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

public class BallGraphicsView extends JPanel implements SimView {
	private static final long serialVersionUID = 1L;
	
// instance variables
  private SimModel model;  // the SimModel we are viewing
  
  /**
   * Initialize this as a viewer linked to the given model.
   * @param model  The model we are watching
   */
  public BallGraphicsView(SimModel model) {
    this.model = model;
  }
  
  /**
   * React when notified of a change by a model by repainting this view
   */
  public void notifyViewer() {
    repaint();
  }
  
  /**
   * Repaint the simulation by requesting each item to repaint itself
   * @param g the graphics context where the painting should take place
   */
  @Override
  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    
    // clear frame to background color (white, in this case)
    Rectangle bounds = getBounds();
    g.clearRect(0, 0, bounds.width, bounds.height);
    
    java.util.List<SimThing> things = model.getThings();
    for (SimThing thing: things) {
      thing.paintThing(g);
    }
  }
  
}