Using basicStroke to draw the INSIDE of a polygon

hello
i have a polygon that i want to trace the inside of... using:
g2.setStroke( new BasicStroke( 20, //float width,
BasicStroke.CAP_SQUARE, //int cap,
BasicStroke.JOIN_MITER,
1,
new float[] { 12, 12 },
1
g2.draw( myRect );
this code traces the shape "on the line", and since the stroke width is 20 pixels, it is painting both inside and outside of the shape itself.
i would like to trace the inside of the shape. or for that matter, the outside of the shape...
any ideas?
thanks
ERIK!

First draw the shape using g.fill() and a
non-transparent color. Then set an alpha composite
with the rule SRC_IN, and redraw the shape using the
desired stroke. Only the part of the stroke inside
the filled area will be drawn. Use SRC_OUT to draw
outside the shape. If you're drawing on top of
existing graphics, you may have to use a BufferedImage
as a temporary work area to composite the shape and
then draw the image to your graphics context.thanks for the suggestion, although i believe that this will not render the outer edge of the stroke as intended...
what i mean is, where you use the shape itself to mask the stroke, it will leave a not-as-pretty edge as you would get if from an un-masked basic stroke.
thanks for the two suggestions though.

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Using basicStroke to draw the INSIDE of a polygon

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