/** Get an image based on index numbers */
public BufferedImage getIndexedImage(
int x, int y, int zoom, int cacheZoom, GMapListener listener) {
if (listener != null) {
if (!getGDataSource().isCached(x, y, zoom)) {
listener.updateGMapPainting();
listener.updateGMapMessage(GMap.MESSAGE_DOWNLOADING);
} else {
listener.updateGMapMessage(GMap.MESSAGE_PAINTING);
}
}
BufferedImage thumbImage = getGDataSource().getImage(x, y, zoom, true);
if (thumbImage == null) return defaultImage;
// if we dont have to paint cache, return here
if (cacheZoom == (GPhysicalPoint.MIN_ZOOM - 1) || cacheZoom >= zoom) return thumbImage;
BufferedImage paintedImage =
new BufferedImage(
GDataSource.sourceSize.width,
GDataSource.sourceSize.height,
BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = paintedImage.createGraphics();
graphics2D.drawImage(
thumbImage, 0, 0, GDataSource.sourceSize.width, GDataSource.sourceSize.height, null);
// now lets move to painting the cache
double imageNum = Math.pow(2, zoom - cacheZoom);
// draw cache lines
int startX = (int) (imageNum * x);
int startY = (int) (imageNum * y);
// get composite to restore later, set new transparent composite
Composite originalComposite = graphics2D.getComposite();
graphics2D.setComposite(opacity40);
// draw grid
for (int i = 0; i < imageNum; i++) {
for (int j = 0; j < imageNum; j++) {
// points
Point upperLeft =
new Point(
(int) (GDataSource.sourceSize.width / imageNum) * i,
(int) (GDataSource.sourceSize.height / imageNum) * j);
Dimension size =
new Dimension(
(int) (GDataSource.sourceSize.width / imageNum),
(int) (GDataSource.sourceSize.height / imageNum));
// draw lines
graphics2D.setColor(new Color(100, 100, 100));
graphics2D.drawLine(upperLeft.x, upperLeft.y, upperLeft.x + size.width, upperLeft.y);
graphics2D.drawLine(upperLeft.x, upperLeft.y, upperLeft.x, upperLeft.y + size.height);
// check if file exists
if (getGDataSource().isCached(startX + i, startY + j, cacheZoom))
graphics2D.setColor(Color.RED);
else graphics2D.setColor(new Color(155, 155, 155));
// shade rectangle
graphics2D.fillRect(upperLeft.x, upperLeft.y, size.width, size.height);
}
}
// restore composite
graphics2D.setComposite(originalComposite);
return paintedImage;
}
