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Thread: Scheduler Issue

  1. #1
    Junior Member
    Join Date
    Jul 2012
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    Default Scheduler Issue

    I do not know how to do what I am trying to do. I have an array of images that move across the screen. What I want to do is periodically increase this array and add a new element to it. The code from the 2 classes below shows how I attempted to do that. I was reserved doing it this way as I figured it wouldn't like multiple things trying to access the same array. When I ran the program it crashed when it tried to increase the array size, so my assumption was correct. My issue is, I am rusty on my Java and cannot think of a way to get around this.

    import java.util.*;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import javax.swing.*;
    import javax.imageio.*;
    import java.lang.Math;
    import java.io.*;
    import java.util.concurrent.*;
    import java.util.concurrent.TimeUnit.*;
     
    public class CellAttack extends JPanel
    {
     
    public static Rectangle screen, bounds;
    public static JFrame frame;
    public static ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
    public static RedBloodCell[] redCellArray = new RedBloodCell[40];
    public static interactiveParticle[] IPArray = new interactiveParticle[2];
    public static Random RG = new Random();
    public BufferedImage background = null;
    public static CellAttack panel;
     
      public CellAttack()
      {
        super();
        screen = new Rectangle(0, 0, 800, 600);
        bounds = new Rectangle(0, 0, 800, 600); 
        for(int i = 0; i < redCellArray.length; i++)
        {
            redCellArray[i] = new RedBloodCell(RG.nextInt(bounds.width+1),RG.nextInt(bounds.height-130)+50,(RG.nextInt(5)+1),bounds.width,bounds.height-130);
        }
        for(int m = 0; m < IPArray.length; m++)
        {
            IPArray[m] = new interactiveParticle(RG.nextInt(bounds.width+1),RG.nextInt(bounds.height-130)+50,(RG.nextInt(5)+1),bounds.width,bounds.height-130,RG.nextInt(3)+1,panel);
        }
        frame = new JFrame("Cell Attack");
        try
        {
            background = ImageIO.read(new File("background.png"));
        }
        catch(IOException e){}
      }
     
      public void paintComponent(Graphics g)
      {
        bounds = g.getClipBounds();
        g.clearRect(screen.x, screen.y, screen.width, screen.height);
        g.drawImage(background,0,0,this);
        for(int k = 0; k < redCellArray.length; k++)
        {
            g.drawImage(redCellArray[k].img, redCellArray[k].x, redCellArray[k].y, this);
        }
        for(int n = 0; n < IPArray.length; n++)
        {
            g.drawImage(IPArray[n].img, IPArray[n].x, IPArray[n].y, this);
        }
      }
     
      public void increaseIPArray()
      {
          interactiveParticle[] tempIPArray = new interactiveParticle[IPArray.length+1];
          for(int q = 0; q < IPArray.length; q++)
          {
              tempIPArray[q] = IPArray[q];
          }
          tempIPArray[IPArray.length] = new interactiveParticle(bounds.width,RG.nextInt(bounds.height-130)+50,(RG.nextInt(5)+1),bounds.width,bounds.height-130,RG.nextInt(3)+1,panel);
          IPArray = tempIPArray;
      }
     
      public static void main(String arg[])
      {
        panel = new CellAttack();
     
        Runnable mover = new Runnable()
        {
          public void run()
          {
            for(int j = 0; j < redCellArray.length; j++)
            {
              redCellArray[j].move();
            }
            for(int p = 0; p < IPArray.length; p++)
            {
              IPArray[p].move();
            }
            frame.repaint();
          }
        };
        scheduler.scheduleAtFixedRate(mover, 0, 20, TimeUnit.MILLISECONDS);
     
        panel.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        panel.frame.setSize(panel.screen.width, panel.screen.height+22);
     
        panel.frame.setContentPane(panel);
        panel.frame.setVisible(true);
      }
    }

    import java.util.*;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import javax.swing.*;
    import javax.imageio.*;
    import java.lang.Math;
    import java.io.*;
     
    public class interactiveParticle
    {
        public int x, y, width, height, Xstart, Yheight, redCellNum;
        int xVel;
        public Random RG = new Random();
        public BufferedImage img = null;
        public CellAttack CA;
     
        public interactiveParticle(int tempX, int tempY, int tempSpeed, int tempWidth, int tempHeight, int IP, CellAttack tempCA)
        {
            x = tempX;
            y = tempY;
            CA = tempCA;
            try
            {
                img = ImageIO.read(new File("virus"+String.valueOf(IP)+".png"));
            }
            catch(IOException e){}
            xVel = tempSpeed;
            Xstart = tempWidth;
            Yheight = tempHeight;
        }
     
        public void move()
        {
            x-=xVel;
     
            if(x < 0)
            {
                x = Xstart;
                y = RG.nextInt(Yheight)+50;
                xVel = RG.nextInt(4)+1;
                try
                {
                    img = ImageIO.read(new File("virus"+String.valueOf(RG.nextInt(3)+1)+".png"));
                }
                catch(IOException e){}
                CA.increaseIPArray();
            }
        }
    }
    Last edited by ercfrtz; July 6th, 2012 at 09:12 PM. Reason: rewording the question


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