ii12places.htm
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<p class=heading-2>II.1.2. Places</p>
<p class=heading-2-p> </p>
<p align="justify" class=normal>A place is graphically represented in the <b><i><a href="i4drawingarea.htm">Drawing
Area</a></i></b> by a circle. To draw a place in the <b><i><a href="i4drawingarea.htm">Drawing
Area</a></i></b>, the user must press the <b><i><a href="i5drawingpanel.htm">Add
Place</a> </i></b>button from the <b><i><a href="i5drawingpanel.htm">Drawing
Panel</a></i></b> or select the <b><i><a href="i22modelingmenu.htm#AddPlace">Add
Place</a> </i></b>command from the <b><i><a href="i22modelingmenu.htm">Modeling</a>
</i></b>menu. Then, the user must click only once into the desired grid cell
of the <b><i><a href="i4drawingarea.htm">Drawing Area</a></i></b>. A second
click in the same grid cell has no effect.</p>
<p class=normal> </p>
<p align="justify" class=normal>Once the circle corresponding to a place is drawn,
a label is automatically attached to it. The default position of the label is
below the circle.</p>
<p > </p>
<p class=normal style="text-align: center;"><img ID="FigII2" src="fig.II.2.JPG" border=2></p>
<p align="center" class=figura>Fig. II.2. <i>The uicontext menu of a place</i><i>.</i></p>
<p class=figura-p> </p>
<p align="justify" class=figura id=move>After drawing a place, there are two ways to change
its position in the <b><i><a href="i4drawingarea.htm">Drawing Area</a></i></b>
while in <b><i><a href="petrinettoolboxatafirstglance.htm#Fig1">Draw Mode</a>
</i></b> and no button from the <b><i><a href="i5drawingpanel.htm">Drawing Panel</a></i></b>
is pressed. The first way is to left-click the desired place and then drag it
in the new position. The second way is to right-click the place; as a result,
a MATLAB uicontext menu (<a href="#FigII2">fig. II.2</a>) appears and the command
<em> <strong>Move Place</strong></em> becomes available. In both cases, the
label is moved together with the place.</p>
<p align="justify" class=figura> </p>
<p align="center" class=figura><img ID="FigII3" src="fig.II.3.JPG" alt="Fig. II.3. The Edit Place dialogue box for modifying the properties of a place">
</p>
<p align="center" class=figura>Fig. II.3. <i>The <b>Edit Place</b> dialogue box for modifying
the properties of a place</i>.</p>
<p align="center" class=figura> </p>
<p align="justify" class=figura>For a selected place, the uicontext menu also
allows: (<em>i</em>) controlling the label’s visibility on the screen
(<b><i>View Label</i></b> command), (<em>ii</em>) changing the position of the
label (<b><i>Move Label</i></b> command), (<em>iii</em>) deleting the place
(<b><i>Delete</i></b> command) and (<em>iv</em>) opening the <b><i>Edit Place</i></b>
dialogue box (<a href="#FigII3">fig. II.3</a>) that lets the user modify the
properties of the place as a MATLAB object (<b><i>Properties</i></b> command).</p>
<p> </p>
<p align="justify" class=normal>The <b><i>Edit Place</i></b> dialogue box may be also opened by one of the procedures (EP1) or (EP2) described below, followed by a click on the desired
place. (EP1) consists in selecting the <b><i><a href="i22modelingmenu.htm#EditObject">Edit
Objects</a></i></b> command from the <b><i><a href="i22modelingmenu.htm">Modeling</a></i></b>
menu; (EP2) consists in pressing the <b><i><a href="i5drawingpanel.htm">Edit
Objects</a></i></b> button from the <b><i><a href="i5drawingpanel.htm">Drawing
Panel</a></i></b>.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal> Each place is uniquely identified with an id
that is automatically assigned by the <b><i>PN Toolbox</i></b> and cannot be
changed by the user. This id appears in the title bar of the <b><i>Edit Place</i></b>
dialogue box.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="label"> The option <b><i>Label </i></b>displays the string
that is used as the label of the place. By default, this string coincides with
the id of the place. The user can modify this string (without affecting the
id) if necessary.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="color">The option <b><i>Color</i></b> displays the color
used for drawing the place. By default, this color is black, but the user can
select another one from a list of eight predefined colors. Using different colors
for drawing the places of a net might be helpful for complex topologies (e.g.
for highlighting different phases requested by a multi-step design procedure).</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="capacity">The option<b> </b><b><i>Capacity </i></b>displays
the capacity of the place. By default, the capacity is <b>Inf</b> (the IEEE
arithmetic representation for positive infinity). The user can set this field
to a positive integer value.</p>
<p class=normal> </p>
<p align="justify" class=normal id="tokens">The option<b> </b><b><i>Tokens </i></b>displays
the number of tokens in the place. By default, this number is 0. The user can
set this field to a positive integer value. If the marking of a place is greater
than 0, this marking is shown as a number inside the circle corresponding to
that position. Void marking is not explicitly shown.</p>
<p align="justify" class=figura-p> </p>
<p align="justify" class=figura-p>There are two more possibilities to add a token
to a place (AT1) or (AT2) described below, followed by a click on the desired
place. (AT1) consists in selecting the <b><i><a href="i22modelingmenu.htm#AddToken">Add
Token</a></i></b> command from the <b><i><a href="i22modelingmenu.htm">Modeling</a></i></b>
menu; (AT2) consists in pressing the <b><i><a href="i5drawingpanel.htm">Add
Token</a></i></b> button from the <b><i><a href="i5drawingpanel.htm">Drawing
Panel</a></i></b>.</p>
<p align="justify" class=figura-p> </p>
<p align="justify" class=normal id="distribution"> In case of place-timed PN models (see section
<a href="ii34ptimedpetrinets.htm"> <strong>P-timed Petri nets</strong></a>),
the <b><i>Time distribution </i></b>option<b> </b>associated with a place allows
the user to specify the probability distribution and the necessary parameter(s)
which define the corresponding time-duration. This option is not available for
untimed or transition-timed models.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal id="delete"> The <em><strong>Delete </strong></em><b><i>object
</i></b>button placed at the bottom of the <b><i>Edit Place</i></b> dialogue
box lets the user delete the place from the model.</p><hr>
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