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POHow can I make the DocumentListener compare after every line and not only once the program is run?
 

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  1. POHow can I make the DocumentListener compare after every line and not only once the program is run?
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    <p>I started doing the assignment number #3 by just adding a basic code to understand how it works. But I can’t get out of this problem. I just added an “if” so that if the input text is equal to “hr”, then the turtle would move 2 squares to the right every time. But when I run the code, it is as if it only checks the first characters. If the first two characters are “hr” then it marks a point, but if not, it never again checks the input. So for example if I write:</p> <pre><code>re Fd hr </code></pre> <p>It never marks the point even though “hr” is there. What can I do so that the TurtleRenderer reads the line every time a \n is inserted and not only once the code is run?</p> <p>My code:</p> <pre><code>package turtle; public class BoardMaker { private static int MAX = 100; private boolean[][] board = new boolean[MAX][MAX]; int previousX = 0; int previousY = 0; public boolean[][] makeBoardFrom(String description) { if(description.contentEquals("hr")){ previousX+=2; board[previousX][previousY]=true; } return board; } public boolean[][] initialBoard() { for(int i=0;i&lt;MAX;i++) { for(int j=0;j&lt;MAX;j++) board[i][j]=false; } return board; } } </code></pre> <p>The TurtleRenderer class:</p> <pre><code>package turtle; public class TurtleRenderer extends Panel implements DocumentListener { private static final long serialVersionUID = 1; static final Dimension WINDOW_SIZE = new Dimension(1150, 1150); boolean [][] board; final BoardMaker boardMaker; public TurtleRenderer() { boardMaker = new BoardMaker(); board = boardMaker.initialBoard(); } static public void main(String args[]) throws Exception { JFrame frame = new JFrame("Display image"); JPanel panel = new JPanel(); TurtleRenderer image = new TurtleRenderer(); image.setPreferredSize(WINDOW_SIZE); JScrollPane textArea = makeTextArea(image); panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS)); panel.add(image); buildRightPanel(panel, textArea); frame.setSize(WINDOW_SIZE); frame.addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent we){ System.exit(0); }}); frame.getContentPane().add(panel); frame.setVisible(true); } static void buildRightPanel(JPanel panel,JComponent textArea) { JLabel label = new JLabel("Your program:"); label.setPreferredSize(new Dimension(150, 20)); JPanel right = new JPanel(); textArea.setPreferredSize(new Dimension(150,500)); right.setLayout(new BoxLayout(right, BoxLayout.Y_AXIS)); right.add(label); right.add(textArea); panel.add(right); } public void paint(Graphics g) { Graphics2D g2d = (Graphics2D)g; g2d.setColor(Color.white); g.fillRect(0, 0, WINDOW_SIZE.width, WINDOW_SIZE.width); if(board == null) return; g2d.setColor(Color.red); for(int i=0;i&lt;board.length;i++) { for(int j=0;j&lt;board.length;j++) { if(board[i][j]) g2d.fillRect(9*i+1, 9*j+1, 6, 6); } } } static JScrollPane makeTextArea(TurtleRenderer image) { JTextArea textArea = new JTextArea(); textArea.getDocument().addDocumentListener(image); textArea.setVisible(true); JScrollPane areaScrollPane = new JScrollPane(textArea); areaScrollPane.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); areaScrollPane.setBorder(BorderFactory.createLineBorder(Color.black)); return areaScrollPane; } @Override public void insertUpdate(DocumentEvent e) { changed(e); } @Override public void removeUpdate(DocumentEvent e) { changed(e); } @Override public void changedUpdate(DocumentEvent e) { changed(e); } void changed(DocumentEvent de) { String description; Document document = de.getDocument(); try { description = document.getText(0, document.getLength()); } catch (BadLocationException e) { throw new RuntimeException(e); } try { board = boardMaker.makeBoardFrom(description); } catch(ParserException pe) { board = null; } this.repaint(); } } </code></pre>
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    1. USHovercraft Full Of Eels
    1. USuser2152167
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      1. POHow can I make the DocumentListener compare after every line and not only once the program is run?
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    1. COCan you clarify the text of your question above. Perhaps it's just me, but your explanation of your problem is *very* confusing to me.
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      1. POHow can I make the DocumentListener compare after every line and not only once the program is run?
      1. USHovercraft Full Of Eels
    2. CONext: why are you mixing AWT components (such as `Panel`) with Swing components (such as pretty much everything else)? Why not just use Swing components?
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      1. POHow can I make the DocumentListener compare after every line and not only once the program is run?
      1. USHovercraft Full Of Eels
    3. COI think there are problems in parsing the string.
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      1. USExtreme Coders
 

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