Thread: Car racing

Norm, according what you have stated just now, all the images I put in the build folder of IDE..for what I know is that all the images all placed in the build folder of IDE then it can display all of the images..

Norm, I do have another program of 2D racing that I just did..How to program the number of laps and time remaining?
Here is the code :

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.geom.*;
import java.util.*;
 
class Car{
    Image img;
    int x, y;
    Dimension dim;
    Car(Image img){
    this.img = img;
  }
  Car(Image img, int x, int y){
    this.img = img; 
    this.x = x;
    this.y = y;
  }
  Car(Image img, int x, int y, Dimension dim){
    this(img, x, y);
    this.dim = dim;
  }
  void draw(Graphics g, ImageObserver observer){
    g.drawImage(img, x, y, observer);
  }
  int getX(){ return x;}
  int getY(){ return y;}
  void setX(int x){this.x = x;}
  void setY(int y){this.y = y;}
  void setLocation(int x, int y){
    this.x = x; this.y = y;
  }
  int getWidth(){
      return img.getWidth(null);
  }
  int getHeight(){
      return img.getHeight(null);
  }
  Rectangle2D getRectangle(){
    return new Rectangle2D.Float(x, y, getWidth(), getHeight());
  }
  void move(int dx, int dy){
    x += dx;
    y += dy;
    if(dim != null){
      if(x < 0)x = 0;
      if(x + getWidth() > dim.getWidth())
        x=(int)dim.getWidth() - getWidth();
    }
  }
  boolean intersects(Car car){
    return getRectangle().intersects(car.getRectangle());
  }
  boolean intersects(int x, int y){
    return getRectangle().intersects(x, y, getWidth(), getHeight());
  }
}
public class CarRace extends Applet implements KeyListener, Runnable{
        Image buff;
        Canvas screen;
        Graphics2D gs, gb;
        Car redCar;
        Car[] enemy = new Car[20];
        Button bStart;
        Button bFinish;
        Thread game;
        boolean loop = true;
        Dimension dim = new Dimension(200, 300);
        int road;
        Random rnd = new Random();
        public void init(){
            prepareResource();
            setBackground(Color.cyan);
            initScreen();
            add(screen);
            bStart = new Button("Start Game");
            add(bStart);
            bStart.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent ae){
                    screen.requestFocus();
                    if(!game.isAlive())
                        game.start();
                    }
                });
            bFinish = new Button("End Game");
            add(bFinish);
            bFinish.addActionListener(new ActionListener(){
                public void actionPerformed(ActionEvent ae){
                    screen.requestFocus();
                    if(!game.isAlive())
                        game.stop();
                    }
                });
  }
  void prepareResource(){
    Image imgRed = getImage(getCodeBase(),"Red Car.png");
    Image imgBlue = getImage(getCodeBase(),"Blue Car.png");
    Image imgGreen = getImage(getCodeBase(),"Green Car.png");
    MediaTracker mt = new MediaTracker(this);
    try{
      mt.addImage(imgRed, 0);
      mt.addImage(imgBlue, 1);
      mt.addImage(imgGreen, 2);
      mt.waitForAll();
    }catch(Exception ex){
    }
    buff = createImage((int)dim.getWidth(), (int)dim.getHeight());
    gb = (Graphics2D)buff.getGraphics();
    redCar = new Car(imgRed, 80,250, dim);
 
    for(int i = 0;i < 10;i++){
       enemy[i] = new Car(imgBlue, 0, 0);
    }
    for(int i = 10;i < enemy.length;i++){
       enemy[i]=new Car(imgGreen, 0, 0);
    }
    for(int i = 0;i < enemy.length;i++){
       setEnemy(i);
    }
    game = new Thread(this);
  }
  public void stop(){
    loop = false;
  }
  public void run(){
    while(loop){
       drawScreen();
       try{
           Thread.sleep(50);
       }catch(Exception e){
       }
    }
  }
  void initScreen(){
    screen = new Canvas(){
       public void paint(Graphics g){
         if(gs == null){
           gs = (Graphics2D)screen.getGraphics();
         }
         drawScreen();
       }
    };
    screen.setSize(dim);
    screen.addKeyListener(this);
  }
  void setEnemy(int en){
    int x, y;
next:while(true){
       x = rnd.nextInt((int)dim.getWidth() - enemy[en].getWidth());
       y =- rnd.nextInt(5000) - 200;
       for(int j = 0;j < enemy.length;j++){
         if(j != en && enemy[j].intersects(x, y))continue next;
       }
       enemy[en].setLocation(x, y);
       break;
    }
  }
  void check(Car en){
      if(redCar.intersects(en)){
         if(redCar.getX() > en.getX()){
           en.move(-20, 0);
           redCar.move(20, 0);
         }
         else{
           en.move(20,0);
           redCar.move(-20, 0);
         }
      }
  }
  synchronized void drawScreen(){
    gb.clearRect(0, 0, (int)dim.getWidth(), (int)dim.getHeight());
    gb.setPaint(new Color(100, 100, 100));
    gb.fillRect(0, 0, (int)dim.getWidth(), (int)dim.getHeight());
    drawRoad();
    for(int i = 0;i < enemy.length;i++){
       enemy[i].move(0, 15);
       enemy[i].draw(gb, screen);
       if(enemy[i].getY() > dim.getHeight())
         setEnemy(i);
       check(enemy[i]);
    }
    redCar.draw(gb, screen);
    gs.drawImage(buff, 0,0, screen);
  }
  void drawRoad(){
    road += 80;
    gb.setPaint(Color.yellow);
    gb.fillRect((int)dim.getWidth()/2, road,10,150);
    if(road >= dim.getHeight())road =- 150;
  }
  public void keyPressed(KeyEvent ke){
    if(ke.getKeyCode()==KeyEvent.VK_LEFT){
       redCar.move(-10,0);
    }
    else if(ke.getKeyCode()==KeyEvent.VK_RIGHT){
       redCar.move(10,0);
    }
  }
  public void keyReleased(KeyEvent ke){
  }
  public void keyTyped(KeyEvent ke){
  }
}

I have no idea what your IDE does. I don't have an IDE with a build folder. I have a folder where the .java file is located and where I execute the javac and java commands.
If you open a command prompt window, move to the folder with the .class files and the image files and issue the command: java RaceTrack
What happens?

Wait a sec..do you mean that you use a notepad to create the files including the compiler batch..??

Norm, mind to help me solve the problem for my 2nd car race program that I just only posted..??
Because I was planning to set the laps and time remaining and then stores the scores in the client/server..

No, I use a mini-IDE that has syntax coloring and commandline tools that I can set to issue any commandline I want.
The most used ones use javac and java. I have 4 different versions of javac and java that I can use: 1.4, 1.5, 1.6 and 1.7.

Originally Posted by DanielVkc

To dlorde : Can you help me to look into the code thoroughly to see what is the problem..??

Well I asked a question earlier to try to clarify what your problem is, and you didn't answer it, so I don't really think I know enough to be able to help.

I see.
Because I was instructed to use Netbeans IDE 6.9.1 for my project.
Can you help me take a look at the program that I have just posted just now?

Originally Posted by dlorde

Well I asked a question earlier to try to clarify what your problem is, and you didn't answer it, so I don't really think I know enough to be able to help.

The problem earlier is that all my images including the track and my cars can't be displayed..it just displayed the background color and the labels with textfields below it..

I see. So if I follow the comments that you stated how's my previous code going to be?
Mind to help me make some modification of my old code in post#1?

What are the modifications? Describe in detail what you want and how you think it can be done.

Originally Posted by Norm

One observation:
The image file extensions in the code are .gif
The images posted on the site were .png


You should start another thread with the new problem you posted in post#28. It will be too confusing to work on two programs in the same thread.

Ok.Just like you mentioned here..after the modification was made, the track and the cars will be displayed after hitting the "Start Game" button at below.
Then the 3 cars will be move at random speed along the track.
The number of rounds along the track is how many laps that you want the race to be displayed for example, 3 laps,4 laps, along with their time of completion of the race.
After the race is completed, their time are stored in a client/server to display their rankings through it.
This is the overview of my program.

This is the overview of my program.

Sounds like an ambitious project. How's it going?
Are you able to move the cars on the track?

The cars still can't run and they still can't display including the track.
Mind to help me..??
I really need help to complete my program.
Because I'm not really good in doing further programming techniques..
Furthermore, my project need to handed in by this week..

The cars still can't run and they still can't display including the track.

Are the image files being loaded? Do any of them display?
Are the files correctly named and in the correct location?
You are the only one that can check that. I can't see where any thing is on your computer.

Yup..my track was in gif format..
And all of my cars are in png format..

they still can't display including the track.

So this is NOT a problem now. Do All of the images display ok?

Originally Posted by Norm

So this is NOT a problem now. Do All of the images display ok?

Nope..they still can't be display..

Originally Posted by KevinWorkman

If you want help, you'll have to provide an SSCCE that demonstrates the problem, and you're going to want to answer the questions you've already been asked.

How does it works..??
Because I'm still a newbie and beginner around here..

Do you file names in the program match the file names of the images?

Originally Posted by Norm

Do you file names in the program match the file names of the images?

Yup..exactly the same..

To show me, Copy the few lines of code from your program that load the images and that show the file names and paste them here
Open a command prompt window, change to the folder with the images and enter the command: dir
Copy and paste the contents here:
To copy the contents of the command prompt window:
Click on Icon in upper left corner
Select Edit
Select 'Select All' - The selection will show
Click in upper left again
Select Edit and click 'Copy'

Paste here.