private static AffineTransform createTransform(Sector source, MeshCoords destination) {
java.awt.geom.AffineTransform transform = new java.awt.geom.AffineTransform();
transform.translate(destination.left, destination.bottom);
transform.scale(
(destination.right - destination.left) / source.getDeltaLonDegrees(),
(destination.top - destination.bottom) / source.getDeltaLatDegrees());
transform.translate(-source.getMinLongitude().degrees, -source.getMinLatitude().degrees);
return transform;
}
protected static boolean isSectorVisible(
DrawContext dc, Sector sector, double minDistanceSquared, double maxDistanceSquared) {
View view = dc.getView();
Position eyePos = view.getEyePosition();
if (eyePos == null) return false;
Angle lat = clampAngle(eyePos.getLatitude(), sector.getMinLatitude(), sector.getMaxLatitude());
Angle lon =
clampAngle(eyePos.getLongitude(), sector.getMinLongitude(), sector.getMaxLongitude());
Vec4 p = dc.getGlobe().computePointFromPosition(lat, lon, 0d);
double distSquared = dc.getView().getEyePoint().distanceToSquared3(p);
//noinspection RedundantIfStatement
if (minDistanceSquared > distSquared || maxDistanceSquared < distSquared) return false;
return true;
}
private static MeshCoords transformSector(AffineTransform transform, Sector sector) {
java.awt.geom.Point2D p = new java.awt.geom.Point2D.Double();
java.awt.geom.Point2D ll = new java.awt.geom.Point2D.Double();
java.awt.geom.Point2D ur = new java.awt.geom.Point2D.Double();
p.setLocation(sector.getMinLongitude().degrees, sector.getMinLatitude().degrees);
transform.transform(p, ll);
p.setLocation(sector.getMaxLongitude().degrees, sector.getMaxLatitude().degrees);
transform.transform(p, ur);
return new MeshCoords(
(float) ur.getY(), // Top
(float) ll.getX(), // Left
(float) ll.getY(), // Bottom
(float) ur.getX()); // Right
}
private static MeshTile[] createTiles(LevelSet levelSet, int levelNumber, MeshCoords coords) {
Sector sector = levelSet.getSector();
Level level = levelSet.getLevel(levelNumber);
Angle dLat = level.getTileDelta().getLatitude();
Angle dLon = level.getTileDelta().getLongitude();
Angle latOrigin = levelSet.getTileOrigin().getLatitude();
Angle lonOrigin = levelSet.getTileOrigin().getLongitude();
// Determine the row and column offset from the common World Wind global tiling origin.
int firstRow = Tile.computeRow(dLat, sector.getMinLatitude(), latOrigin);
int firstCol = Tile.computeColumn(dLon, sector.getMinLongitude(), lonOrigin);
int lastRow = Tile.computeRow(dLat, sector.getMaxLatitude(), latOrigin);
int lastCol = Tile.computeColumn(dLon, sector.getMaxLongitude(), lonOrigin);
int numLatTiles = lastRow - firstRow + 1;
int numLonTiles = lastCol - firstCol + 1;
AffineTransform sectorTransform = createTransform(sector, coords);
MeshTile[] tiles = new MeshTile[numLatTiles * numLonTiles];
int index = 0;
Angle p1 = Tile.computeRowLatitude(firstRow, dLat, latOrigin);
for (int row = firstRow; row <= lastRow; row++) {
Angle p2 = p1.add(dLat);
Angle t1 = Tile.computeColumnLongitude(firstCol, dLon, lonOrigin);
for (int col = firstCol; col <= lastCol; col++) {
Angle t2 = t1.add(dLon);
Sector tileSector = new Sector(p1, p2, t1, t2);
MeshCoords tileCoords = transformSector(sectorTransform, tileSector);
tiles[index++] = new MeshTile(tileSector, level, row, col, tileCoords);
t1 = t2;
}
p1 = p2;
}
return tiles;
}
protected boolean isNavSectorVisible(
DrawContext dc, double minDistanceSquared, double maxDistanceSquared) {
if (!navSector.intersects(dc.getVisibleSector())) return false;
View view = dc.getView();
Position eyePos = view.getEyePosition();
if (eyePos == null) return false;
// check for eyePos over globe
if (Double.isNaN(eyePos.getLatitude().getDegrees())
|| Double.isNaN(eyePos.getLongitude().getDegrees())) return false;
Angle lat =
clampAngle(eyePos.getLatitude(), navSector.getMinLatitude(), navSector.getMaxLatitude());
Angle lon =
clampAngle(
eyePos.getLongitude(), navSector.getMinLongitude(), navSector.getMaxLongitude());
Vec4 p = dc.getGlobe().computePointFromPosition(lat, lon, 0d);
double distSquared = dc.getView().getEyePoint().distanceToSquared3(p);
//noinspection RedundantIfStatement
if (minDistanceSquared > distSquared || maxDistanceSquared < distSquared) return false;
return true;
}