Java如何檢查是否啟用抗鋸齒？

在Java的GUI編程中，如何檢查是否啟用抗鋸齒？

以下示例演示如何使用RenderingHints類來檢查是否打開了抗鋸齒。

package com.zaixian;

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);
    }
}

上述代碼示例將產生以下結果。

false
false