ftea: added Moons

core/src/sagittarius/Arrow.java

@@ -18,6 +18,10 @@ class Arrow extends Entity {
     float TTL = 20;
     private final float length = 100;
 
+    private boolean active = true;
+    private Planet crash;
+    private Vector2 offset = new Vector2();
+
 // ---------- CONSTRUCTORs ----------
 
     Arrow(float angle, float power, Player shooter) {
@@ -36,24 +40,40 @@ class Arrow extends Entity {
             Vector2 attraction = diff.scl( SagittariusGame.G * attractor.mass / diff.len2()  );
             force.add(attraction);
         }
+        for (Moon attractor : SagittariusGame.moonList) {
+            Vector2 diff = attractor.position.cpy().sub(this.position);
+            Vector2 attraction = diff.scl( SagittariusGame.G * attractor.mass / diff.len2()  );
+            force.add(attraction);
+        }
         return force;
     }
 
-    private boolean hasLanded() {
+    private void verifyActivity() {
         for (Planet planet : SagittariusGame.planetList) {
             if (this.distanceTo(planet) < planet.getRadius()) {
-                return true;
+                this.active = false;
+                this.crash = planet;
+                this.offset = this.position.cpy().sub(planet.position);
+            }
+        }
+        for (Moon moon : SagittariusGame.moonList) {
+            if (this.distanceTo(moon) < moon.getRadius()) {
+                this.active = false;
+                this.crash = moon;
+                this.offset = this.position.cpy().sub(moon.position);
             }
         }
-        return false;
     }
 
     void update(float deltaTime) {
 
-        if (!this.hasLanded()) {
+        if (this.active) {
+            verifyActivity();
             integrationVerlet(deltaTime);
             this.TTL -= deltaTime;
             this.angle = this.velocity.angleDeg();
+        } else {
+            this.position = crash.position.cpy().add(offset);
         }
     }
 
@@ -61,10 +81,6 @@ class Arrow extends Entity {
             // Verlet integration
             // https://gamedev.stackexchange.com/questions/15708/how-can-i-implement-gravity/41917#41917
 
-            // TODO : vectorialiser
-
-            // System.out.println(deltaTime);
-
             this.acceleration = this.force.cpy();
 
             this.position.x += deltaTime * ( this.velocity.x + deltaTime * this.acceleration.x / 2 );
@@ -84,7 +100,7 @@ class Arrow extends Entity {
     void renderDebug(Batch batch, BitmapFont font) {
 
         // TODO : dirty, do it in an other way
-        if (!hasLanded()) {
+        if (active) {
             font.draw(batch, "TTL   = " + this.TTL,             this.position.x, this.position.y + font.getCapHeight()*5);
             font.draw(batch, "pos   = " + this.position,        this.position.x, this.position.y + font.getCapHeight()*4);
             font.draw(batch, "speed = " + this.velocity,        this.position.x, this.position.y + font.getCapHeight()*3);
@@ -100,7 +116,8 @@ class Arrow extends Entity {
         ArrayList<Float> path = new ArrayList<Float>();
         Arrow dummyArrow = new Arrow(angle, power, shooter);
         for (int i = 0; i < iterations; i++) {
-            if (dummyArrow.hasLanded()) { break; }
+            dummyArrow.verifyActivity();
+            if (!dummyArrow.active) { break; }
             dummyArrow.integrationVerlet(timeStep);
             path.add(dummyArrow.position.x);
             path.add(dummyArrow.position.y);

core/src/sagittarius/Bow.java

@@ -53,7 +53,7 @@ class Bow {
         power = MathUtils.clamp(aim.len(), 0, 1000);
     }
 
-    public void render(ShapeRenderer shapeRenderer) {
+    void render(ShapeRenderer shapeRenderer) {
         if (pressed) {
             shapeRenderer.line(this.anchor, SagittariusGame.worldCursor);
             float[] traj = Arrow.traj(angle, power, shooter, 400, 0.05f);

core/src/sagittarius/Entity.java

@@ -15,6 +15,8 @@ abstract class Entity {
 
 // ---------- CONSTRUCTORs ----------
 
+    // TODO : reorganize all constructors
+
     protected Entity(Vector2 position, float mass) {
         this.position = position.cpy();
         this.mass = mass;

core/src/sagittarius/GameScreen.java

@@ -27,7 +27,7 @@ class GameScreen extends ScreenAdapter {
 
     // camera stuff
     private Viewport viewport;
-	public static Camera camera;
+	protected static Camera camera;
 
     // TODO: categorize better ?
     private HUD hud = new HUD();
@@ -62,6 +62,11 @@ class GameScreen extends ScreenAdapter {
             planet.renderDebug(batch, font);
         }
 
+        // moons
+        for (Moon moon : SagittariusGame.moonList) {
+            moon.renderDebug(batch, font);
+        }
+        
         // players
         for (Player player : SagittariusGame.playerList) {
             player.renderDebug(batch, font);
@@ -93,6 +98,11 @@ class GameScreen extends ScreenAdapter {
             arrow.render(shapeRenderer);
         }
 
+        // moons
+        for (Moon moon : SagittariusGame.moonList) {
+            moon.render(shapeRenderer);
+        }
+
         // float[] vertices = {100, 100, 200, 200, 1000, 500};
         // shapeRenderer.polyline(vertices);
 

core/src/sagittarius/HUD.java

@@ -17,11 +17,11 @@ class HUD implements Disposable {
 
 // ---------- METHODs ----------
 
-    public void update() {
+    void update() {
         frameRate = Gdx.graphics.getFramesPerSecond();
     }
 
-    public void render() {
+    void render() {
         batch.begin();
         
         // framerate

core/src/sagittarius/Moon.java

@@ -0,0 +1,38 @@
+package sagittarius;
+
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.math.MathUtils;
+
+class Moon extends Planet {
+
+    private Planet planet;
+    private float altitude;
+
+// ---------- CONSTRUCTORs ----------
+
+    Moon(Planet planet, float mass, float radius, float altitude) {
+        super(planet.position, mass, radius);
+        this.planet = planet;
+        this.altitude = altitude;
+    }
+
+    Moon(Planet planet, float mass, float radius, float altitude, Color color) {
+        super(planet.position, mass, radius, color);
+    }
+
+// ---------- METHODs ----------
+
+    void update(double deltaTime) {
+
+        this.angle += 10.0f / altitude;
+
+        this.position.x = planet.position.x + altitude*MathUtils.cosDeg(angle);
+        this.position.y = planet.position.y + altitude*MathUtils.sinDeg(angle);
+
+    }
+
+    Planet getPlanet() {
+        return this.planet;
+    }
+
+}

core/src/sagittarius/SagittariusGame.java

@@ -22,6 +22,7 @@ public class SagittariusGame extends Game {
 
 	// Entities
 	static ArrayList<Planet> planetList;
+	static ArrayList<Moon> moonList;
 	static ArrayList<Player> playerList;
 	static ArrayList<Arrow> arrowList;
 	
@@ -35,6 +36,9 @@ public class SagittariusGame extends Game {
 		planetList.add( new Planet(new Vector2(400, 400), 1000, 50) );
 		planetList.add( new Planet(new Vector2(1000, 400), 1000, 100, Color.CYAN) );
 
+		moonList = new ArrayList<Moon>();
+		moonList.add( new Moon(planetList.get(1), 100, 20, 300) );
+
 		playerList = new ArrayList<Player>();
 		playerList.add( new Player(planetList.get(0)) );
 	
@@ -53,6 +57,11 @@ public class SagittariusGame extends Game {
 			player.update(deltaTime);
 		}
 
+		// moons
+		for (Moon moon : moonList) {
+			moon.update(deltaTime);
+		}
+
 		// arrows
 		for (Iterator<Arrow> it = arrowList.iterator(); it.hasNext(); ) {
 			Arrow arrow = it.next();