TUGAS GRAFKOM 3 (MEMBUAT BANGUN KURVA DERAJAT 1,2,3 SPLINE DAN TITIK KONTROL )

di atas merupakan tampilan dari kurva derajat 1, spline, kurva derajat 3 dan kurva derajat 3.
adapun Source Codenya adalah sebagai berikut :

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.CubicCurve2D;
import java.awt.geom.Line2D;
import java.awt.geom.QuadCurve2D;
import javax.swing.JPanel;


public class grafkom3 extends javax.swing.JFrame {

    /** Creates new form grafika_3 */
    public grafkom3() {
        initComponents();
    }

  
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                         
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jScrollPane1 = new javax.swing.JScrollPane();
        bt_derajat_1 = new javax.swing.JButton();
        bt_derajat_2 = new javax.swing.JButton();
        bt_derajat_3 = new javax.swing.JButton();
        bt_spline = new javax.swing.JButton();
        bt_kontrol = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jPanel1.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0), 1, true));

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 325, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 305, Short.MAX_VALUE)
        );

        bt_derajat_1.setText("Derajat 1");
        bt_derajat_1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bt_derajat_1ActionPerformed(evt);
            }
        });

        bt_derajat_2.setText("Derajat 2");
        bt_derajat_2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bt_derajat_2ActionPerformed(evt);
            }
        });

        bt_derajat_3.setText("Derajat 3");
        bt_derajat_3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bt_derajat_3ActionPerformed(evt);
            }
        });

        bt_spline.setText("Spline");
        bt_spline.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bt_splineActionPerformed(evt);
            }
        });

        bt_kontrol.setText("Titik Kontrol");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(28, 28, 28)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 24, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addComponent(bt_kontrol, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(bt_spline, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(bt_derajat_3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(bt_derajat_2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(bt_derajat_1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGap(41, 41, 41))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(48, 48, 48)
                        .addComponent(bt_derajat_1)
                        .addGap(18, 18, 18)
                        .addComponent(bt_derajat_2)
                        .addGap(18, 18, 18)
                        .addComponent(bt_derajat_3)
                        .addGap(18, 18, 18)
                        .addComponent(bt_spline)
                        .addGap(18, 18, 18)
                        .addComponent(bt_kontrol))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(24, 24, 24)
                        .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(20, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                       

    private void bt_derajat_1ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
        jPanel1 = new Derajad_1();
        jPanel1.repaint();
        jScrollPane1.setViewportView(jPanel1);
        jPanel1.setAutoscrolls(true);
    }                                           

    private void bt_derajat_2ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
        jPanel1 = new Derajad_2();
        jPanel1.repaint();
        jScrollPane1.setViewportView(jPanel1);
        jPanel1.setAutoscrolls(true);
    }                                           

    private void bt_derajat_3ActionPerformed(java.awt.event.ActionEvent evt) {                                            
        // TODO add your handling code here:
        jPanel1 = new Derajad_3();
        jPanel1.repaint();
        jScrollPane1.setViewportView(jPanel1);
        jPanel1.setAutoscrolls(true);

    }                                           

    private void bt_splineActionPerformed(java.awt.event.ActionEvent evt) {                                         
        jPanel1 = new spline();
        jPanel1.repaint();
        jScrollPane1.setViewportView(jPanel1);
        jPanel1.setAutoscrolls(true);
    }                                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new grafkom3().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                    
    private javax.swing.JButton bt_derajat_1;
    private javax.swing.JButton bt_derajat_2;
    private javax.swing.JButton bt_derajat_3;
    private javax.swing.JButton bt_kontrol;
    private javax.swing.JButton bt_spline;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration                  
}

class Derajad_1 extends JPanel {

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g.create();

        Shape lurus = new Line2D.Double(200,250, 300, 50);
        g2.draw(lurus);
    }
}

class Derajad_2 extends JPanel {

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g.create();

        Shape kuadrat = new QuadCurve2D.Double(100,150,175,75,300,150);
        g2.draw(kuadrat);
    }
}

class Derajad_3 extends JPanel {

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g.create();

        Shape kubik = new CubicCurve2D.Double(50,150,150, 100,200,250,300,150);
        g2.draw(kubik);

    }
}

class spline extends JPanel {

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g.create();

       g2.draw(new CubicCurve2D.Double(30, 140, 50, 10, 120, 180, 190, 30));
       g2.draw(new QuadCurve2D.Double(190, 30, 220, 10, 230, 60));

    }
}