public void applyAndSync(
Bbox bounds, TileFunction<RasterTile> onDelete, TileFunction<RasterTile> onUpdate) {
MapViewState viewState = rasterLayer.getMapModel().getMapView().getViewState();
boolean panning = lastViewState == null || viewState.isPannableFrom(lastViewState);
if (!panning || isDirty()) {
for (RasterTile tile : tiles.values()) {
onDelete.execute(tile);
}
tiles.clear();
tileBounds = null;
dirty = false;
}
lastViewState = rasterLayer.getMapModel().getMapView().getViewState();
if (tileBounds == null || !tileBounds.contains(bounds)) {
fetchAndUpdateTiles(bounds, onUpdate);
} else {
updateTiles(bounds, onUpdate);
}
}
private void fetchAndUpdateTiles(Bbox bounds, final TileFunction<RasterTile> onUpdate) {
// fetch a bigger area to avoid server requests while panning
tileBounds = bounds.scale(3);
// Calculate tiles
// double scale = lastViewState.getScale();
// addTiles(rasterLayer.getTiles(tileBounds, scale > 1 ? scale : 1 / scale));
addTiles(rasterLayer.getTiles(tileBounds, 1 / lastViewState.getScale()));
Bbox panBounds = worldToPan(bounds);
// for each tile:
for (RasterTile tile : tiles.values()) {
if (panBounds.intersects(tile.getBounds())) {
onUpdate.execute(tile);
}
}
}
private void addTiles(List<org.geomajas.layer.tile.RasterTile> images) {
Matrix t = rasterLayer.getMapModel().getMapView().getWorldToPanTranslation();
Bbox cacheBounds = null;
// flag and reference tile to realign the grid when new tiles come in (transformation shift!)
boolean newTiles = false;
RasterTile referenceTile = null;
for (org.geomajas.layer.tile.RasterTile image : images) {
TileCode code = image.getCode().clone();
if (!tiles.containsKey(code)) {
Bbox panBounds = new Bbox(image.getBounds());
panBounds.translate(Math.round(t.getDx()), Math.round(t.getDy()));
if (cacheBounds == null) {
cacheBounds = panBounds;
} else {
cacheBounds = cacheBounds.union(panBounds);
}
RasterTile tile = new RasterTile(code, panBounds, image.getUrl(), this);
tiles.put(code, tile);
newTiles = true;
referenceTile = tile;
}
}
// This realigns the grid of tiles based on their code
if (newTiles) {
for (RasterTile tile : tiles.values()) {
if (!tile.getCode().equals(referenceTile.getCode())) {
Bbox aligned = new Bbox(referenceTile.getBounds());
aligned.setX(
referenceTile.getBounds().getX()
+ (tile.getCode().getX() - referenceTile.getCode().getX()) * aligned.getWidth());
if (tile.getCode().getY() != referenceTile.getCode().getY()) {
aligned.setY(
referenceTile.getBounds().getY()
+ getOrientedJDiff(referenceTile, tile) * aligned.getHeight());
}
tile.setBounds(aligned);
}
}
}
}
private Bbox worldToPan(Bbox bounds) {
Matrix t = rasterLayer.getMapModel().getMapView().getWorldToPanTransformation();
return bounds.transform(t);
}