Java2D 图形抗锯齿
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原文地址: http://stackoverflow.com/questions/4285464/
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Java2D Graphics anti-aliased
提问by Prakash
I am new to Java and trying to use Java2D Graphics to create a Image. But the output is coming as anti-aliased. I tried many ways to rectify it but doesn't work. The characters are getting distorted or jagged.
我是 Java 新手并尝试使用 Java2D 图形来创建图像。但是输出是抗锯齿的。我尝试了很多方法来纠正它，但没有奏效。字符变得扭曲或锯齿状。
public BufferedImage createNameOnButton(String label) {
int messageWidth = 0;
Font font = new Font("Arial", Font.PLAIN, 11);
BufferedImage bi = new BufferedImage(
10, 10, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = (Graphics2D) bi.getGraphics();
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2d.setRenderingHint(
RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setFont(font);
bi = g2d.getDeviceConfiguration()
.createCompatibleImage(500, 30, Transparency.BITMASK);
FontMetrics fm = bi.getGraphics().getFontMetrics(font);
int messageHeight = fm.getHeight() - fm.getDescent();
for (char ch : label.toCharArray()) {
messageWidth += fm.charWidth(ch);
}
bi = bi.getSubimage(50, 0, messageWidth + 10, fm.getHeight());
Graphics g = bi.getGraphics();
g.setColor(Color.black);
AttributedString as = new AttributedString(label);
as.addAttribute(TextAttribute.FONT, font);
g.drawString(as.getIterator(), 5, messageHeight);
g2d.dispose();
g.dispose();
return bi;
}
Can anyone please help me to rectify the error?
任何人都可以帮我纠正错误吗？
回答by Jim
As Traroth mentioned it is more than likely due to
正如 Traroth 提到的，这很可能是由于
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
Instead this should be
相反，这应该是
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
g2d.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
回答by trashgod
Assuming you actually want smooth (non-aliased) text, TextLayoutmay make this easier. The FontRenderContextconstructor can manage the anti-aliasing and fractional metrics settings.
假设您实际上想要平滑（无锯齿）文本，TextLayout可能会使这更容易。该FontRenderContext构造可以管理抗锯齿和小数规格设置。
Addendum: Using g2d.setColor(Color.blue)seems to produce the expected effect.
附录：使用g2d.setColor(Color.blue)似乎产生了预期的效果。
Addendum: On Mac OS X, the Pixieapplication in /Developer/Applications/Graphics Tools/is convenient for examining the anti-alias pixels. On other platforms, Zoommay be used.
附录：在 Mac OS X 上，Pixie应用程序/Developer/Applications/Graphics Tools/可以方便地检查抗锯齿像素。在其他平台上，Zoom可能会用到。
/** @see https://stackoverflow.com/questions/4285464 */
public class BITest extends JPanel {
private BufferedImage image = createNameOnButton("Sample");
public BITest() {
this.setPreferredSize(new Dimension(
image.getWidth(), image.getHeight()));
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, null);
}
public BufferedImage createNameOnButton(String label) {
Font font = new Font("Arial", Font.PLAIN, 64);
FontRenderContext frc = new FontRenderContext(null, true, true);
TextLayout layout = new TextLayout(label, font, frc);
Rectangle r = layout.getPixelBounds(null, 0, 0);
System.out.println(r);
BufferedImage bi = new BufferedImage(
r.width + 1, r.height + 1,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = (Graphics2D) bi.getGraphics();
g2d.setColor(Color.blue);
layout.draw(g2d, 0, -r.y);
g2d.dispose();
return bi;
}
private void display() {
JFrame f = new JFrame("BITest");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setUndecorated(true);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new BITest().display();
}
});
}
}
回答by Stefan Reich
I found that just this linedoes the trick:
我发现只有这一行才能解决问题：
g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
After that, just use drawString().
之后，只需使用drawString()。
