Draw a grid(different)

Hi,
I am trying to draw a circular grid, i.e. like a dartboard, where each ring is split into a number of parts.
So far I have managed to do that by drawing an image of the board. This creates other problems like reading mouse clicks,scaling, and placing components in correct coordinates.
I can provide more info. Thank you

This kinda solves my problem
for(int i = 0; i < 8; i++)
               g2d.draw(new Ellipse2D.Double(i*45, i*45,
                    getWidth()-(2*i*45),
                    getHeight()-(2*i*45)));
for(int i = 0; i < 24; i++)
               double temp = Math.toRadians(i*15);
               Line2D line = new Line2D.Double(getWidth()/2,getHeight()/2, getWidth()/2,0);
               g2d.draw(line);
               at.rotate(Math.toRadians(15),(getWidth()/2), (getHeight()/2));
               g2d.setTransform(at);
}This draws the grid. Now if I want to place something or read a click my best bet is:
x = a + r cos(t)
y = b + r cos(t)
So a code of this sort:
Point point = new Point((int)(center.x+(getWidth()/2)*Math.cos(temp)),
                         (int)(center.y+(getHeight()/2)*Math.sin(temp)));Will produce results slightly different from the actual drawing.
Thanks again for the help

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