LatLon ConventionalCoordinateSystem::coord2latlon(const Coordinate &crdSource) const
{
LatLon ll = _projection->coord2latlon(crdSource);
if (!ll.isValid())
return llUNDEF;
if (abs(ll.Lon()) > 180)
return llUNDEF;
return ll;
}
void SubGridLayer::calcEnvelope(Coordinate& cmin, Coordinate& cmax) const {
cmin = layerManager()->rootLayer()->zoomEnvelope().min_corner();
cmax = layerManager()->rootLayer()->zoomEnvelope().max_corner();
if (!cmin.isValid() || !cmax.isValid())
return;
ICoordinateSystem screenCsy = layerManager()->rootLayer()->screenCsy();
if (!screenCsy.isValid())
return;
if (screenCsy->isUnknown()) // cant do any extra calcs with unknown
return;
bool isLatLon = screenCsy->isLatLon();
if (isLatLon) {
if (cmin.y <= -89)
cmin.y = -89;
if (cmin.x < -180)
cmin.x = -180;
if (cmax.y >= 89)
cmax.y = 89;
if (cmax.x > 180)
cmax.x = 180;
}
else {
LatLon llmin = screenCsy->coord2latlon(cmin);
LatLon llmax = screenCsy->coord2latlon(cmax);
if (llmin.isValid() && llmax.isValid()) {
if (llmin.Lat() <= -85)
cmin.y = screenCsy->latlon2coord(LatLon(-85, llmin.Lon())).y;
if (llmin.Lon() < -180)
cmin.x = screenCsy->latlon2coord(LatLon(llmin.Lat(), -180)).x;
if (llmax.Lat() > 85)
cmax.y = screenCsy->latlon2coord(LatLon(85, llmax.Lon())).y;
if (llmax.Lon() > 180)
cmax.x = screenCsy->latlon2coord(LatLon(llmax.Lat(), 180)).x;
}
}
}
