Java JLabel 中的旋转图标

Question

您好，我在尝试旋转 JLabel 内的图像时遇到问题。我从 Whosebug 获得这段代码，我试图稍微改变它，以便在 Tab 中旋转的图像在 JLabel 中旋转。

public class ProgressTabbedPane {

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            JFrame frame = new JFrame("RotatingIcon"); 
            JTabbedPane tabbedPane = new JTabbedPane();
            JLabel lable = new JLabel();



            tabbedPane.addTab("Searching", new RotatingIcon(new ImageIcon("disk.png"), tabbedPane, 10), new JLabel( /*new ImageIcon( "resources/images/rotatingIcon.gif" )*/));               
            frame.getContentPane().add(tabbedPane);                
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            //frame.setUndecorated(true);
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);

        }
    });
}

private static class RotatingIcon implements Icon {

    private final Icon delegateIcon;
    private double angleInDegrees = 90;
    final private Timer rotatingTimer;

    private RotatingIcon(Icon icon, final JComponent component, int vrotating) {
        delegateIcon = icon;
        rotatingTimer = new Timer(vrotating, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                angleInDegrees = angleInDegrees + 1;
                if (angleInDegrees == 360) {
                    angleInDegrees = 0;
                }
                component.repaint();

            }
        });
        rotatingTimer.setRepeats(false);
        rotatingTimer.start();

    }

    @Override
    public void paintIcon(Component c, Graphics g, int x, int y) {
        rotatingTimer.stop();
        Graphics2D g2 = (Graphics2D) g.create();
        int cWidth = delegateIcon.getIconWidth() / 2;
        int cHeight = delegateIcon.getIconHeight() / 2;
        Rectangle r = new Rectangle(x, y, delegateIcon.getIconWidth(), delegateIcon.getIconHeight());
        g2.setClip(r);
        AffineTransform original = g2.getTransform();
        AffineTransform at = new AffineTransform();
        at.concatenate(original);
        at.rotate(Math.toRadians(angleInDegrees), x + cWidth, y + cHeight);
        g2.setTransform(at);
        delegateIcon.paintIcon(c, g2, x, y);
        g2.setTransform(original);
        rotatingTimer.start();
    }

    @Override
    public int getIconWidth() {
        return delegateIcon.getIconWidth();
    }

    @Override
    public int getIconHeight() {
        return delegateIcon.getIconHeight();
    }
}

} 这正在工作，图像正在旋转。但是当我把它改成这个时。

public class ProgressTabbedPane {

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        @Override
        public void run() {
            JFrame frame = new JFrame("RotatingIcon"); 
            JTabbedPane tabbedPane = new JTabbedPane();
            JLabel lable = new JLabel();




            lable.setIcon(new RotatingIcon(new ImageIcon(disk.png"), tabbedPane, 10));                
            frame.getContentPane().add(lable);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            //frame.setUndecorated(true);
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);

        }
    });
}

private static class RotatingIcon implements Icon {

    private final Icon delegateIcon;
    private double angleInDegrees = 90;
    final private Timer rotatingTimer;

    private RotatingIcon(Icon icon, final JComponent component, int vrotating) {
        delegateIcon = icon;
        rotatingTimer = new Timer(vrotating, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                angleInDegrees = angleInDegrees + 1;
                if (angleInDegrees == 360) {
                    angleInDegrees = 0;
                }
                component.repaint();

            }
        });
        rotatingTimer.setRepeats(false);
        rotatingTimer.start();

    }

    @Override
    public void paintIcon(Component c, Graphics g, int x, int y) {
        rotatingTimer.stop();
        Graphics2D g2 = (Graphics2D) g.create();
        int cWidth = delegateIcon.getIconWidth() / 2;
        int cHeight = delegateIcon.getIconHeight() / 2;
        Rectangle r = new Rectangle(x, y, delegateIcon.getIconWidth(), delegateIcon.getIconHeight());
        g2.setClip(r);
        AffineTransform original = g2.getTransform();
        AffineTransform at = new AffineTransform();
        at.concatenate(original);
        at.rotate(Math.toRadians(angleInDegrees), x + cWidth, y + cHeight);
        g2.setTransform(at);
        delegateIcon.paintIcon(c, g2, x, y);
        g2.setTransform(original);
        rotatingTimer.start();
    }

    @Override
    public int getIconWidth() {
        return delegateIcon.getIconWidth();
    }

    @Override
    public int getIconHeight() {
        return delegateIcon.getIconHeight();
    }
}

}

这停止工作，如果这是一个愚蠢的问题，我很抱歉，但我似乎找不到答案。

谢谢

Answer 1

一种画法，只能用来画东西。它不应该 stop/start 一个定时器。所以我猜想你需要从绘画方法中去掉定时器逻辑，然后将定时器设置为重复，以便生成连续的事件。

有关替代方法，请查看 Animated Icon。

Animated Icon 将保存一个图标列表，以根据计时器顺序显示。当计时器触发循环中的下一个图标时，将显示。您可以将动画配置为连续播放或指定循环显示每个图标的次数。

注意：此解决方案应该更有效，因为它只重绘图标，而不是整个组件。

如果您不喜欢为动画创建所有图标的想法，那么您可以使用 Rotated Icon。使用此 class 您可以设置图标的旋转度数。然后 Timer 与 class 完全分离。然后，当定时器代码触发时，您将增加旋转度数。

使用 AnimatedIcon 的简单示例：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SSCCE extends JPanel
{
    public SSCCE()
    {
        setLayout( new BorderLayout() );

        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.add("1", new JPanel());
        tabbedPane.add("2", new JPanel());
        add(tabbedPane);

        AnimatedIcon icon = new AnimatedIcon(tabbedPane, 250, 3);
        ImageIcon duke = new ImageIcon( "copy16.gif" );
        icon.addIcon( duke );

        for (int angle = 30; angle < 360; angle += 30)
        {
            icon.addIcon( new RotatedIcon(duke, angle) );
        }

        tabbedPane.setIconAt(0, icon);
        icon.start();
    }


    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("SSCCE");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new SSCCE());
        frame.setLocationByPlatform( true );
        frame.pack();
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater( () -> createAndShowGUI() );
/*
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowGUI();
            }
        });
*/
    }
}

Java JLabel 中的旋转图标

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