CircleTrip.java

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import javax.imageio.ImageIO;

/**
 * Creates an image with circle of lines.
 * @author aNNiMON
 */
public class CircleTrip {
    
    public static void main(String[] args) {
        new CircleTrip(1000, 1000).process(30);
    }

    private static final String FORMAT_NAME = "png";
    
    private final ArrayList<Point> list;
    private final BufferedImage image;
    
    public CircleTrip(int width, int height) {
        list = new ArrayList<Point>();
        image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    }
    
    private void process(int angles) {
        double anglePerPoint = 360d / angles;
        double i = 0;
        int cx = getWidth() / 2;
        int cy = getHeight() / 2;
        final int radius = Math.min(cx, cy);
        while (i < 360) {
            double radAngle = Math.toRadians(i);
            list.add(new Point((int) (cx + Math.cos(radAngle) * radius),
                               (int) (cy + Math.sin(radAngle) * radius)));
            i += anglePerPoint;
        }
        
        paint(image.getGraphics());
        saveImage(image, "image_" + angles);
    }
    
    private void paint(Graphics g) {
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, getWidth(), getHeight());
        g.setColor(Color.BLACK);
        final int size = list.size();
        for (int i = 0; i < size; i++) {
            final int x1 = list.get(i).x;
            final int y1 = list.get(i).y;
            for (int j = 0; j < size; j++) {
                int x2 = list.get(j).x;
                int y2 = list.get(j).y;
                g.drawLine(x1, y1, x2, y2);
            }
        }
    }
    
    private void saveImage(BufferedImage image, String name) {
        try {
            File out = new File(name + '.' + FORMAT_NAME);
            out.createNewFile();
            ImageIO.write(image, FORMAT_NAME, out);
        } catch (IOException ex) { }
    }

    private int getWidth() {
        return image.getWidth();
    }

    private int getHeight() {
        return image.getHeight();
    }
}