Add EntityFactory, player can now shoot bullets

Add DEBUG Constant + rendering of FPS when true

core/src/com/me/asteroids/Constants.java

@@ -2,6 +2,8 @@ package com.me.asteroids;
 
 public class Constants {
 
+    public static final boolean DEBUG = false;
+
     public static final int WIDTH = 800;
     public static final int HEIGHT = 600;
 

core/src/com/me/asteroids/EntityFactory.java

@@ -0,0 +1,73 @@
+package com.me.asteroids;
+
+import com.badlogic.gdx.math.Polygon;
+import com.badlogic.gdx.math.Vector2;
+import com.me.asteroids.components.AccelerationComponent;
+import com.me.asteroids.components.ModelComponent;
+import com.me.asteroids.components.PlayerComponent;
+import com.me.asteroids.components.PositionComponent;
+import com.me.asteroids.components.VelocityComponent;
+import com.me.common.ecs.Engine;
+import com.me.common.ecs.Entity;
+
+public class EntityFactory {
+
+    public static Entity createPlayer(Engine engine) {
+        PositionComponent position = new PositionComponent();
+        position.position = new Vector2(Constants.HALF_WIDTH, Constants.HALF_HEIGHT);
+        position.rotation = 90;
+
+        VelocityComponent velocity = new VelocityComponent();
+        velocity.velocity = new Vector2(0f, 0f);
+        velocity.maxVelocity = 400f;
+
+        ModelComponent model = new ModelComponent();
+        model.model = new Polygon(new float[] {
+                0f, 4f,         // tip
+                -2.5f, -4f,     // bottom left
+                -1f, -2.5f,     // indent
+                1f, -2.5f,      // indent
+                2.5f, -4f,      // bottom right
+        });
+        model.model.scale(5);
+
+        AccelerationComponent accel = new AccelerationComponent();
+        accel.acceleration = new Vector2(0,1f);
+
+        Entity player = engine.createEntity();
+        player.addComponent(position);
+        player.addComponent(velocity);
+        player.addComponent(model);
+        player.addComponent(accel);
+        player.addComponent(new PlayerComponent());
+        return player;
+    }
+
+    public static Entity createBullet(Engine engine, Entity player) {
+        PositionComponent position = new PositionComponent();
+        float[] modelVertices = player.getComponent(ModelComponent.class).model.getTransformedVertices();
+        position.position = new Vector2(modelVertices[0], modelVertices[1]);
+        position.rotation = player.getComponent(PositionComponent.class).rotation;
+
+        VelocityComponent velocity = new VelocityComponent();
+        velocity.velocity = Utils.setUnitVectorAngle(new Vector2(), position.rotation).scl(500);
+
+        ModelComponent model = new ModelComponent();
+        model.model = new Polygon(new float[] {
+                -1f, 2f,
+                1f, 2f,
+                1f, -2f,
+                -1f, -2f,
+        });
+        model.model.setRotation(position.rotation);
+        model.model.setPosition(position.position.x, position.position.x);
+
+
+        Entity bullet = engine.createEntity();
+        bullet.addComponent(position);
+        bullet.addComponent(velocity);
+        bullet.addComponent(model);
+        return bullet;
+    }
+
+}

core/src/com/me/asteroids/screens/GameScreen.java

@@ -1,8 +1,11 @@
 package com.me.asteroids.screens;
 
-import com.badlogic.gdx.math.Polygon;
+import com.badlogic.gdx.Gdx;
-import com.badlogic.gdx.math.Vector2;
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 import com.me.asteroids.Constants;
+import com.me.asteroids.EntityFactory;
 import com.me.asteroids.Graphics;
 import com.me.asteroids.components.AccelerationComponent;
 import com.me.asteroids.components.ModelComponent;
@@ -23,12 +26,19 @@ public class GameScreen extends Screen {
 
     Graphics graphics;
 
+    SpriteBatch batch;
+    BitmapFont font;
+
     public GameScreen(Graphics graphics) {
         this.graphics = graphics;
     }
 
     @Override
     public void setup() {
+        batch = new SpriteBatch();
+        font = new BitmapFont();
+        font.setColor(Color.RED);
+
         engine = new Engine();
 
         engine.registerComponentClass(PlayerComponent.class);
@@ -44,36 +54,7 @@ public class GameScreen extends Screen {
 
         engine.ready();
 
-        Entity player = engine.createEntity();
+        Entity player = EntityFactory.createPlayer(engine);
-
-        PositionComponent position = new PositionComponent();
-        position.position = new Vector2(Constants.HALF_WIDTH, Constants.HALF_HEIGHT);
-        position.rotation = 90;
-        player.addComponent(position);
-
-        VelocityComponent velocity = new VelocityComponent();
-        velocity.velocity = new Vector2(0f, 0f);
-        velocity.maxVelocity = 400f;
-        player.addComponent(velocity);
-
-        ModelComponent shape = new ModelComponent();
-        float[] vertices = new float[] {
-                0f, 4f,         // tip
-                -2.5f, -4f,     // bottom left
-                -1f, -2.5f,     // indent
-                1f, -2.5f,      // indent
-                2.5f, -4f,      // bottom right
-        };
-        shape.model = new Polygon(vertices);
-        shape.model.scale(5);
-        player.addComponent(shape);
-
-        AccelerationComponent accel = new AccelerationComponent();
-        accel.acceleration = new Vector2(0,1f);
-        player.addComponent(accel);
-
-        player.addComponent(new PlayerComponent());
-
         player.activate();
     }
 
@@ -81,6 +62,12 @@ public class GameScreen extends Screen {
     public void update(float dt) {
         graphics.reset();
         engine.update(dt);
+
+        if (Constants.DEBUG) {
+            batch.begin();
+            font.draw(batch, String.format("FPS: %d, Entities: %d", Gdx.graphics.getFramesPerSecond(), engine.getEntityCount()), 50, 50);
+            batch.end();
+        }
     }
 
     @Override

core/src/com/me/asteroids/systems/PlayerInputSystem.java

@@ -3,6 +3,7 @@ package com.me.asteroids.systems;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Input;
 import com.badlogic.gdx.math.Vector2;
+import com.me.asteroids.EntityFactory;
 import com.me.asteroids.Utils;
 import com.me.asteroids.components.AccelerationComponent;
 import com.me.asteroids.components.PlayerComponent;
@@ -60,6 +61,11 @@ public class PlayerInputSystem extends EntitySystem {
                 acceleration.set(0, 0);
             }
         }
+
+        if (Gdx.input.isKeyJustPressed(Input.Keys.SPACE)) {
+            Entity bullet = EntityFactory.createBullet(engine, entity);
+            bullet.activate();
+        }
     }
 
 }