CURVAS

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

public class CubicCurve2D1 extends JFrame {
  private CubicCurve2D Shape1;
  private CubicCurve2D Shape2;
  private float X1;
  private float Y1;
  private float X2;
  private float Y2;
  private float CX1;
  private float CY1;
  private float CX2;
  private float CY2;
  private double DX1;
  private double DY1;
  private double DX2;
  private double DY2;
  private double DCX1;
  private double DCY1;
  private double DCX2;
  private double DCY2;

  public CubicCurve2D1 () {
    X1 = 10.F;
    Y1 = 20.F;
    X2 = 150.F;
    Y2 = 130.F;
    CX1 = 20.F;
    CY1 = 90.F;
    CX2 = 140.F;
    CY2 = 100.F;
    DX1 = 160.;
    DY1 = 20.;
    DX2 = 230.;
    DY2 = 40.;
    DCX1 = 160.;
    DCY1 = 120.;
    DCX2 = 240.;
    DCY2 = 90.;
    Shape1 = new CubicCurve2D.Float (X1, Y1, CX1, CY1, CX2, CY2, X2, Y2);
    Shape2 = new CubicCurve2D.Double ();
    Shape2.setCurve (DX1, DY1, DCX1, DCY1, DCX2, DCY2, DX2, DY2);
  }

  public void paint (Graphics g) {
    Graphics2D g2D;

    g2D = (Graphics2D) g;

    g2D.setColor (Color.cyan);
    g2D.drawLine ((int)X1, (int)Y1, (int)CX1, (int)CY1);
    g2D.drawLine ((int)X2, (int)Y2, (int)CX2, (int)CY2);
    g2D.drawLine ((int)DX1, (int)DY1, (int)DCX1, (int)DCY1);
    g2D.drawLine ((int)DX2, (int)DY2, (int)DCX2, (int)DCY2);

    g2D.setColor (Color.black);
    g2D.draw (Shape1);
    g2D.draw (Shape2);
  }

}