// GraphicsHelperMethodDemo.java

import java.awt.*;
import javax.swing.*;

class MyGraphics extends JComponent {

  // Here is a helper method that takes the page, and paints
  // a blue background in it.
  public void paintBlueBackground(Graphics page) {
    int width = getWidth();
    int height = getHeight();
    page.setColor(Color.blue);
    page.fillRect(0, 0, width, height);
  }
  
  // This helper method takes a page, an x,y position, and a radius,
  // and fills a circle with that radius at that location.
  public void fillCircle(Graphics page, int x, int y, int radius) {
    page.fillOval(x-radius, y-radius, 2*radius, 2*radius);
  }
  
  // This helper method takes a page, an x,y position, and a radius,
  // and paints a smiley face with that radius at that location.
  // It uses page.drawArc, which you are not yet responsible for.
  public void paintSmileyFace(Graphics page, int x, int y, int radius) {
    page.setColor(Color.yellow);
    fillCircle(page, x, y, radius);
    page.setColor(Color.black);
    fillCircle(page, x-radius/4, y-radius/4, radius/6); // left eye
    fillCircle(page, x+radius/4, y-radius/4, radius/6); // right eye
    setLineThickness(page, 3);
    page.drawArc(x-radius/3, y, radius*2/3, radius/2, 180, 180);
  }
  
  // This helper method sets the line thickness. You are not responsible
  // for how it works!
  public void setLineThickness(Graphics page, int thickness) {
    if (thickness < 0) thickness = 0;
    ((Graphics2D)page).setStroke(new BasicStroke(thickness));
  }

  public void paint(Graphics page) {
    paintBlueBackground(page);
    page.setColor(Color.yellow);
    fillCircle(page, 50, 50, 10);
    page.setColor(Color.green);
    fillCircle(page, 100, 100, 30);
    paintSmileyFace(page, 300, 100, 50);
    paintSmileyFace(page, 300, 300, 100);
  }

  //////////////////////////////////////////////
  ///           END OF YOUR CODE             ///
  ///  (you may ignore all the code below!!! ///
  //////////////////////////////////////////////

  public Dimension getPreferredSize() {
    int initialWidth = 500;
    int initialHeight = 400;
    return new Dimension(initialWidth, initialHeight);
  }

  public static void main(String[] args) {
    JComponent jc = newInstance();
    JFrame frame = new JFrame(jc.getClass().getName());
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel cp = new JPanel();
    cp.setLayout(new BorderLayout());
    cp.add(jc);
    frame.setContentPane(cp);
    frame.pack();
    frame.setVisible(true);
  }

  // Returns an instance of this class as a JComponent.  This is necessary so
  // students can rename this class without changing the "main" method's body.
  public static JComponent newInstance() {
    StackTraceElement[] trace = null;
    try { throw new RuntimeException(); }
    catch (Exception e) { trace = e.getStackTrace(); }
    try { return (JComponent)Class.forName(trace[0].getClassName()).newInstance(); }
    catch (Exception e) { return null; }
  }
}