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+# MVC pattern
+
+This application follows a MVC (Model-View-Controller) pattern for the GUI communication.
+
+![MVC pattern applied on this project](MVC_en.pdf)
+
+
+# Fireworks demonstration
+
+
+The goal of this demo is to bring out some fireworks using SARL agents.
+The application is composed of 4 agents. The whole structure holonic.
+
+![Agents organization in the fireworks demo](Firework_en.pdf| width=150px |height=300px)
+
+The main agent is the *LaunchingArea* which is linked with the GUI and and contains the other agents inside its inner context.
+This agent creates the *RocketLauncher*, one by rocket asked by the user. It also transmits the gravity and other parameters.
+This agent also registers the GUI on a dedicated OpenEventSpace for communication.
+
+```Scala
+agent LaunchingArea {
+
+	...
+
+	/*
+	 * Get setup event from the GUI
+	 */
+	on SetupSettings {
+		this.rocketsQuantity = occurrence.rocketsQuantity
+		this.fireQuantity = occurrence.fireQuatity
+		this.gravity = occurrence.gravity
+		this.maxWidth = occurrence.maxWidth
+	}
+
+	/*
+	 * Agent initialisation when spawned by the GUI
+	 * A communication space is opened between
+	 * 		the GUI and this agent
+	 */
+	on Initialize [!occurrence.parameters.empty] {
+		var ctrl = occurrence.parameters.get(0) as FXMLViewerController
+		var ispace = defaultContext.createSpace(
+			OpenEventSpaceSpecification, UUID.randomUUID)
+		ctrl.setGUISpace(ispace)
+		ispace.register(asEventListener)
+
+		ctrl.listenAndDraw(grid)
+
+		info("Finishing initialization of Launching Area")
+
+	}
+
+	...
+}
+```
+
+![Application with the GUI](firework_screenshot.png| width=350px | height=300px)
+
+Then, each RocketLauncher creates a *Rocket*. When this one is destroyed, the *RocketLauncher* is going to generate another one. This allows to displace the verification of the existence of the *Rocket* out of the LaunchingArea. It also isolates the *Rocket* and avoid that emitted events disrupt the managing of the simulation.
+
+```Scala
+agent RocketLauncher {
+
+	...
+
+	/*
+	 * A new rocket is launched when the previous
+	 * 		one is destroyed
+	 */
+	on MemberLeft [!isFromMe(occurrence) && !exited] {
+		// wake allows to send the event at the agent itself
+		wake(new Launch)
+	}
+	...
+}
+```
+
+*Rocket* agents are the heart of this demo. Each one create a task with a fixed delay where they updates their position by writing it in a object shared with the GUI, here named *Positions*. When the *Rocket* reach the end of its lifetime, they create *Fire* agent within their inner context according to the quantity asked by the user and then wait for the destruction of every *Fire* to kill themselves.
+
+```Scala
+agent Rocket {
+
+	...
+
+	on Initialize {
+
+		...
+
+		/*
+		 * Create a new background task to update
+		 *		the agent position at a fixed delay
+		 */
+		move = atFixedDelay(
+			Configuration.RocketLifeCycleSchedulingRate) [
+			try {
+				wake(new UpdateRocketPosition);
+			} catch (e : Exception) {
+				e.printStackTrace
+			}
+		]
+	}
+
+	on UpdateRocketPosition [isFromMe(occurrence) &&
+							 !frozen && !exploded] {
+		var vect = new Vector(2)
+		x = x + speedx
+		y = y + speedy
+		vect.clear()
+		vect.add(x)
+		vect.add(y)
+		lifetime = lifetime - 10
+
+		/* Updates the Position object */
+		if (grid !== null)
+			grid.setRocketPosition(id, vect)
+		if (lifetime <= 0) {
+			exploded = true
+			move.cancel(true)
+			grid.hideHocketPosition(id)
+			wake(new Explode)
+		}
+	}
+
+	...
+}
+
+```
+The *Fire* is the last agent of the demo. It have a list of positions and is subjected to gravity. As *Rocket* agent, the *Fire* launch a task at a fixed delay to update its actual position, add it at the end of the actual list and then update the *Positions* object. When its lifetime is over, the *Fire* is destroyed.
+
+When the GUI is closed, an event *Exit* is sent to the *LaunchingArea* which transmits it to the other agents she owns. It waits for their elimination to destroy the next one, until itself.
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