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POAfter the button is clicked for the first time, the button stops working
 

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  1. POAfter the button is clicked for the first time, the button stops working
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    <p>I am developing a program where if the menu item "show grid line" is clicked, the drawing area below the menu bar will draw grid lines on the grid. </p> <p>EDIT: Below are the components to the program. I turned any parts that are not important for this issue into comments.</p> <pre><code>import java.awt.Color; import java.awt.Image; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; //main initializer public class lineFollower { frameDesign frame; //private static Image icon = new ImageIcon("images/icon copy.jpg").getImage(); public static void main(String[] args) { //make new frame JFrame frame = new frameDesign(); frame.setSize(1000,700); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); frame.setLocale(null); frame.setTitle("Line Follower Program 1.0"); //frame.setIconImage(icon); } } </code></pre> <p>This is the frame design (omitting parts as well):</p> <pre><code>import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.util.ArrayList; import javax.swing.*; public class frameDesign extends JFrame { //data fields //JPanel DataPanel; //ListPanel ListPanel; DrawingPanel DrawingPanel; grid gridbox; menuPanel menu; //ArrayList&lt;Rectangle&gt; Rectangles; //ArrayList&lt;Circle&gt; Circles; //ArrayList&lt;Triangle&gt; Triangles; public int newvalue = 0; public int[] griddim; public int gridwidth, gridheight; BorderLayout layout; //combine data into frame public frameDesign(){ //Rectangles = new ArrayList&lt;Rectangle&gt;(); //Circles = new ArrayList&lt;Circle&gt;(); //Triangles = new ArrayList&lt;Triangle&gt;(); //Layout: Border BorderLayout layout = new BorderLayout(); setLayout(layout); //Assemble the Menu menu = new menuPanel(); //Assemble the List Panel which also includes the animation buttons //ListPanel = new ListPanel(); //Create the gridbox gridbox = new grid(); gridbox.setPreferredSize(new Dimension(200,200)); gridbox.setSize(500,200); griddim = gridbox.getgriddim(); gridwidth = griddim[0]; gridheight = griddim[1]; //Data Panel consists of ListPanel, AnimatePanel, and DrawingPanel //DataPanel = new JPanel(new FlowLayout()); //DataPanel.add(DrawingPanel= new DrawingPanel()); //DataPanel.add(ListPanel = new ListPanel()); //DataPanel.setSize(250,700); //DataPanel.setBackground(Color.getHSBColor(150f, 100f, 100f)); //DataPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK, 5)); add(gridbox, BorderLayout.CENTER); add(menu, BorderLayout.NORTH); //add(DataPanel, BorderLayout.EAST); //getPoints pointfinder = new getPoints(); //pointgrabber pointfinder2 = new pointgrabber(); //gridbox.addMouseListener(pointfinder2); //gridbox.addMouseMotionListener(pointfinder); //ActionListeners for Menus menu.ShowLine.addActionListener(new ActionListener(){ @Override public void actionPerformed(ActionEvent e){ //show the grid if (gridbox.isgridline()==true){ gridbox.gridline(false); } else if (gridbox.isgridline()==false){ gridbox.gridline(true); } } }); } </code></pre> <p>The next pile of code is for the grid creation:</p> <pre><code>import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import javax.swing.BorderFactory; import javax.swing.JOptionPane; import javax.swing.JPanel; /* * This is the design for the grid */ public class grid extends JPanel { //data fields boolean isgridline; private static int startX = 50; private static int startY = 50; private int intervalline; private int[] griddim; //gridPanel grid(){ setBorder(BorderFactory.createLineBorder(Color.BLACK)); griddim = new int[2]; griddim[0] = 500; griddim[1] = 500; isgridline = false; intervalline = 20; } //Paints grid @Override protected void paintComponent(Graphics g){ super.paintComponent(g); //GridBox g.setColor(Color.BLACK); g.drawRect(50, 50, griddim[0], griddim[1]); g.setColor(Color.WHITE); g.fillRect(50, 50, griddim[0], griddim[1]); //draw grid lines if (isgridline){ g.setColor(Color.getHSBColor(150, 150, 200)); //vertical lines for (int v = 0; v &lt;griddim[0]; v = v+intervalline){ g.drawLine(startX, 50, startX, 50+griddim[1]); startX = startX+intervalline; } //horizontal lines for (int v=0; v&lt;griddim[1]; v=v+intervalline){ g.drawLine(50, startY, 50+griddim[0], startY); startY = startY+intervalline; } } } //set grid dimensions public void setgridbox(int[] dim){ griddim=dim; } //get grid dimensions public int[] getgriddim(){ return griddim; } //set the grid line true or false public void gridline(boolean islines){ isgridline=islines; repaint(); } //get gridline true or false public boolean isgridline(){ return isgridline; } //set grid line intervals //public void setinterval(int interval){ //intervalline=interval; //repaint(); //} } </code></pre> <p>Lastly, the menu:</p> <pre><code>import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.EventListener; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; import javax.swing.event.MenuEvent; /* * Class just for the menu panel */ public class menuPanel extends JMenuBar { JMenuItem New, Save, Open, Exit; JMenu fileMenu, gridMenu; JMenuItem GridDim, GridLine, ShowLine; menuPanel(){ //Assemble file menu fileMenu = new JMenu("File"); New = new JMenuItem("New"); Save = new JMenuItem("Save"); Open = new JMenuItem("Open"); Exit = new JMenuItem("Exit"); fileMenu.add(New); fileMenu.add(Save); fileMenu.add(Open); fileMenu.addSeparator(); fileMenu.add(Exit); add(fileMenu); //Assemble grid menu gridMenu = new JMenu("Grid"); GridDim = new JMenuItem("Dimension"); GridLine = new JMenuItem("Change Grid Line Interval"); ShowLine = new JMenuItem("Show Grid Lines"); gridMenu.add(GridDim); gridMenu.add(GridLine); gridMenu.add(ShowLine); add(gridMenu); } } </code></pre> <p>When the "show grid lines" button in the menu bar under grid is clicked, it turns on the grid lines and turns off the grid lines once each. It stops working after that... What can I do such that the grid lines show up on and off again more than just once?</p>
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    1. PTQuestion
    1. USMisha Zaslavsky
    1. USuser1843841
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      1. POAfter the button is clicked for the first time, the button stops working
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      1. VTApproveEditSuggestion
    1. CODon't forget to call `gridbox.repaint()` after you change the state of gridline.
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      1. POAfter the button is clicked for the first time, the button stops working
      1. USHovercraft Full Of Eels
    2. COUse a flag (boolean variable) and after clicking the button make flag to true. Check whether flag is false before starting some task
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      1. POAfter the button is clicked for the first time, the button stops working
      1. USGrant
    3. CO`if (gridbox.isgridline()==true){` should be `if (gridbox.isgridline()){` & `else if (gridbox.isgridline()==false){` should be `else {`. In fact, that ***entire*** if/else could be `gridbox.gridline(!gridbox.isgridline());`
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      1. POAfter the button is clicked for the first time, the button stops working
      1. USAndrew Thompson
 

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