[英]Java2D Graphics anti-aliased
我是Java的新手,並嘗試使用Java2D Graphics來創建Image。 但輸出是反鋸齒的。 我嘗試了很多方法來糾正它,但是沒有用。 角色變得扭曲或鋸齒狀。
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;
}
有誰可以幫我糾正錯誤?
假設您實際上想要平滑(無別名)文本, TextLayout
可以使這更容易。 FontRenderContext
構造函數可以管理抗鋸齒和小數度量設置。
附錄:使用g2d.setColor(Color.blue)
似乎產生了預期的效果。
附錄:在Mac OS X上, /Developer/Applications/Graphics Tools/
的Pixie
應用程序便於檢查抗鋸齒像素。 在其他平台上,可以使用Zoom
。
/** @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();
}
});
}
}
正如Traroth所說,它很可能是由於
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
相反,這應該是
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
g2d.setRenderingHint(
RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
我發現只有這一行才能解決問題:
g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
之后,只需使用drawString() 。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.