feat: created StartScreen

really simple for now

core/src/sagittarius/SagittariusGame.java

@@ -9,6 +9,9 @@ import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.math.Vector2;
 import com.badlogic.gdx.math.Vector3;
 
+import sagittarius.view.*;
+import sagittarius.model.*;
+
 public class SagittariusGame extends Game {
 
 // ---------- ATTRIBUTEs ----------
@@ -31,7 +34,7 @@ public class SagittariusGame extends Game {
 
 	@Override
 	public void create() {
-		setScreen(new GameScreen());
+		setScreen(new StartScreen(this));
 
 		planetList = new ArrayList<Planet>();
 		planetList.add( new Planet(new Vector2(400, 400), 1000, 50) );

core/src/sagittarius/view/StartScreen.java

@@ -0,0 +1,75 @@
+package sagittarius.view;
+
+import com.badlogic.gdx.Game;
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.ScreenAdapter;
+import com.badlogic.gdx.scenes.scene2d.InputEvent;
+import com.badlogic.gdx.scenes.scene2d.Stage;
+import com.badlogic.gdx.scenes.scene2d.utils.ActorGestureListener;
+import com.badlogic.gdx.utils.viewport.FitViewport;
+import com.kotcrab.vis.ui.VisUI;
+import com.kotcrab.vis.ui.widget.VisTable;
+import com.kotcrab.vis.ui.widget.VisTextButton;
+
+public class StartScreen extends ScreenAdapter {
+
+    private static final float WORLD_WIDTH = 1600;
+    private static final float WORLD_HEIGHT = 900;
+
+    private final Game game;
+    private Stage stage;
+
+    public StartScreen(Game game) {
+        this.game = game;
+    }
+
+    public void show() {
+        stage = new Stage(new FitViewport(WORLD_WIDTH, WORLD_HEIGHT));
+        Gdx.input.setInputProcessor(stage);
+
+        VisUI.load();
+        VisTable root = new VisTable(true);
+        root.setFillParent(true);
+        stage.addActor(root);
+
+        VisTextButton startButton = new VisTextButton("start");
+        startButton.addListener(new ActorGestureListener() {
+            @Override
+            public void tap(InputEvent event, float x, float y, int count, int button) {
+                super.tap(event, x, y, count, button);
+                game.setScreen(new GameScreen());
+            }
+        });
+
+        VisTextButton quitButton = new VisTextButton("quit");
+        quitButton.addListener(new ActorGestureListener() {
+            @Override
+            public void tap(InputEvent event, float x, float y, int count, int button) {
+                super.tap(event, x, y, count, button);
+                Gdx.app.exit();
+            }
+        });
+
+        root.add(startButton);
+        root.row();
+        root.add(quitButton);
+        root.row();
+    }
+
+    public void resize(int width, int height) {
+        stage.getViewport().update(width, height, true);
+    }
+
+    public void render(float deltaTime) {
+        stage.act(deltaTime);
+        stage.draw();
+    }
+
+    @Override
+    public void dispose() {
+        VisUI.dispose();
+        stage.dispose();
+        super.dispose();
+    }
+
+}