Question

我实现了一个时钟，其中秒针和分针扩展了相同的组件JClockHand。我有这样的执行，但这不是我想要的。我想知道是否有任何可能的方法来设置Graphics z索引重叠不同的图形？提前谢谢。

sechand.png，https://app.box.com/s/pwwxxl9g0mparsg5fxghxwvtjjd58b25

minhand.png，https://app.box.com/s/mgwgx4odjexgt7qhyxr1tbcp68lkpy6x

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;

import javax.imageio.ImageIO;
import javax.swing.*;

public class ClockFrame extends JFrame {

    public ClockFrame(){
        JPanel panel = new JPanel();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        add(panel);
        setSize(1000, 1000);
        panel.setSize(getWidth(), getHeight());     
        panel.setLayout(new GridLayout());
        setVisible(true);
        setResizable(false);
        panel.setBackground(Color.BLACK);
        SecondHand sHand=new SecondHand("./res/icon/sechand.png");
        panel.add(sHand);
        MinuteHand mHand=new MinuteHand("./res/icon/minhand.png");
        panel.add(mHand);
        pack();
        setVisible(true);

    }
//start here
public class JClockHand extends JComponent{

    protected Dimension preferredSize=new Dimension(1000,1000);
    protected BufferedImage secImage;
    public void setIconPath(String iconPath){
        try {
            secImage = ImageIO.read(new File(iconPath));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
    public void rotate(Graphics2D g2d,BufferedImage img,double angleRad){
        double middle = preferredSize.getWidth() / 2d;

        g2d.translate(middle, middle); 
        AffineTransform at = AffineTransform.getTranslateInstance(middle, middle);
        at.rotate(angleRad);
        g2d.setTransform(at);        
        g2d.drawImage(img, 0, 0, this);         
    }    
    public Dimension getPreferredSize() {
        return preferredSize;
    }

}
class SecondHand extends JClockHand{

    private Timer timer;
    private Calendar currentTime;


    public SecondHand(String iconPath){
        currentTime = Calendar.getInstance();

        setIconPath(iconPath);
        timer = new Timer(50, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                currentTime.setTime(new Date(System.currentTimeMillis()));
                repaint();
            }
        });
        timer.start();
    }

    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        double angle = (currentTime.get(Calendar.SECOND)*2*Math.PI)/60d;
        rotate(g2d,secImage,angle);  
        g2d.dispose();
    }

}

public class MinuteHand extends JClockHand{

    private Timer timer;
    private Calendar currentTime;

    public MinuteHand(String iconPath) {

        currentTime = Calendar.getInstance();

        setIconPath(iconPath);
        timer = new Timer(50, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                currentTime.setTime(new Date(System.currentTimeMillis()));
                repaint();
            }
        });
        timer.start();
    }


    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        double angle = (currentTime.get(Calendar.MINUTE)*2*Math.PI)/60d;
        rotate(g2d,secImage,angle);  
        g2d.dispose();
    }


}
public static void main(String[] a) {
    ClockFrame c = new ClockFrame();
}   

}

Answer 1

使用JLayeredPane。喜欢这个

public ClockFrame(){
    int frameWidth = 1000;
    int frameHeight = 1000;
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setPreferredSize(new Dimension(frameWidth, frameHeight));
    setLayout(new BorderLayout());

    JLayeredPane pane = new JLayeredPane();
    pane.setOpaque(true);
    pane.setBackground(Color.BLACK);
    add(pane);

    SecondHand sHand=new SecondHand("sechand.png");
    MinuteHand mHand=new MinuteHand("minhand.png");

    mHand.setBounds(0, 0, frameWidth, frameHeight);
    sHand.setBounds(0, 0, frameWidth, frameHeight);

    pane.add(mHand, 1);
    pane.add(sHand, 2);

    pack();
    setResizable(false);
    setVisible(true);
}

您必须手动设置JLayeredPane组件的位置和大小，因为JLayeredPane不是LayoutManager

是否可以将z索引设置为java Graphics？

1 个答案: