by either setting

MO_OPT_SPLIT_SCREEN = D_MODE_SPLIT_FULL or

MO_OPT_NUMBER_OF_GRAPHS = D_MODE_GRAPHS_1 (see section

8.1. Mode Settings), or an error can be displayed if the calculator is not in the

correct mode when the app or ASM starts. In the default mode with one graph,

any reference to mode settings, format settings, Window variables and editor, Y=

functions and editor, Table, stat plots, or graph databases refers to the same

graph. In split screen mode, the applications in both windows refer to the same

graph, enabling you to see a graph and table, for example, generated from the

same data. If the user changes to two graph mode after an application is open, a

CM_MODE_CHANGE event message will be received by the app, allowing it to

take any desired action.

TI-89 / TI-92 Plus Developer Guide

Not for Distribution

xmin + 3 † x/2

Chapter 17: Graphing

ymax - 3 † y/2

Beta Version January 26, 2001

Show Quick Links

Table of Contents

Ti-92 plusTi-92 plus