package cz.frantovo.obrazkovyApplet;

 import java.awt.Color;

 import java.awt.Graphics;

 import java.awt.Graphics2D;

 import java.awt.event.MouseEvent;

 import java.awt.event.MouseListener;

 import java.awt.event.MouseMotionListener;

 import java.awt.image.BufferedImage;

 import java.io.BufferedReader;

 import java.io.InputStreamReader;

 import java.io.OutputStream;

 import java.net.URL;

 import java.net.URLConnection;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javax.imageio.ImageIO;

 import javax.swing.UIManager;

 import javax.swing.UIManager.LookAndFeelInfo;

 public class ObrazkovyApplet extends javax.swing.JApplet implements MouseMotionListener, MouseListener {

 	private static final Logger log = Logger.getLogger(ObrazkovyApplet.class.getSimpleName());

 	private static final String CILOVE_URL = "http://vm.frantovo.cz/temp/applet/";

 	private int stareX;

 	private int stareY;

 	private boolean kresli;

 	private Graphics g;

 	private Graphics2D vystupniGrafika;

 	private BufferedImage obrazek;

 	private void odesliData() {

 		try {

 			URL url = new URL(CILOVE_URL);

 			URLConnection spojeni = url.openConnection();

 			spojeni.setDoOutput(true);

 			spojeni.connect();

 			OutputStream os = spojeni.getOutputStream();

 			ImageIO.write(obrazek, "png", os);

 			os.flush();

 			os.close();

 			BufferedReader r = new BufferedReader(new InputStreamReader(spojeni.getInputStream()));

 			vypisStav(r.readLine());

 			r.close();

 			smazGrafiku();

 		} catch (Exception e) {

 			vypisStav("odeslání selhalo: " + e.getMessage());

 			log.log(Level.SEVERE, "Nepodařilo se odeslat data", e);

 		}

 	}

 	private void smazGrafiku() {

 		getVystupniGrafika().clearRect(0, 0, platno.getWidth(), platno.getHeight());

 		g.clearRect(0, 0, platno.getWidth(), platno.getHeight());

 	}

 	public void mouseDragged(MouseEvent e) {

 		int x = e.getX();

 		int y = e.getY();

 		if (kresli) {

 			vypisStav("kreslím: " + stareX + "x" + stareY + "→" + x + "x" + y);

 			g = platno.getGraphics();

 			g.setColor(Color.BLUE);

 			g.drawLine(stareX, stareY, x, y);

 			platno.pa

 			getVystupniGrafika().drawLine(stareX, stareY, x, y);

 		}

 		stareX = x;

 		stareY = y;

 	}

 	public void mousePressed(MouseEvent e) {

 		stareX = e.getX();

 		stareY = e.getY();

 		kresli = true;

 	}

 	public void mouseReleased(MouseEvent e) {

 		kresli = false;

 	}

 	public void mouseMoved(MouseEvent e) {

 	}

 	public void mouseClicked(MouseEvent e) {

 	}

 	public void mouseEntered(MouseEvent e) {

 	}

 	public void mouseExited(MouseEvent e) {

 		kresli = false;

 	}

 	private Graphics2D getVystupniGrafika() {

 		if (obrazek == null) {

 			obrazek = new BufferedImage(platno.getWidth(), platno.getHeight(), BufferedImage.TYPE_INT_RGB);

 		}

 		if (vystupniGrafika == null) {

 			vystupniGrafika = obrazek.createGraphics();

 			vystupniGrafika.setBackground(Color.WHITE);

 			vystupniGrafika.setColor(Color.BLUE);

 			vystupniGrafika.clearRect(0, 0, platno.getWidth(), platno.getHeight());

 		}

 		return vystupniGrafika;

 	}

 	@Override

 	public void init() {

 		/** Lepší vzhled – LaF */

 		try {

 			for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {

 				if ("Nimbus".equals(info.getName())) {

 					UIManager.setLookAndFeel(info.getClassName());

 					break;

 				}

 			}

 		} catch (Exception e) {

 		}

 		/** Spuštění appletu */

 		try {

 			java.awt.EventQueue.invokeAndWait(new Runnable() {

 				public void run() {

 					initComponents();

 				}

 			});

 		} catch (Exception e) {

 			log.log(Level.SEVERE, "Chyba appletu:", e);

 		}

 		/** Nastavení plátna */

 		platno.addMouseMotionListener(ObrazkovyApplet.this);

 		platno.addMouseListener(ObrazkovyApplet.this);

 		log.log(Level.INFO, "plátno nastaveno");

 	}

 	@SuppressWarnings("unchecked")

     // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents

     private void initComponents() {

         odeslat = new javax.swing.JButton();

         stavovyRadek = new javax.swing.JLabel();

         platno = new javax.swing.JPanel();

         odeslat.setText("Odeslat na server");

         odeslat.addActionListener(new java.awt.event.ActionListener() {

             public void actionPerformed(java.awt.event.ActionEvent evt) {

                 odeslatActionPerformed(evt);

             }

         });

         stavovyRadek.setText(" ");

         platno.setDoubleBuffered(true);

         javax.swing.GroupLayout platnoLayout = new javax.swing.GroupLayout(platno);

         platno.setLayout(platnoLayout);

         platnoLayout.setHorizontalGroup(

             platnoLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

             .addGap(0, 388, Short.MAX_VALUE)

         );

         platnoLayout.setVerticalGroup(

             platnoLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

             .addGap(0, 255, Short.MAX_VALUE)

         );

         javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

         getContentPane().setLayout(layout);

         layout.setHorizontalGroup(

             layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

             .addGroup(layout.createSequentialGroup()

                 .addContainerGap()

                 .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                     .addComponent(platno, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

                     .addGroup(layout.createSequentialGroup()

                         .addComponent(stavovyRadek, javax.swing.GroupLayout.DEFAULT_SIZE, 243, Short.MAX_VALUE)

                         .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

                         .addComponent(odeslat)))

                 .addContainerGap())

         );

         layout.setVerticalGroup(

             layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

             .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

                 .addContainerGap()

                 .addComponent(platno, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

                 .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

                 .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                     .addComponent(odeslat)

                     .addComponent(stavovyRadek))

                 .addContainerGap())

         );

     }// </editor-fold>//GEN-END:initComponents

 	private void odeslatActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_odeslatActionPerformed

 		odesliData();

 	}//GEN-LAST:event_odeslatActionPerformed

 	private void vypisStav(String text) {

 		stavovyRadek.setText(text);

 	}

     // Variables declaration - do not modify//GEN-BEGIN:variables

     private javax.swing.JButton odeslat;

     private javax.swing.JPanel platno;

     private javax.swing.JLabel stavovyRadek;

     // End of variables declaration//GEN-END:variables

 }