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java - 清除先前在图像上绘制的字符串

转载 作者：行者123 更新时间：2023-12-02 06:25:55 25 4
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我想知道如果我不清除字符串重叠，如何在在图像上绘制新字符串之前清除先前绘制的字符串。我已经尝试过graphics#drawRect和重写paintComponent(Graphics)，仍然没有评估。

这是我的代码:PaintComponent(图形)

public class SplashScreen extends JLabel
{

    private static final long serialVersionUID = 5515310205953670741L;

    private static final String ROOT = "./assets/img/";

    private static final SplashScreen INSTANCE = new SplashScreen( get( new File( ROOT, "splash.png" ) ), get( new File( ROOT, "splash-bar.png" ) ) );

    private final BufferedImage background;

    private final BufferedImage foreground;

    private final JLabel label;


    private SplashScreen( BufferedImage background, BufferedImage foreground )
    {
        this.background = background;
        this.foreground = foreground;
        label = new JLabel( new ImageIcon( background ) );

        JWindow window = new JWindow();
        window.setSize( background.getWidth(), background.getHeight() );
        window.getContentPane().add( label );
        Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
        window.setLocation( dimension.width / 2 - window.getSize().width / 2, dimension.height / 2 - window.getSize().height / 2 );
        window.setVisible( true );
    }


    public void updateStatus( String status )
    {
        Graphics g = background.getGraphics();

        g.drawString( status, 304, 301 );
        g.dispose();

        label.repaint();
    }


    public void updateBar( int width )
    {
        Graphics g = background.getGraphics();

        g.drawImage( foreground, 73, 309, width, foreground.getHeight(), null );
        g.dispose();

        label.repaint();
    }


    private static BufferedImage get( File file )
    {
        try {
            return ImageIO.read( file );
        } catch( IOException e ) {
            throw new RuntimeException( e.getMessage() );
        }
    }


    public static SplashScreen getInstance()
    {
        return INSTANCE;
    }

}

非常感谢任何帮助。 :-)

谢谢。

最佳答案

您不需要进行自定义绘画。

以下是使用图标在标签上绘制文本的几种不同方法:

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

public class LabelImageText extends JPanel
{
    public LabelImageText()
    {
        JLabel label1 = new JLabel( new ColorIcon(Color.ORANGE, 100, 100) );
        label1.setText( "Easy Way" );
        label1.setHorizontalTextPosition(JLabel.CENTER);
        label1.setVerticalTextPosition(JLabel.CENTER);
        add( label1 );

        //

        JLabel label2 = new JLabel( new ColorIcon(Color.YELLOW, 200, 150) );
        label2.setLayout( new BoxLayout(label2, BoxLayout.Y_AXIS) );
        add( label2 );

        JLabel text = new JLabel( "More Control" );
        text.setAlignmentX(JLabel.CENTER_ALIGNMENT);
        label2.add( Box.createVerticalGlue() );
        label2.add( text );
        label2.add( Box.createVerticalStrut(10) );

        //

        JLabel label3 = new JLabel( new ColorIcon(Color.GREEN, 200, 150) );
        add( label3 );

        JLabel text3 = new JLabel();
        text3.setText("<html><center>Text<br>over<br>Image<center></html>");
        text3.setLocation(20, 20);
        text3.setSize(text3.getPreferredSize());
        label3.add( text3 );

        //

        JLabel label4 = new JLabel( new ColorIcon(Color.CYAN, 200, 150) );
        add( label4 );

        JTextPane textPane = new JTextPane();
        textPane.setText("Add some text that will wrap at your preferred width");
        textPane.setEditable( false );
        textPane.setOpaque(false);
        SimpleAttributeSet center = new SimpleAttributeSet();
        StyleConstants.setAlignment(center, StyleConstants.ALIGN_CENTER);
        StyledDocument doc = textPane.getStyledDocument();
        doc.setParagraphAttributes(0, doc.getLength(), center, false);
        textPane.setBounds(20, 20, 75, 100);
        label4.add( textPane );
    }

    public static class ColorIcon implements Icon
    {
        private Color color;
        private int width;
        private int height;

        public ColorIcon(Color color, int width, int height)
        {
            this.color = color;
            this.width = width;
            this.height = height;
        }

        public int getIconWidth()
        {
            return width;
        }

        public int getIconHeight()
        {
            return height;
        }

        public void paintIcon(Component c, Graphics g, int x, int y)
        {
            g.setColor(color);
            g.fillRect(x, y, width, height);
        }
    }

    private static void createAndShowUI()
    {
        JFrame frame = new JFrame("LabelImageText");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( new LabelImageText() );
        frame.pack();
        frame.setLocationRelativeTo( null );
        frame.setVisible( true );
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                createAndShowUI();
            }
        });
    }
}

然后，要更改文本，您只需更改用于显示文本的组件中的文本。

如果这些都没有帮助，那么进行自定义绘制的方法是重写 JLabel 的 paintCompnent() 方法。您不应该直接在 BufferedImage 上绘制文本。

关于java - 清除先前在图像上绘制的字符串，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20534068/

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