HP 10413 Datasheet download pdf (Page 214)

214

Planning the

VIEWS

It is very important to the usefulness of your aplet that you carefully plan the

VIEWS menu to be clear, concise and user-friendly. It is possible to have

sub-menus in the VIEWS menu by having your option call a program which

then pops up another menu of options. This is usually denoted by an placing

an ellipsis (…) following the VIEWS option, such as the one below.

An example of the VIEWS menu from an aplet

is shown right. The aplet is called “Time

Series” and is designed to analyze time series

data.

The parent aplet for “Time Series” was the Statistics aplet. This parent was

chosen because of the need for the statistical tools it contains. For this

particular aplet most of the choices on the VIEWS menu trigger a ‘helper’

program to analyze the data in some way and

then drop the user back into the NUM view

showing the result. Some of the choices drop

back into the PLOT view to see the data

displayed.

Sometimes choices trigger further menus. For

example the last option of ‘Graphs…’ runs a

program which pops up another menu, shown

right. The reason for this method is generally

simply to avoid overcrowding the main menu.

Another example of an aplet is shown right. It

is called “Tangent Lines” and it draws a

tangent line onto a graph and then lets you

move it around, displaying the gradient as it

does so. This aplet has the Function aplet as

its parent and displays the VIEWS menu

shown right. In this case the menu has far fewer options.

The

SETVIEWS

command

The SETVIEWS programming command which creates the VIEWS menu

follows a repetitive pattern of listing a menu option, followed by the name of

the program the calculator should run if the user chooses that option,

followed by a code number which tells the calculator in which view to leave

the user once the program finishes.

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HP 10413 Datasheet Page 214