如何在java中调整文本大小 [英] How to resize text in java

问题描述

我已经看到，只需拖动它们就可以轻松调整photoshop文本的大小。我们怎样才能在Java中做同样的事情？关于如何在java中调整文本大小的任何想法？
在photoshop中添加了一个字母A的快照

I have seen that in photoshop text can be easily resized just by dragging them. How can we do the same thing in Java? Any idea on how to resize text in java? Added a snapshot of letter "A" resized in photoshop

请告诉我此代码有什么问题？

Please let me know what is wrong with this code?

public class ResizeImage extends JFrame {

    public ResizeImage(){
        JPanel panel = new JPanel(){
            public void paintComponent(Graphics g) {
                // In your paint(Graphics g) method
                // Create a buffered image for use as text layer
                BufferedImage textLayer = new BufferedImage(240, 240, 
                                              BufferedImage.TYPE_INT_RGB);

                // Get the graphics instance of the buffered image
            Graphics2D gBuffImg = textLayer.createGraphics();

                // Draw the string
                gBuffImg.drawString("Hello World", 10, 10);

                // Rescale the string the way you want it
                gBuffImg.scale(200, 50);

                // Draw the buffered image on the output's graphics object
                g.drawImage(textLayer, 0, 0, null);
                gBuffImg.dispose();
            }
        };
        add(panel);
    }

    public static void main(String [] args){
        ResizeImage frame = new ResizeImage();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        frame.setSize(300, 300);
        frame.setVisible(true);
    }
} 

推荐答案

一个方法是使用 AffineTransform （此变体也会淡化颜色）。

One way is to use an AffineTransform (this variant also fades the color).

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import javax.swing.*;
import java.io.File;
import javax.imageio.ImageIO;

public class StretchText {

    public static void main(String[] args) throws Exception {
        // used to stretch the graphics instance sideways
        AffineTransform stretch = new AffineTransform();
        int w = 640; // image width
        int h = 200; // image height
        int f = 21; // Font size in px
        String s = "The quick brown fox jumps over the lazy dog.";

        final BufferedImage bi = new BufferedImage(
                w,h,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        g.setFont(new Font("Serif",Font.PLAIN,f));
        g.setRenderingHint(
                RenderingHints.KEY_TEXT_ANTIALIASING, 
                RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

        // paint BG
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, w, h);
        g.setColor(Color.BLACK);

        for (int i=0; (i*f)+f<=h; i++) {
            g.drawString(s, 0, (i*f)+f);
            // stretch
            stretch.concatenate(
                    AffineTransform.getScaleInstance(1.18, 1d));
            g.setTransform(stretch);

            // fade
            Color c = g.getColor();
            g.setColor(new Color (
                    c.getRed(),
                    c.getGreen(),
                    c.getBlue(),
                    (int)(c.getAlpha()*.75)));
        }

        g.dispose();

        ImageIO.write(bi, "png", new File(
                new File(System.getProperty("user.home")), 
                "StretchText.png"));
        Runnable r = new Runnable() {
            @Override
            public void run() {
                JLabel gui = new JLabel(new ImageIcon(bi));
                JOptionPane.showMessageDialog(null, gui);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

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