[英]How to use multiple thread for multiple circle animation?
我已經繪制了多個圓圈,並且希望它們使用不同的線程同時向右移動。 所以我必須使用多個線程。 但是,當我運行該程序時,它會一次又一次地重新繪制圓圈。 我實際上知道問題出在哪里,但我不知道如何解決。 這是我的代碼:
Circles.java:
import java.awt.Color;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JPanel;
public class Circles extends JPanel {
private int x,y,r,s;
private Color c;
private Random ran;
public Circles() {
// TODO Auto-generated constructor stub
ran = new Random();
x = ran.nextInt(600)+5;
y = ran.nextInt(600)+5;
r = ran.nextInt(100)+20;
s = ran.nextInt(10)+5;
c = new Color(ran.nextInt(255),ran.nextInt(255),ran.nextInt(255));
}
public int getX() {
return x;
}
public int getY() {
return y;
}
public int getR() {
return r;
}
public Color getC() {
return c;
}
public int getS() {
return s;
}
public void move(int speed) {
x = x+speed;
}
}
Game.java:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JFrame;
public class Game extends JFrame implements Runnable {
private static Circles myCircle;
private static int numberOfCircle;
private Random ran;
private static ArrayList<Circles> circleList = new ArrayList<>();
public Game() {
// TODO Auto-generated constructor stub
setLayout(new BorderLayout());
setVisible(true);
setSize(700,700);
setTitle("Game");
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Thread t = new Thread(this);
t.start();
System.out.println(t.getName());
}
@Override
public void paint(Graphics g) {
// TODO Auto-generated method stub
super.paint(g);
for(int i=0; i<numberOfCircle; i++) {
myCircle = new Circles();
g.setColor(myCircle.getC());
g.fillOval(myCircle.getX(), myCircle.getY(), myCircle.getR(), myCircle.getR());
circleList.add(myCircle);
}
}
public static void main(String[] args) {
Game game = new Game();
numberOfCircle = Integer.parseInt(args[0]);
}
@Override
public void run() {
// TODO Auto-generated method stub
while(true) {
try {
Thread.currentThread().sleep(100);
for(int i=0; i<numberOfCircle; i++) {
myCircle.move(circleList.get(i).getS());
}
repaint();
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
}
}
}
有什么建議嗎?
每次您調用paint時,您都會在paint方法內一次又一次地創建新的圓,在paint之外對某個init方法進行初始化,
@Override
public void paint(Graphics g) {
super.paint(g);
for (Circles myCircle:circleList
) {
g.setColor(myCircle.getC());
g.fillOval(myCircle.getX(), myCircle.getY(), myCircle.getR(), myCircle.getR());
}
}
public static void main(String[] args) {
Game game = new Game();
numberOfCircle = 5;
for(int i=0; i<numberOfCircle; i++) {
myCircle = new Circles();
circleList.add(myCircle);
}
}
@Override
public void run() {
while(true) {
try {
Thread.currentThread().sleep(100);
for (Circles myCircle:circleList
) {
myCircle.move(myCircle.getS());
}
repaint();
} catch (Exception e) {
// TODO: handle exception
System.out.println(e.getMessage());
}
}
}
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