有什么办法可以旋转这个 90 度吗？

Question

这是我当前的代码：

package Calendar;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;

public class Clock extends JLabel {
    private String pattern;
    private Timer timer;

public Clock(String pattern){
    this.pattern = pattern;
    createTimer();
    timer.start();
}

public Clock(){
    pattern = "hh:mm:ss a";
    createTimer();
    timer.start();
}

private void createTimer(){
    timer = new Timer(0, new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent arg0) {
            setText(new SimpleDateFormat(pattern).format(new Date()));
        }
    });
}

public static void main(String[] args){
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel contentPane = new JPanel();
    frame.setContentPane(contentPane);
    Clock digitalClock = new Clock();
    contentPane.add(digitalClock);
    frame.setVisible(true);
}
}

我终其一生都无法弄清楚如何旋转它。我查看了其他几个论坛，但没有其他人与此问题有关。

据我所知，没有办法旋转 JPanel 或 JFrame，所以我不走运吗？

这就是现在的样子：

Digital Clock

我想得到它，使文本旋转 90 度。基本上是垂直的。

编辑：解决方案：

    package Calendar;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JLabel;
import javax.swing.Timer;
import java.awt.*;
import java.awt.geom.*;

public class Clock extends JLabel {

    private String pattern;
    private Timer timer;

    public Clock ()
    {
        super();
        pattern = "hh:mm:ss a";
        createTimer();
        timer.start();
    }

    public Clock(String pattern)
    {
        super (pattern);
        this.pattern = pattern;
        createTimer();
        timer.start();
    }

    private void createTimer(){
        timer = new Timer(0, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent arg0) {
                setText(new SimpleDateFormat(pattern).format(new Date()));
            }
        });
    }

    public void paint (Graphics g)
    {
        if (g instanceof Graphics2D) {
            Graphics2D g2 = (Graphics2D) g;
            AffineTransform flipTrans = new AffineTransform();
            double widthD = (double) getWidth();
            flipTrans.setToRotation(-Math.PI / 2.0, getWidth() / 2.0, getHeight() / 2.0);
            g2.setTransform(flipTrans);
            super.paint(g);
        } else {
            super.paint(g);
        }
    }
}

Answer 1

这是基于this example 并利用JXLayer 以您想要的方式物理旋转标签组件。

它还使您不必自己进行任何自定义绘画。

我使用了类似的技术来旋转 JTabbedPane 选项卡，使它们垂直向下延伸到 JTabbedPane 的一侧

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.jdesktop.jxlayer.JXLayer;
import org.pbjar.jxlayer.demo.TransformUtils;
import org.pbjar.jxlayer.plaf.ext.transform.DefaultTransformModel;

public class RotateClock {

    public static void main(String[] args) {
        new RotateClock();
    }

    public RotateClock() {
        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 ExamplePane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class ExamplePane extends JPanel {

        private JSlider slider;
        private Clock clock;
        private DefaultTransformModel transformModel;

        public ExamplePane() {

            setLayout(new BorderLayout());

            slider = new JSlider(0, 360);
            slider.setValue(0);
            slider.setSnapToTicks(true);
            slider.setPaintTicks(true);
            slider.setMajorTickSpacing(10);
            slider.addChangeListener(new ChangeListener() {
                @Override
                public void stateChanged(ChangeEvent e) {

                    transformModel.setRotation(Math.toRadians(slider.getValue()));

                }
            });

            clock = new Clock();

            transformModel = new DefaultTransformModel();
            transformModel.setRotation(Math.toRadians(0));
            transformModel.setScaleToPreferredSize(true);
            JXLayer<JComponent> rotatePane = TransformUtils.createTransformJXLayer(clock, transformModel);

            add(slider, BorderLayout.NORTH);
            add(rotatePane);

        }
    }

    public class Clock extends JLabel {

        private String pattern;
        private Timer timer;

        public Clock(String pattern) {
            this.pattern = pattern;
            setText(new SimpleDateFormat(pattern).format(new Date()));
            createTimer();
            timer.start();
        }

        public Clock() {
            this("hh:mm:ss a");
        }

        private void createTimer() {
            timer = new Timer(0, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent arg0) {
                    setText(new SimpleDateFormat(pattern).format(new Date()));
                }
            });
            timer.setInitialDelay(0);
        }
    }

}

除其他外，这涉及鼠标事件的异常和组件的首选大小。

很遗憾，执行转换所需的代码（Piet 的示例）在网上不再提供

我已将 JXLayer（第 3 版）的所有源代码和 Piet 的示例放在一个 zip 中，我建议，如果您有兴趣，请获取一份副本并将其存储在安全的地方。