feat: basic drawing

core/src/bzh/fainsin/sagittarius/Entity.java

@@ -0,0 +1,58 @@
+package bzh.fainsin.sagittarius;
+
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.math.Vector2;
+
+abstract class Entity {
+    
+// ---------- ATTRIBUTs ----------
+
+    protected Vector2 position;
+    
+    protected float mass = 1.0f;
+    protected float angle;
+    protected Color color = Color.WHITE;
+
+// ---------- CONSTRUCTORs ----------
+
+    protected Entity(Vector2 position, float mass) {
+        this.position = position;
+        this.mass = mass;
+    }
+
+    protected Entity(Vector2 position, float mass, Color color) {
+        this(position, mass);
+        this.color = color;
+    }
+
+// ---------- GETs ----------
+
+
+    Vector2 getPosition() {
+        return this.position;
+    }
+    
+    float getMass() {
+        return this.mass;
+    }
+
+    float getAngle() {
+        return this.angle;
+    }
+    
+    Color getColor() {
+        return this.color;
+    }
+
+// ---------- METHODs ----------
+
+    /**
+     * Return the euclidian distance to another entity
+     * @param entity
+     * @return distance to entity
+     */
+    float distanceTo(Entity entity) {
+        return this.position.sub(entity.getPosition()).len();
+    }
+
+}

core/src/bzh/fainsin/sagittarius/GameScreen.java

@@ -0,0 +1,105 @@
+package bzh.fainsin.sagittarius;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.ScreenAdapter;
+import com.badlogic.gdx.graphics.Camera;
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.GL20;
+import com.badlogic.gdx.graphics.OrthographicCamera;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+import com.badlogic.gdx.utils.viewport.FitViewport;
+import com.badlogic.gdx.utils.viewport.Viewport;
+
+class GameScreen extends ScreenAdapter {
+
+// ---------- ATTRIBUTES ----------
+
+    // screen size
+	static final int WIDTH = 1920;
+	static final int HEIGHT = 1080;
+
+    // drawing stuff
+	private SpriteBatch batch;
+	private ShapeRenderer shapeRenderer;
+    private BitmapFont font;
+
+    // camera stuff
+    private Viewport viewport;
+	public static Camera camera;
+
+    // TODO: categorize better ?
+    private HUD hud = new HUD();
+
+// ---------- METHODS ----------
+
+    private void clearScreen() {
+        Gdx.gl.glClearColor(Color.BLACK.r, Color.BLACK.g, Color.BLACK.b, Color.BLACK.a);
+        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
+    }
+
+    private void update(float delta) {
+        SagittariusGame.update(delta);
+        hud.update();
+        camera.update();
+    }
+
+    @Override
+    public void render(float delta) {
+
+        update(delta);
+
+        clearScreen();
+
+        // ---------- batch draw ----------
+        batch.setProjectionMatrix(camera.combined);
+        batch.begin();
+
+            // ---------- HUD ----------
+            hud.render(batch, font);
+        
+        batch.end();
+
+        // ---------- shapeRenderer draw ----------
+        shapeRenderer.setProjectionMatrix(camera.combined);
+        shapeRenderer.begin(ShapeRenderer.ShapeType.Line);
+
+            // ---------- planets ----------
+            for (Planet planet : SagittariusGame.planetList) {
+                planet.render(shapeRenderer);
+            }
+
+        shapeRenderer.end();
+
+    }
+
+    @Override
+    public void show() {
+        camera = new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
+        camera.position.set(WIDTH / 2, HEIGHT / 2, 0);
+        camera.update();
+
+        viewport = new FitViewport(WIDTH, HEIGHT, camera);
+
+        shapeRenderer = new ShapeRenderer();
+        batch = new SpriteBatch();
+        font = new BitmapFont();
+    }
+
+	@Override
+	public void resize(int width, int height) {
+		viewport.update(width, height);
+        camera.update();
+        batch.setProjectionMatrix(camera.combined);
+        shapeRenderer.setProjectionMatrix(camera.combined);
+    }
+
+    @Override
+    public void dispose() {
+        batch.dispose();
+        font.dispose();
+        shapeRenderer.dispose();
+    }
+
+}

core/src/bzh/fainsin/sagittarius/HUD.java

@@ -0,0 +1,23 @@
+package bzh.fainsin.sagittarius;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+
+class HUD {
+
+// ATTRIBUTS
+
+    private int frameRate;
+
+// MÉTHODES
+
+    public void update() {
+        frameRate = Gdx.graphics.getFramesPerSecond();
+    }
+
+    public void render(Batch batch, BitmapFont font) {
+        font.draw(batch, frameRate + " fps", 3, GameScreen.HEIGHT - 3);
+    }
+
+}

core/src/bzh/fainsin/sagittarius/Planet.java

@@ -0,0 +1,42 @@
+package bzh.fainsin.sagittarius;
+
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+import com.badlogic.gdx.math.Vector2;
+
+class Planet extends Entity {
+
+// ---------- ATTRIBUTEs ----------
+        
+    private float radius = 10;
+
+// ---------- CONSTRUCTORs ----------
+
+    Planet(Vector2 position, float mass, float radius) {
+        super(position, mass);
+        this.radius = radius;
+    }
+
+    Planet(Vector2 position, float mass, float radius, Color color) {
+        super(position, mass, color);
+        this.radius = radius; 
+    }
+
+// ---------- METHODS ----------
+
+    void render(ShapeRenderer shapeRenderer) {
+        shapeRenderer.setColor(color);
+		shapeRenderer.circle(this.position.x, this.position.y, radius);
+	}
+
+    void renderDebug(Batch batch, BitmapFont font) {
+        font.draw(batch, "x = " + (int) position.x + ", y = " + (int) position.y, position.x, position.y);
+    }
+
+    float getRadius() {
+        return this.radius;
+    }
+
+}

core/src/bzh/fainsin/sagittarius/SagittariusGame.java

@@ -1,33 +1,40 @@
 package bzh.fainsin.sagittarius;
 
-import com.badlogic.gdx.ApplicationAdapter;
+import java.util.ArrayList;
+
+import com.badlogic.gdx.Game;
 import com.badlogic.gdx.Gdx;
-import com.badlogic.gdx.graphics.GL20;
-import com.badlogic.gdx.graphics.Texture;
-import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.math.Vector2;
+import com.badlogic.gdx.math.Vector3;
 
-public class SagittariusGame extends ApplicationAdapter {
-	SpriteBatch batch;
-	Texture img;
+public class SagittariusGame extends Game {
+
+// ---------- ATTRIBUTEs ----------
+
+	// Vectors
+	static Vector2 screenCursor;
+	static Vector2 worldCursor;
+
+	// Planets
+	static ArrayList<Planet> planetList;
 	
-	@Override
-	public void create () {
-		batch = new SpriteBatch();
-		img = new Texture("badlogic.jpg");
-	}
+// ---------- METHODs ----------
 
 	@Override
-	public void render () {
-		Gdx.gl.glClearColor(1, 0, 0, 1);
-		Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
-		batch.begin();
-		batch.draw(img, 0, 0);
-		batch.end();
+	public void create() {
+		setScreen(new GameScreen());
+		
+		planetList = new ArrayList<Planet>();
+		planetList.add( new Planet(new Vector2(100, 100), 1, 50) );
 	}
+
+	static void update(float delta) {
+
+		// ---------- cursors ----------
+		screenCursor = new Vector2(Gdx.input.getX(), Gdx.input.getY());
+		Vector3 unprojectedCursor = GameScreen.camera.unproject(new Vector3(screenCursor, 0));
+		worldCursor = new Vector2(unprojectedCursor.x, unprojectedCursor.y);
 	
-	@Override
-	public void dispose () {
-		batch.dispose();
-		img.dispose();
 	}
+
 }