Новичок
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Сообщений: 3
Регистрация: 23.9.2012
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На приложении висит кнопка для загрузки картинки,на кнопке событие описано так: | Код |
private void loadImageMouseClicked(MouseEvent evt){
String fileToLoad = null;
BufferedImage imgToLoad = null;
JFileChooser chooser = new JFileChooser();
chooser.setDialogTitle("Select File To Load");
int returnVal = chooser.showDialog(drawingPanel, "Select file");
if (returnVal == JFileChooser.APPROVE_OPTION) {
fileToLoad = chooser.getSelectedFile().toString();
}
Graphics2D graph = (Graphics2D) drawingPanel.getGraphics();
try{
imgToLoad=ImageIO.read(new File(fileToLoad));
}catch (IOException excp){
excp.printStackTrace();
}
graph.drawImage(imgToLoad, null, 150,50);
}
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Проблема в том что на панеле ничего не отображается. Вот весь код приложения: | Код |
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package javalab6;
import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Calendar;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.*;
/**
*
* @author Administrator
*/
public class JavaLab6 extends javax.swing.JFrame {
final static float dash1[] = {10.0f};
final static BasicStroke dashed =
new BasicStroke(1.0f,
BasicStroke.CAP_BUTT,
BasicStroke.JOIN_MITER,
10.0f, dash1, 0.0f);
/**
* Creates new form NewJFrame
*/
public JavaLab6() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
drawingPanel = new javax.swing.JPanel();
drawRectangle = new javax.swing.JButton();
drawLine = new javax.swing.JButton();
drawEllipse = new javax.swing.JButton();
drawFilledRectangle = new javax.swing.JButton();
drawFilledLine = new JButton();
drawFilledEllipse = new JButton();
saveImageButton = new JButton();
loadImageButton = new JButton();
imageLabel = new JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(imageLabel);
imageLabel.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(41, 41, 41)
.addComponent(imageLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 189, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(35, 35, 35)
.addComponent(imageLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 99, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(82, Short.MAX_VALUE))
);
drawRectangle.setText("Draw Rectangle");
drawRectangle.setName("drawRectangle"); // NOI18N
drawRectangle.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
drawRectangleMouseClicked(evt);
}
});
drawLine.setText("Draw Line");
drawLine.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
drawLineMouseClicked(evt);
}
});
drawEllipse.setText("Draw Ellipse");
drawEllipse.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent evt){
drawEllipseMouseClicked(evt);
}
});
drawFilledRectangle.setText("Draw Filled Rectangle");
drawFilledRectangle.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent evt){
drawFilledRectangleMouseClicked(evt);
}
});
drawFilledLine.setText("Draw Filled Line");
drawFilledLine.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent evt){
drawFilledLineMouseClicked(evt);
}
});
drawFilledEllipse.setText("Draw Filled Ellipse");
drawFilledEllipse.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent evt){
drawFilledEllipseMouseClicked(evt);
}
});
saveImageButton.setText("Save Image");
saveImageButton.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent evt){
saveImageMouseClicked(evt);
}
});
loadImageButton.setText("Load Image");
loadImageButton.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent evt){
loadImageMouseClicked(evt);
}
});
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(drawingPanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(saveImageButton)
.addGap(18,18,18)
.addComponent(loadImageButton)
.addGap(18,18,18)
.addComponent(drawRectangle)
.addGap(18, 18, 18)
.addComponent(drawLine)
.addGap(18, 18, 18)
.addComponent(drawEllipse)
.addGap(18, 18, 18)
.addComponent(drawFilledRectangle)
.addGap(18,18,18)
.addComponent(drawFilledLine)
.addGap(18,18,18)
.addComponent(drawFilledEllipse)
.addGap(0, 0, Short.MAX_VALUE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(9, 9, 9)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(drawRectangle)
.addComponent(drawLine)
.addComponent(saveImageButton)
.addComponent(loadImageButton)
.addComponent(drawEllipse)
.addComponent(drawFilledRectangle)
.addComponent(drawFilledLine)
.addComponent(drawFilledEllipse))
.addGap(58, 58, 58)
.addComponent(drawingPanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void drawRectangleMouseClicked(java.awt.event.MouseEvent evt) {
figureName = "Rectangle";
buff = new BufferedImage(400, 300, BufferedImage.TYPE_3BYTE_BGR);
Graphics graph = drawingPanel.getGraphics();
graph.clearRect(0 ,0, 1000,1000);
graph.drawRect(150, 50, 100, 100);
Graphics savingGraph = buff.getGraphics();
savingGraph.drawRect(150, 50, 100, 100);
graph.dispose();
savingGraph.dispose();
}
private void drawLineMouseClicked(MouseEvent evt){
figureName = "Line";
buff = new BufferedImage(400, 300, BufferedImage.TYPE_3BYTE_BGR);
Graphics graph = drawingPanel.getGraphics();
graph.clearRect(0 ,0, 1000,1000);
graph.drawLine(150, 50, 100, 100);
Graphics savingGraph = buff.getGraphics();
savingGraph.drawLine(150, 50, 100, 100);
graph.dispose();
savingGraph.dispose();
}
private void drawEllipseMouseClicked(MouseEvent evt){
figureName = "Ellipse";
buff = new BufferedImage(400, 300, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D graph = (Graphics2D) drawingPanel.getGraphics();
graph.clearRect(0, 0, 1000, 1000);
graph.draw(new Ellipse2D.Double(150,50,100,100));
Graphics2D savingGraph =(Graphics2D) buff.getGraphics();
savingGraph.draw(new Ellipse2D.Double(150,50,100,100));
graph.dispose();
savingGraph.dispose();
}
private void drawFilledRectangleMouseClicked(MouseEvent evt){
figureName = "FilledRectangle";
buff=new BufferedImage(400, 300, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D graph = (Graphics2D) drawingPanel.getGraphics();
graph.clearRect(0, 0, 1000, 1000);
graph.setPaint(Color.MAGENTA);
graph.fill(new Rectangle2D.Double(150, 50, 100, 100));
Graphics2D savingGraph = (Graphics2D)buff.getGraphics();
savingGraph.setPaint(Color.MAGENTA);
savingGraph.fill(new Rectangle2D.Double(150, 50, 100, 100));
graph.dispose();
savingGraph.dispose();
}
private void drawFilledLineMouseClicked(MouseEvent evt){
figureName = "FilledLine";
buff = new BufferedImage(400, 300, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D graph = (Graphics2D) drawingPanel.getGraphics();
graph.clearRect(0, 0, 1000, 1000);
//graph.setStroke(dashed);
graph.setColor(Color.MAGENTA);
graph.draw(new Line2D.Double(150, 50, 100, 100));
Graphics2D savingGraph = (Graphics2D)buff.getGraphics();
savingGraph.setColor(Color.MAGENTA);
savingGraph.draw(new Line2D.Double(150, 50, 100, 100));
graph.dispose();
savingGraph.dispose();
}
private void drawFilledEllipseMouseClicked(MouseEvent evt){
figureName = "FilledEllipse";
buff = new BufferedImage(400, 300, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D graph = (Graphics2D) drawingPanel.getGraphics();
graph.clearRect(0, 0, 1000, 1000);
graph.setPaint(Color.MAGENTA);
graph.fill(new Ellipse2D.Double(150,50,100,100));
Graphics2D savingGraph = (Graphics2D)buff.getGraphics();
savingGraph.setColor(Color.MAGENTA);
savingGraph.fill(new Ellipse2D.Double(150,50,100,100));
graph.dispose();
}
private void saveImageMouseClicked(MouseEvent evt){
String myFile = null;
JFileChooser chooser = new JFileChooser();
chooser.setDialogTitle("Select target directory");
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int returnVal = chooser.showDialog(drawingPanel, "Select dir");
if (returnVal == JFileChooser.APPROVE_OPTION) {
myFile = chooser.getSelectedFile().toString();
}
createJPEGFile(myFile);
}
private void loadImageMouseClicked(MouseEvent evt){
String fileToLoad = null;
imgToLoad = null;
JFileChooser chooser = new JFileChooser();
chooser.setDialogTitle("Select File To Load");
int returnVal = chooser.showDialog(drawingPanel, "Select file");
if (returnVal == JFileChooser.APPROVE_OPTION) {
fileToLoad = chooser.getSelectedFile().toString();
}
Graphics2D graph = (Graphics2D) drawingPanel.getGraphics();
try{
imgToLoad=ImageIO.read(new File(fileToLoad));
}catch (IOException excp){
excp.printStackTrace();
}
Icon icon = new ImageIcon(fileToLoad);
imageLabel.setIcon(icon);
/*graph.clearRect(0, 0, 1000, 1000);
graph.drawImage(imgToLoad,150,50,null);
graph.dispose();
*/
}
private void createJPEGFile(String outputPath){
/* ByteArrayOutputStream dest = new ByteArrayOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(dest);
JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(buff);
param.setQuality(0.9f, false);
encoder.setJPEGEncodeParam(param);
try {
encoder.encode(buff);
} catch (IOException ex) {
Logger.getLogger(JavaLab6.class.getName()).log(Level.SEVERE, null, ex);
} catch (ImageFormatException ex) {
Logger.getLogger(JavaLab6.class.getName()).log(Level.SEVERE, null, ex);
}
try {
dest.close();
} catch (IOException ex) {
Logger.getLogger(JavaLab6.class.getName()).log(Level.SEVERE, null, ex);
}
byte[] bytes = dest.toByteArray();
ImageIO.write();*/
try{
// File outputFile = new File(outputPath+"\\"+figureName+Calendar.getInstance().getTime()+".png");
long creationTime = System.nanoTime();
String outputFile = outputPath+"\\"+figureName+creationTime+".jpg";
ImageIO.write(buff, "jpg", new File(outputFile));
}catch(IOException e){
e.printStackTrace();
}
}
/**
* @param args the command line arguments
*/
// Variables declaration - do not modify
private javax.swing.JButton drawRectangle;
private javax.swing.JButton drawLine;
private javax.swing.JButton drawEllipse;
private javax.swing.JButton drawFilledRectangle;
private JButton saveImageButton;
private JButton drawFilledLine;
private JButton drawFilledEllipse;
private BufferedImage imgToLoad;
private JButton loadImageButton;
private String figureName;
private BufferedImage buff ;
private JLabel imageLabel;
private javax.swing.JPanel drawingPanel;
// End of variables declaration
public static void main(String[] args) {
// TODO code application logic here
JavaLab6 application = new JavaLab6();
application.setVisible(true);
application.pack();
}
}
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Загрузка картинки на панель 
Загрузка ...
