circles.java

   public static void main(String[] args) throws IOException {
        final BufferedImage image = new BufferedImage(1024, 1024, BufferedImage.TYPE_INT_ARGB);
        final Graphics graphics = image.getGraphics();

        int center = image.getWidth() / 2;

        int outerRadius = 512;


        int segments = 18;
        int angle = 360 / segments;

        graphics.setColor(Color.BLACK);

        graphics.setFont(graphics.getFont().deriveFont(8.5f));

        for (int i = segments; i > 0; i--) {
            final double cos = Math.cos(Math.toRadians(i*angle));
            final double sin = Math.sin(Math.toRadians(i*angle));

            double x = cos * 100;
            double y = sin * 100;



            double travelX = cos * outerRadius;
            double travelY = sin * outerRadius;

            final double v = (Math.toRadians((i - 1)*angle));
            double nextX = Math.cos(v) * outerRadius;
            double nextY = Math.sin(v) * outerRadius;


            Polygon polygon = new Polygon();

            polygon.addPoint((int) x + center, (int) y + center); // the tip
            polygon.addPoint((int) travelX + center, (int) travelY + center);
            polygon.addPoint((int) nextX + center, (int) nextY + center);


//            image.setRGB((int) x + center, (int) y + center, Color.BLACK.getRGB());


            graphics.setColor(Color.PINK);
            graphics.drawPolygon(polygon.xpoints, polygon.ypoints, polygon.npoints);
            graphics.setColor(Color.BLACK);
            graphics.fillPolygon(polygon);

//            graphics.drawLine((int) x + center, (int) y + center, (int) travelX + center, (int) travelY + center);
//            graphics.drawString("" + (i), (int) x + center, (int) y + center);
//            graphics.drawString("aP " + (i + 1), (int) nextX + center, (int) nextY + center);
//            image.setRGB((int) travelX + center, (int) travelY + center, Color.RED.getRGB());
//            image.setRGB((int) nextX + center, (int) nextY + center, Color.BLUE.getRGB());
        }


//        graphics.dispose();
        ImageIO.write(image, "png", new File("test.png"));


    }