FGFS-4.1/OpenSceneGraph
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Improved support for handling externally set projections

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This commit is contained in:
Robert Osfield
2004-01-29 15:47:06 +00:00
parent 475c583975
commit 965ed49427
3 changed files with 44 additions and 61 deletions
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73
examples/osgdem/DataSet.cpp
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@@ -142,63 +142,10 @@ DataSet::SourceData* DataSet::SourceData::readData(Source* source)
osg::BoundingBox DataSet::SourceData::getExtents(const osgTerrain::CoordinateSystem* cs) const
{
if (_cs==cs) return _extents;
if (_cs.valid() && cs)
{
if (*_cs == *cs) return _extents;
if (_gdalDataSet)
{
//std::cout<<"Projecting bounding volume for "<<_source->getFileName()<<std::endl;
osg::BoundingBox bb;
/* -------------------------------------------------------------------- */
/* Create a transformation object from the source to */
/* destination coordinate system. */
/* -------------------------------------------------------------------- */
void *hTransformArg =
GDALCreateGenImgProjTransformer( _gdalDataSet,_cs->getProjectionRef().c_str(),
NULL, cs->getProjectionRef().c_str(),
TRUE, 0.0, 1 );
if (!hTransformArg)
{
std::cout<<" failed to create transformer"<<std::endl;
return bb;
}
double adfDstGeoTransform[6];
int nPixels=0, nLines=0;
if( GDALSuggestedWarpOutput( _gdalDataSet,
GDALGenImgProjTransform, hTransformArg,
adfDstGeoTransform, &nPixels, &nLines )
!= CE_None )
{
std::cout<<" failed to create warp"<<std::endl;
return bb;
}
osg::Matrixd geoTransform( adfDstGeoTransform[1], adfDstGeoTransform[4], 0.0, 0.0,
adfDstGeoTransform[2], adfDstGeoTransform[5], 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
adfDstGeoTransform[0], adfDstGeoTransform[3], 0.0, 1.0);
GDALDestroyGenImgProjTransformer( hTransformArg );
bb.expandBy( osg::Vec3(0.0,0.0,0.0)*geoTransform);
bb.expandBy( osg::Vec3(nPixels,nLines,0.0)*geoTransform);
return bb;
}
}
std::cout<<"DataSet::DataSource::assuming compatible coordinates."<<std::endl;
return _extents;
return computeSpatialProperties(cs)._extents;
}
const DataSet::SpatialProperties& DataSet::SourceData::computeSpatialProperties(osgTerrain::CoordinateSystem* cs) const
const DataSet::SpatialProperties& DataSet::SourceData::computeSpatialProperties(const osgTerrain::CoordinateSystem* cs) const
{
if (_cs==cs) return *this;
if (_cs.valid() && cs)
@@ -247,7 +194,7 @@ const DataSet::SpatialProperties& DataSet::SourceData::computeSpatialProperties(
sp._numValuesX = nPixels;
sp._numValuesY = nLines;
sp._cs = cs;
sp._cs = const_cast<osgTerrain::CoordinateSystem*>(cs);
sp._geoTransform.set( adfDstGeoTransform[1], adfDstGeoTransform[4], 0.0, 0.0,
adfDstGeoTransform[2], adfDstGeoTransform[5], 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
@@ -428,7 +375,8 @@ void DataSet::SourceData::readHeightField(DestinationData& destination)
else if (!bandSelected && bandGreen) bandSelected = bandGreen;
else if (!bandSelected && bandBlue) bandSelected = bandBlue;
float heightRatio = 1.0/65536;
//float heightRatio = 1.0/65536;
float heightRatio = 1.0;
if (bandSelected)
{
@@ -1906,10 +1854,19 @@ void DataSet::computeDestinationGraphFromSources(unsigned int numLevels)
for(CompositeSource::source_iterator itr(_sourceGraph.get());itr.valid();++itr)
{
SourceData* sd = (*itr)->getSourceData();
if (sd) extents.expandBy(sd->getExtents(_coordinateSystem.get()));
if (sd)
{
osg::BoundingBox local_extents(sd->getExtents(_coordinateSystem.get()));
std::cout<<"local_extents = xMin()"<<local_extents.xMin()<<" "<<local_extents.xMax()<<std::endl;
std::cout<<" yMin()"<<local_extents.yMin()<<" "<<local_extents.yMax()<<std::endl;
extents.expandBy(local_extents);
}
}
}
std::cout<<"extents = xMin()"<<extents.xMin()<<" "<<extents.xMax()<<std::endl;
std::cout<<" yMin()"<<extents.yMin()<<" "<<extents.yMax()<<std::endl;
// then create the destinate graph accordingly.
unsigned int imageSize = 256;