Re: [JAVA2D] area.subtract and antialias problem

[java2d]

Hi davood,

You may fill the gap by a draw operation that slightly overlaps the inner and 
outer area.

[code]
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class AreaTest extends JComponent {

    private static final long serialVersionUID = 1L;

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

            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new AreaTest(false), BorderLayout.LINE_START);
                frame.add(new AreaTest(true), BorderLayout.LINE_END);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    private final boolean antiAlias;

    public AreaTest(boolean antiAlias) {
        this.antiAlias = antiAlias;
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(270, 270);
    }

    private void drawTest(Graphics2D g2) {
        System.out.println("Drawing " + getBounds());
        g2.setColor(Color.WHITE);

        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                antiAlias ? RenderingHints.VALUE_ANTIALIAS_ON
                        : RenderingHints.VALUE_ANTIALIAS_OFF);

        g2.fillRect(0, 0, getWidth(), getHeight());

        Ellipse2D shape1 = new Ellipse2D.Double(50, 85, 150, 60);

        Shape shape3 = new Rectangle2D.Double(10, 10, 250, 250);
        Area area = new Area(shape3);
        area.subtract(new Area(shape1));

        g2.setColor(new Color(86 / 256f, 114 / 256f, 142 / 256f, 1f));
        g2.fill(area);

        g2.setColor(new Color(86 / 256f, 144 / 256f, 182 / 256f, 1f));
        g2.fill(shape1);

        // fill the white gap by overlapping it
        g2.setStroke(new BasicStroke(2f));
        g2.draw(shape1);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        drawTest((Graphics2D) g);
    }

}
[/code]

Piet
[Message sent by forum member 'pietblok' (pietblok)]

http://forums.java.net/jive/thread.jspa?messageID=316968

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