解决： 谢谢@MadProgrammer
我将g2.rotate(Math.toRadians(180.0));替换为g2.scale(1, -1);，感谢^^
我编写的程序用镜子显示数字时钟（垂直翻转）
这是我的代码
import java.awt.*;
import java.awt.font.GlyphVector;
import javax.swing.*;
import java.util.*;
public class DigitalClock extends JFrame implements Runnable {
/**
* @author HASSAN
*/
Thread runner; // declare global objects
Font clockFont;
Shape mirror;
public DigitalClock() {
super("Digital Clock - Hassan Sharaf 12MCMB33");
setSize(600, 500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setResizable(false); // create window
setLocationRelativeTo(null);
clockFont = new Font("digifacewide", Font.BOLD, 100); // create font
Container contentArea = getContentPane();
ClockPanel timeDisplay = new ClockPanel();
contentArea.add(timeDisplay); // add components
setContentPane(contentArea);
start(); // start thread running
}
public class ClockPanel extends JPanel {
public void paintComponent(Graphics painter) {
// super.paintComponent(painter);
Graphics2D g2 = (Graphics2D) painter;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setFont(clockFont); // create clock components
g2.setColor(Color.black);
g2.drawString(timeNow(), 20, 140);
GlyphVector v = clockFont.createGlyphVector(getFontMetrics(clockFont).getFontRenderContext(), timeNow());
mirror = v.getOutline();
g2.translate(553, 160);
g2.rotate(Math.toRadians(180.0));
g2.fill(mirror);
g2.draw(mirror);
}
}
// get current time
public String timeNow() {
Calendar now = Calendar.getInstance();
int hrs = now.get(Calendar.HOUR_OF_DAY);
int min = now.get(Calendar.MINUTE);
int sec = now.get(Calendar.SECOND);
String time = zero(hrs) + ":" + zero(min) + ":" + zero(sec);
return time;
}
public String zero(int num) {
String number = (num < 10) ? ("0" + num) : ("" + num);
return number; // Add leading zero if needed
}
public void start() {
if (runner == null) {
runner = new Thread(this);
}
runner.start();
// method to start thread
}
public void run() {
while (runner == Thread.currentThread()) {
repaint();
// define thread task
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
System.out.println("Thread failed");
}
}
}
// create main method
public static void main(String[] args) {
DigitalClock clock = new DigitalClock();
}
}
问题：我使用了rotate（）方法，但实际上我不想旋转时钟我想垂直翻转它 问题：如何翻转形状（不是图片）？
答案 0 :(得分：3)
根据你想要达到的目标，你有很多选择......
你可以......
PathIterator从形状对象创建AffineTransform。这将要求您创建一个新路径，将PathIterator附加到它，以便您可以绘制它...或Path2D传递给它，创建一个新的AffineTransform。这与第一个选项几乎相同，但需要的代码更少...... 这是一个例子......
public class SpinningTriangle {
public static void main(String[] args) {
new SpinningTriangle();
}
public SpinningTriangle() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new SpinPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class SpinPane extends JPanel {
private Triangle triangle;
private float angle = 0;
public SpinPane() {
triangle = new Triangle(50, 100);
Timer timer = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
angle += 2;
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(110, 110);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Rectangle bounds = triangle.getBounds();
// PathIterator pi = triangle.getPathIterator(AffineTransform.getRotateInstance(Math.toRadians(angle), bounds.width / 2, bounds.height / 2));
// Path2D path = new Path2D.Float();
// path.append(pi, true);
Path2D path = new Path2D.Float(triangle, AffineTransform.getRotateInstance(Math.toRadians(angle), bounds.width / 2, bounds.height / 2));
int x = (getWidth() - bounds.width) / 2;
int y = (getHeight() - bounds.height) / 2;
g2d.translate(x, y);
g2d.setColor(Color.RED);
g2d.fill(path);
g2d.setColor(Color.YELLOW);
g2d.draw(path);
g2d.dispose();
}
}
public class Triangle extends Path2D.Float {
public Triangle(int width, int height) {
moveTo(width / 2f, 0);
lineTo(width, height);
lineTo(0, height);
closePath();
}
}
}
<强>已更新
如果您只想“镜像”形状，则可以按-1缩放轴...
public class SpinningTriangle {
public static void main(String[] args) {
new SpinningTriangle();
}
public SpinningTriangle() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new FlipPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class FlipPane extends JPanel {
private Triangle triangle;
private boolean flip;
public FlipPane() {
triangle = new Triangle(50, 100);
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
flip = !flip;
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.start();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(110, 110);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Rectangle bounds = triangle.getBounds();
double scale = 1 * (flip ? -1 : 1);
Path2D path = new Path2D.Float(triangle, AffineTransform.getScaleInstance(scale, scale));
int x = (getWidth() - bounds.width) / 2;
int y = (getHeight() - bounds.height) / 2;
if (flip) {
y += bounds.height;
x += bounds.width;
}
g2d.translate(x, y);
g2d.setColor(Color.RED);
g2d.fill(path);
g2d.setColor(Color.YELLOW);
g2d.draw(path);
g2d.dispose();
}
}
public class Triangle extends Path2D.Float {
public Triangle(int width, int height) {
moveTo(width / 2f, 0);
lineTo(width, height);
lineTo(0, height);
closePath();
}
}
}