如何将用户定义的文本放在图像上

Question

我想在图像上获取用户定义的文本，例如，如果我制作两个文本字段，一个用于名称，第二个用于日期，因此当我输入某人的姓名和日期时，输入后如果我单击确定，那么它将显示在该图像中。

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class billFrame extends JFrame 
{
    public billFrame()
    {
        JFrame f1 = new JFrame("Billng Application");
        f1.setDefaultCloseOperation(EXIT_ON_CLOSE);
        f1.setSize(500,500);
        f1.setBounds(30, 50, 500, 700);
        f1.setExtendedState(JFrame.MAXIMIZED_BOTH);
        ImageIcon icon = new 
        ImageIcon("C:\Users\Dhaval\Downloads\shrihari.png");
        Image image = icon.getImage();
        JPanel panel1; 
        panel1 = new JPanel() 
        {
            @Override
            protected void paintComponent(Graphics g) 
            {
                super.paintComponent(g);
                g.drawImage(image, 1400, 0, 500, 700, this);
            }
            @Override
            public Dimension getPreferredSize()
            {
                return new Dimension(320, 200);
            }
        };
        f1.add(panel1);
        panel1.setVisible(true);
        panel1.setLayout(null);
        JLabel name = new JLabel("Name :");
        name.setVisible(true);
        name.setLocation(100,100);
        name.setSize(100,100);
        panel1.add(name);
        JTextField namet = new JTextField();
        namet.setVisible(true);
        namet.setLocation(150, 137);
        namet.setSize(200,30);
        panel1.add(namet);
        f1.setVisible(true);
    }
    @SuppressWarnings("unchecked")                             
    public static void main(String args[]) 
    {
        billFrame bf = new billFrame();
    }                 
}

Answer 1

下面是示例：

static void addTextWatermark(String text, File sourceImageFile, File destImageFile) {
try {
    BufferedImage sourceImage = ImageIO.read(sourceImageFile);
    Graphics2D g2d = (Graphics2D) sourceImage.getGraphics();
    // initializes necessary graphic properties
    AlphaComposite alphaChannel = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1f);
    g2d.setComposite(alphaChannel);
    g2d.setColor(Color.BLUE);
    g2d.setFont(new Font("Arial", Font.BOLD, 64));
    FontMetrics fontMetrics = g2d.getFontMetrics();
    Rectangle2D rect = fontMetrics.getStringBounds(text, g2d);
    // calculates the coordinate where the String is painted
    int centerX = (sourceImage.getWidth() - (int) rect.getWidth()) / 2;
    int centerY = sourceImage.getHeight() / 2;
    // paints the textual watermark
    g2d.drawString(text, centerX, centerY);
    ImageIO.write(sourceImage, "png", destImageFile);
    g2d.dispose();
    System.out.println("The tex watermark is added to the image.");
} catch (IOException ex) {
    System.err.println(ex);
}
}

这是用法

File sourceImageFile = new     File("name.png");
File destImageFile = new    File("anothername.png");
addTextWatermark("Text", sourceImageFile, destImageFile);

或者你可以为此提供库。例如：http://www.gif4j.com