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- @title{Helper}{Help Panel}
-
- The Help panel performs functions for navigating through help
- text contained in help files (*.HLP) and EASI procedures (*.EAS).
-
- The panel is composed of a main area which contains the actual text
- extracted from the help file or EASI procedure. A smaller area under
- the text block titled "Subtopics / See Also" contains a list of
- other topics associated with the text currently displayed in the main
- area.
-
- There is an option menu above the "Subtopics / See Also" list which
- determines the sort order of the list. A sort order of "None" means
- that the subtopics are listed first (in the order they appear in the
- help file) followed by the See Alsos. A sort order of "Alphabetical"
- means that the subtopics and see also topics are sorted together
- in alphabetical order.
-
- The See Also topics can be distinguished in the list by the presence
- of "..." following the topic name.
-
- There are several buttons under the "Subtopics / See Also" list
- which facilitate the traversal of help topics.
-
- The "Next" button displays the text for the next subtopic from
- the current topic. It can be used to read the subtopics of a particular
- topic in order.
-
- The help topics are organized into a tree where each topic is a node and
- its children are subtopics. Essentially, this button performs a depth
- first traversal of that tree. Note that this ordering is not necessarily
- the same as the listing in the "Subtopics / See Also". Those are
- an alphabetical merger of the See Also topics and subtopics. Therefore,
- very rarely will the "Next" button show the topics in the order they
- appear in the list box.
-
- The "Top" button displays the text for the highest level in the
- hierarchy in the current file.
-
- The "Parent" button displays the text for the item of which the
- current text is a subtopic.
-
- The "Search" button activates a panel which allows topic or keyword
- searching.
-
- The "History" button activates a panel which displays a list of the most
- recently selected help topics.
-
- The "Save" button allows the currently displayed help text to be saved
- into an ASCII text file.
-
- The "Snapshot" button activates a panel containing the text from
- the main area of the Help panel. The contents of this panel do
- not change and several can be visible at once with different contents.
-
- 1 Functions
-
- The following topics outline some of the functions available from the
- help panel.
-
- 2 Search
-
- The search panel is used to find topics that contain a keyword or to
- search on a help topic. The string entered in the text field can either
- be a simple keyword (i.e. airphoto) or a fully formed help topic string
- (i.e. Xpace|Digitizing). The search
- is activated by pressing enter in the "Keyword or Topic" textfield.
- The list of matching topics is shown in the list below the textfield.
- If the list is empty, this means that no matching topics were found.
- The help for that topic can be displayed by selecting that topic from
- the list. Pressing "Close" pops down the search panel.
-
- Note that the keywords and topics are case insensitive.
-
- See Also: {..|..|Concepts|}Topic Strings, KEYWORDS
-
- 2 History
-
- Each time a new help topic is displayed in the main panel, the topic
- is added to a history list. This topic history list can be viewed
- in the history panel which is activated by pressing "History" from
- the main panel. The help for a topic can be redisplayed by selecting
- it from the list. Pressing "Close" pops down the history panel.
-
- 1 Concepts
-
- The following topics outline some of the concepts associated with PCI's
- help system.
-
- 2 Help Text Structure
-
- The help text in help files and EASI procedures is organized in
- a hierarchy. For example, the help text for IVI is structured as
- follows:
-
- @verbatim
- IVI
- |
- +----------------+----------------+
- | | |
- PARAMETERS DETAILS EXAMPLE
- |
- +-------+-------+-------+-------+
- | | | | |
- FILE DBIC VDOC DBIW VDOW
- @end
-
- Understanding this structure is important for forming topic strings
- effectively.
-
- See Also: {..|..|Concepts|}Topic Strings
-
- 2 Topic Strings
-
- The format of a topic string is:
-
- <topic>|<subtopic-1>|<subtopic-2>| ... |<subtopic-n>
-
- where <topic> is the name of a PACE task or EASI procedure (e.g. IVI
- or PROGNO) and each <subtopic-m> is the name of a subtopic at the
- m'th level in the help hierarchy.
-
- For example, the search string "IVI|PARAMETERS|FILE" would specify
- the help text explaining the use of the FILE parameter for the PACE
- task IVI. Note that subtopics in the string do not have
- to be specified completely so for the previous example, "IVI|PAR|FI"
- would achieve the same result.
-
- See Also: {..|}Help Text Structure
-
- 1 Helper
-
- The "helper" is a standalone program which activates a help panel
- from the system command prompt rather than from within a PCI application
- such as ImageWorks. The syntax for the helper command is:
-
- % helper <topic> <subtopic-1> <subtopic-2> ... <subtopic-n>
-
- where <topic> and <subtopic-m> have the same meaning as they do
- in topic strings.
-
- For example, the following command would display information on the
- Albers Conical Equal Area projection:
-
- % helper proset proj acea
-
- The helper can also be invoked with no arguments, in which case the
- user can perform a search for an appropriate help topic.
-