feat(FireParticle): Implement Fire particle behavior

- Add `FireParticleBehavior` 
- fix some behavior processing.

fix #84

src/main/java/fr/snapgames/fromclasstogame/core/behaviors/particle/BasicParticleBehavior.java

@@ -12,24 +12,49 @@
 public class BasicParticleBehavior implements Behavior<Particle> {
 
     private ParticleSystem parent;
+    private int defaultLifeTime = 1000;
+    private Color defaultColor = Color.WHITE;
 
-    public BasicParticleBehavior(ParticleSystem ps) {
+    public BasicParticleBehavior(ParticleSystem ps, int defaultLifeTime) {
         super();
         this.parent = ps;
+        this.defaultLifeTime = defaultLifeTime;
     }
 
     @Override
     public void onCreate(Particle p) {
         Behavior.super.onCreate(p);
         p.alive = true;
-        p.life = 1000;
+        p.life = defaultLifeTime;
         p.color = Color.WHITE;
-        p.setSize(1 + (int) (Math.random() * 5));
+        p.setSize(2 + (int) (Math.random() * 5));
         p.setPosition(parent.position);
         p.setAcceleration(Utils.randV2d(-1, 1, -1, 1));
 
     }
 
+    /**
+     * Define the default Color for the new particle
+     *
+     * @param c
+     * @return
+     */
+    public BasicParticleBehavior setColor(Color c) {
+        this.defaultColor = c;
+        return this;
+    }
+
+    /**
+     * Set the default lifetime t for the new particle.
+     *
+     * @param t
+     * @return
+     */
+    public BasicParticleBehavior setLifeTime(int t) {
+        this.defaultLifeTime = t;
+        return this;
+    }
+
     @Override
     public void onInput(Particle go, ActionHandler ih) {
 
@@ -40,10 +65,8 @@ public void onUpdate(Particle go, long dt) {
         if (go.alive) {
             go.life = go.life - 1;
             go.setPosition(parent.position);
-        }
-        if (go.life < 0) {
-            go.alive = false;
-            go.life = 0;
+        } else if (go.life < 0) {
+            this.onCreate(go);
         }
     }
 

src/main/java/fr/snapgames/fromclasstogame/core/behaviors/particle/FireParticleBehavior.java

@@ -0,0 +1,30 @@
+package fr.snapgames.fromclasstogame.core.behaviors.particle;
+
+import fr.snapgames.fromclasstogame.core.behaviors.Behavior;
+import fr.snapgames.fromclasstogame.core.entity.particles.Particle;
+import fr.snapgames.fromclasstogame.core.gfx.Render;
+import fr.snapgames.fromclasstogame.core.io.ActionHandler;
+
+public class FireParticleBehavior implements Behavior<Particle> {
+
+    @Override
+    public void onInput(Particle go, ActionHandler ih) {
+
+    }
+
+    @Override
+    public void onUpdate(Particle go, long dt) {
+        go.velocity = go.acceleration.multiply(dt).multiply(0.5);
+        go.position = go.velocity.multiply(dt);
+    }
+
+    @Override
+    public void onRender(Particle go, Render r) {
+
+    }
+
+    @Override
+    public void onAction(Particle go, ActionHandler.ACTIONS action) {
+
+    }
+}

src/main/java/fr/snapgames/fromclasstogame/core/entity/particles/ParticleSystem.java

@@ -15,6 +15,7 @@ public class ParticleSystem extends GameObject {
 
     public ParticleSystem(String objectName, Vector2d pos) {
         super(objectName, pos);
+        this.life = 10000;
     }
 
 
@@ -48,7 +49,7 @@ public ParticleSystem addParticleBehavior(Behavior<Particle> bp) {
     @Override
     public List<String> getDebugInfo() {
         List<String> ls = super.getDebugInfo();
-        ls.add(String.format("NbPtl:"+this.nbMaxParticle));
+        ls.add(String.format("NbPtl:" + this.nbMaxParticle));
         return ls;
     }
 }

src/main/java/fr/snapgames/fromclasstogame/core/physic/PhysicEngine.java

@@ -88,6 +88,11 @@ private void update(GameObject go, long dt) {
             go.position.x += ceilMinMaxValue(go.velocity.x * dtCorrected, 0.1, world.maxVelocity);
             go.position.y += ceilMinMaxValue(go.velocity.y * dtCorrected, 0.1, world.maxVelocity);
 
+            // apply Object behaviors computations
+            if (go.behaviors.size() > 0) {
+                go.behaviors.forEach(b -> b.onUpdate(go, dt));
+            }
+
 
             // test World space constrained
             verifyGameConstraint(go);

src/main/java/fr/snapgames/fromclasstogame/demo/scenes/DemoScene.java

@@ -134,12 +134,15 @@ public void create(Game g) throws UnknownResource {
         add(bckG);
 
         // add a ParticleSystem
-        ParticleSystem ps = new ParticleSystem("PS_test", player.position).create(100);
-        ps.addParticleBehavior(new BasicParticleBehavior(ps));
+        ParticleSystem ps = new ParticleSystem("PS_test", player.position);
+        ps.addParticleBehavior(
+                new BasicParticleBehavior(ps, 5000)
+                    .setColor(Color.RED));
         ps.add(new CopyObjectPosition(player));
         ps.setLayer(1);
         ps.setPriority(1);
         ps.setDebug(3);
+        ps.create(10);
         add(ps);
 
         // add score display.