MacBook-Pro-gala/Java-project

Specification

Dependencies

java version"11.0.5"

jl1.0.1.jar

Model

There are many rocks and water lilies in a pond.And ducks born, live and die in the pool.The water lilies grow back randomly in the pond. When a duck borns, it moves in the pond and when it meets a water lily, it eats it and when it eats, the duck grows.If a duck does not eat after a certain time, it will lose weight and if it continues to lose weight it will eventually die.When a duck gets bigger and bigger it eventually becomes a head duck, in which case it changes color.A chief duck is the only one that whistles and the other ducks line up behind him in single file.

Classes, Interfaces, Packages

Classes

Duck Duck class defines duck's x-coordinate , y-coordinate , width , height , x-speed , y-speed

public class Duck implements GameConstants {       
private int x;      
private int y;       
private int wsize;       
private int hsize;       
private int xSpeed;       
private int ySpeed;
...

Defines ducks move and when they meet pond edge,they will change their direction

public void move(Duck duck){      
x+=xSpeed;       
y+=ySpeed;       
if(x>=GWIDTH-duck.getWsize()) {             
  xSpeed = -Math.abs(xSpeed);      
}      
else if(x<=0) {            
  xSpeed = Math.abs(xSpeed);      
}      
else if(y>=GHEIGHT-duck.getHsize()) {            
  ySpeed = -Math.abs(ySpeed);      
}       
else if(y<=0) {             
 ySpeed = Math.abs(ySpeed);      
}
}

Defines constructor

public Duck() {
  	this.x =   duckx.getRandom2(50,GWIDTH);
  	this.y = ducky.getRandom2(50,GHEIGHT);
  	this.xSpeed = speedRandom.getRandom(MIN_SPEED,MAX_SPEED);
  	this.ySpeed = speedRandom.getRandom(MIN_SPEED,MAX_SPEED);
  	this.wsize = 40;
  	this.hsize = 40;
  }

Lily

Defines related properties and constructor

public class Lily implements GameConstants  {
  private int x;
  private int y;
  private int w;
  private int h;
  ...

public Lily() {
 this.x = ballPostion.getRandom(50,GWIDTH-40);
 this.y = ballPostiony.getRandom(50,GHEIGHT-60);
 this.w = 30;
 this.h= 23;
}

Rock

Defines related properties and constructor

public class Rock {
    private int x;
    private int y;
    private int w;
    private int h;
    ...

public Rock() {
    this.x = ballPostion.getRandom(50, GameConstants.GWIDTH - 40);
    this.y = ballPostiony.getRandom(50, GameConstants.GHEIGHT - 60);
    this.w = 63;
    this.h = 50;
}

Interface

Defines some constants that need to be used

public interface Constants {
   int GWIDTH = 1000;
   int GHEIGHT = 600;
   String TITLE = "DuckPondModel";
   int DELAY = 10;
   int MAX_SPEED = 1;
   int MIN_SPEED = -1;
   int INI_DUCKS = 2;
   int MAX_DUCKS = 5;
   int MAX_LILIES = 5;
   int ROCK = 3;
}

Packages

jli.0.1.jar provides audio file support

Graphics

Write a utility class to find the path of the image you want and use ImageIO.read()to read it. Override paintComponent() and draw the background, duck, lily and stone on the panel.

@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(new ImageIcon("bg.jpg").getImage(),0,0, null);
drawDucks(g);
drawLilies(g);
drawRocks(g);
}

Draw a duck as an example

private void drawDucks(Graphics g) {
   for(Duck duck : ducks) {
      if (duck.getWsize() < 64 || duck.getHsize() < 64) {
         duck.drawDuck(g);
      }
      if (duck.getWsize() >= 64 || duck.getHsize() >= 64) {
         duck.drawDuck2(g);
         duck_chief.set(ducks.indexOf(duck),1);
      }
      duck.move();
      duck.changeDirection(duck);
   }
}

Image image = GameUtil.getImage("duck.png");
Image image2 = GameUtil.getImage("chiefduck.png");

public void drawDuck(Graphics g) {
   g.drawImage(image, x, y, wsize,hsize,null);
}
public void drawDuck2(Graphics g) {
   g.drawImage(image2, x, y, wsize,hsize,null);
}

Draw the start interface background

class MyPanel extends JPanel{
    public void paint(Graphics g){
        super.paint(g);
        g.drawImage(new ImageIcon("bg.jpg").getImage(),0,0, null);
        g.drawImage(new ImageIcon("bg1.png").getImage(),220,100, null);
    }
}

Animation

Override actionPerformed() method.

In MainFrame.java ，set the button event listener,when play button is pressed,the listener responds to the event,go to the new panel.

jb = new JButton("play");
...
jb.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
  //Go to the new panel
  mp.setVisible(false);
  jb.setVisible(false);
  t.stop();
  Board board = new Board();
  add(board);
}
});

Use Timer Class to trigger the ActionEvent event at a predetermined frequency to achieve dynamic effect.

delay: Sets the time interval between the two events

actionListener： the listener that triggers the event of the Timer class

timer = new Timer(DELAY,this);
timer.start();

Override actionPerformed() method to repaint the panel.

@Override
public void actionPerformed(ActionEvent e) {+
for(int i=0;i<ducks.size();i++){
if(duck_colision.get(i)==0)
   Collision();
}
Eat();
RockCollision();
}

duck move: speed is random

public void move(Duck duck) {
x+=xSpeed;
y+=ySpeed;
...

Ducks and lilies use threads to generate continuously , but ducks have the largest number, If the number of ducks is less than the maximum, a new one is born.

Eat lilis

Whether to eat lilies was determined by examining whether ducks and lilies overlapped.Use ArrayList to remove the lily was ate and use an arraylist to mark it.

private void Eat(){
  for(int i = 0; i< ducks.size(); i++) {
		for(int j = 0; j< lilies.size(); j++) {
   			if(checkEat(ducks.get(i), lilies.get(j))) {
//				System.out.println(" "+ducks.get(i).getX()+ " "+ ducks.get(i).getY()+" "+lilies.get(j).getX()+ " "+ lilies.get(j).getY());
    				lilies.remove(j);
    				duck_lily.set(i,duck_lily.get(i)+1);
//				duck_data[i].set(0,1);
    				duck_sign.set(i,1);
   			}
		}
  }
}
private boolean checkEat(Duck firstDuck, Lily firstLily) {
  int xDistance2 = firstDuck.getX() - firstLily.getX();
  int yDistance2 = firstDuck.getY() - firstLily.getY();
  boolean sign1=false;
  if(firstDuck.getWsize()> firstLily.getW()&&firstDuck.getHsize()> firstLily.getH())
		sign1= (xDistance2 >= -firstDuck.getWsize() && xDistance2 <= firstLily.getW())
   			&& (yDistance2 >= -firstLily.getH() && yDistance2 <= firstDuck.getHsize());
  else if(firstDuck.getWsize()< firstLily.getW()&&firstDuck.getHsize()> firstLily.getH())
		sign1= (xDistance2 >= -firstDuck.getWsize()&& xDistance2 <= firstLily.getW())
    				&& (yDistance2 >= -firstLily.getH() && yDistance2 <= firstDuck.getHsize());
  else if(firstDuck.getWsize()< firstLily.getW()&&firstDuck.getHsize()< firstLily.getH())
		sign1= (xDistance2 >=-firstDuck.getWsize()  && xDistance2 <= firstLily.getW())
    				&& (yDistance2 >= -firstLily.getH() && yDistance2 <= firstDuck.getHsize());
  return sign1;
}

Collision

Similar to ducks eating lilies, ducks change speed when they collide with each other or with rocks

Grow and lose weight

Judge by the mark,duck become bigger or smaller.Ducks will disappear when they become smaller and smaller, and become ducks when they become bigger and bigger. The size of ducks is used as a judgment condition

for(int i = 0;i<ducks.size();i++){
               if(duck_sign.get(i)==1&&(ducks.get(i).getWsize()<=72||ducks.get(i).getHsize()<=72)){
                       ducks.get(i).setWsize(ducks.get(i).getWsize()+8);
                       ducks.get(i).setHsize(ducks.get(i).getHsize()+8);
                       duck_sign.set(i, 0);
                    }
               if(ducks.get(i).getWsize()<=8||ducks.get(i).getHsize()<=8){
                       ducks.remove(i);
                       duck_lily.remove(i);
                       duck_sign.remove(i);
                       duck_chief.remove(i);
                  duck_colision.remove(i);
                  duck_member.remove(i);

                    }
                    }
    ```
    
##### Chief duck
    
    When the duck becomes the chief duck, it is marked. Through the mark, the whistle thread is triggered, and all the other ducks will follow the chief duck, keeping the speed direction of each duck pointing to the position of the previous duck.

```java
if (duck.getWsize() >= 64 || duck.getHsize() >= 64) {
   duck.drawDuck2(g);
   duck_chief.set(ducks.indexOf(duck),1);
   sign=true;
//       duck_data[ducks.indexOf(duck)].set(1,1);
}
    ```
    
    ```java
Thread t_4= new Thread(){
    public void run() {
while (!result) {
   if (duck_chief.contains(1)) {
      int a = duck_chief.indexOf(1);
      for(int i = 0; i < duck_chief.size(); i++){
            duck_member.set(i, i);
              duck_colision.set(i, 1);
           }
           duck_member.set(0, a);
           duck_member.set(a, 0);
           for (int i = 1; i < duck_member.size(); i++) {
              ducks.get(duck_member.get(i)).setxSpeed((ducks.get(duck_member.get(i-1)).getX() - ducks.get(duck_member.get(i)).getX())/ducks.get(a).getWsize());
              ducks.get(duck_member.get(i)).setySpeed((ducks.get(duck_member.get(i-1)).getY() - ducks.get(duck_member.get(i)).getY())/ducks.get(a).getWsize());
    
           }
        }
     }
    }
};
    t_4.start();
    ```
    
  ![image4](https://github.com/lyufan/Java-project/blob/master/image/image4.png)

Thread

LoginMusic() : Start UI background music

t_duck : Born ducks

t_lily :Born lilies

t_1 : Ducks grow and dead

t_2 : Ducks lose weight

t_3 : Chief ducks whistle

t_4 : Chief queue

Bonus

Start panel

background music

timer

MacBook-Pro-gala / Java-project