java限制和冻结按钮不起作用,也不会生成新球(动画)
这是一个UI,可以使球以对角线的方式向下移动,但每次我按下按钮“设置它的动画!”它不会创建新球
另一个问题是“冻结”按钮不能像预期的那样工作,因为它应该停止球,然后;如果你再按一次,球就会再次移动
最后,极限出了问题,因为当球几乎触到底部时,它没有到达底部并反弹到右侧。而且,当球“触到”正确的极限时,它就会上升
此外,调整帧大小时,限制不会更新
请下载一个球并更改目录,以便程序可以找到球的分配位置。没有必要下载足球场,但如果你愿意,也可以。最后,我要感谢您花时间查找此故障
Ball link: https://lapequeteria.cl/wp-content/uploads/2018/11/balon-adidas-2.jpeg (Make it png)
Pitch link: https://www.freejpg.com.ar/asset/900/9c/9ca2/F100004898.jpg
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.util.ArrayList;
import javax.imageio.ImageIO;
import java.io.File;
class Animation extends JFrame { //Frame
static boolean running = true;
static Layout panel = new Layout();
JButton animate, stop;
Runnable runnable;
Thread move;
public Animation() {
setLayout(new BorderLayout()); //BorderLayout disposition
setTitle("Pelota en acción");
animate = new JButton("Animate it!"); //Button to create balls
animate.setSize(120,30);
animate.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
panel.createEllipse();
runnable = panel;
move = new Thread(runnable);
panel.X = 0;
panel.Y = 0;
move.start();
}
});
stop = new JButton("Freeze"); //Botón para interrumpir hilo (aun no implementado)
stop.setBounds(0,0,120,30);
stop.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
if(move.isAlive()){
stop.setText("Go"); //Pause
synchronized(move) {
try {
// running = false;
move.wait();
} catch (InterruptedException ex) {
System.out.println("Interrupted");
}
}
}
else {
stop.setText("Freeze"); //Play
synchronized(move) {
// running = true;
move.notifyAll();
}
}
}
});
JPanel subPanel = new JPanel(); //Layout with its buttons situated to the south
subPanel.add(animate);
subPanel.add(stop);
add(subPanel,BorderLayout.SOUTH);
add(panel);
}
public static void main(String[] args) { //Frame construction
Animation ventana = new Animation();
ventana.setSize(850,625);
ventana.setLocationRelativeTo(null);
ventana.setVisible(true);
ventana.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
}
class Layout extends JPanel implements Runnable { //Layout and thread
volatile double X,Y; //Coordinates
volatile double dX=1,dY=1; //Direction
static ArrayList<Image> balls = new ArrayList<>(); //Balls collection
Image picture, ball;
int width = 120,height = 120;
@Override
public void paintComponent(Graphics g) { //Shows the ball and the pitch
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
soccerPitch();
g2.drawImage(picture, 0, 0, null);
for (Image ball : balls) { //Balls added to the layout
g2.drawImage(ball,(int)X,(int)Y,100,100,null);
}
}
public void soccerPitch () { //Builds the soccerPitch image
try {
picture = ImageIO.read(new File("C:\\Users\\Home\\Desktop\\NO BORRAR porfavor\\Cancha.jpg"));
} catch (IOException ex) {
System.out.println("Pitch image was not found");
}
}
public void createEllipse () { //Builds the ball image
try {
ball = ImageIO.read(new File("C:\\Users\\Home\\Desktop\\NO BORRAR porfavor\\Pelota.png"));
System.out.println(ball.getWidth(null)+" "+ball.getHeight(null));
} catch(IOException ex) {
System.out.println("Any balls were found");
}
balls.add(ball); //Balls are added to the collection
}
@Override
public void run () { //Moves the ball(coordinate system doesn't work)
moveBall(Animation.panel.getBounds());
}
public void moveBall(Rectangle2D limits) {
while(true) {
// while(Animation.running) {
System.out.println("X: "+X+"\tY: "+Y);
System.out.println(limits.getBounds());
X+=dX;
Y+=dY;
if(X<limits.getMinX()){
X=limits.getMinX();
dX=-dX;
}
if(X + width>=limits.getMaxX()){
X=limits.getMaxX()-width;
dX=-dY;
}
if(Y<limits.getMinY()){
Y=limits.getMinY();
dY=-dY;
}
if(Y + height>=limits.getMaxY()){
Y=limits.getMaxY()-height;
dY=-dY;
}
try {
Thread.sleep(4);
} catch (InterruptedException e) {
System.out.println("Interrupted");
}
repaint();
}
}
}
万一你想帮我;我不是要求完成工作,只是解释一下为什么它不起作用
# 1 楼答案
你似乎违反了Concurrency in Swing的基本规则。另外,您可以手动设置组件的边界,而不是using LayoutManagers(这就是为什么调整框架大小时,组件不在正确的位置)
现在,您在线程中启动应用程序,对吗?在这个线程中,您需要准备GUI并完成一些工作,然后在某个时候
while(true)
。当您while(true)
时,线程将“卡在”while循环中,因此无法发生swing事件。这就是为什么您必须while(true)
并在另一个线程中创建动画。但是,在Swing中创建动画的最佳方法是use a Swing Timer.我创建了一个示例,其中动画是每100ms在面板中创建一个新的随机矩形(10x10)。对它执行一些过期操作,并尝试将相同的逻辑调整到应用程序中(毕竟,您不会发布代码并期望我们为您修复:)
例如:
预览: