FULL PRODUCT VERSION :


ADDITIONAL OS VERSION INFORMATION :
Linux 3.13.0-85-generic #129-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
When drawing (stroking) 1px line on a sub-pixel coordinates in Java 8, its coordinates are rounded up, but in Java 7 they were rounded down. Only affects 1px lines.

Tried on early 1.8 version, 8u60 and 8u77.
Doesn't reproduce on Windows/Mac.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
http://i.stack.imgur.com/6egcI.png
ACTUAL -
http://i.stack.imgur.com/pNJlB.png

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import static java.awt.BasicStroke.*;

import java.awt.*;
import java.awt.geom.*;

import javax.swing.*;

public class TestCase
{
    public static void main(String[] args)
    {
        JFrame frame = new JFrame("Test case");
        frame.setSize(115, 115);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        frame.getContentPane().add(new TestPanel());

        frame.setVisible(true);
    }

    private static class TestPanel extends JPanel
    {
        TestPanel()
        {
            setOpaque(true);
        }

        @Override
        protected void paintComponent(Graphics g)
        {
            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(Color.white);
            g2.fill(getBounds());

            Rectangle2D rect = new Rectangle2D.Double();
            Color background = new Color(0, 255, 255);
            Color border = new Color(255, 0, 0, 128);
            Stroke STROKE_1PX = new BasicStroke(1, CAP_SQUARE, JOIN_MITER);
            Stroke STROKE_2PX = new BasicStroke(2, CAP_SQUARE, JOIN_MITER);
            Stroke STROKE_3PX = new BasicStroke(3, CAP_SQUARE, JOIN_MITER);
            g2.translate(10, 10);

            /**
             * Filling and stroking by original coordinates
             */
            rect.setRect(0, 0, 25, 25);
            g2.setColor(background);
            g2.fill(rect);
            g2.setColor(border);
            g2.setStroke(STROKE_1PX);
            g2.draw(rect);
            g2.translate(0, 35);
            g2.setColor(background);
            g2.fill(rect);
            g2.setColor(border);
            g2.setStroke(STROKE_2PX);
            g2.draw(rect);
            g2.translate(0, 35);
            g2.setColor(background);
            g2.fill(rect);
            g2.setColor(border);
            g2.setStroke(STROKE_3PX);
            g2.draw(rect);

            /**
             * Stroking is shrunk to be inside the filling rect
             */
            g2.translate(35, -70);
            rect.setRect(0, 0, 25, 25);
            g2.setColor(background);
            g2.fill(rect);
            rect.setRect(0.5, 0.5, 24, 24);
            g2.setColor(border);
            g2.setStroke(STROKE_1PX);
            g2.draw(rect);
            g2.translate(0, 35);
            rect.setRect(0, 0, 25, 25);
            g2.setColor(background);
            g2.fill(rect);
            rect.setRect(1, 1, 23, 23);
            g2.setColor(border);
            g2.setStroke(STROKE_2PX);
            g2.draw(rect);
            g2.translate(0, 35);
            rect.setRect(0, 0, 25, 25);
            g2.setColor(background);
            g2.fill(rect);
            rect.setRect(1.5, 1.5, 22, 22);
            g2.setColor(border);
            g2.setStroke(STROKE_3PX);
            g2.draw(rect);

            /**
             * Filling rect is additionally shrunk and centered
             */
            g2.translate(35, -70);
            rect.setRect(0.5, 0.5, 24, 24);
            g2.setColor(background);
            g2.fill(rect);
            g2.setColor(border);
            g2.setStroke(STROKE_1PX);
            g2.draw(rect);
            g2.translate(0, 35);
            rect.setRect(1, 1, 23, 23);
            g2.setColor(background);
            g2.fill(rect);
            g2.setColor(border);
            g2.setStroke(STROKE_2PX);
            g2.draw(rect);
            g2.translate(0, 35);
            rect.setRect(1.5, 1.5, 22, 22);
            g2.setColor(background);
            g2.fill(rect);
            g2.setColor(border);
            g2.setStroke(STROKE_3PX);
            g2.draw(rect);
        }
    }
}
---------- END SOURCE ----------