PatternView.java

import java.awt.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class PatternView extends JPanel {

 int frame_height;
 int frame_width;
 int circles = 3;

 PatternView(int frame_width, int frame_height) {
 this.frame_height = frame_height;
 this.frame_width = frame_width;

 // Frame
 JFrame frame = new JFrame();
 frame.setSize(frame_width, frame_height);
 frame.setDefaultCloseOperation(3);
 frame.add(this);
 this.setBackground(new Color(229, 222, 206, 255));

 // Slider
 JSlider slider = new JSlider(JSlider.VERTICAL, 0, 12, 3);
 slider.setBackground(null);
 slider.setPaintLabels(false);
 slider.addChangeListener(new ChangeListener() {
 @Override
 public void stateChanged(ChangeEvent e) {
 circles = Integer.valueOf(((JSlider) (e.getSource())).getValue());
 repaint();
 }
 });
 slider.setMajorTickSpacing(1);
 slider.setPaintTicks(true);

 // Layout
 this.setLayout(new BorderLayout());
 this.add(slider, BorderLayout.EAST);

 frame.setVisible(true);
 }

 public void paint(Graphics g) {

 super.paint(g);

 // Pen properties
 Graphics2D g2 = (Graphics2D) g;
 g2.translate(this.getWidth() / 2, this.getHeight() / 2);
 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
 BasicStroke stroke = new BasicStroke(10);
 g2.setStroke(stroke);

 // Center circle parametres
 int center_diameter = 20;
 int center_x = -center_diameter / 2;
 int center_y = center_x;

 //Drawing
 for (int i = 0; i < circles; i++) {
 Pattern.drawPattern(center_x, center_y, center_diameter, i, g2);
 }
 }
}