Implemented threading in Client

- GUI doesn't get blocked anymore
- Implemented client side protocol based control
- Client is now ready for player versus player

Client/src/render/Engine.java

@@ -0,0 +1,141 @@
+package render;
+
+import javafx.application.Application;
+import javafx.event.EventHandler;
+import javafx.geometry.Pos;
+import javafx.scene.Scene;
+import javafx.scene.input.MouseEvent;
+import javafx.scene.layout.GridPane;
+import javafx.scene.text.Font;
+import javafx.scene.text.FontWeight;
+import javafx.scene.text.Text;
+import javafx.stage.Stage;
+
+import java.awt.*;
+import java.util.concurrent.CountDownLatch;
+
+public class Engine extends Application {
+
+    private GridPane grid;
+    private Scene scene;
+    private static final CountDownLatch latch = new CountDownLatch(1);
+    private static Engine engine = null;
+    private boolean mouseClicked = false;
+    private Point coordinates = new Point();
+    private Stage primaryStage;
+    private MouseEvent mouseEvent;
+
+    public Engine() {
+        setEngine(this);
+    }
+
+    private void initializeGrid() {
+        grid = new GridPane();
+        grid.setPrefSize(900, 900);
+        grid.setAlignment(Pos.CENTER);
+        grid.setHgap(150);
+        grid.setVgap(75);
+    }
+
+    private Scene setScene() {
+        scene = new Scene(grid, 900, 900);
+        scene.getStylesheets().add("res/TicTacToe_Client.css");
+        scene.setOnMousePressed(new EventHandler<MouseEvent>() {
+            @Override
+            public void handle(MouseEvent event) {
+                onMouseClick(event);
+            }
+        });
+        return scene;
+    }
+
+    public static Engine waitForEngine() {
+        try {
+            latch.await();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+        return engine;
+    }
+
+    public static void setEngine(Engine new_engine) {
+        engine = new_engine;
+        latch.countDown();
+    }
+
+    public void updateTitle(String title){
+        System.out.println("title: " + title);
+        primaryStage.setTitle(title);
+    }
+
+    public void drawCross(int column, int row) {
+        Text cross = new Text("X");
+        cross.setFont(Font.font("Tahoma", FontWeight.NORMAL, 200));
+        grid.add(cross, column, row);
+    }
+
+    public void drawCircle(int column, int row) {
+        Text circle = new Text("O");
+        circle.setFont(Font.font("Tahoma", FontWeight.NORMAL, 200));
+        grid.add(circle, column, row);
+    }
+
+    public void drawEmptyField(int column, int row) {
+        Text emptyField = new Text("  ");
+        emptyField.setFont(Font.font("Tahoma", FontWeight.NORMAL, 220));
+        grid.add(emptyField, column, row);
+    }
+
+    public void drawBoard(String gameState) {
+        if (gameState.length() != 9) {
+            System.err.println("Wrong length of gameState string");
+            return;
+        }
+        for (int i = 0; i < gameState.length(); i++) {
+            int column = i / 3;
+            int row = i % 3;
+            if (gameState.charAt(i) == 'x') {
+                this.drawCross(column, row);
+            } else if (gameState.charAt(i) == 'o') {
+                this.drawCircle(column, row);
+            } else {
+                this.drawEmptyField(column, row);
+            }
+
+        }
+    }
+
+    private void onMouseClick(MouseEvent event) {
+        mouseClicked = true;
+        coordinates.setLocation(event.getX(), event.getY());
+        System.out.println(coordinates.getX() + ":" + coordinates.getY());
+    }
+
+    public boolean isMouseClicked() {
+        return mouseClicked;
+    }
+
+    public void setMouseClicked(boolean mouseClicked) {
+        this.mouseClicked = mouseClicked;
+    }
+
+    public Point getCoordinates() {
+        return coordinates;
+    }
+
+    @Override
+    public void start(Stage primaryStage) throws Exception {
+        //initialize window
+        this.primaryStage = primaryStage;
+        primaryStage.setTitle("Test");
+        primaryStage.setResizable(true);
+        this.initializeGrid();
+        primaryStage.setScene(this.setScene());
+        primaryStage.sizeToScene();
+        primaryStage.show();
+    }
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}