// A custom panel for displaying dragon curves.
// CS 310, Spring 2008

import javax.swing.JPanel;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Line2D;

class DragonPanel
extends JPanel {

  public 
  DragonPanel(DragonCurve dc) {

    // Create a new panel that displays the given dragon curve.

    super();
    dragonCurve = dc;
    }


  public void
  paintComponent(Graphics g) {

    // Draw using the given graphics context the dragon curve associated with
    // this panel.

    super.paintComponent(g);
    final Graphics2D g2 = (Graphics2D) g;

    final Point2D points [] = dragonCurve.points();
    for (int i = 0; i < points.length - 1; i++)
      g2.draw(new Line2D.Float(points[i], points[i + 1]));
    }

  private final DragonCurve dragonCurve;
  }