Re: Rendering text more t

From:

"John B. Matthews" <john.b..matthews@THRWHITE.remove-dii-this>

Newsgroups:

comp.lang.java.gui

Date:

Wed, 27 Apr 2011 15:50:49 GMT

Message-ID:

<nospam-2AED2A.11164622112008@news.motzarella.org>

To: comp.lang.java.gui
In article
<4927bbf2$0$7520$5a62ac22@per-qv1-newsreader-01.iinet.net.au>,
"Qu0ll" <Qu0llSixFour@gmail.com> wrote:

Why is it that the text appears smudged when you use drawString() to render
the same text in the same position twice or more without clearing the
background? I would have thought that it's the exact same pixels affected
and therefore the text would still look as sharp as if it were only rendered
once. I am suspecting it has something to do with antialiasing. Correct?

I am unable to reproduce this at any scale on Mac OS 10.5 Java 1.5.

<code>
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class TransTest extends JFrame {

    private class MyPanel extends JPanel {

        @Override
        public void paintComponent(final Graphics g) {
            final Graphics2D g2d = (Graphics2D)g;
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
            final double scaleX = this.getWidth() / 100.0;
            final double scaleY = this.getHeight() / 100.0;
            final BasicStroke stroke = new BasicStroke(4f,
                BasicStroke.CAP_ROUND , BasicStroke.JOIN_ROUND);
            g2d.setStroke(stroke);
            final AffineTransform at = new AffineTransform(
                AffineTransform.getScaleInstance(scaleX, scaleY));
            at.translate(10, 10);
            g2d.transform(at);
            g2d.setColor(new Color(128, 64, 32));
            g2d.drawRect(0, 0, 80, 80);
            line(g2d, 0, 0, 80, 80);
            line(g2d, 0, 40, 80, 40);
            line(g2d, 40, 0, 40, 80);
            line(g2d, 0, 0, 80, 80);
            line(g2d, 80, 0, 0, 80);
            g2d.setColor(Color.darkGray);
            g2d.drawString("Test/", 5, 65);
            g2d.drawString("Test\\", 5, 65);
        }
    }

    private void line(Graphics2D g2, int x1, int y1, int x2, int y2) {
        Color color = g2.getColor();
        g2.setColor(color.brighter());
        g2.drawLine(x1, y1, x2, y2);
    }

    public TransTest() {
        this.setLayout(new BorderLayout());
        final MyPanel panel = new MyPanel();
        this.add(panel, BorderLayout.CENTER);
        panel.setBackground(Color.WHITE);
        this.pack();
        this.setSize(543, 567);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLocationRelativeTo(null);
    }

    public static void main(final String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TransTest().setVisible(true);
            }
        });
    }
}
</code>

--
John B. Matthews
trashgod at gmail dot com
http://home.roadrunner.com/~jbmatthews/

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