/**
* Get the image associated with the given location string. If the image has already been loaded,
* it simply will return the image, otherwise it will load it from the specified location.
*
* <p>The imageLocation argument must be a valid resource string pointing to either (a) a valid
* URL, (b) a file on the classpath, or (c) a file on the local filesystem. The location will be
* resolved in that order.
*
* @param imageLocation the image location as a resource string.
* @return the corresponding image, if available
*/
public Image getImage(String imageLocation) {
Image image = (Image) imageCache.get(imageLocation);
if (image == null && !loadMap.containsKey(imageLocation)) {
URL imageURL = IOLib.urlFromString(imageLocation);
if (imageURL == null) {
System.err.println("Null image: " + imageLocation);
return null;
}
image = Toolkit.getDefaultToolkit().createImage(imageURL);
// if set for synchronous mode, block for image to load.
if (!m_asynch) {
waitForImage(image);
addImage(imageLocation, image);
} else {
int id = ++nextTrackerID;
tracker.addImage(image, id);
loadMap.put(imageLocation, new LoadMapEntry(id, image));
}
} else if (image == null && loadMap.containsKey(imageLocation)) {
LoadMapEntry entry = (LoadMapEntry) loadMap.get(imageLocation);
if (tracker.checkID(entry.id, true)) {
addImage(imageLocation, entry.image);
loadMap.remove(imageLocation);
tracker.removeImage(entry.image, entry.id);
}
} else {
return image;
}
return (Image) imageCache.get(imageLocation);
}
/**
* Shows the image export dialog and processes the results.
*
* @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
*/
public void actionPerformed(ActionEvent evt) {
// lazy initialization
if (chooser == null) init();
// open image save dialog
File f = null;
scaler.setImage(display.getOffscreenBuffer());
int returnVal = chooser.showSaveDialog(display);
if (returnVal == JFileChooser.APPROVE_OPTION) {
f = chooser.getSelectedFile();
} else {
return;
}
String format = ((SimpleFileFilter) chooser.getFileFilter()).getExtension();
String ext = IOLib.getExtension(f);
if (!format.equals(ext)) {
f = new File(f.toString() + "." + format);
}
double scale = scaler.getScale();
// save image
boolean success = false;
try {
OutputStream out = new BufferedOutputStream(new FileOutputStream(f));
System.out.print("Saving image " + f.getName() + ", " + format + " format...");
success = display.saveImage(out, format, scale);
out.flush();
out.close();
System.out.println("\tDONE");
} catch (Exception e) {
success = false;
}
// show result dialog on failure
if (!success) {
JOptionPane.showMessageDialog(
display, "Error Saving Image!", "Image Save Error", JOptionPane.ERROR_MESSAGE);
}
}