This program should first open an image, and then allow it to be manipulated via grayscale, scale, and rotate methods (not functional at the moment; disregard it). However, I’m not sure how I can call upon the updated image every time a method is performed. For example, if I grayscale an image, it goes to grayscale. But if I then scale it to a different size, the resulting image is a scaled version of the original image, not a scaled grayscale image. I tried putting in “image2 = image;” to no avail. How can I fix this?
Thanks.
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.image.*;
import javax.imageio.ImageIO;
public class Picture{
JFileChooser fileChooser = new JFileChooser();
final JFrame frame = new JFrame("Edit Image");
Container content;
static BufferedImage image;
BufferedImage image2;
JLabel imageLabel;
public Picture() {
//asks for image file as input
fileChooser.setDialogTitle("Choose an image file to begin:");
fileChooser.showOpenDialog(frame);
File selectedFile = fileChooser.getSelectedFile();
if (fileChooser.getSelectedFile() != null) {
try {
//reads File as image
image = ImageIO.read(selectedFile);
}
catch (IOException e) {
System.out.println("Invalid image file: " + selectedFile);
System.exit(0);
}
}
else {
System.out.println("No File Selected!");
}
}
public int width() {
//returns width of present image
int width = image.getWidth();
return width;
}
public int height() {
//returns height of present image
int height = image.getHeight();
return height;
}
public void getImage() {
this.image2 = image;
}
public void saveImage() {
//saves current image as JPEG
fileChooser.setDialogTitle("Save this image?");
fileChooser.showSaveDialog(frame);
try {
//writes new file
ImageIO.write(this.image, "JPG", fileChooser.getSelectedFile());
}
catch (IOException f) {
System.out.println("Saving failed! Could not save image.");
}
}
public void show() {
//set frame title, set it visible, etc
content = frame.getContentPane();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
//add the image to the frame
ImageIcon icon = new ImageIcon(image);
imageLabel = new JLabel(icon);
frame.setContentPane(imageLabel);
//add a menubar on the frame with a single option: saving the image
JMenuBar menuBar = new JMenuBar();
frame.setJMenuBar(menuBar);
JMenu progName = new JMenu("Edit Image");
progName.setBackground(Color.RED);
menuBar.add(progName);
JMenu fileMenu = new JMenu("File");
menuBar.add(fileMenu);
JMenu editMenu = new JMenu("Edit");
menuBar.add(editMenu);
ImageIcon exitIcon = new ImageIcon("app-exit.png");
JMenuItem exitAction = new JMenuItem("Exit", exitIcon);
progName.add(exitAction);
exitAction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ImageIcon saveIcon = new ImageIcon("save-icon.png");
int askSave = JOptionPane.showConfirmDialog(null,"Save current image?", "", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, saveIcon);
if (askSave == JOptionPane.YES_OPTION) {
//opens save image method, then exits
saveImage();
System.exit(0);
}
else {
//exits without saving
System.exit(0);
}
}
});
ImageIcon newIcon = new ImageIcon("new-image.png");
JMenuItem newAction = new JMenuItem("Open Image", newIcon);
fileMenu.add(newAction);
newAction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ImageIcon saveIcon = new ImageIcon("save-icon.png");
int askSave = JOptionPane.showConfirmDialog(null,"Save current image?", "", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, saveIcon);
if (askSave == JOptionPane.YES_OPTION) {
//opens save image method, then asks asks for new image file
saveImage();
Picture p = new Picture();
imageLabel.setIcon(new ImageIcon(image));
//resizes canvas to fit new image
frame.setSize(width(), height());
}
else {
//asks for new image file since user did not want to save original
Picture p = new Picture();
imageLabel.setIcon(new ImageIcon(image));
//resizes canvas to fit new image
frame.setSize(width(), height());
}
}
});
ImageIcon saveIcon = new ImageIcon("save-image.png");
JMenuItem saveAction = new JMenuItem("Save Image As...", saveIcon);
fileMenu.add(saveAction);
saveAction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//opens save image method
saveImage();
}
});
ImageIcon gsIcon = new ImageIcon("grayscale-image.png");
JMenuItem grayScale = new JMenuItem("Grayscale", gsIcon);
editMenu.add(grayScale);
grayScale.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//grabs height and width of image, then grayscales it
grayscale(width(), height());
}
});
ImageIcon scaleIcon = new ImageIcon("scale-image.png");
JMenuItem scaleImg = new JMenuItem("Scale Image", scaleIcon);
editMenu.add(scaleImg);
scaleImg.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//asks for height and width to create new image
ImageIcon widthIcon = new ImageIcon("LR-arrows.png");
String scaleWidth = (String)JOptionPane.showInputDialog(null,"What should the new width be?", "", JOptionPane.QUESTION_MESSAGE, widthIcon, null, null);
ImageIcon heightIcon = new ImageIcon("UD-arrows.png");
String scaleHeight = (String)JOptionPane.showInputDialog(null,"What should the new height be?", "", JOptionPane.QUESTION_MESSAGE, widthIcon, null, null);
//turns user input strings into doubles
double x = Double.parseDouble(scaleWidth);
double y = Double.parseDouble(scaleHeight);
//casts doubles as ints
int newWidth = (int)x;
int newHeight = (int)y;
//resizes frame to fit new image dimensions
frame.setSize(newWidth, newHeight);
//calls scale method to resize image using given dimensions
scale(newWidth, newHeight);
}
});
ImageIcon rotateIcon = new ImageIcon("rotate-image.png");
JMenuItem rotateImg = new JMenuItem("Rotate Image", rotateIcon);
editMenu.add(rotateImg);
rotateImg.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
//paint the frame
frame.pack();
frame.repaint();
frame.setVisible(true);
}
// convert to grayscale
public void grayscale(int width, int height) {
// create a grayscale image with original dimensions
image2 = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
// convert colored image to grayscale
ColorConvertOp grayScale = new ColorConvertOp(image.getColorModel().getColorSpace(),image2.getColorModel().getColorSpace(),null);
grayScale.filter(image,image2);
imageLabel.setIcon(new ImageIcon(image2));
getImage();
}
//scales image by a given factor
public void scale(int width, int height){
//uses user-input dimensions to create new image
image2 = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image2.createGraphics();
//gets new dimensions and resizes image
g.drawImage(image, 0, 0, image2.getWidth(), image2.getHeight(), 0, 0, width(), height(), null);
imageLabel.setIcon(new ImageIcon(image2));
getImage();
}
//rotates the image
public void rotate(int width, int height, int theta) {
}
public static void main(String[] args) {
Picture p = new Picture();
p.show();
}
}
1 Answer