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Thread: Problem in rotating and moving image at the same time

  1. #1
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    Default Problem in rotating and moving image at the same time

    hello every one hope fine
    im making a car game in which you have an upper view of car
    problem is that i cant make the car rotate and move at the same time
    mean if i press up and right arrow key at the same time it just rotate or move forward
    can any one know how to do both things at the same time
    and also the car speed is very fast how can i make it moderate??
    here is the code
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import java.awt.geom.*;
    import java.applet.*;
    import java.net.URL;
     
    public class RaceGame extends JComponent
    {
     
    static int x=560;
    static int  y=410;
     
    static int currentAngle=0;
    static double hspeed,vspeed;
    static int carspeed=0;
     
    double hangle,vangle;
     
    Image car;
    Image finish;
     
     
    Image getImage(String filename)
    {    	
    URL url = getClass().getResource(filename); 
     
    ImageIcon  icon = new ImageIcon(url);    
    return icon.getImage();
    }
     
     
    public RaceGame()
    {
    car=getImage("car1.jpeg");
    //finish=getImage("finish.jpg");
     
     
    }
     
     
     
    public void CreateBase()
    {
    JFrame frame=new JFrame("Dare2Race");
    frame.setBounds(70,30,650,500);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
     
    Container c=frame.getContentPane();
    c.add(new RaceGame());
     
    frame.addKeyListener(new adapter());
    c.setBackground(Color.BLACK);
     
     
    }
     
     
    public void rotate()
    {
    currentAngle+=1;
     
    if(currentAngle>=360)
    {
    currentAngle=0;
    }
    repaint();
    }
     
     
    public void paint(Graphics g)
    {
    super.paint(g);
     
    Graphics2D g2d=(Graphics2D)g;
     
    AffineTransform origXform=g2d.getTransform();
    AffineTransform newXform=(AffineTransform)(origXform.clone());
     
    newXform.rotate(Math.toRadians(currentAngle),x,y);
     
    g2d.setTransform(newXform);
     
    //g2d.drawImage(finish,12,10,this);
    g2d.drawImage(car,x,y,this);
     
    g2d.setTransform(origXform);
     
    g.setColor(Color.WHITE);
    g.drawLine(640,380,420,380);
    g.drawLine(640,460,320,460);
    g.drawLine(420,380,420,300);
    g.drawLine(320,460,320,380);
    g.drawLine(420,300,125,300);
    g.drawLine(320,380,230,380);
    g.drawLine(230,380,230,460);
    g.drawLine(230,460,2,460);
    g.drawLine(125,300,125,370);
    g.drawLine(125,370,105,370);
    g.drawLine(2,460,2,180);
    g.drawLine(105,370,105,300);
    g.drawLine(2,180,450,180);
    g.drawLine(105,300,105,250);
    g.drawLine(105,250,550,250);
    g.drawLine(550,250,550,20);
    g.drawLine(550,20,275,20);
    g.drawLine(450,180,450,100);
    g.drawLine(450,100,360,100);
    g.drawLine(360,100,360,160);
    g.drawLine(360,160,10,160);
    g.drawLine(10,160,10,30);
    g.drawLine(275,20,275,90);
    g.drawLine(275,90,110,90);
    g.drawLine(110,90,110,30);
    repaint();
    }
     
     
     
     
    class adapter extends KeyAdapter
    {
     
     
    public void keyPressed(KeyEvent e)
    {
     
      switch(e.getKeyCode())
      {
        case KeyEvent.VK_LEFT:
     
     
        currentAngle--;
        repaint();
        break;
     
        case KeyEvent.VK_RIGHT:
     
     
        currentAngle++;
        repaint();
        break;
     
        case KeyEvent.VK_UP:
     
        carspeed++;
     
        hangle=Math.toRadians(currentAngle);
        vangle=Math.toRadians(currentAngle);
     
        hspeed=((double)carspeed)*Math.cos(hangle);
        vspeed=((double)carspeed)*Math.sin(vangle);
     
        x = x - (int) hspeed;
        y = y - (int) vspeed;
     
        repaint();
        break;
     
        case KeyEvent.VK_DOWN:
     
        carspeed--;
     
        hangle=Math.toRadians(currentAngle);
        vangle=Math.toRadians(currentAngle);
     
        hspeed=((double)carspeed)*Math.cos(hangle);
        vspeed=((double)carspeed)*Math.sin(vangle);
     
        x = x + (int)hspeed;
        y = y + (int)vspeed;
        repaint();
        break;
      }
     
     
     
    }
     
     
    } 
     
     
     
     
    public static void main(String[]args)
    {
     
    RaceGame race=new RaceGame();
    race.CreateBase();
    //race.setDoubleBuffered(true);
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problem in rotating and moving image at the same time

    One suggestion so far: do the setVisible() call after everything is ready to be shown.

  3. #3
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    Default Re: Problem in rotating and moving image at the same time

    The problem is that both keys aren't registering in a text field or notepad or something hold down 1 for a while then hold down 2(don't release 1) what happens? I think this is the same problem here you could try something with threads too be honest I'm not sure how you would get that to work so do a bit of searching .

    Although one idea does spring to mind say if you had a few booleans say one for each direction and when a key stroke for that direction is detected (pressed) set the boolean as true and when it's released set it to false. And rather then have the commands carry out in the keys themselves have a method that does the work based on what booleans are true and is invoked with each keyPressed.

    As for the carSpeed being too fast instead of carSpeed++ change it to a double and say something like carSpeed += .2

  4. #4
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    Default Re: Problem in rotating and moving image at the same time

    You'll most likely need to store which buttons are pressed and deal with the combinations as they present themselves. You can keep an array which corresponds to each key, set their values upon keyPressed and unset upon keyReleased events.
    Pseudo-code
    boolean[] val = new boolean[4];//0 = left, 1 = up, 2 = right, 3 = down
    //initialize the above to false upon construction
     
    ....
    public void keyPressed(KeyEvent e){
     
    case VK_LEFT:
     
         val[0] = true;
        if ( val[1] ){//up is pressed as well
           ///VK_LEFT and VK_UP
        }else if ( val[3] ){//down is pressed as well
           //VK_LEFT and VK_DOWN
        }else{
            //only VK_LEFT
        }
    }
    public void keyReleased(KeyEvent e){
    //reset the value for the appropriate key
    case VK_LEFT:
       val[0] = false;
    ///...and so on
    }

    If you need to deal with button holds, you need to go into either a while loop or spawn a new Timer to deal with the continued event

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: Problem in rotating and moving image at the same time

    On Windows: Look at how the keyboard responses are set in the Control panel. It will effect how fast you get events.

    Add some println() statements to all the listener methods to display when they are called and with what key. You can see how/when the system sends events to the listeners.

  6. #6
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    Default Re: Problem in rotating and moving image at the same time

    Thanks every one for help bt i dont know how to use timer
    and if i use while it goes into infinite loop
    any other help any one

  7. #7
    Super Moderator Norm's Avatar
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    Default Re: Problem in rotating and moving image at the same time

    What did you see when you added the print statements to the listener? Did the printed output occur in realtime with your key presses or were there delays, batching and some missed presses?

  8. #8
    Super Moderator copeg's Avatar
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    Default Re: Problem in rotating and moving image at the same time

    Quote Originally Posted by SlimShady View Post
    Thanks every one for help bt i dont know how to use timer
    and if i use while it goes into infinite loop
    any other help any one
    How to Use Swing Timers (The Java Tutorials > Creating a GUI With JFC/Swing > Using Other Swing Features)

    Working off the code I posted above, and using the array which specifies if a key is held, you can do something like the following (in semi-pseudo-code: you'd need to implement for each direction).
    private Timer leftHold = null;
    private class LeftTimerListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
            //increment your rotation value
            //repaint your JPanel
           if ( !val[0] ){
                leftHold.stop();
           }
        }
    }
    ....
    //in the key listener
    case VK_LEFT:
         val[0] = true;
         leftHold = new Timer(60, new LeftTimerListener());//fires every 60ms
         leftHold.start();

    I will note that keyTyped events are fired when the key is held, however the method above makes the timing much easier to control which may be necessary in your case (for example, on the systems I know the second keyTyped event is fired only after a long delay)

  9. #9
    Super Moderator Norm's Avatar
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    Default Re: Problem in rotating and moving image at the same time

    the second keyTyped event is fired only after a long delay)
    On WinXP the delay can be set in the Control panel

  10. #10
    Super Moderator copeg's Avatar
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    Default Re: Problem in rotating and moving image at the same time

    Quote Originally Posted by Norm View Post
    On WinXP the delay can be set in the Control panel
    Perhaps, but in my view this defeats the purpose of write once run anywhere since other systems may not have that option (you would also have to ask the user to change it or potentially effect the performance of other applications by having the app change it directly). If the timing is hardcoded in, this isn't even an issue. Just my .02

  11. #11
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    Default Re: Problem in rotating and moving image at the same time

    Right.
    The OP is getting real-time responses to key presses. I don't know if that is possible because of these OS things.

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