| 1 | \chapter{Intercoms}
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| 2 |
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| 3 | \section{Design Philosophy}
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| 4 |
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| 5 | The intercoms category implements an expandable command interpreter which
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| 6 | is the key mechanism in {\sc Geant4} for realizing customizable and
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| 7 | state-dependent user interactions with all categories without being
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| 8 | perturbed by the dependencies among classes. The capturing of commands is
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| 9 | handled by a C++ abstract class {\it G4UIsession}. Various concrete
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| 10 | implementations of the command capturer are contained in the [user]
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| 11 | interfaces category. Taking into account the rapid evolution of graphical
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| 12 | user interface (GUI) technology and consequent dependence on external
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| 13 | facilities, plural and extensible GUIs are offered.
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| 14 |
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| 15 | Programmers need only know how to register the commands and parameters
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| 16 | appropriate to their problem domain; no knowledge of GUI programming is
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| 17 | required to allow an application to use them through one of the available
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| 18 | GUIs.
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| 19 |
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| 20 | The intercoms category also provides the virtual base classes
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| 21 | \begin{itemize}
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| 22 | \item G4VVisManager,
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| 23 | \item G4VGraphicsScene, and
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| 24 | \item G4VGlobalFastSimulationManager.
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| 25 | \end{itemize}
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| 26 |
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| 27 | \section{Class Design}
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| 28 |
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| 29 | \begin{itemize}
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| 30 | \item {\bf G4UISession} -
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| 31 | \item {\bf G4UIBatch} -
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| 32 | \item {\bf G4UICommand} -
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| 33 | \item {\bf G4UIparameter} -
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| 34 | \item {\bf G4UImessenger} -
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| 35 | \end{itemize}
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| 36 |
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| 37 | The object-oriented design of the 'user interface' related classes
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| 38 | is shown in the class diagram Fig. \ref{figure:userInt-1}.
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| 39 | The diagram is described in the Booch notation.
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| 40 | \newline
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| 41 |
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| 42 |
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| 43 | \begin{figure}[h!]
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| 44 | \includegraphics[angle=0,scale=0.55]{OOAnalysisDesign/UserInterface/classDgmUserInterface.eps}
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| 45 | \vspace{10pt}
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| 46 | \caption{Overview of intercom classes}
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| 47 | \label{figure:userInt-1}
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| 48 | \end{figure}
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| 49 |
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| 50 |
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| 51 | \section{Status of this section}
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| 52 |
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| 53 | 27.06.05 design philosophy (from Geant4 general paper) and class design
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| 54 | sections added by D.H. Wright \\
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| 55 |
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