Polygon2Dの描画 | Codetter（こーどったー）

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import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Sample {
    public static void main(String[] args) {
        final Polygon2D polygon2d = new Polygon2D(new Point(40, 20), new Point(20, 80), new Point(80, 80));
        JPanel panel = new JPanel() {
            @Override
            public void paintComponent(Graphics g) {
                /* 
                 * ここでGraphics2Dにキャストしていいのかは微妙なところ・・・
                 * インタフェースはGraphicsなので具象クラスがGrahpics2Dだとは本来限らないはず。
                 */
                ((Graphics2D)g).draw(polygon2d);
            }
        };
        JFrame frame = new JFrame();
        frame.getContentPane().add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setBounds(20, 20, 100, 120);
        frame.setVisible(true);
    }
}
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