private RPFImage[] deprojectSouthernDatelineFrames(int frameNumber, BufferedImage frame, PixelTransformer pt)
{
// We have to split this frame at the dateline.
RPFImage[] images = new RPFImage[2];
// Compute a tight bounds for western half...
int minX = pixelColumn(0, frameNumber, this.frameStructure.getPixelRowsPerFrame(),
this.frameStructure.getPolarFrames());
int maxX = pixelColumn(this.frameStructure.getPixelRowsPerFrame(), frameNumber,
this.frameStructure.getPixelRowsPerFrame(), this.frameStructure.getPolarFrames());
int minY = pixelRow(0, frameNumber, this.frameStructure.getPixelRowsPerFrame(),
this.frameStructure.getPolarFrames());
int maxY = pixelRow(this.frameStructure.getPixelRowsPerFrame(), frameNumber,
this.frameStructure.getPixelRowsPerFrame(), this.frameStructure.getPolarFrames());
int midX = (minX + maxX) / 2;
int midY = (minY + maxY) / 2;
// Below we are using knowledge about the frames that make up the lower 1/2 part of the middle
// column, and which borders and edges constitute the extrema...
MinMaxLatLon bndsWest = new MinMaxLatLon();
bndsWest.minLon = -180.;
// center-most frame is different...
if (isCenterFrame(frameNumber))
{
bndsWest.maxLon = 0.;
// here max lat is at center of frame
bndsWest.maxLat = pt.pixel2Latitude(midX, midY, this.frameStructure.getPolarPixelConstant());
// min lat is at an arbitrary corner...
bndsWest.minLat = pt.pixel2Latitude(minX, minY, this.frameStructure.getPolarPixelConstant());
}
else
{
// min lat is one of the lower corners...
bndsWest.minLat = pt.pixel2Latitude(minX, maxY, this.frameStructure.getPolarPixelConstant());
// max lat is center of top edge...
bndsWest.maxLat = pt.pixel2Latitude(midX, minY, this.frameStructure.getPolarPixelConstant());
// UL corner of frame gives us max lon...
bndsWest.maxLon = pt.pixel2Longitude(minX, minY);
}
Sector sector = Sector.fromDegrees(bndsWest.minLat, bndsWest.maxLat, bndsWest.minLon, bndsWest.maxLon);
BufferedImage destImage = new BufferedImage(frame.getWidth(), frame.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
resampleFrameFile(sector, frame, destImage, frameNumber, pt);
images[0] = new RPFImage(sector, destImage);
// East half...
MinMaxLatLon bndsEast = new MinMaxLatLon();
// has same latitude bounds...
bndsEast.minLat = bndsWest.minLat;
bndsEast.maxLat = bndsWest.maxLat;
// max lon is LR corner, unless we're center frame...
if (isCenterFrame(frameNumber))
{
bndsEast.minLon = 0.;
bndsEast.maxLon = 180.;
}
else
{
bndsEast.minLon = pt.pixel2Longitude(maxX, minY);
bndsEast.maxLon = 180.;
}
sector = Sector.fromDegrees(bndsEast.minLat, bndsEast.maxLat, bndsEast.minLon, bndsEast.maxLon);
destImage = new BufferedImage(frame.getWidth(), frame.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
resampleFrameFile(sector, frame, destImage, frameNumber, pt);
images[1] = new RPFImage(sector, destImage);
return(images);
}
public Sector computeFrameCoverage(int frameNumber)
{
int maxFrameNumber = getMaximumFrameNumber();
if (frameNumber < 0 || frameNumber > maxFrameNumber)
{
String message = Logging.getMessage("generic.ArgumentOutOfRange", frameNumber);
Logging.logger().severe(message);
throw new ArgumentException(message);
}
int minX = pixelColumn(0, frameNumber, this.frameStructure.getPixelRowsPerFrame(),
this.frameStructure.getPolarFrames());
int maxY = pixelRow(0, frameNumber, this.frameStructure.getPixelRowsPerFrame(),
this.frameStructure.getPolarFrames());
int maxX = pixelColumn(this.frameStructure.getPixelRowsPerFrame(), frameNumber,
this.frameStructure.getPixelRowsPerFrame(), this.frameStructure.getPolarFrames());
int minY = pixelRow(this.frameStructure.getPixelRowsPerFrame(), frameNumber,
this.frameStructure.getPixelRowsPerFrame(), this.frameStructure.getPolarFrames());
// we'll need these below...
int midX = (minX + maxX) / 2;
int midY = (minY + maxY) / 2;
// Find the bounds. This is kind of tedious...
PixelTransformer pt = (this.zoneCode == '9') ? northernPixels : southernPixels;
MinMaxLatLon bounds = new MinMaxLatLon();
// LL
double lat = pt.pixel2Latitude(minX, minY, this.frameStructure.getPolarPixelConstant());
double lon = pt.pixel2Longitude(minX, minY);
bounds.setMinMax(lat, lon);
// LR
lat = pt.pixel2Latitude(maxX, minY, this.frameStructure.getPolarPixelConstant());
lon = pt.pixel2Longitude(maxX, minY);
bounds.setMinMax(lat, lon);
// UL
lat = pt.pixel2Latitude(minX, maxY, this.frameStructure.getPolarPixelConstant());
lon = pt.pixel2Longitude(minX, maxY);
bounds.setMinMax(lat, lon);
// UR
lat = pt.pixel2Latitude(maxX, maxY, this.frameStructure.getPolarPixelConstant());
lon = pt.pixel2Longitude(maxX, maxY);
bounds.setMinMax(lat, lon);
// middle top
lat = pt.pixel2Latitude(midX, maxY, this.frameStructure.getPolarPixelConstant());
lon = pt.pixel2Longitude(midX, maxY);
bounds.setMinMax(lat, lon);
// middle right
lat = pt.pixel2Latitude(maxX, midY, this.frameStructure.getPolarPixelConstant());
lon = pt.pixel2Longitude(maxX, midY);
bounds.setMinMax(lat, lon);
// middle bottom
lat = pt.pixel2Latitude(midX, minY, this.frameStructure.getPolarPixelConstant());
lon = pt.pixel2Longitude(midX, minY);
bounds.setMinMax(lat, lon);
// middle left
lat = pt.pixel2Latitude(minX, midY, this.frameStructure.getPolarPixelConstant());
lon = pt.pixel2Longitude(minX, midY);
bounds.setMinMax(lat, lon);
// center
lat = pt.pixel2Latitude(midX, midY, this.frameStructure.getPolarPixelConstant());
lon = pt.pixel2Longitude(midX, midY);
bounds.setMinMax(lat, lon);
return(Sector.fromDegrees(bounds.minLat, bounds.maxLat, bounds.minLon, bounds.maxLon));
}