在Java的GUI编程中，如何检查是否启用抗锯齿？

以下示例演示如何使用RenderingHints类来检查是否打开了抗锯齿。

package com.yiibai;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JComponent;
import javax.swing.JFrame;

public class CheckAntialiasing {
    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.add(new MyComponent());
        frame.setSize(300, 300);
        frame.setVisible(true);
    }
}

class MyComponent extends JComponent {
    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        RenderingHints rh = g2.getRenderingHints();
        boolean bl = rh.containsValue(RenderingHints.VALUE_ANTIALIAS_ON);
        System.out.println(bl);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    }
}

上述代码示例将产生以下结果。

false
false

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