In order to make a trigger you first need to display the trigger window in the mission editor, this can be done by clicking the "Properties and Triggers / Mission Obj. The trigger window with a blank trigger (Trigger_01 selected), other triggers and categories are for demonstration purposes Be aware that if a trigger is created without conditions and "enableAfterComplete" is ticked then the trigger will run forever, repeatedly every time this event occurs (for a default trigger this means it would carry out its actions once a second, every second for the entirety of the mission, unless it is disabled by another trigger). If a trigger is created with no conditions then it will carry out its actions whenever it is executed, this is useful for triggers which always need to run, for example, a trigger to draw various lines on the mini-map at the start of the mission. Triggers can be assigned multiple events, conditions and actions. If there are no elseActions then the trigger will do nothing when the condition is not met. Actions can also be assigned as "elseActions" which instead of being carried out when the condition is met, will be carried out when the trigger is executed, but the condition is not met. Finally, actions define what the trigger does once it is executed and the condition is met for example "playHint" displays a message on the user's screen and "unitDamage" can be used to damage part of, or destroy a unit.
Once a trigger is executed a condition determines whether the trigger should continue to carry out the actions assigned to it, or should not do anything / carry out any else actions assigned to it for example the "UnitInArea" condition will carry out the triggers actions if the specified unit is within the specified area at the moment the trigger is executed. An event is what causes the trigger to execute, for example, the "periodicEvent" event will execute the trigger according to the specified interval (for example once a second, or once every 15 seconds).
Triggers consist of three main components (also known as elements): Events, Conditions, and Actions. As well as being useful for making more advanced single-player missions an understanding of triggers is a necessity for creating multi-player user missions, as such missions require triggers to function. Triggers are a feature of the Mission Editor which allow for vastly more complicated missions to be created, they can be used for scripted events, as well as for enabling more advanced mission features such as capture points, spawn points, visible way-points, and much more. 5.1.1.2 Matching the capture zone circle with the capture area.5.1.1.1 Drawing the capture zone circle.
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