Member Avatar for freesoft_2000

Hi everyone,
I am trying to load images in the canvas but it seems nothing gets loaded at all but the program compiles without any errors. It is actually a simple image viewer and have tried almost everything. Anyway here is my program and i hope someone can help me see what i did wrong in my program and show me what i am doing wrong. My program is an application and not an applet.
My e-mail is freesoft_2000@yahoo.com

Here is my program

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;


public class Images implements ActionListener, WindowListener
{


Frame fr = new Frame ("Frame");
Label Label1 = new Label("Label1                                                 ");
Button Button1 = new Button("Button 1");
Canvas Canvas1 = new Canvas();
FileDialog fd = new FileDialog(fr,"Open", FileDialog.LOAD);
Image Image1;


void initialize ()
{
fr.setSize(500,500);
fr.setLocation(300,300);
fr.setBackground(Color.lightGray);
fr.setLayout(new FlowLayout());
fr.add(Label1);
fr.add(Button1);
Canvas1.setSize(1000,1000);
fr.add(Canvas1);
fr.addWindowListener(this);
Button1.addActionListener(this);
fr.show();
}


void imageload ()
{
fd.show();
if(fd.getFile() == null)
{
Label1.setText("You have not chosen any image files yet");
}
else
{
String d = (fd.getDirectory() + fd.getFile());


Toolkit toolkit = Toolkit.getDefaultToolkit();
Image1 = toolkit.getImage(d);
}
}


public void paint(Graphics g)
{
g.drawImage(Image1, 0, 0, 1000, 1000, Canvas1);
}



public void windowClosing(WindowEvent e)
{


// Use fr.hide(); for subsequent forms in multi form applications


System.exit(0);
}


public void windowActivated(WindowEvent e)
{
}
public void windowClosed(WindowEvent e)
{
}
public void windowDeactivated(WindowEvent e)
{
}
public void windowDeiconified(WindowEvent e)
{
}
public void windowIconified(WindowEvent e)
{
}
public void windowOpened(WindowEvent e)
{
}


public void actionPerformed(ActionEvent event)


{
Button b = (Button)event.getSource();


if(b == Button1)
{
imageload();
}


}


public static void main(String args[])
{
Images a = new Images();
a.initialize();
}
}

I apologize for the length of the program in advance

Thank You

Yours Sincerely

Richard West

Edited by Nick Evan because: Fixed formatting
  • 2 Contributors
  • 1 Reply
  • 801 Views
  • 12 Hours Discussion Span
  • Latest Post Latest Post by hivework
Member Avatar for hivework

You see, the paint() method/event that you have "overidden" will never be "dispatched" in your program, because it is a member function of your Images class which does not extend any graphical components.

To solve this problem, I have added MyCanvas class which overrides the paint() event. So instead of adding the Canvas component to the application window, I added MyCanvas, which will respond to each paint event and draw the image.

Here is the code:

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
class MyCanvas extends Canvas
{
Image img;
 public MyCanvas(Image img)
 {
  this.img = img;
 }
 public void paint (Graphics g)
 {
  if (img != null)
  {
  g.drawImage(img, 0, 0, 1000, 1000, this);
  }
 }
 public void setImage (Image img){
  this.img = img;
 }
 
}
public class Images implements ActionListener, WindowListener 
{
Frame fr = new Frame ("Frame");
Label Label1 = new Label("Label1 ");
Button Button1 = new Button("Button 1");
Image Image1;
MyCanvas Canvas1;
FileDialog fd = new FileDialog(fr,"Open", FileDialog.LOAD);

void initialize ()
{ 
fr.setSize(500,500);
fr.setLocation(300,300);
fr.setBackground(Color.lightGray);
fr.setLayout(new FlowLayout());
fr.add(Label1);
fr.add(Button1);
fr.addWindowListener(this);
Button1.addActionListener(this);
Canvas1 = new MyCanvas(null);
Canvas1.setSize(1000,1000);
fr.add(Canvas1);
fr.show();
}
void imageload () 
{
fd.show();
if(fd.getFile() == null)
{ 
Label1.setText("You have not chosen any image files yet");
}
else
{
String d = (fd.getDirectory() + fd.getFile());
Toolkit toolkit = Toolkit.getDefaultToolkit();
Image1 = toolkit.getImage(d);
Canvas1.setImage(Image1);
Canvas1.repaint();
} 
}

public void windowClosing(WindowEvent e)
{
// Use fr.hide(); for subsequent forms in multi form applications
System.exit(0); 
}
public void windowActivated(WindowEvent e)
{
}
public void windowClosed(WindowEvent e)
{
}
public void windowDeactivated(WindowEvent e)
{
}
public void windowDeiconified(WindowEvent e)
{
}
public void windowIconified(WindowEvent e)
{
}
public void windowOpened(WindowEvent e)
{
}
public void actionPerformed(ActionEvent event)
{
Button b = (Button)event.getSource();
if(b == Button1) 
{
imageload();
}
} 
public static void main(String args[])
{
Images a = new Images(); 
a.initialize();
} 
}
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