我正在尝试做一个简单的7段显示并进行测试，我想制作一个简单的动画，该动画按顺序显示数字，并在1秒的数字绘制之间进行分隔，并且必须无限期运行，但是我无法弄清楚如何绘制显示本身（实现动画，没有动画，我知道如何一张一张地打印数字）。
PD：如果有人需要，我会为您提供所有源代码，但“动画”位于第120行，我在其中定义了运行动画的线程。
源代码：
public class MainWindow extends JFrame {
private JPanel contentPane;
private CustomRectangle custRect = null;
private JButton btnCancel;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainWindow frame = new MainWindow();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public MainWindow() {
getContentPane().setBackground(Color.BLACK);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setUndecorated(true);
setSize(400, 400);
contentPane = new JPanel();
contentPane.setLayout(null);
custRect = new CustomRectangle(getContentPane().getSize());
getContentPane().add(custRect);
getContentPane().add(getBtnCancel(), BorderLayout.SOUTH);
}
private Color complementaryColor(Color background) {
int alpha = background.getAlpha();
int red = background.getRed();
int blue = background.getBlue();
int green = background.getGreen();
// find compliments
red = (~red) & 0xff;
blue = (~blue) & 0xff;
green = (~green) & 0xff;
return new Color(red, green, blue, alpha);
}
private JButton getBtnCancel() {
if (btnCancel == null) {
btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
btnCancel.setBackground(null);
btnCancel.setBorder(null);
btnCancel.setForeground(complementaryColor(getContentPane().getBackground()));
btnCancel.setFocusPainted(false);
}
return btnCancel;
}
private class CustomRectangle extends JComponent {
private byte[] nums = new byte[] { 0x7E, 0x30, 0x6D, 0x79, 0x33, 0x5B, 0x5F, 0x70, 0x7F, 0x7B };
private double mainWidth = 0.0;
private double mainHeight = 0.0;
private Graphics2D g2d = null;
public CustomRectangle(Dimension size) {
mainWidth = size.getWidth();
mainHeight = size.getHeight();
}
public byte[] getNums() {
return nums;
}
@Override
public void paintComponent(Graphics g) {
g2d = (Graphics2D) g;
Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minutes = calendar.get(Calendar.MINUTE);
int seconds = calendar.get(Calendar.SECOND);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Thread th = new Thread() {
public void run() {
while(true) {
for(int i = 0; i < nums.length; i++)
generalCall(nums[i]);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};th.start();
}
public void generalCall(byte val) {
drawAHoursHigh(val);
drawBHoursHigh(val);
drawCHoursHigh(val);
drawDHoursHigh(val);
drawEHoursHigh(val);
drawFHoursHigh(val);
drawGHoursHigh(val);
}
private Color getColor(byte val, int shift) {
int r = 255;
int g = 0;
int b = 0;
int a = 255 * (val >> shift) & 1;
System.out.println("R: " + r + " G: " + g + " B: " + b + " Alpha: " + a);
if (a == 0)
return new Color(15, 15, 15);
else
return new Color(r, g, b);
}
private void drawAHoursHigh(byte val) {
System.out.print("A: ");
Shape a = new RoundRectangle2D.Double(60, 20, 78, 18, 10, 10);
g2d.setColor(getColor(val, 6));
g2d.fill(a);
g2d.draw(a);
}
private void drawBHoursHigh(byte val) {
System.out.print("B: ");
Shape b = new RoundRectangle2D.Double(140, 40, 18, 98, 10, 10);
g2d.setColor(getColor(val, 5));
g2d.fill(b);
g2d.draw(b);
}
private void drawCHoursHigh(byte val) {
System.out.print("C: ");
Shape c = new RoundRectangle2D.Double(140, 160, 18, 98, 10, 10);
g2d.setColor(getColor(val, 4));
g2d.fill(c);
g2d.draw(c);
}
private void drawDHoursHigh(byte val) {
System.out.print("D: ");
Shape d = new RoundRectangle2D.Double(60, 260, 78, 18, 10, 10);
g2d.setColor(getColor(val, 3));
g2d.fill(d);
g2d.draw(d);
}
private void drawEHoursHigh(byte val) {
System.out.print("E: ");
Shape e = new RoundRectangle2D.Double(40, 160, 18, 98, 10, 10);
g2d.setColor(getColor(val, 2));
g2d.fill(e);
g2d.draw(e);
}
private void drawFHoursHigh(byte val) {
System.out.print("F: ");
Shape f = new RoundRectangle2D.Double(40, 40, 18, 98, 10, 10);
g2d.setColor(getColor(val, 1));
g2d.fill(f);
g2d.draw(f);
}
private void drawGHoursHigh(byte val) {
System.out.print("G: ");
Shape g = new RoundRectangle2D.Double(60, 140, 78, 18, 10, 10);
g2d.setColor(getColor(val, 0));
g2d.fill(g);
g2d.draw(g);
}
}
}
答案 0 :(得分：0)
首先，请阅读：
有关绘画在Swing中如何工作的更多信息。
接下来，请阅读：
为了更好地理解Swing中的并发问题-简短的版本，Swing不是线程安全的，并且是单线程的。当您要执行重复操作以更新UI时，这会引起许多问题。
然后，请阅读How to Use Swing Timers以获得可行的解决方案。
让我们开始确定核心问题...
这个...
contentPane = new JPanel();
contentPane.setLayout(null);
通常不是一个好主意，但是您还是不使用它，所以它只是白噪声
这个...
custRect = new CustomRectangle(getContentPane().getSize());
是错误的，因为在您请求他contentPane的大小时，它尚未实现或在屏幕上没有布局，因此结果是0x0。无论如何，您都不应该依赖于此，如果您想知道容器的大小，请在实际需要时提出要求。
下一步...
private Graphics2D g2d = null;
您永远不应保留对未创建的任何图形上下文的引用。在Swing中，上下文在所有绘制的组件之间共享，这意味着它可能很脏，带有其他内容，或者被裁剪以排除要绘制的区域。
最后。。。
@Override
public void paintComponent(Graphics g) {
g2d = (Graphics2D) g;
Calendar calendar = Calendar.getInstance();
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minutes = calendar.get(Calendar.MINUTE);
int seconds = calendar.get(Calendar.SECOND);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Thread th = new Thread() {
public void run() {
while(true) {
for(int i = 0; i < nums.length; i++)
generalCall(nums[i]);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};th.start();
}
paintComponent将在Swing认为需要重新粉刷您的组件时被调用，第一次实现时，可能需要连续快速多次，这意味着您现在有Thread个运行。
绘制应该完成一项工作，绘制组件的当前上下文，别无其他。就您而言，Swing Timer是一个更可行，更安全的解决方案。
然后清理一下，看起来可能类似于...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.Timer;
public class MainWindow extends JFrame {
private CustomRectangle custRect = null;
private JButton btnCancel;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainWindow frame = new MainWindow();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public MainWindow() {
getContentPane().setBackground(Color.BLACK);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(400, 400);
custRect = new CustomRectangle();
getContentPane().add(custRect);
getContentPane().add(getBtnCancel(), BorderLayout.SOUTH);
}
private Color complementaryColor(Color background) {
int alpha = background.getAlpha();
int red = background.getRed();
int blue = background.getBlue();
int green = background.getGreen();
// find compliments
red = (~red) & 0xff;
blue = (~blue) & 0xff;
green = (~green) & 0xff;
return new Color(red, green, blue, alpha);
}
private JButton getBtnCancel() {
if (btnCancel == null) {
btnCancel = new JButton("Cancel");
btnCancel.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
btnCancel.setBackground(null);
btnCancel.setBorder(null);
btnCancel.setForeground(complementaryColor(getContentPane().getBackground()));
btnCancel.setFocusPainted(false);
}
return btnCancel;
}
private class CustomRectangle extends JComponent {
private byte[] nums = new byte[]{0x7E, 0x30, 0x6D, 0x79, 0x33, 0x5B, 0x5F, 0x70, 0x7F, 0x7B};
public CustomRectangle() {
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
repaint();
}
});
}
public byte[] getNums() {
return nums;
}
@Override
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
for (int i = 0; i < nums.length; i++) {
generalCall(g2d, nums[i]);
}
}
public void generalCall(Graphics2D g2d, byte val) {
drawAHoursHigh(g2d, val);
drawBHoursHigh(g2d, val);
drawCHoursHigh(g2d, val);
drawDHoursHigh(g2d, val);
drawEHoursHigh(g2d, val);
drawFHoursHigh(g2d, val);
drawGHoursHigh(g2d, val);
}
private Color getColor(byte val, int shift) {
int r = 255;
int g = 0;
int b = 0;
int a = 255 * (val >> shift) & 1;
System.out.println("R: " + r + " G: " + g + " B: " + b + " Alpha: " + a);
if (a == 0) {
return new Color(15, 15, 15);
} else {
return new Color(r, g, b);
}
}
private void drawAHoursHigh(Graphics2D g2d, byte val) {
System.out.print("A: ");
Shape a = new RoundRectangle2D.Double(60, 20, 78, 18, 10, 10);
g2d.setColor(getColor(val, 6));
g2d.fill(a);
g2d.draw(a);
}
private void drawBHoursHigh(Graphics2D g2d, byte val) {
System.out.print("B: ");
Shape b = new RoundRectangle2D.Double(140, 40, 18, 98, 10, 10);
g2d.setColor(getColor(val, 5));
g2d.fill(b);
g2d.draw(b);
}
private void drawCHoursHigh(Graphics2D g2d, byte val) {
System.out.print("C: ");
Shape c = new RoundRectangle2D.Double(140, 160, 18, 98, 10, 10);
g2d.setColor(getColor(val, 4));
g2d.fill(c);
g2d.draw(c);
}
private void drawDHoursHigh(Graphics2D g2d, byte val) {
System.out.print("D: ");
Shape d = new RoundRectangle2D.Double(60, 260, 78, 18, 10, 10);
g2d.setColor(getColor(val, 3));
g2d.fill(d);
g2d.draw(d);
}
private void drawEHoursHigh(Graphics2D g2d, byte val) {
System.out.print("E: ");
Shape e = new RoundRectangle2D.Double(40, 160, 18, 98, 10, 10);
g2d.setColor(getColor(val, 2));
g2d.fill(e);
g2d.draw(e);
}
private void drawFHoursHigh(Graphics2D g2d, byte val) {
System.out.print("F: ");
Shape f = new RoundRectangle2D.Double(40, 40, 18, 98, 10, 10);
g2d.setColor(getColor(val, 1));
g2d.fill(f);
g2d.draw(f);
}
private void drawGHoursHigh(Graphics2D g2d, byte val) {
System.out.print("G: ");
Shape g = new RoundRectangle2D.Double(60, 140, 78, 18, 10, 10);
g2d.setColor(getColor(val, 0));
g2d.fill(g);
g2d.draw(g);
}
}
}