ii13transitions.htm
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<title>II.1.3. Transitions</title>
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<p class=heading-2>II.1.3. Transitions</p>
<p class=heading-2-p> </p>
<p class=normal style="text-align: center;"> </p>
<p align="justify" class=figura>A transition is graphically represented in the
<b><i><a href="i4drawingarea.htm">Drawing Area</a></i></b> by a square. To draw
a transition 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 Transition</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#AddTransition">Add Transition</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 align="justify" class=figura-p> </p>
<p align="justify" class=figura> Once the square corresponding to a transition
is drawn, a label is automatically attached to it. The default position of the
label is below the square.</p>
<p class=figura> </p>
<p align="center" class=figura-p><img ID="FigII4" src="fig.II.4.JPG" border=2></p>
<p align="center" class=figura>Fig. II.4. <i>The uicontext menu of a transition.</i></p>
<p align="center" class=figura-p> </p>
<p align="justify" class=figura id="move"> The same as for a place, after drawing a transition,
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 transition
and then drag it in the new position. The second way is to right-click the transition;
as a result, a MATLAB uicontext menu (<a href="#FigII4">fig. II.4</a>) appears
and the command <em><strong>Move Transition</strong></em> becomes available.
In both cases, the label is moved together with the transition.</p>
<p align="justify" class=figura> </p>
<p align="justify" class=figura>For a selected transition, 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 transition
(<b><i>Delete</i></b> command) and (<em>iv</em>) opening the <b><i>Edit Transition</i></b>
dialogue box (<a href="#FigII5">fig. II.5</a>) that lets the user modify the
properties of the transition as a MATLAB object (<b><i>Properties</i></b> command).</p>
<p class=figura-p> </p>
<p align="center" class=figura><img ID="FigII5" src="fig.II.5.JPG" alt="Fig. II.5. The Edit Transition dialogue box for modifying the properties of a transition"></p>
<p align="center" class=figura>Fig. II.5. <i>The <b>Edit Transition</b> dialogue box for
modifying the properties of a transition</i>.</p>
<p align="center" class=figura> </p>
<p align="justify" class=figura>The <b><i>Edit Transition</i></b> dialogue box
can be also opened by one of the procedures (ET1) or (ET2) described below,
followed by a click on the desired transition. (ET1) consists in selecting the
<b><i><a href="i22modelingmenu.htm#EditObjects">Edit Objects</a></i></b> command
from the <b><i><a href="i22modelingmenu.htm">Modeling</a></i></b> menu; (ET2)
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=figura-p> </p>
<p align="justify" class=figura> Each transition 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 Transition</i></b>
dialogue box.</p>
<p align="justify" class=figura-p> </p>
<p align="justify" class=figura id="label"> The option <b><i>Label </i></b>displays the string
that is used as the label of the transition. By default, this string coincides
with the id of the transition. The user can modify this string (without affecting
the id) if necessary.</p>
<p align="justify" class=figura-p> </p>
<p align="justify" class=figura id="message"> The <b><i>Message </i></b>text-box contains the
string that is displayed in the <b><i><a href="i8statuspanel.htm#message">Message Box</a></i></b>
during the simulation of the model when firing that transition if option <b><i>Displayed</i></b>
is checked for <b><i>Transition-Firing Message</i></b> in the <b><i><a href="i25simulationmenu.htm#Pref">Preferences</a></i></b>
dialogue box. By default, this string is ⌨️ 快捷键说明
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