Can't draw thin lines with Java2D

Question

I'm trying to draw a polygon with a stroke of 1 pixel. Because the entire polygon is scaled by 100, I set the line width to 0.01. For some reason though, the polygon gets drawn with an on-screen line width of what looks to be 100 pixels instead of 1.

I'm using GeneralPath as the polygon shape. Thin lines do get drawn if I use the same approach for drawing Line2D shapes.

g2d.scale(100, 100);
g2d.setStroke(new BasicStroke(0.01f));
g2d.draw(theShape);

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New info: If I remove the setStroke line I correctly get a 2 pixel line, since a BasicStroke of 0.02f was set on the Graphics2D object earlier.

This is the real setStroke line

g.setStroke(new BasicStroke((float) (1f / getRoot().scaleX)));

Answer 1

The Problem coulb be that you are applying the scaling to the complete Graphics2D context. youll have to use an AffineTransform which is set to scale and then apply the transform to the shape only, not the hole context. something like:

AffineTransform trans=new AffineTransform();
trans.setToScale(100,100);
Shape scaledShape=trans.createTransformedShape(theShape);
g2d.draw(scaledShape);

hope that helps..

Answer 2

I don't know why, but it works now.