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Thread: Possible misuse of timer?

  1. #1
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    Default Possible misuse of timer?

    I am a bit inexperienced when it comes to using timers, especially in graphical programs.
    I am trying to code a simple Tunnel game where the player is moving through a randomly generated tunnel and has to move left and right to avoid touching the walls.
    Here is my code:
    import java.awt.*;
    import java.awt.event.*;
     
    import javax.swing.*;
     
    public class Tunnel extends JFrame{
     
    	public static final  boolean empty = true;
    	public static final boolean full = false;
     
    	public static boolean [][] board = new boolean[400][400];
     
    	public Tunnel(){ 
     
     
    		add(new DrawTunnel());
     
    		setTitle("Tunnel");
    		setLocation(300,100);
    		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		getContentPane().setSize(410,425);
    		setSize(417,440);
     
     
     
     
     
    		}
     
    	public static void main (String[] args){
    		Tunnel frame = new Tunnel();
    		frame.setVisible(true);
    	}
     
    	static class DrawTunnel extends JPanel{
     
    		Timer timer;
    		int middle = 200;
    		int width = 100;
     
    		public DrawTunnel(){
     
    			//create timer
    			timer = new Timer (5, new TimerListener());
    			timer.start();
     
    			emptyBoard();
     
    		}
     
    		public void paintComponent(Graphics g){
     
    			super.paintComponent(g);
     
    			g.setColor(Color.black);
    			for (int row= 0; row<board.length; row++){
    				for (int col=0; col<board[row].length; col++){
    					if (!board[row][col])
    						drawSquare(g, row,col);
    				}
    			}
    		}
     
    		public void drawSquare(Graphics g, int x, int y){
    			g.drawRect(x, y, 1, 1);
    		}
     
    		public void emptyBoard(){
    			for (int r=0; r<board.length; r++){
    				for (int c=0; c<board[r].length; c++){
    					board[r][c] = true;
    				}
    			}
    		}
     
    		class TimerListener implements ActionListener{
     
    			public void actionPerformed(ActionEvent e){
     
     
    				for (int r = board.length-2;r>=0;r--){
    					setRow(r,r+1);
    				}
     
    				drawTopLine(middle, width, 0);
     
    				repaint();
    				validate();
     
     
     
    			}
     
    			public void setRow(int rowOverwritten, int rowBeingCopied){
    				for (int c=0; c<board[rowBeingCopied].length; c++){
    					board[rowOverwritten][c] = board[rowBeingCopied][c];
    				}
    			}
     
    			public void setRow(boolean[][] board, int rowNum, boolean [] row){
    				for (int c=0; c<board[rowNum].length; c++){
    					board[rowNum][c] = row[rowNum];
    				}
    			}
     
    			public void drawTopLine(int gapMiddle, int gapWidth, int row){
     
    				for (int c=0; c<board[row].length; c++){
    					board[c][row] = false;
    				}
    				//forming gap
    				for (int c = gapMiddle - (gapWidth/2); c<gapMiddle + (gapWidth/2); c++){
    					board[c][row] = true;
    				}
    			}
    		}
    	}
    }

    When I run the program, only 1 row of pixelated "tunnel" appears at the top of the screen. Since I am not quite familiar with the Timer class and uses it for repetition, I guessed that I was misusing the timer. Where do I put the code to move all "tunnel walls" down and generate a new random one at the top?


  2. #2
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    Default Re: Possible misuse of timer?

    Why don't beginners comment their code? What are all of these classes and methods supposed to do? Are we supposed to read your mind?

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