小さな円を描画するといびつになる(Java2D の Ellipse2D や Component の createImage の使用時)

import java.awt.*;

import java.awt.event.*;

import java.awt.geom.*;

import javax.swing.*;

import javax.swing.event.*;



public class JHelohelo extends JPanel {



    public void paintComponent(Graphics g) {

        super.paintComponent(g);

        g.setColor(Color.white);

        g.fillRect(0, 0, getWidth(), getHeight());



        // 上段(青、綺麗な形状)

        g.setColor(new Color(0, 0, 127));

        for (int i = 0; i < 20; i++) {

            g.drawOval(i * 25 + 10, 0 + 10, i, i);

        }



        // 中段(赤、少しいびつ)

        g.setColor(new Color(127, 0, 0));

        for (int i = 0; i < 20; i++) {

            Ellipse2D ellipse = new Ellipse2D.Float(i * 25 + 10, 40 + 10, i, i);

            ((Graphics2D) g).draw(ellipse);

        }



        // 下段(緑、とてもいびつ)

        int width = getWidth();

        int height = 40;

        Image image = createImage(width, height);

        Graphics gg = image.getGraphics();

        gg.setColor(Color.white);

        gg.fillRect(0, 0, width, height);

        gg.setColor(new Color(0, 127, 0));

        for (int i = 0; i < 20; i++) {

            gg.drawOval(i * 25 + 10, 0 + 10, i, i);

        }

        gg.dispose();

        g.drawImage(image, 0, 80, width, height, this);

    }



    public static void main(String[] args) {

        final JFrame f = new JFrame();

        f.addWindowListener(new WindowListener() {

            public void windowOpened(WindowEvent e) {

            }

            public void windowClosing(WindowEvent e) {

                f.dispose();

            }

            public void windowClosed(WindowEvent e) {

            }

            public void windowIconified(WindowEvent e) {

            }

            public void windowDeiconified(WindowEvent e) {

            }

            public void windowActivated(WindowEvent e) {

            }

            public void windowDeactivated(WindowEvent e) {

            }

        });

        JPanel p = new JHelohelo();

        f.getContentPane().add(p);

        f.setSize(new Dimension(600, 200));

        f.setVisible(true);

    }

}

	GeneralPath path = new GeneralPath();
	path.moveTo(5.0f, 2.5f);
	path.curveTo(5.0f, 3.8807118f, 3.8807118f, 5.0f, 2.5f, 5.0f);
	path.curveTo(1.1192881f, 5.0f, 0.0f, 3.8807118f, 0.0f, 2.5f);
	path.curveTo(0.0f, 1.1192881f, 1.1192881f, 0.0f, 2.5f, 0.0f);
	path.curveTo(3.8807118f, 0.0f, 5.0f, 1.1192881f, 5.0f, 2.5f);
	path.closePath();

	((Graphics2D)g).setRenderingHint(RenderingHints.KEY_ANTIALIASING,
					  RenderingHints.VALUE_ANTIALIAS_ON);

Ellipse2D ellipse = new Ellipse2D.Float(i * 25 + 10.4999F, 40 + 10.4999F, i, i);

        GeneralPath gp = new GeneralPath();
        gp.moveTo(10, 80);
        gp.lineTo(10, 20);
        gp.curveTo(9, 15, 15, 9, 20, 10);
        gp.lineTo(80, 10);
        gp.curveTo(85, 9, 91, 15, 90, 20);
        gp.lineTo(90, 80);
        ((Graphics2D) gg).draw(gp);