View source for How to Use Variables in Sessions (Examples)

The information in this Wiki Page applies to '''TANE''', '''TRS19''', '''Trainz Plus''' and '''TRS22'''. It gives examples of using variables in Sessions.
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<td>Variables store '''integer values''' in Sessions that can be used to:-
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<td>'''Test''' for certain events (e.g. if something has occurred a set number of times)</td>
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<td>[[image:BlueDot10x10.png|link=]]</td>
<td>Make decisions according to the value held by a variable</td>
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<td>[[image:BlueDot10x10.png|link=]]</td>
<td>Act as '''counters''' or '''score keepers'''</td>
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<td>[[image:BlueDot10x10.png|link=]]</td>
<td>Variables can be used for basic arithmetic by having set values added or subtracted</td>
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<td>[[image:BlueDot10x10.png|link=]]</td>
<td>Variables can have random values assigned to them</td>
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The scenarios shown below give examples of how variables can be used to control the operation of a session.
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='''Example 1: Random Passenger Stop'''=
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<td width=75>&nbsp;</td>
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<td><span style="font-weight: 700; font-size: 17px;">The Scenario:</span></td>
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<td>In the example shown below a random variable is to be used to decide which one of 3 stations a user controlled train will be required to stop at. The user will be informed of the decision, to stop or not, by a message placed on the screen before they reach each station.

When the train approaches the first possible stopping place, Sandplace, the session checks the value stored in "stopID" and if it is "1" then a stop will be requested.</td>
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<td>[[image:RandomLogic.jpg|link=]]</td>
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<td>If a stop is required then a predefined '''Navigation Point''' is shown to indicate the stopping place</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>The same logic is repeated for the other two stations with '''stopID''' values of "2" and "3"</td>
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<td width=60 rowspan=2>[[image:conditions.PNG|link=]]</td>
<td colspan=2><span style="font-size: 17px;">'''Preconditions:'''</span></td>
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<td>The '''[[Session_Rule_List_with_Parameters#Randomize_Rule|Randomize Rule]]''' is used at the start of the session to create a different sequence of random values each time the session is run</td>
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<td colspan=2>[[image:VariableRandom.jpg|link=]]</td>
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<td colspan=2>Setting the random variable '''stopID'''</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>The '''[[Session_Rule_List_with_Parameters#Navigation_Display_Rule|Navigation Display Rule]]''' is used to create three Navigation Point Sets, one for each stopping place</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>The '''[[Session_Rule_List_with_Parameters#Navigation_Set_Hide/Show_Rule|Navigation Set Hide/Show Rule]]''' is used to initially hide all three navigation sets</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>The '''[[Session_Rule_List_with_Parameters#Variable_Random_Rule|Variable Random Rule]]''' is used to create a variable, '''stopID''', with an integer random value from 1 to 3. Each number representing one of the stops</td>
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<td><span style="font-size: 17px;">'''Rules Used:'''</span></td>
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<td>'''[[Session_Rule_List_with_Parameters#Navigation_Display_Rule|Navigation Display Rule]]''' to create three Navigation Point Sets (in '''Preconditions''' above)</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Navigation_Set_Hide/Show_Rule|Navigation Set Hide/Show Rule]]''' to hide all three navigation sets (in '''Preconditions''' above) and to reveal one set identified by the random variable</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Variable_Random_Rule|Variable Random Rule]]''' to create the variable '''stopID''' (in '''Preconditions''' above)</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Trigger_Check_Rule|Trigger Check Rule]]''' to trigger the decision and message event</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Variable_Check_Rule|Variable Check Rule]]''' to check the value held in a session variable
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<td>[[image:VariableCheck.jpg|link=]]</td>
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<td>Checking the variable '''stopID''' for the first stopping place</td>
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<td>'''[[Session_Rule_List_with_Parameters#Message_Popup_Rule|Message Popup Rule]]''' to open a message window on the screen</td>
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<td><span style="font-size: 17px;">'''Session Editor Screenshot:'''</span></td>
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<td>[[image:AppRandomStop1.jpg|link=]]</td>
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<td><span style="font-size: 17px;">'''Description:'''</span></td>
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<td>'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;1&#160;</span>''': Trigger Check''' The event is triggered when the consist passes over a track trigger. This executes the following rules:-
:'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;2&#160;</span>''': Variable Check''' The value stored in the variable '''stopID''' is tested "=1". Lines 3 and 4 are executed only if '''stopID''' is '''equal to''' "1"
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;3&#160;</span>''': Navigation Set Hide/Show''' Displays a navigation point showing the stopping location
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;4&#160;</span>''': Message Popup''' Displays a message window showing that a stop has to be made at Sandplace
:'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;5&#160;</span>''': Variable Check''' The value stored in the variable '''stopID''' is tested "&lt;&gt;1". Line 6 is executed only if '''stopID''' is '''not equal''' to "1".
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;6&#160;</span>''': Message Popup''' Displays a message window showing that no stop has to be made at Sandplace</td>
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='''Example 2: Event Counter and Message Selection'''=
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<td width=75>[[image:NextUp.png|link=#stepEx1|alt=Next Up|Top]]</td>
<td width=75>[[image:NextDown.png|link=#stepEx3|alt=Next Down|Next Down]]</td>
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<td><span style="font-weight: 700; font-size: 17px;">The Scenario:</span></td>
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<td>Each time a user causes a SPAD (Signal Passed At Danger) at specific locations, the event is counted and an appropriate message is displayed on the screen. The tone of the messages becomes more severe with each occurance.</td>
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<td colspan=2><span style="font-size: 17px;">'''Preconditions:'''</span></td>
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<td>A variable, '''SetSPAD''' (value "0" or "1"), is used to indicate whether a SPAD event is to be counted and responded to or not. This is set to "0" or "1" by track triggers. Use the '''[[Session_Rule_List_with_Parameters#Variable_Modify_Rule|Variable Modify Rule]]''' to create and set this variable</td>
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<td>A variable, '''SPADCounter''', is used to count the SPAD events and is initially set at 0. Use the '''[[Session_Rule_List_with_Parameters#Variable_Modify_Rule|Variable Modify Rule]]''' to create and set this variable</td>
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<td><span style="font-size: 17px;">'''Rules Used:'''</span></td>
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<td>'''[[Session_Rule_List_with_Parameters#Signal_Passed_At_Danger_Check_Rule|Signal Passed At Danger Check Rule]]''' set to trigger on every SPAD event</td>
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<td>'''[[Session_Rule_List_with_Parameters#Variable_Check_Rule|Variable Check Rule]]''' to check the value held in a session variable</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Driver_Schedule_Rule|Driver Schedule Rule]]''' used to immediately stop the train</td>
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<td>[[image:DriverSchedule.jpg|link=]]</td>
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<td>Using the '''Driver Schedule Rule''' to halt the train</td>
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<td>'''[[Session_Rule_List_with_Parameters#Simultaneous_List_Rule|Simultaneous List Rule]]''' to force all rules to run simultaneously for speed</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Variable_Modify_Rule|Variable Modify Rule]]''' to alter the value held in a session variable</td>
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<td>'''[[Session_Rule_List_with_Parameters#Variable_Show_Rule|Variable Show Rule]]''' adds a session variable to the Heads Up Display</td>
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<td>'''[[Session_Rule_List_with_Parameters#Message_Popup_Rule|Message Popup Rule]]''' to open a message window on the screen</td>
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<td><span style="font-size: 17px;">'''Session Editor Screenshot:'''</span></td>
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<td>[[image:VariableSPADWarnings.jpg|link=]]</td>
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<td><span style="font-size: 17px;">'''Description:'''</span></td>
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<td>'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;1&#160;</span>''': Signal Passed At Danger''' The event is triggered every time a consist passes a signal (or stop sign) set at STOP. This executes the following lines:-
:'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;2&#160;</span>''': Variable Check''' The value stored in the variable '''SetSPAD''' is tested "=1". If true then the following lines are executed. This executes the following lines:-
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;3&#160;</span>''': Driver Schedule''' The current schedule (if any) for the user controlled driver is replaced with a '''Halt Train''' command to bring the train to an immediate stop
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;4&#160;</span>''': Variable Modify''' The value stored in the variable '''SPADCounter''' is increased by 1
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;5&#160;</span>''': Simultaneous List''' This forces all the '''Variable Check Rules''' to be run simultaneously. This is not strictly necessary but without it all the '''Variable Check Rules''' will be tested, one after the other, when only one (or none) of them will be executed. This will (marginally) speed up the processing. This will execute the following lines:-
:::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;6&#160;</span>''': Variable Check''' The value stored in the variable '''SPADCounter''' is tested "=1". If true then the first SPAD event has occurred and the following lines are executed:-
::::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;7&#160;</span>''': Variable Show''' The value stored in the variable '''SPADCounter''' is added to the '''Custom HUD'''. Each time the value changes it will be updated in the HUD
::::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;8&#160;</span>''': Message Popup''' The first warning message is shown on the screen
:::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;9&#160;</span>''': Variable Check''' The value stored in the variable '''SPADCounter''' is tested "=2". If true then the second SPAD event has occurred and the following line is executed:-
::::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;10&#160;</span>''': Message Popup''' The second warning message is shown on the screen</td>
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<td>Lines <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;9&#160;</span> and <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;10&#160;</span> are then repeated with variations as shown. If more than 5 SPADs occur, then no new messages will be shown (the driver is clearly taking no notice so what is the point?) but the '''SPADCounter''' will continue to be updated.
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='''Example 3: Counting Consist Checks'''=
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<td><span style="font-weight: 700; font-size: 17px;">The Scenario:</span></td>
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<td>The '''Consist Check Rule''' cannot be set to trigger only once but sometimes you want it triggered only once on (for example) the 2nd time that a particular consist is formed. This example uses a variable to count the number of times the rule has been triggered and acts only when a set count has been reached. It could easily be modified to trigger a set number of times.</td>
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<td colspan=2><span style="font-size: 17px;">'''Preconditions:'''</span></td>
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<td>A variable, '''ConsistCount''', is initially set to "0". Use the '''[[Session_Rule_List_with_Parameters#Variable_Modify_Rule|Variable Modify Rule]]''' to create and set this variable</td>
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<td><span style="font-size: 17px;">'''Rules Used:'''</span></td>
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<td>'''[[Session_Rule_List_with_Parameters#Consist_Check_Rule|Consist Check Rule]]''' set to trigger when a specific consist has been formed</td>
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<td>'''[[Session_Rule_List_with_Parameters#Variable_Modify_Rule|Variable Modify Rule]]''' to set and increase the value held in a session variable</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Variable_Check_Rule|Variable Check Rule]]''' to check the value held in a session variable</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Message_Popup_Rule|Message Popup Rule]]''' to place a message on the screen</td>
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<td><span style="font-size: 17px;">'''Session Editor Screenshot:'''</span></td>
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<td>[[image:VariableConsistCounter.JPG|link=]]</td>
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<td width=60 rowspan=3>[[image:explanation.PNG|link=]]</td>
<td><span style="font-size: 17px;">'''Description:'''</span></td>
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<td>'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;1&#160;</span>''': Consist Check Rule''' Triggered when the specified consist has been found. This executes the following lines:-
:'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;2&#160;</span>''': Variable Modify Rule''' Adds 1 to the variable '''ConsistCounter'''
:'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;3&#160;</span>''': Variable Check''' Compares the value stored in '''ConsistCounter''' to a set value (in this case 2). If it matches then the next line is executed:-
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;4&#160;</span>''': Places a message on the screen</td>
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='''Example 4: Train Status'''=
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<td width=75>[[image:NextUp.png|link=#stepEx3|alt=Next Up|Top]]</td>
<td width=75>[[image:NextDown.png|link=#stepRules|alt=Next Down|Next Down]]</td>
<td width=75>[[image:BackToBottom.png|link=#bottom|alt=Bottom|Bottom]]</td>
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<td><span style="font-weight: 700; font-size: 17px;">The Scenario:</span></td>
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<td>A consist identified by number 188 passes over the same trigger twice, once when empty and once when loaded. Each time the user needs to be given a different set of instructions</td>
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<td width=60 rowspan=4>[[image:conditions.PNG|link=]]</td>
<td colspan=2><span style="font-size: 17px;">'''Preconditions:'''</span></td>
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<td>A variable, '''T188Status''' is initially set to "1" signifying that the train is empty. This will be modified to "2" after it has been loaded. Use the '''[[Session_Rule_List_with_Parameters#Variable_Modify_Rule|Variable Modify Rule]]''' to create and set this variable</td>
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<td><span style="font-size: 17px;">'''Rules Used:'''</span></td>
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<td>'''[[Session_Rule_List_with_Parameters#Trigger_Check_Rule|Trigger Check Rule]]''' to trigger the event when the consist reaches the trigger</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Variable_Check_Rule|Variable Check Rule]]''' to check the value held in a session variable</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Message_Popup_Rule|Message Popup Rule]]''' to place a message on the screen</td>
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<td><span style="font-size: 17px;">'''Session Editor Screenshot:'''</span></td>
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<td>[[image:VariableTrainTrigger.JPG|link=]]</td>
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<td width=60 rowspan=3>[[image:explanation.PNG|link=]]</td>
<td><span style="font-size: 17px;">'''Description:'''</span></td>
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<td>'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;1&#160;</span>''': Trigger Check Rule''' Triggered by the train. This is '''NOT''' set to trigger once only. When triggered it will execute the following lines:-
:'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;2&#160;</span>''': Variable Check''' Compares the value stored in '''T188Status''' to 1, indicating "empty". If it matches then the next lines are executed:-
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;3&#160;</span>''': Message Popup''' Places a message on the screen
::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;4&#160;</span>''': Variable Check''' Compares the value stored in '''T188Status''' to 2, indicating "loaded". If it matches then the next line is executed:-
:::'''Line''' <span style="font-weight: 700; font-size: 15px; color: white; background-color: black;">&#160;5&#160;</span>''': Message Popup''' Places a message on the screen</td>
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='''Variable Rules and Commands'''=
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<td width=75>&nbsp;</td>
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<td>These are the '''Session Rules''' that can access, create and/or modify Session variables
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<td>'''[[Session_Rule_List_with_Parameters#Randomize_Rule|Randomize Rule]]''' - creates a different set of random numbers every time a session is run</td>
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<td>'''[[Session_Rule_List_with_Parameters#Variable Check Rule|Variable Check Rule]]''' - executes child rules according to the value of a specified variable</td>
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<td>'''[[Session_Rule_List_with_Parameters#Variable Modify Rule|Variable Modify Rule]]''' - changes the value of a specified variable and creates new variables by setting their initial values</td>
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<td>'''[[Session_Rule_List_with_Parameters#Variable Modify Continuous Rule|Variable Modify Continuous Rule]]''' - continuously changes the value of a specified variable</td>
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<td>'''[[Session_Rule_List_with_Parameters#Variable Random Rule|Variable Random Rule]]''' - assigns a random value to a variable</td>
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<td>[[image:DotPoint.JPG|10px|link=]]</td>
<td>'''[[Session_Rule_List_with_Parameters#Variable Show Rule|Variable Show Rule]]''' - adds or removes a specified variable and a descriptive label to the custom HUD</td>
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<td>These are the '''Driver Commands''' that can access Session variables. The [[image:WikiLink.PNG|link=]] '''[[Session Rule List with Parameters#InputTable Rule|InputTable Rule]]''' must be added to the Session and configured with the names of the variables before these Driver Commands can be used.
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<td>'''[[Driver_Commands_List#Skip if Session-Variable|Skip if Session Variable]]''' - conditionally jumps to the named command label in the Driver Command Bar if a selected session variable meets a set condition</td>
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<td>'''[[Driver_Commands_List#Wait Until S-Variable V3|Wait Until S-Variable V3]]''' - AI driver waits for the specified variable condition to occur</td>
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<td width=46>[[image:BackToTop.png|link=#top|alt=Top|Top]]</td>
<td width=75>[[image:NextUp.png|link=#stepRules|alt=Next Up|Top]]</td>
<td width=75>&nbsp;</td>
<td width=75>&nbsp;</td>
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='''Trainz Wiki'''=
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<td>[[image:TrainzWiki.png|link=]]</td>
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<span style="font-size: 17px;">'''More Tutorials and Guides to Using Trainz'''</span><br>
*'''<span class="plainlinks">[http://online.ts2009.com/mediaWiki/index.php/HowTo How to Guides]</span>'''
*'''[[Driver Commands List]]'''
*'''[[Session Rule List with Parameters|Session Rules List (Alphabetical) with Parameters]]'''
*'''[[Session Rules By Categories With Properties|Session Rules List (Categories) With Parameters]]'''
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This page was created by Trainz user '''<span class="plainlinks">[http://online.ts2009.com/mediaWiki/index.php/User:Pware pware]</span>''' in April 2018 and was last updated as shown below.
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[[Category:How-to guides]]