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{{tag>dragonscript behavior}}
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[[:start|Start Page]] >> [[main|DragonScript Scripting Language]] >> [[dragengine:modules:dragonscript:abstractions|Abstraction Layers: How you want to build your Game]] >> [[dragengine:modules:dragonscript:behavior_elements|Behavior Elements]] >> **ECBehaviorLightDimmer**
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  * [[behaviors_use_cases|Behaviors Explained: By Use-Case]]
  * [[behaviors_a_to_z|Behaviors Explained: From A to Z]]

====== ECBehaviorLightDimmer ======

Behavior element behavior adding dimming support to [[behavior_light|ECBehaviorLight]].

This behavior modifies the light parameters of [[behavior_light|ECBehaviorLight]] instances present in the element to make lights gently raise and lower intensity when (de)activated.

To use this behavior add first an [[behavior_light|ECBehaviorLight]]. Adding ECBehaviorLightDimmer will then register itself as listener to the [[behavior_light|ECBehaviorLight]] and also set it to use custom light handling.

====== Instance Counts ======
This behavior can be used multiple times on an element to affect different lights. Use the behavior identifier to tell them apart.

====== Element Class Properties ======
Element class properties have the prefix ''lightDimmer.'' or ''lightDimmer({id}).'' if id is not empty.

===== timeRaise =====
Set time in seconds required to raise light intensity to full brightness.
  * Full name: ''lightDimmer.timeRaise'' or ''lightDimmer({id}).timeRaise''
  * Type: float
  * Default Value: 1
  * Restriction: At least 0
  * Example (*.deeclass) <code xml><float name='lightDimmer.timeRaise'>0.5</float></code>

===== timeLower =====
Set time in seconds required to lower light intensity to 0 intensity.
  * Full name: ''lightDimmer.timeLower'' or ''lightDimmer({id}).timeLower''
  * Type: float
  * Default Value: 1
  * Restriction: At least 0
  * Example (*.deeclass) <code xml><float name='lightDimmer.timeLower'>0.5</float></code>

====== Events ======

This behavior has no events.

====== Required Behaviors ======

  * [[behavior_light|ECBehaviorLight]]: Light to manipulate.

====== Optional Behaviors ======

This behavior does not support optional behaviors.

====== Persistency ======

This behavior does support element class to be persistable (setPersistable).

====== API Documentation ======

#@LinkApiDocDEDS2_HTML~classDragengine_1_1Scenery_1_1ECBehaviorLightDimmer.html,ECBehaviorLightDimmer~@#.

Since DragonScript Module Version ''1.0''

====== Use Cases ======

  * Change light switch on and off to gradually fade in and out.

====== Element Class Example ======

This example defines an element which contains a light with dimming support.

<code>
class MyElement extends BehaviorElementClass
  public var ECBehaviorLight light
  public var ECBehaviorLightDimmer lightDimmer
  func new()
    light = ECBehaviorLight.new(this, null)
    lightDimmer = ECBehaviorLightDimmer.new(this, light)
    lightDimmer.getTimeRaise().setValue(2)
    lightDimmer.getTimeLower().setValue(0.5)
  end
end
</code>

====== Behavior Factory ======

Using element class supporting adding behaviors the behavior can be added like this:
<code xml>
<?xml version='1.0' encoding='UTF-8'?>
<elementClass name='MyClass' class='GenericBehaviorElement'>
  <behavior type='ECBehaviorLight'/>
  
  <behavior type='ECBehaviorLightDimmer'>
    <!-- optional: use light with id instead of empty string -->
    <string name='light'>second</string>
    
    <!-- set element properties. omit property prefix if used inside behavior tag -->
    <float name='.timeRaise'>1.5</float>
  </behavior>
  
  <!-- for adding multiple behaviors use unique identifiers -->
  <behavior type='ECBehaviorLightDimmer' id='second'/>
</elementClass>
</code>

====== Live Examples ======

  * [[https://github.com/LordOfDragons/deexamples|DEExamples Repository]]
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