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VPOJAVA.DLL
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IMAGEVIEW
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1998-12-10
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import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.net.URL;
import java.net.MalformedURLException;
import java.awt.MediaTracker;
import java.awt.Component;
public class ImageViewer
extends Canvas
{
private Image image;
private String fileName;
public ImageViewer()
throws MalformedURLException
{
fileName = null;
}
public ImageViewer(String str)
throws MalformedURLException
{
setFileName(str);
}
public ImageViewer(URL url)
{
setURL(url);
}
public ImageViewer(Image img)
{
setImage(img);
}
public void setFileName(String str)
throws MalformedURLException
{
fileName = str;
setURL(new URL(fileName));
}
public String getFileName()
{
return (fileName);
}
public void setURL(URL url)
{
fileName = null;
setImage(getToolkit().getImage(url));
}
public void setImage(Image img)
{
fileName = null;
image = img;
waitForImage(this, image);
}
public void paint(Graphics g)
{
g.drawImage(image, 0, 0, this);
}
public Dimension preferredSize()
{
if (image != null)
return (new Dimension(image.getWidth(this), image.getHeight(this)));
return super.preferredSize();
}
public static void waitForImage(Component c, Image i)
{
MediaTracker tracker;
try
{
tracker = new MediaTracker(c);
tracker.addImage(i, 0);
tracker.waitForID(0);
}
catch(InterruptedException e)
{
}
}
}