/** Free the memory of the image cache */
public void close() {
ecwFile.close(true);
}
/**
* read part from ECW-file which falls within env and return this part as BufferedImage with
* dimenions width and height
*
* @param env bounding box in world coordinates of requested part
* @param width width of the returned image
* @param height height of the returned image
*/
public BufferedImage getBufferedImage(Envelope env, int width, int height) throws JNCSException {
int bandlist[];
int line, pRGBArray[] = null;
// Setup the view parameters for the ecw file.
bandlist = new int[ecwFile.numBands];
for (int i = 0; i < ecwFile.numBands; i++) {
bandlist[i] = i;
}
// Check if the envelope is within the area of the ecw-image
double dWorldTLX = env.getMin().getX();
double dWorldTLY = env.getMax().getY();
LOG.logDebug("tlx: " + dWorldTLX + " tly: " + dWorldTLY);
if (dWorldTLX < ecwFile.originX) dWorldTLX = ecwFile.originX;
if (dWorldTLY > ecwFile.originY) dWorldTLY = ecwFile.originY;
double dWorldBRX = env.getMax().getX();
double dWorldBRY = env.getMin().getY();
LOG.logDebug("brx: " + dWorldBRX + " bry: " + dWorldBRY);
if (dWorldBRX > (ecwFile.originX + ((ecwFile.width - 1) * ecwFile.cellIncrementX))) // Huh?
// ECW
// does
// not
// except
// the
// full
// width
dWorldBRX = ecwFile.originX + ((ecwFile.width - 1) * ecwFile.cellIncrementX);
if (dWorldBRY
< (ecwFile.originY
+ (ecwFile.height * ecwFile.cellIncrementY)
- (ecwFile.cellIncrementY / 2)))
dWorldBRY =
ecwFile.originY
+ (ecwFile.height * ecwFile.cellIncrementY)
- (ecwFile.cellIncrementY / 2);
// Work out the correct aspect for the setView call.
// double dEnvAspect = (dWorldBRX - dWorldTLX) / (dWorldTLY - dWorldBRY);
// double dImgAspect = (double) width / (double) height;
LOG.logDebug("tlx: " + dWorldTLX + " tly: " + dWorldTLY);
LOG.logDebug("brx: " + dWorldBRX + " bry: " + dWorldBRY);
LOG.logDebug("width: " + width + " height: " + height);
int nDatasetTLX = (int) Math.round((dWorldTLX - ecwFile.originX) / ecwFile.cellIncrementX);
int nDatasetTLY = (int) Math.round((dWorldTLY - ecwFile.originY) / ecwFile.cellIncrementY);
LOG.logDebug("ptlx: " + nDatasetTLX + " ptly: " + nDatasetTLY);
int nDatasetBRX = (int) Math.round((dWorldBRX - ecwFile.originX) / ecwFile.cellIncrementX);
int nDatasetBRY = (int) Math.round((dWorldBRY - ecwFile.originY) / ecwFile.cellIncrementY);
LOG.logDebug("pbrx: " + nDatasetBRX + " pbry: " + nDatasetBRY);
if (nDatasetBRX > (ecwFile.width - 1)) nDatasetBRX = ecwFile.width - 1;
if (nDatasetBRY > (ecwFile.height - 1)) nDatasetBRY = ecwFile.height - 1;
LOG.logDebug("pbrx: " + nDatasetBRX + " pbry: " + nDatasetBRY);
// Check for supersampling
int viewWidth = width;
int viewHeight = height;
if ((nDatasetBRX - nDatasetTLX) < viewWidth || (nDatasetBRY - nDatasetTLY) < viewHeight) {
viewWidth = nDatasetBRX - nDatasetTLX;
viewHeight = nDatasetBRY - nDatasetTLY;
}
if (viewWidth == 0) viewWidth = 1;
if (viewHeight == 0) viewHeight = 1;
LOG.logDebug("Width: " + width + " Height: " + height);
LOG.logDebug("viewWidth: " + viewWidth + " viewHeight: " + viewHeight);
// Create an image of the ecw file.
BufferedImage ecwImage = new BufferedImage(viewWidth, viewHeight, BufferedImage.TYPE_INT_RGB);
pRGBArray = new int[width];
// Set the view
ecwFile.setView(
ecwFile.numBands,
bandlist,
nDatasetTLX,
nDatasetTLY,
nDatasetBRX,
nDatasetBRY,
viewWidth,
viewHeight);
// Read the scan lines
for (line = 0; line < viewHeight; line++) {
ecwFile.readLineRGBA(pRGBArray);
ecwImage.setRGB(0, line, viewWidth, 1, pRGBArray, 0, viewWidth);
}
if (width != viewWidth || height != viewHeight) {
LOG.logDebug("enlarge image");
BufferedImage enlargedImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = enlargedImg.getGraphics();
g.drawImage(ecwImage, 0, 0, width, height, 0, 0, viewWidth, viewHeight, null);
ecwImage = enlargedImg;
g.dispose();
}
return ecwImage;
}