對象不會碰撞

Question

我正在使用Javafx嘗試創建一個2D玩家，玩家（玩家等級）將能夠將一個箱子（食品類）移動到某個位置。我可以讓玩家與我想移動的圖像發生碰撞，但不會在網格上移動。我已經設置了一個system.out消息來充當一個調試器，但仍然沒有動作。

public class Game extends Application{ 
      Pane backgroundPane; 
      Pane playfieldLayer; 
      Pane scoreLayer; 

      Image playerImage; 
      Image foodImage; 

      List<Player> players = new ArrayList<>(); 
      List<Food> foods = new ArrayList<>(); 

      Text collisionText = new Text(); 
      boolean collision = false; 

      Scene scene; 

      @Override 

      public void start(Stage theStage) { 

       Group root = new Group(); 
       int columnAmount = 18; 
       int rowAmount = 18; 

       GridPane gameGrid = new GridPane(); 

       for (int i = 0; i < columnAmount; i++) { 
        ColumnConstraints columnn = new ColumnConstraints(45); 
        gameGrid.getColumnConstraints().add(columnn); 

       } 

       for (int i = 0; i < rowAmount; i++) { 
        RowConstraints row = new RowConstraints(45); 
        gameGrid.getRowConstraints().add(row); 
       } 

       gameGrid.setStyle("-fx-background-color: white; -fx-grid-lines-visible:true"); 


      root.getChildren().add(gameGrid); 
       // create layers 
       backgroundPane = new Pane(); 
       backgroundPane.setId("root"); 
       playfieldLayer = new Pane(); 
       scoreLayer = new Pane(); 

       root.getChildren().add(backgroundPane); 
       root.getChildren().add(playfieldLayer); 
       root.getChildren().add(scoreLayer); 

       scene = new Scene(root, Settings.SCENE_WIDTH, Settings.SCENE_HEIGHT); 
       backgroundPane.getStylesheets().addAll(this.getClass().getResource("application.css").toExternalForm()); 

       theStage.setResizable(false); 
       theStage.setScene(scene); 
       theStage.show(); 

       loadGame(); 
       createPlayers(); 

       AnimationTimer gameLoop = new AnimationTimer() { 

        @Override 
        public void handle(long now) { 

         // player input 
         players.forEach(sprite -> sprite.processInput()); 
         spawnFood(); 

         players.forEach(sprite -> sprite.move()); 
         foods.forEach(sprite -> sprite.move()); 


         checkCollisions(); 

         players.forEach(sprite -> sprite.updateUI()); 
         foods.forEach(sprite -> sprite.updateUI()); 
        } 
       }; 
       gameLoop.start(); 
      } 

      private void loadGame() { 
       playerImage = new Image(getClass().getResource("warehouse.png").toExternalForm()); 
       //enemyImage = new Image(getClass().getResource("enemy.png").toExternalForm()); 
       foodImage = new Image(getClass().getResource("food.png").toExternalForm()); 
      } 

      private void createPlayers() { 
       // player input 
       Input input = new Input(scene); 

       // register input listeners 
       input.addListeners(); // TODO: remove listeners on game over 

       Image image = playerImage; 

       // center horizontally, position at 70% vertically 
       double x = (Settings.SCENE_WIDTH - image.getWidth())/2.0; 
       double y = Settings.SCENE_HEIGHT * 0.7; 

       // create player 
       Player player = new Player(playfieldLayer, image, x, y, 0, 0, 0, Settings.PLAYER_SPEED, input); 

       // register player 
       players.add(player); 

      } 

      Input input = new Input(scene); 

     input.addListeners(); 


     Image image = foodImage; 

      double x = (Settings.SCENE_WIDTH - image.getWidth())/2.0; 
      double y = Settings.SCENE_HEIGHT * 0.2; 

     Food food = new Food(playfieldLayer, image, x,y,0,0, Settings.PLAYER_SHIP_SPEED, input); 

     foods.add(food); 

      private void checkCollisions() { 

       collision = false; 

       for(Player player: players) { 
        for(Food food: foods) { 
         if(player.collidesWith(food)) { 
          Food.collision = true; 
          food.updateUI(); 
          System.out.println("Collided"); 
         } 
        } 
       } 
      } 


      public static void main(String[] args) { 
       launch(args); 
      } 

    } 
    public abstract class SpriteBase { 
    public void move() { 
      if(!canMove) 
       return; 

      x += dx; 
      y += dy; 
     } 

    public void updateUI() { 
      imageView.relocate(x, y); 
    } 
    } 

public class Food extends SpriteBase { 
    double foodMinX; 
    double foodMaxX; 
    double foodMinY; 
    double foodMaxY; 
    double speed; 
    Input input; 

    static boolean collision; 

public Food(Pane layer, Image image, double x, double y, double dx, double dy, double speed, Input input) { 
     super(layer, image, x, y, dx, dy); 
     this.speed = speed; 
     this.input = input; 
     checkBounds1(); 
    } 

private void checkBounds1() { 
     // calculate movement bounds of the player ship 
     // allow half of the ship to be outside of the screen 
    foodMinX = 0 - image.getWidth()/2.0; 
    foodMaxX = Settings.SCENE_WIDTH - image.getWidth()/2.0; 
    foodMinY = 0 - image.getHeight()/2.0; 
    foodMaxY = Settings.SCENE_HEIGHT -image.getHeight()/2.0; 
    } 

public void processInput() { 
    if(input.isMoveUp() && collision != false) { 
     input.removeListeners(); 
     dy = -speed; 
     collision = false; 
     System.out.println("move up you bastard"); 
    } else if(input.isMoveDown() && collision != false) { 
     input.removeListeners(); 
     System.out.println("move up you bastard"); 
     dy = speed; 
     collision = false; 
    } else { 

     dy = 0d; 
    } 

    // horizontal direction 
    if(input.isMoveLeft() && collision == true) { 
     input.removeListeners(); 
     System.out.println("move up you bastard"); 
     collision = false; 
     dx = -speed; 
    } else if(input.isMoveRight() && collision == true) { 
     input.removeListeners(); 
     System.out.println("move up you bastard"); 
     collision = false; 
     dx = speed; 
    } else { 
     dx = 0d; 
    } 

    } 


@Override 
    public void move() { 
     super.move(); 
     // ensure the food can't move outside of the screen 
     checkBounds(); 
    } 

private void checkBounds() { 

     // vertical 
     if(Double.compare(y, foodMinY) < 0) { 
      y = foodMinY; 
     } else if(Double.compare(y, foodMaxY) > 0) { 
      y = foodMaxY; 
     } 

     // horizontal 
     if(Double.compare(x, foodMinX) < 0) { 
      x = foodMinX; 
     } else if(Double.compare(x, foodMaxX) > 0) { 
      x = foodMaxX; 
     } 
    } 

Answer 1

繼續評論。

當你調用方法spawnFood()，你是一個dx製作new Food()，和0dy值。所以它沒有移動的速度。

Food food = new Food(playfieldLayer, image, x,y,0,0); <--Here 

「但我在Player班上也這麼做！」 （編輯了）

Player player = new Player(playfieldLayer, image, x, y, 0, 0, 0, Settings.PLAYER_SPEED, input);<-- Here 

你在0通爲dx,dy當你創建Player爲好，除非你也傳遞給它Settings.PLAYER_SPEED，然後您可以在構造函數中設置。

public Player(Pane layer, Image image, double x, double y, double r, double dx, double dy, double speed, Input input) { 

    super(layer, image, x, y, dx, dy); 

    this.speed = speed; <--Here 
    this.input = input; 

    checkBounds1(); 
} 

你不這樣做在Food類。

public Food(Pane layer, Image image, double x, double y, double dx, double dy) { 
     super(layer, image, x, y, dx, dy); 
     /***** NOT HERE ****/ 
     checkBounds1(); 

    } 

我建議你spawnFood()方法改變dx,dy值，別的東西，或者也可以通過它的Settings.PLAYER_SPEED，因爲我想你要的食物留在字符的前面。