Name: gsC80088 Date: 02/10/99


BasicStroke with width=0 should draw lines as thin as possible for the device.
The current behaviour (in JDK 1.2fcs) work well in most case. But if we use
an AffineTransform with a high ratio scaleX/scaleY, lines become to width. The source code below illustrate the problem:


import java.awt.*;
import javax.swing.*;

public class Test extends JFrame
{
    private final Shape shape;
    private final double scaleX,scaleY;

    public Test(double width, double height)
    {
        super("width/height=3D"+width/height);
        shape =3D new Ellipse2D.Double(0.25*width, 0.25*height, width, height);
        scaleX =3D 200/width;
        scaleY =3D 200/height;
        setSize(300,300);
        show();
    }

    public void paint(Graphics g)
    {
        final Graphics2D g2=3D(Graphics2D) g;
        g2.scale(scaleX,scaleY);
        g2.setStroke(new BasicStroke(0));
        g2.draw(shape);
    }

    public static void main(String[] args)
    {
        new Test(200, 200);
        new Test(1, 10000);
        new Test(10000, 1);
        new Test(0.01, 10000);
        new Test(10000, 0.01);
    }
}




A ratio of 1E+6 in "real life" may seem exaggerate, but it is not. A typical
example is time series. In a three-months temperature measurement, we have a
range of almost 1E+10 milliseconds on the X axis (because Date objects measure
time in milliseconds...), but a range of only a few degrees on the Y axis.
We got trouble when we try to plot the graph of a time series with such scales.

(Review ID: 53954)
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