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

public class CurveApplet extends JApplet
{
  // Initialize the applet
  public void init()
  {
    pane = new CurvePane();                   // Create pane containing curves
    Container content = getContentPane();     // Get the content pane

    // Add the pane displaying the curves to the content pane for the applet
    content.add(pane);                 // BorderLayout.CENTER is default position
  }

  // Class defining a pane on which to draw
  class CurvePane extends JComponent
  {
    // Constructor
    public CurvePane()
    {
      quadCurve = new QuadCurve2D.Double(                // Create quadratic curve
                       startQ.x, startQ.y,               // Segment start point
                       control.x, control.y,             // Control point
                       endQ.x, endQ.y);                  // Segment end point

      cubicCurve = new CubicCurve2D.Double(              // Create cubic curve
                       startC.x, startC.y,               // Segment start point
                       controlStart.x, controlStart.y,   // Control point for start
                       controlEnd.x, controlEnd.y,       // Control point for end
                           endC.x, endC.y);              // Segment end point
    }
    public void paint(Graphics g)
    {
      Graphics2D g2D = (Graphics2D)g;                    // Get a 2D device context

      // Draw the curves
      g2D.setPaint(Color.blue);
      g2D.draw(quadCurve);
      g2D.draw(cubicCurve);
    }
  }

  // Points for quadratic curve
  Point2D.Double startQ = new Point2D.Double(50, 150);         // Start point
  Point2D.Double endQ = new Point2D.Double(150, 150);          // End point
  Point2D.Double control = new Point2D.Double(80, 100);        // Control point

  // Points for cubic curve
  Point2D.Double startC = new Point2D.Double(50, 300);         // Start point
  Point2D.Double endC = new Point2D.Double(150, 300);          // End point
  Point2D.Double controlStart = new Point2D.Double(80, 250);   // 1st control point
  Point2D.Double controlEnd = new Point2D.Double(160, 250);    // 2nd control point

  QuadCurve2D.Double quadCurve;                        // Quadratic curve
  CubicCurve2D.Double cubicCurve;                      // Cubic curve
  CurvePane pane = new CurvePane();                    // Pane to contain curves
}