/**
* Select the visible grid elements
*
* @param dc the current <code>DrawContext</code>.
*/
protected void selectRenderables(DrawContext dc) {
if (dc == null) {
String message = Logging.getMessage("nullValue.DrawContextIsNull");
Logging.logger().severe(message);
throw new IllegalArgumentException(message);
}
Sector vs = dc.getVisibleSector();
OrbitView view = (OrbitView) dc.getView();
// Compute labels offset from view center
Position centerPos = view.getCenterPosition();
Double pixelSizeDegrees =
Angle.fromRadians(
view.computePixelSizeAtDistance(view.getZoom())
/ dc.getGlobe().getEquatorialRadius())
.degrees;
Double labelOffsetDegrees = pixelSizeDegrees * view.getViewport().getWidth() / 4;
Position labelPos =
Position.fromDegrees(
centerPos.getLatitude().degrees - labelOffsetDegrees,
centerPos.getLongitude().degrees - labelOffsetDegrees,
0);
Double labelLatDegrees = labelPos.getLatitude().normalizedLatitude().degrees;
labelLatDegrees = Math.min(Math.max(labelLatDegrees, -76), 78);
labelPos =
new Position(
Angle.fromDegrees(labelLatDegrees), labelPos.getLongitude().normalizedLongitude(), 0);
if (vs != null) {
for (GridElement ge : this.gridElements) {
if (ge.isInView(dc)) {
if (ge.renderable instanceof GeographicText) {
GeographicText gt = (GeographicText) ge.renderable;
if (labelPos.getLatitude().degrees < 72
|| "*32*34*36*".indexOf("*" + gt.getText() + "*") == -1) {
// Adjust label position according to eye position
Position pos = gt.getPosition();
if (ge.type.equals(GridElement.TYPE_LATITUDE_LABEL))
pos =
Position.fromDegrees(
pos.getLatitude().degrees,
labelPos.getLongitude().degrees,
pos.getElevation());
else if (ge.type.equals(GridElement.TYPE_LONGITUDE_LABEL))
pos =
Position.fromDegrees(
labelPos.getLatitude().degrees,
pos.getLongitude().degrees,
pos.getElevation());
gt.setPosition(pos);
}
}
this.graticuleSupport.addRenderable(ge.renderable, GRATICULE_UTM);
}
}
// System.out.println("Total elements: " + count + " visible sector: " + vs);
}
}
protected static ArrayList<Position> readReferencePositions(String filePath)
throws FileNotFoundException {
ArrayList<Position> positions = new ArrayList<Position>();
Scanner scanner = new Scanner(new File(filePath));
while (scanner.hasNextDouble()) {
double lat = scanner.nextDouble();
double lon = scanner.nextDouble();
double elevation = scanner.nextDouble();
positions.add(Position.fromDegrees(lat, lon, elevation));
}
return positions;
}
protected static ArrayList<Position> generateReferenceLocations(
Sector sector, int numLats, int numLons) {
ArrayList<Position> locations = new ArrayList<Position>();
double dLat =
(sector.getMaxLatitude().degrees - sector.getMinLatitude().degrees) / (numLats - 1);
double dLon =
(sector.getMaxLongitude().degrees - sector.getMinLongitude().degrees) / (numLons - 1);
for (int j = 0; j < numLats; j++) {
double lat = sector.getMinLatitude().degrees + j * dLat;
for (int i = 0; i < numLons; i++) {
double lon = sector.getMinLongitude().degrees + i * dLon;
// Specify angles to five decimal places.
locations.add(
Position.fromDegrees(
Math.round(lat * 100000.0) / 100000.0, Math.round(lon * 100000.0) / 100000.0, 0));
}
}
return locations;
}
protected List<Position> buildGrid(Sector sector, double height, int nLatCells, int nLonCells) {
List<Position> grid = new ArrayList<Position>((nLatCells + 1) * (nLonCells + 1));
double dLat = sector.getDeltaLatDegrees() / nLatCells;
double dLon = sector.getDeltaLonDegrees() / nLonCells;
for (int j = 0; j <= nLatCells; j++) {
double lat =
j == nLatCells
? sector.getMaxLatitude().degrees
: sector.getMinLatitude().degrees + j * dLat;
for (int i = 0; i <= nLonCells; i++) {
double lon =
i == nLonCells
? sector.getMaxLongitude().degrees
: sector.getMinLongitude().degrees + i * dLon;
grid.add(Position.fromDegrees(lat, lon, height));
}
}
return grid;
}
/** Create the graticule grid elements */
private void createUTMRenderables() {
this.gridElements = new ArrayList<GridElement>();
ArrayList<Position> positions = new ArrayList<Position>();
// Generate meridians and zone labels
int lon = -180;
int zoneNumber = 1;
int maxLat;
for (int i = 0; i < 60; i++) {
Angle longitude = Angle.fromDegrees(lon);
// Meridian
positions.clear();
positions.add(new Position(Angle.fromDegrees(-80), longitude, 10e3));
positions.add(new Position(Angle.fromDegrees(-60), longitude, 10e3));
positions.add(new Position(Angle.fromDegrees(-30), longitude, 10e3));
positions.add(new Position(Angle.ZERO, longitude, 10e3));
positions.add(new Position(Angle.fromDegrees(30), longitude, 10e3));
if (lon < 6 || lon > 36) {
// 'regular' UTM meridians
maxLat = 84;
positions.add(new Position(Angle.fromDegrees(60), longitude, 10e3));
positions.add(new Position(Angle.fromDegrees(maxLat), longitude, 10e3));
} else {
// Exceptions: shorter meridians around and north-east of Norway
if (lon == 6) {
maxLat = 56;
positions.add(new Position(Angle.fromDegrees(maxLat), longitude, 10e3));
} else {
maxLat = 72;
positions.add(new Position(Angle.fromDegrees(60), longitude, 10e3));
positions.add(new Position(Angle.fromDegrees(maxLat), longitude, 10e3));
}
}
Object polyline = createLineRenderable(positions, Polyline.GREAT_CIRCLE);
Sector sector = Sector.fromDegrees(-80, maxLat, lon, lon);
this.gridElements.add(new GridElement(sector, polyline, GridElement.TYPE_LINE));
// Zone label
GeographicText text =
new UserFacingText(zoneNumber + "", Position.fromDegrees(0, lon + 3, 0));
sector = Sector.fromDegrees(-90, 90, lon + 3, lon + 3);
this.gridElements.add(new GridElement(sector, text, GridElement.TYPE_LONGITUDE_LABEL));
// Increase longitude and zone number
lon += 6;
zoneNumber++;
}
// Generate special meridian segments for exceptions around and north-east of Norway
for (int i = 0; i < 5; i++) {
positions.clear();
lon = specialMeridians[i][0];
positions.add(
new Position(Angle.fromDegrees(specialMeridians[i][1]), Angle.fromDegrees(lon), 10e3));
positions.add(
new Position(Angle.fromDegrees(specialMeridians[i][2]), Angle.fromDegrees(lon), 10e3));
Object polyline = createLineRenderable(positions, Polyline.GREAT_CIRCLE);
Sector sector = Sector.fromDegrees(specialMeridians[i][1], specialMeridians[i][2], lon, lon);
this.gridElements.add(new GridElement(sector, polyline, GridElement.TYPE_LINE));
}
// Generate parallels - no exceptions
int lat = -80;
for (int i = 0; i < 21; i++) {
Angle latitude = Angle.fromDegrees(lat);
for (int j = 0; j < 4; j++) {
// Each prallel is divided into four 90 degrees segments
positions.clear();
lon = -180 + j * 90;
positions.add(new Position(latitude, Angle.fromDegrees(lon), 10e3));
positions.add(new Position(latitude, Angle.fromDegrees(lon + 30), 10e3));
positions.add(new Position(latitude, Angle.fromDegrees(lon + 60), 10e3));
positions.add(new Position(latitude, Angle.fromDegrees(lon + 90), 10e3));
Object polyline = createLineRenderable(positions, Polyline.LINEAR);
Sector sector = Sector.fromDegrees(lat, lat, lon, lon + 90);
this.gridElements.add(new GridElement(sector, polyline, GridElement.TYPE_LINE));
}
// Latitude band label
if (i < 20) {
GeographicText text =
new UserFacingText(latBands.charAt(i) + "", Position.fromDegrees(lat + 4, 0, 0));
Sector sector = Sector.fromDegrees(lat + 4, lat + 4, -180, 180);
this.gridElements.add(new GridElement(sector, text, GridElement.TYPE_LATITUDE_LABEL));
}
// Increase latitude
lat += lat < 72 ? 8 : 12;
}
}
protected Position getPosition(int index) {
int latlonIndex = 2 * index;
return Position.fromDegrees(latlonArray[latlonIndex], latlonArray[latlonIndex + 1], 0);
}