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PODrawing and deleting jlabels from a jpanel
 

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  1. PODrawing and deleting jlabels from a jpanel
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    <p>I am making a chess game gui by setting up a grid of jpanels with jlabels on top (the piece images). I set up the board with each square (jpanel) having an empty jlabel w/ visibility set to false. I then go through each of the jpanels and set the jlabel picture to an image corresponding to one of my pieces. I know whether or not to draw a piece because I have a variable _board[8][8] that tells me if that spot is occupied and by whom. This is how I create the original board:</p> <p>EDIT:</p> <p>I actually changed this up quite a bit, that way I don't have to reload images each time:</p> <pre><code>public ChessGameGUI(Square[][] board) throws IOException { Dimension size = new Dimension(500, 400); Dimension boardSize = new Dimension(400, 400); layeredPane = new JLayeredPane(); getContentPane().add(layeredPane); layeredPane.setPreferredSize(size); theBoard = new JPanel(); layeredPane.add(theBoard, JLayeredPane.DEFAULT_LAYER); layeredPane.addMouseListener(this); GridLayout chessBoardLayout = new GridLayout(8,8); theBoard.setLayout(chessBoardLayout); theBoard.setPreferredSize(boardSize); theBoard.setBounds(0, 0, boardSize.width, boardSize.height); boolean drawWhite = true; // setup initial squares for(int y = 0; y &lt; 8; y++) { for(int x = 0; x &lt; 8; x++) { BorderLayout squareBorder = new BorderLayout(); JPanel aChessSquare = new JPanel(squareBorder); if(drawWhite) aChessSquare.setBackground(Color.WHITE); else aChessSquare.setBackground(Color.GRAY); // load initial images if(board[x][y]._isOccupied) { BufferedImage logo = null; try{ // load the image String path = findPieceImagePath(board, x, y); logo = ImageIO.read(new File(path)); ImageIcon pieceImage = new ImageIcon(logo); JLabel pieceJLabel = new JLabel(); pieceJLabel.setIcon(pieceImage); // new pieceJLabel.setVisible(true); // new aChessSquare.add(pieceJLabel); } catch (IOException e) { e.printStackTrace(); } // end try catch }// end if else { JLabel pieceJLabel = new JLabel(); pieceJLabel.setVisible(false); aChessSquare.add(pieceJLabel); } theBoard.add(aChessSquare); // alternate background colors if(x == 7); else drawWhite = !drawWhite; } } System.out.println("the number of components = " + theBoard.getComponentCount()); } </code></pre> <p>This loads the initial board just fine, however I can't seem to get a specific component. When I click on one of the pieces, that square should light up. The only square that ever gets the green outline is the one in the top left (0, 0).</p> <pre><code>public void mousePressed(MouseEvent e) { System.out.println("mouse press x = " + e.getX() + " y = " + e.getY()); // find which piece on the board is being clicked int gameX, gameY; gameX = e.getX() / 50; gameY = e.getY() / 50; System.out.println("gameX = " + gameX + " gameY = " + gameY); // out of bounds if(gameX &lt; 0 || gameY &lt; 0) return; // true if selected a piece on this team if(myGame._board[gameX][gameY]._isOccupied &amp;&amp; !_pieceSelected &amp;&amp; myGame._board[gameX][gameY]._team == myGame._turn) { System.out.println("selected new piece"); JPanel curSquare = (JPanel)theBoard.getComponentAt(gameX, gameY); curSquare.setBorder(BorderFactory.createLineBorder(Color.green)); _pieceSelected = !_pieceSelected; return; } </code></pre> <p>I guess I am having problems with this line: JPanel curSquare = (JPanel)theBoard.getComponentAt(gameX, gameY);</p> <p>however, the gameX and gameY values are being set properly.</p> <p>Thanks</p>
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    1. USthebiglebowski11
    1. USthebiglebowski11
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    1. COAagh! Hurts... my... eyes... You are loading the image every time you render the board.
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      1. PODrawing and deleting jlabels from a jpanel
      1. USMartijn Courteaux
    2. COSimply add the labels to a 2D array, which would make it easier to access the label
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      1. USMadProgrammer
    3. COImage loading will be slow every time. A quick optimisation would be to use a Map<String, ImageIcon> (string would be the "path") to act as a cache and avoid loading things you've already loaded before. There are other ways (a ChessPiece enum or class that stores its ImageIcon along with it, etc.) but that's a whole different kettle of fish.
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      1. PODrawing and deleting jlabels from a jpanel
      1. USMr Spoon
 

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