ii11overview.htm
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<p class=heading-2>II.1.1. Overview</p>
<p class=heading-2-p> </p>
<p align="justify" class=normal>The <b><i>PN Toolbox</i></b> provides a set of
commands for building a PN model, which are accessible from the <b><i><a href="i22modelingmenu.htm">Modeling</a>
</i></b>menu or from the corresponding buttons in the <b><i><a href="i5drawingpanel.htm">Drawing
Panel</a></i></b>. The model may be easily drawn, in a natural fashion, in the
<b><i><a href="i4drawingarea.htm">Drawing Area</a></i></b>. The user can also
have a read/write access to the properties of the net nodes and arcs by opening
the dialog box associated with the object selected in the <b><i><a href="i4drawingarea.htm">Drawing
Area</a></i></b>. In addition, the <b><i>PN Toolbox</i></b> allows the assignment
of priorities and/or probabilities to conflicting transitions.</p>
<p class=normal> </p>
<p align="justify" class=normal>The <b><i><a href="i4drawingarea.htm">Drawing
Area</a></i></b> displays a grid with dotted gray lines. The user may hide or
show these lines by using the command <b><i><a href="i23viewmenu.htm#ShowGrid">View/Show
Grid</a></i></b> or by pressing the corresponding button from the <b><i><a href="i3quickaccesstoolbar.htm">Quick
Access Toolbar</a></i></b>. The nodes of the PN may be placed only in the grid
cells; each cell can contain a single net node. This way, each node is uniquely
characterized by its coordinates in the <b><i><a href="i4drawingarea.htm">Drawing
Area</a></i></b>.</p>
<p class=normal> </p>
<p align="justify" class=normal> A PN model created in the <b><i>PN Toolbox</i></b>
is saved as an <i>XML </i>file<i>.</i> Besides the automatic generation of the
XML file of a model, any text editor can be used to produce such a file if the
user complies with the syntax given in <a href="appendixaxmlfileformatofafilecontainingapnmodel.htm">Appendix
A</a>.</p>
<p class=normal> </p>
<p align="justify" class=normal>The first step in the creation of a new model
is to define its type. By selecting the type of the PN, some of the work variables
are automatically changed. This is because the simulation and analysis procedures
differ from one type to another. The drawing board of a new model may be opened
in the <b><i><a href="i4drawingarea.htm">Drawing Area</a> </i></b>by selecting
the <b><i><a href="i21filemenu.htm#NewModel">File/New Model</a></i></b> command
or by pressing the <b><i><a href="i3quickaccesstoolbar.htm#FigI10">New</a></i></b>
button from <b><i><a href="i3quickaccesstoolbar.htm">Quick Access Toolbar</a></i></b>.
This command opens a dialog box (fig. II.1) which permits the selection of the
type of model to be built. The default type is <b><i>U</i></b><b><i>ntimed PN</i></b>.</p>
<p class=normal> </p>
<p align="center" class=normal><img border=0 src="_PNToolbox-13.jpg"></p>
<p align="center" class=figura>Fig. II.1. <i>The dialogue box for selecting the
type of a PN model.</i></p>
<p class=figura-p> </p>
<p align="justify" class=normal> A previously created model may be loaded from the disk by means of the command <b><i><a href="i21filemenu.htm#OpenModel">Open</a></i></b> available
under the <b><i><a href="i21filemenu.htm">File</a></i></b> menu or by pressing
the <b><i><a href="i3quickaccesstoolbar.htm#FigI10">Open</a></i></b> button
from the <b><i><a href="i3quickaccesstoolbar.htm">Quick Access Toolbar</a></i></b>.
Changes in an existing model can be done directly in the GUI while in <b><i><a href="petrinettoolboxatafirstglance.htm#Fig1">Draw
Mode</a></i></b>, or by editing the corresponding <b><a href="appendixaxmlfileformatofafilecontainingapnmodel.htm">XML</a></b>
file.</p>
<p class=normal> </p>
<p align="justify" class=normal>If a model is already loaded in the window, the
<b><i><a href="i4drawingarea.htm">Drawing Area</a></i></b> is cleared by selecting
the command <b><i><a href="i21filemenu.htm#CloseModel">File/Close Model</a></i></b>.</p>
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