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birt ean 128,
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Then, to add items to a particular menu, you use the menu object's insertItem member function. Its first argument is the label you want displayed for the item, and the next two arguments are references to a slot function to be executed when the item emits a signal. (This is the same as the slot arguments in the connect function.) The second argument for insertItem is the address of the object that holds the slot function, and the third argument is the slot function in that object to be executed. The following example creates an Exit item in the myfilemenu menu and connects it to the myexit slot function in the current object (denoted by the this pointer):

//============================================================= //--- Subroutine MoveToRoom //--- Inputs : RobotNode,GoalNode //--- Outputs : none //--- Calls To: FindPath,GotoPoint //--//--- causes the robot to move to the goal node from where //--- it is. It calls FindPath to get the shortest path. //------------------------------------------------------------MoveToRoom: if RobotNode <> GoalNode gosub FindPath if Found and PathLength > 0 for MTR_I = 1 to PathLength //for each node on path Dnn = PathList[MTR_I,0] //destination node number x = Nodes[Dnn,1] y = Nodes[Dnn,2] gosub GotoPoint next RobotNode = GoalNode endif endif Return //============================================================= //============================================================= //--- Subroutine FindPath //--- Inputs : RobotNode,GoalNode,MapGraph[],NodesCount //--- Outputs : PathList[],PathLength //--- Calls To: none //--//--- this routine searches the MapGraph[] for a shortest path //--- between the RobotNode and GoalNode. //------------------------------------------------------------FindPath: Dim Queue[NodesCount] QHead = 0 QTail = 0 Dim Visited[NodesCount,3] MConstant Visited,999999 Queue[QTail] = RobotNode //add to queue QTail = QTail+1 Visited[RobotNode,0] = 1 //visited Visited[RobotNode,1] = 0 //distance Visited[RobotNode,2] = -1 //predecessor while Visited[GoalNode,0]<>1 and QHead < QTail v = Queue[QHead] //deque QHead = QHead+1 for w = 0 to NodesCount-1 if MapGraph[v,w] = 1 and Visited[w,0] <> 1 Visited[w,0]=1 Visited[w,1] = Visited[v,1]+1 Visited[w,2] = v Queue[QTail] = w //add to queue QTail = QTail+1 endif next wend

myfilemenu->insertItem("Exit", this, SLOT(myexit()));

KDE currently relies directly on the Qt Toolkit. Using just Qt objects, you can create an interface with a look and feel similar to KDE. You can create a Qt application using just Qt objects and the Qt libraries. This section provides a basic introduction to Qt programming. Both the KDE development site at developer.kde.org and the Qt Web site at www.trolltech.com provide very detailed documentation and tutorials on Qt programming. It is strongly recommended that you consult these resources for a detailed presentation of Qt programming and API references.

Perl, Tcl/Tk, Expect, and Gawk are scripting languages commonly used for customized applications on Linux. Your Red Hat Linux system installs these languages as part of its

if Visited[GoalNode,0] = 1 Found = true Dim PathList[NodesCount] PathLength = Visited[GoalNode,1] PathList[PathLength] = GoalNode For FP_I = PathLength-1 to 0 PathList[FP_I] = Visited[PathList[FP_I+1],2] next else Found = false endif Return //============================================================= //============================================================= //--- Subroutine GotoPoint //--- Inputs : x,y //--- Outputs : none //--- Calls To: none //--//--- this routine turns the robot towards the location x,y //--- and then moves the robot there. If there is an object //--- in the way it terminates before reaching the point. //------------------------------------------------------------GotoPoint: dx = x-rGpsX() dy = y-rGpsY() if dx=0 AND dy = 0 then return Theta = PolarA(dx,dy)*180/pi()+90-rCompass() if Theta > 180 then Theta = Theta-360 if Theta < -180 Then Theta = Theta+360 rTurn Theta Distance = Round(PolarR(dx,dy)) For GP_I = 1 to Distance if rBumper() & 4 then break rForward 1 next Return //=============================================================

development package. Though beyond the scope of this book, a brief introduction to these languages is provided in this chapter.

The Practical Extraction and Report Language (Perl) is a scripting language originally designed to operate on files, generating reports and handling very large files Perl was designed as a core program to which features could be easily added Over the years, Perl's capabilities have been greatly enhanced It can now control network connections, process interaction, and even support a variety of database management files At the same time, Perl remains completely portable A Perl script will run on any Linux system, as well as most other operating systems such as Unix, Windows, and Mac Perl is also used extensively for implementing CGI scripts on Web sites There are extensive and detailed man pages on Perl, discussing all aspects of the language with a great many examples The man pages begin with the term perl; for example, perlfunc discusses the built-in Perl functions and perlsyn describes the different control structures.

(Continued )

You can also use the wwwperlcom site to access and search documentation including the reference manual, the online man pages, and FAQs There are extensive Internet resources for Perl On the Perl Web site at wwwperlcom, you can access documentation, software, newsgroups, and support The site has programming and reference sections where you can access detailed FAQs on topics such as CGI, modules, and security You can also access software archives and more detailed documentation Specialized Perl Web sites focus on programming, conferences, and reference resources The Comprehensive Perl Archive Network (CPAN) maintains FTP sites that hold an extensive collection of utilities, modules, documentation, and current Perl distributions You can also link to a CPAN site through the Perl Web sites Several of the Perl Web sites are listed here: wwwperlcom wwwperlmongersorg wwwperlorg republicperlcom wwwperlreferencenet www.