java – 如何停止我的paint方法表单重复两次？
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内容图文
这是我正在处理的骰子游戏的代码,它将结果输出到窗口.油漆方法重复两次,这对我不利,因为我想让骰子滚动一次然后移动到下一帧.请有人帮我解决这个问题.先感谢您.
import java.awt.*;
import java.util.Random;
import javax.swing.*;
public class Dice extends JApplet {
public static int pause(int n)
{
try {
Thread.sleep(n);
} catch(InterruptedException e) {
}
return n;
}
public void Dice() {
JApplet app = new Dice();
JFrame frame = new JFrame("Dice Game");
frame.setBounds(30, 50, 1300, 650);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.add(app);
}
public void paint(Graphics g) {
int width = getWidth();
int height = getHeight();
int num = 0;
for (int i = 0; i < 7; i++) {
Random generator= new Random();
int number = generator.nextInt(6)+1;
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
g.setColor(Color.BLACK);
g.drawRoundRect(550, 150, 200, 200, 50, 50);
System.out.println("Test");
if (number == 1) { //Roll one
num = 1;
g.setColor(new Color (0, 0, 0));
g.fillOval(640, 240, 20, 20);
pause(100);
} if (number == 2) { //Roll two
num = 2;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 290, 20, 20);
g.fillOval(690, 190, 20, 20);
pause(100);
} if (number == 3) { //Roll three
num = 3;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 290, 20, 20);
g.fillOval(640, 240, 20, 20);
g.fillOval(690, 190, 20, 20);
pause(100);
} if (number == 4) { //Roll four
num = 4;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 290, 20, 20);
g.fillOval(590, 190, 20, 20);
g.fillOval(690, 290, 20, 20);
g.fillOval(690, 190, 20, 20);
pause(100);
} if (number == 5) { //Roll five
num = 5;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 290, 20, 20);
g.fillOval(590, 190, 20, 20);
g.fillOval(640, 240, 20, 20);
g.fillOval(690, 290, 20, 20);
g.fillOval(690, 190, 20, 20);
pause(100);
} if (number == 6) { //Roll six
num = 6;
g.setColor(new Color (0, 0, 0));
g.fillOval(590, 190, 20, 20);
g.fillOval(590, 240, 20, 20);
g.fillOval(590, 290, 20, 20);
g.fillOval(690, 190, 20, 20);
g.fillOval(690, 240, 20, 20);
g.fillOval(690, 290, 20, 20);
pause(100);
}
}
g.setFont(new Font("TimesRoman", Font.PLAIN, 20));
g.drawString("You rolled a " + num, 590, 100);
pause(1000);
}
}
解决方法:
>简短的回答是 – 你做不到.您无法控制何时进行绘制,这是RepaintManager的域.
>您也不应该在Event Dispatching Thread的上下文中调用Thread.sleep,尤其不要在任何paint方法中调用
>您应该避免覆盖绘制,而是使用paintComponent
>你应该避免从JFrame扩展而是使用类似JPanel的东西,它实际上有一个paintComponent方法.
>这种性质的动画最好通过使用Swing Timer来实现,这将允许员工在EDT之外保持暂停,但在EDT内再次触发,使得执行绘画和更新更安全
看一眼
> Concurrency in Swing
> How to Use Swing Timers
> Performing Custom Painting
> Painting in AWT and Swing
有关绘画如何在Swing中工作的更多细节以及如何实现您想要做的事情
更新了工作示例
因为我很懒,我使用了Graphics 2D API绘制点.我之所以这样做,是因为许多数字出现在许多数字的相同位置……
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class DiceRoller {
public static void main(String[] args) {
new DiceRoller();
}
public DiceRoller() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new Die());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class Die extends JPanel {
private int number = 1;
public Die() {
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
number = (int) (Math.round((Math.random() * 5) + 1));
repaint();
}
});
timer.setRepeats(true);
timer.setInitialDelay(0);
timer.start();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(220, 220);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int width = getWidth();
int height = getHeight();
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, width, height);
g2d.setColor(Color.BLACK);
g2d.drawRoundRect(10, 10, width - 20, height - 20, 50, 50);
List<Shape> dots = new ArrayList<>(6);
if (number == 1 || number == 3 || number == 5) {
int x = (width - 20) / 2;
int y = (height - 20) / 2;
dots.add(new Ellipse2D.Float(x, y, 20, 20));
}
if (number == 2 || number == 3 || number == 4 || number == 5 || number == 6) {
int x = ((width / 2) - 20) / 2;
int y = ((height / 2) - 20) / 2;
dots.add(new Ellipse2D.Float(x, y, 20, 20));
dots.add(new Ellipse2D.Float(x + (width / 2), y + (height / 2), 20, 20));
}
if (number == 4 || number == 5 || number == 6) {
int x = (width / 2) + (((width / 2) - 20) / 2);
int y = ((height / 2) - 20) / 2;
dots.add(new Ellipse2D.Float(x, y, 20, 20));
dots.add(new Ellipse2D.Float(x - (width / 2), y + (height / 2), 20, 20));
}
if (number == 6) {
int x = (((width / 2) - 20) / 2);
int y = (height - 20) / 2;
dots.add(new Ellipse2D.Float(x, y, 20, 20));
dots.add(new Ellipse2D.Float(x + (width / 2), y, 20, 20));
}
for (Shape dot : dots) {
g2d.fill(dot);
}
g2d.dispose();
}
}
}
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