public ProjectionHandler getHandler(
ReferencedEnvelope renderingEnvelope,
CoordinateReferenceSystem sourceCrs,
boolean wrap,
int maxWraps)
throws FactoryException {
MapProjection mapProjection =
CRS.getMapProjection(renderingEnvelope.getCoordinateReferenceSystem());
if (renderingEnvelope != null && mapProjection instanceof Mercator) {
ProjectionHandler handler;
double centralMeridian =
mapProjection
.getParameterValues()
.parameter(AbstractProvider.CENTRAL_MERIDIAN.getName().getCode())
.doubleValue();
if (wrap && maxWraps > 0) {
handler =
new WrappingProjectionHandler(
renderingEnvelope, VALID_AREA, sourceCrs, centralMeridian, maxWraps);
} else {
handler = new ProjectionHandler(sourceCrs, VALID_AREA, renderingEnvelope);
handler.setCentralMeridian(centralMeridian);
}
return handler;
}
return null;
}
public ProjectionHandler getHandler(
ReferencedEnvelope renderingEnvelope,
CoordinateReferenceSystem sourceCrs,
boolean wrap,
int maxWraps)
throws FactoryException {
MapProjection mapProjection =
CRS.getMapProjection(renderingEnvelope.getCoordinateReferenceSystem());
if (renderingEnvelope != null && mapProjection instanceof PolarStereographic) {
boolean north;
// variant B uses standard_parallel
ParameterValue<?> stdParallel = null;
try {
stdParallel =
mapProjection
.getParameterValues()
.parameter(AbstractProvider.STANDARD_PARALLEL_1.getName().getCode());
} catch (ParameterNotFoundException e) {
// ignore
}
if (stdParallel != null) {
north = stdParallel.doubleValue() > 0;
} else {
// variant A uses latitude of origin
ParameterValue<?> latOrigin = null;
try {
latOrigin =
mapProjection
.getParameterValues()
.parameter(AbstractProvider.LATITUDE_OF_ORIGIN.getName().getCode());
} catch (ParameterNotFoundException e) {
// ignore
}
if (latOrigin != null) {
north = latOrigin.doubleValue() > 0;
} else {
return null;
}
}
ReferencedEnvelope validArea;
if (north) {
validArea =
new ReferencedEnvelope(
-Double.MAX_VALUE, Double.MAX_VALUE, -0, 90, DefaultGeographicCRS.WGS84);
} else {
validArea =
new ReferencedEnvelope(
-Double.MAX_VALUE, Double.MAX_VALUE, -90, 0, DefaultGeographicCRS.WGS84);
}
return new ProjectionHandler(sourceCrs, validArea, renderingEnvelope) {
@Override
public List<ReferencedEnvelope> getQueryEnvelopes()
throws TransformException, FactoryException {
// check if we are crossing the antimeridian and are fully below the pole,
// in this case we'd end up reading the full globe when we'd have to just
// read two portions near the dateline
if (renderingEnvelope.getMaxY() < 0
&& renderingEnvelope.getMinX() < 0
&& renderingEnvelope.getMaxX() > 0) {
ReferencedEnvelope e1 =
new ReferencedEnvelope(
renderingEnvelope.getMinX(),
-1e-6,
renderingEnvelope.getMinY(),
renderingEnvelope.getMaxY(),
renderingEnvelope.getCoordinateReferenceSystem());
ReferencedEnvelope e2 =
new ReferencedEnvelope(
1e-6,
renderingEnvelope.getMaxX(),
renderingEnvelope.getMinY(),
renderingEnvelope.getMaxY(),
renderingEnvelope.getCoordinateReferenceSystem());
List<ReferencedEnvelope> envelopes = new ArrayList<ReferencedEnvelope>();
envelopes.add(e1);
envelopes.add(e2);
reprojectEnvelopes(sourceCRS, envelopes);
return envelopes;
} else {
return super.getQueryEnvelopes();
}
}
};
}
return null;
}