Java Graphics.fillPolygon: How to also render right and bottom edges?

Question

When drawing polygons, Java2D leaves off the right and bottom edges. I understand why this is done. However, I would like to draw something that includes those edges. One

Answer 1

I like the convenience of ImageIcon, shown by @HFOE, but this variation may make it a little easier to see what's happening. From the Graphics API,

Operations that draw the outline of a figure operate by traversing an infinitely thin path between pixels with a pixel-sized pen that hangs down and to the right of the anchor point on the path. Operations that fill a figure operate by filling the interior of that infinitely thin path.

In contrast, Graphics2D must follow more complex rules for antialiasing, which allow it to "draw outside the lines."

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JPanel;

/** @see http://stackoverflow.com/questions/7701097 */
public class PixelView extends JPanel {

    private static final int SIZE = 20;
    private static final int SCALE = 16;
    private BufferedImage img;

    public PixelView(Color fill) {
        this.setBackground(Color.white);
        this.setPreferredSize(new Dimension(SCALE * SIZE, SCALE * SIZE));
        img = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = img.createGraphics();
        int[] xPoints = {SIZE / 3, (2 * SIZE) / 3, SIZE / 3};
        int[] yPoints = {0, SIZE / 2, SIZE};
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(Color.green);
        g2.drawLine(0, SIZE - 1, SIZE, SIZE - 1);
        g2.drawLine(0, 0, SIZE, 0);
        g2.drawLine(SIZE / 3, 0, SIZE / 3, SIZE);
        g2.drawLine((2 * SIZE / 3), 0, (2 * SIZE / 3), SIZE);
        g2.setColor(Color.black);
        g2.drawPolygon(xPoints, yPoints, xPoints.length);
        g2.setColor(fill);
        g2.fillPolygon(xPoints, yPoints, xPoints.length);
        g2.dispose();
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(img, 0, 0, getWidth(), getHeight(), null);
    }

    private static void display() {
        JFrame f = new JFrame("PixelView");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setLayout(new GridLayout(1, 0));
        f.add(new PixelView(Color.black));
        f.add(new PixelView(Color.red));
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                display();
            }
        });
    }
}