private void writeImage(File imageFile) throws IOException {
BufferedImage resultImage = null;
if (selectedGraph >= 0 && selectedGraph < graphImageFactories.length) {
resultImage =
graphImageFactories[selectedGraph].createGraphImage(
Util.getTime(), sourceIdentifier, null, showMaxCheckBox.isSelected());
}
if (resultImage != null) {
final String format = "png";
BufferedOutputStream imageOutput = null;
try {
imageOutput = new BufferedOutputStream(new FileOutputStream(imageFile));
boolean writerFound = ImageIO.write(resultImage, format, imageOutput);
if (!writerFound) {
String msg = "Couldn't write image! No writer found for format '" + format + "'!";
if (logger.isErrorEnabled()) logger.error(msg);
throw new IOException(msg);
}
} finally {
// close output stream no matter what. shouldn't be necessary...
IOUtilities.closeQuietly(imageOutput);
resultImage.flush();
}
}
}
private void updateGraph() {
if (sourceIdentifier != null
&& selectedGraph >= 0
&& selectedGraph < graphImageFactories.length) {
GraphImageProducer graphImageFactory = graphImageFactories[selectedGraph];
imageToggle[imageIndex] =
graphImageFactory.createGraphImage(
Util.getTime(),
sourceIdentifier,
imageToggle[imageIndex],
showMaxCheckBox.isSelected());
if (imageToggle[imageIndex] != null) {
ImageIcon graphImageIcon = new ImageIcon();
graphImageIcon.setImage(imageToggle[imageIndex]);
graphLabel.setIcon(graphImageIcon);
graphLabel.setText("");
} else {
graphLabel.setIcon(null);
graphLabel.setText("Couldn't create graph image!");
}
if (imageIndex == 0) {
imageIndex = 1;
} else {
imageIndex = 0;
}
graphLabel.repaint();
}
}