/**
* Load the image located at URL.
*
* @param url URL where the image file is located.
* @return loaded image at path or url
* @see java.io.File#toURI()
*/
public static synchronized Image loadImage(URL url) {
Image image = null;
image = Toolkit.getDefaultToolkit().getImage(url);
if (image != null) {
s_tracker.addImage(image, 0);
try {
s_tracker.waitForAll();
} catch (InterruptedException e) {
log.severe("Url= " + url + " - " + e.getMessage());
s_tracker.removeImage(image);
image = null;
} finally {
if (image != null) s_tracker.removeImage(image);
if (s_tracker.isErrorAny()) {
log.severe("Tracker: " + s_tracker.getErrorsAny()[0]);
image = null;
}
if (image != null) {
if (image.getWidth(null) < 0 || image.getHeight(null) < 0) {
log.severe("Image=0");
image = null;
}
}
}
}
return image;
} // loadImage
public static void ensureLoaded(Image img) throws Exception {
// System.err.println("In ensureloaded");
mediatracker.addImage(img, 0);
try {
mediatracker.waitForAll();
if (mediatracker.getErrorsAny() != null) {
mediatracker.removeImage(img);
throw new Exception("Error loading image");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
mediatracker.removeImage(img);
// System.err.println("Out ensureloaded");
}
/**
* Returns a scaled instance of the tile image. Using a MediaTracker instance, this function waits
* until the scaling operation is done.
*
* <p>Internally it caches the scaled image in order to optimize the common case, where the same
* scale is requested as the last time.
*
* @param zo
* @return Image
*/
public Image getScaledImage(double zo) {
Image scaledImage = null;
if (zo == 1.0) {
return getImage();
} else if (zo == zoom && scaledImage != null) {
return scaledImage;
} else {
Image img = getImage();
// System.out.println(getWidth());
if (img != null) {
scaledImage =
img.getScaledInstance(
(int) (getWidth() * zo), (int) (getHeight() * zo), BufferedImage.SCALE_SMOOTH);
MediaTracker mediaTracker = new MediaTracker(new Canvas());
mediaTracker.addImage(scaledImage, 0);
try {
mediaTracker.waitForID(0);
} catch (InterruptedException ie) {
System.err.println(ie);
}
mediaTracker.removeImage(scaledImage);
zoom = zo;
return scaledImage;
}
}
return null;
}
/**
* 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);
}
public void updateScreen() {
boolean olay = false;
int imageSize = 0;
URL url = null;
BufferedInputStream bs = null;
DataInputStream ds = null;
int i = 0;
delay(1000);
String imageName = new String();
imageName = "initial.jpg";
diskWidth = 512;
diskHeight = 512;
x = 0;
y = 0;
if (screenMode != 5) {
olay = true;
read_Overlay(0);
} else {
eraseAll();
olay = false;
}
imageSize = diskWidth * diskHeight;
try {
url = new URL(codebase, imageName);
} catch (MalformedURLException e1) {
System.out.println("URL Error");
}
if (screenMode == 6) // Spectrum
read_Overlay(1);
else if (screenMode == 7) // X-Ray Map
getJpegImage(url, x, y, diskWidth, diskHeight);
else if (screenMode != 9) // All else
readJpegImage(url, x, y, diskWidth, diskHeight);
if (screenMode != 7) // Combine Mem and Overlay except for X-Ray Map
combine_Mem_Olay(screenMode, olay);
MemoryImageSource mis = new MemoryImageSource(512, 512, pixel, 0, 512);
image = createImage(mis);
tracker.addImage(image, 0, 512, 512);
try {
tracker.waitForAll();
} catch (InterruptedException e) {
}
repaint();
tracker.removeImage(image, 0);
}
/** Waits for given image to load. Use before querying image height/width/colors. */
private static void waitForImage(Image image) {
try {
tracker.addImage(image, 0);
tracker.waitForID(0);
tracker.removeImage(image, 0);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private synchronized void waitForImage(java.awt.Image image) {
if (mediaTracker == null) mediaTracker = new MediaTracker(new PdfGraphics2D.FakeComponent());
mediaTracker.addImage(image, 0);
try {
mediaTracker.waitForID(0);
} catch (InterruptedException e) {
// empty on purpose
}
mediaTracker.removeImage(image);
}
/**
* Wait for an image to load.
*
* @param image the image to wait for
*/
protected void waitForImage(Image image) {
int id = ++nextTrackerID;
tracker.addImage(image, id);
try {
tracker.waitForID(id, 0);
} catch (InterruptedException e) {
e.printStackTrace();
}
tracker.removeImage(image, id);
}
public void readJpegImage(URL url, int x, int y, int diskWidth, int diskHeight) {
Image img = null;
PixelGrabber pg = null;
int jpgpix[] = null;
int i, ret;
int index;
boolean results = false;
byte[] image;
byte[] realImage;
DataInputStream gifImage = null;
int count = 0;
Toolkit tk = Toolkit.getDefaultToolkit();
img = tk.getImage(url);
image = new byte[80 * 1024];
try {
gifImage = new DataInputStream(url.openStream());
} catch (IOException e) {
System.out.println("readJpegImage error1");
return;
}
try {
count = gifImage.read(image);
} catch (IOException e) {
System.out.println("readJpegImage error2");
}
realImage = new byte[count];
System.arraycopy(image, 0, realImage, 0, count);
img = tk.createImage(realImage);
realImage = null;
count = 0;
tracker.addImage(img, 0);
try {
tracker.waitForAll();
} catch (InterruptedException e) {
System.out.println("Error wait for image load");
}
jpgpix = new int[diskWidth * diskHeight];
pg = new PixelGrabber(img, 0, 0, diskWidth, diskHeight, jpgpix, 0, diskWidth);
try {
results = pg.grabPixels();
} catch (InterruptedException e) {
System.out.println("Grabbing interrupted " + e);
} catch (Exception e1) {
System.out.println("General exception grabbing " + e1);
}
for (i = 0; i < diskWidth * diskHeight; i++) {
if (diskHeight == 256) index = 512 * y + x + i / 256 * 512 + i % 256;
else index = 512 * y + i;
membuf[index] = jpgpix[i];
pixel[index] = jpgpix[i]; // added 7/15/99
}
tracker.removeImage(img, 0);
try {
gifImage.close();
} catch (IOException e) {
System.out.println("Can't Close gifImage");
}
}