我们可以将字符串属性用于切换“坏”符号的字体并用于Graphics2D.drawString(AttributedCharacterIterator iterator, int x, int y)
渲染结果。优点:这适用于任何字体。缺点:如果没有某种中间对象的缓存,这将运行得更慢和更脏。
所以,我建议AttributedString
在整个字符串上使用 main 字体属性:
AttributedString astr = new AttributedString(text);
astr.addAttribute(TextAttribute.FONT, mainFont, 0, textLength);
并在特定部分使用后备字体:
astr.addAttribute(TextAttribute.FONT, fallbackFont, fallbackBegin, fallbackEnd);
渲染本身:
g2d.drawString(astr.getIterator(), 20, 30);
结果(物理“Segoe Print”作为主要字体,逻辑“Serif”作为后备字体):
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完整的应该是 SSCCE 代码:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.font.TextAttribute;
import java.text.AttributedString;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class FontTest extends JFrame {
public FontTest() {
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
getContentPane().setLayout(new BorderLayout());
getContentPane().add(new TestStringComponent());
pack();
}
public static void main(String[] args) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new FontTest().setVisible(true);
}
});
}
}
class TestStringComponent extends JComponent {
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(getForeground());
Font mainFont = new Font("Segoe Print", Font.PLAIN, 25);
Font fallbackFont = new Font("Serif", Font.PLAIN, 25);
String s = "Test 漢鼎繁古印 Test 漢鼎繁古印 Test";
g2d.drawString(createFallbackString(s, mainFont, fallbackFont).getIterator(), 20, 30);
}
public Dimension getPreferredSize() {
return new Dimension(500, 40);
}
private AttributedString createFallbackString(String text, Font mainFont, Font fallbackFont) {
AttributedString result = new AttributedString(text);
int textLength = text.length();
result.addAttribute(TextAttribute.FONT, mainFont, 0, textLength);
boolean fallback = false;
int fallbackBegin = 0;
for (int i = 0; i < text.length(); i++) {
boolean curFallback = !mainFont.canDisplay(text.charAt(i));
if (curFallback != fallback) {
fallback = curFallback;
if (fallback) {
fallbackBegin = i;
} else {
result.addAttribute(TextAttribute.FONT, fallbackFont, fallbackBegin, i);
}
}
}
return result;
}
}