问题描述
我试图创建一个自定义的抗锯齿JLabel
,但是我的文字仍然很刻板.为什么不起作用?
I've attempted to create a custom anti-aliased JLabel
, but my text remains rigid. Why doesn't this work?
类似问题的答案包括更多详细的解决方案,但我想知道为什么它不起作用.
The answers to similar questions include more verbose solutions, but I want to know why this isn't working.
这是SSCCE:
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Tester {
public static void main(String[] args) {
SmoothLabel label = new SmoothLabel("Hello");
label.setFont(new Font("Times New Roman", Font.PLAIN, 100));
JFrame frame = new JFrame("SmoothLabel test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setLocationRelativeTo(null);
frame.add(label);
frame.setVisible(true);
}
}
class SmoothLabel extends JLabel {
String text;
public SmoothLabel (String text) {
super(text);
this.text = text;
}
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
super.paintComponent(g2d);
}
}
当字体大小为100时,我得到以下输出,该输出似乎没有抗锯齿:
When I have the font size at 100, I get the following output, which doesn't appear to be anti-aliased:
将字体设置为150,它似乎突然被消除了锯齿:
Setting the font to 150, it suddenly appears to be anti-aliased:
推荐答案
屏幕截图
由以下人员呈现的文本的屏幕截图
Screenshots
Screenshots of text rendered by:
-
Graphics2D
,带有RenderingHints.VALUE_TEXT_ANTIALIAS_ON
(绿色边框) - 标准
JLabel
(蓝色边框) - 强制执行
RenderingHints.VALUE_TEXT_ANTIALIAS_ON
(红色边框)的SmoothLabel
Graphics2D
withRenderingHints.VALUE_TEXT_ANTIALIAS_ON
(green border)- A standard
JLabel
(blue border) - A
SmoothLabel
that enforcesRenderingHints.VALUE_TEXT_ANTIALIAS_ON
(red border)
金属
Metal
SmoothLabel
支持/强制在所有测试的PLAF中使用抗锯齿文本.此处唯一没有使用 抗锯齿文字的PLAF是CDE/Motif.
The SmoothLabel
supports/enforces anti-aliased text in all PLAFs tested. The only PLAF here that does not already use anti-aliased text is CDE/Motif.
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.LineBorder;
import java.io.*;
import javax.imageio.ImageIO;
class FontAntialiasingInSwingPLAFs {
private JPanel gui = new JPanel(new BorderLayout(2, 2));
String[] types = {"Graphics2D", "JLabel", "SmoothLabel"};
private JLabel[] labels = {
new JLabel(""), new JLabel(""), new SmoothLabel("")
};
private JLabel[] scaleLabels = {
new JLabel(""), new JLabel(""), new JLabel("")
};
private Color[] colors = {Color.GREEN, Color.BLUE, Color.RED};
private JComboBox<String> plaf = null;
private UIManager.LookAndFeelInfo[] plafs;
FontAntialiasingInSwingPLAFs() {
initComponents();
}
private final void initComponents() {
// here we design the layout and controls..
JToolBar tb = new JToolBar("Controls");
tb.setFloatable(false);
gui.add(tb, BorderLayout.PAGE_START);
Action save = new AbstractAction("Save") {
@Override
public void actionPerformed(ActionEvent e) {
saveImages();
}
};
tb.add(save);
tb.addSeparator();
plafs = UIManager.getInstalledLookAndFeels();
plaf = new JComboBox<String>() {
@Override
public Dimension getMaximumSize() {
return super.getPreferredSize();
}
};
for (UIManager.LookAndFeelInfo info : plafs) {
plaf.addItem(info.getName());
}
tb.add(plaf);
ActionListener plafListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
changePLAF();
}
};
plaf.addActionListener(plafListener);
JPanel normalSize = new JPanel(new GridLayout(0, 3, 2, 2));
gui.add(normalSize);
for (int ii = 0; ii < labels.length; ii++) {
labels[ii].setBorder(new LineBorder(colors[ii]));
normalSize.add(labels[ii]);
}
JPanel scaledSize = new JPanel(new GridLayout(0, 3, 2, 2));
gui.add(scaledSize, BorderLayout.PAGE_END);
for (int ii = 0; ii < scaleLabels.length; ii++) {
scaledSize.add(scaleLabels[ii]);
}
setText();
}
private void setText() {
String plafName = (String) plaf.getSelectedItem();
for (int ii = 1; ii < labels.length; ii++) {
labels[ii].setText(plafName + " " + types[ii]);
}
labels[0].setIcon(new ImageIcon(getImage(plafName + " " + types[0])));
}
private void setScaledImages() {
Dimension d = labels[0].getSize();
for (int ii = 0; ii < labels.length; ii++) {
BufferedImage scaledImage = getScaledImage(ii, 4, 200);
scaleLabels[ii].setIcon(new ImageIcon(scaledImage));
}
}
private BufferedImage getScaledImage(
int index, int scale, int max) {
BufferedImage input = getImage(index);
int w = input.getWidth() * scale;
int h = input.getHeight() * scale;
w = w > max ? max : w;
h = h > max ? max : h;
BufferedImage temp = new BufferedImage(
w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = temp.createGraphics();
// do the drawing..
g.scale(scale, scale);
g.drawImage(input, 0, 0, gui);
g.dispose();
return temp;
}
private BufferedImage getImage(int index) {
JLabel input = labels[index];
int w = input.getWidth();
int h = input.getHeight();
BufferedImage temp = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = temp.createGraphics();
// do the drawing..
input.paintAll(g);
g.dispose();
return temp;
}
private BufferedImage getImage(String text) {
int w = 5;
int h = 5;
BufferedImage temp = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = temp.createGraphics();
FontRenderContext frc = g.getFontRenderContext();
Font f = labels[1].getFont();
GlyphVector gv = f.createGlyphVector(frc, text);
Shape s1 = gv.getOutline();
Shape s = gv.getOutline(-s1.getBounds().x, -s1.getBounds().y);
Rectangle textBounds = s.getBounds();
// recreate the image at the required size
temp = new BufferedImage(
textBounds.width,
textBounds.height,
BufferedImage.TYPE_INT_ARGB);
// get the graphics object of the new image
g = temp.createGraphics();
g.setFont(f);
// set a RenderingHints.KEY_TEXT_ANTIALIASING
g.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g.setColor(Color.BLACK);
// do the drawing..
g.drawString(text, 0, textBounds.height);
g.dispose();
return temp;
}
private final void changePLAF() {
int selected = plaf.getSelectedIndex();
try {
UIManager.setLookAndFeel(plafs[selected].getClassName());
Container c = gui.getTopLevelAncestor();
SwingUtilities.updateComponentTreeUI(c);
setText();
setScaledImages();
if (c instanceof Window) {
Window w = (Window) c;
w.pack();
} else {
System.err.println(c.getClass().getSimpleName());
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
private final String getImageName(int index, boolean scaled) {
String name = "";
String sText = scaled ? " Scaled" : "";
if (index == 0) {
name = (String)plaf.getSelectedItem() + " " + types[0];
} else {
String text = labels[index].getText();
name = text;
}
String sPattern = "\\/";
name = name.replaceAll(sPattern, "-");
return name + sText + ".png";
}
private final void saveImages() {
File f = new File(System.getProperty("user.home"));
f = new File(f, "zundry");
f = new File(f, "font-antialias");
boolean success = true;
if (!f.exists()) {
success = f.mkdirs();
}
if (success) {
// save the images!
for (int ii = 0; ii < labels.length; ii++) {
try {
File tempSmall = new File(f, getImageName(ii, false));
ImageIO.write(getImage(ii), "png", tempSmall);
File tempScaled = new File(f, getImageName(ii, true));
ImageIO.write(getScaledImage(ii, 4, 200), "png", tempScaled);
Desktop.getDesktop().open(f);
} catch (IOException ex) {
ex.printStackTrace();
}
}
} else {
System.err.println(
"The directory could not be created! "
+ f.getAbsolutePath());
}
}
public JComponent getGui() {
return gui;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
FontAntialiasingInSwingPLAFs fawp =
new FontAntialiasingInSwingPLAFs();
JOptionPane.showMessageDialog(null, fawp.getGui());
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater(r);
}
}
class SmoothLabel extends JLabel {
public SmoothLabel(String text) {
super(text);
}
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
super.paintComponent(g2d);
}
}
这篇关于抗锯齿JLabel的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!