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Added a new method : getMetadata() which obtains metadata from GDAL for current raster layer.

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git-svn-id: http://svn.osgeo.org/qgis/trunk@796 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
timlinux 2004-02-11 08:07:24 +00:00
parent b87e644049
commit 2405ab02aa
2 changed files with 72 additions and 12 deletions
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82
src/qgsrasterlayer.cpp
View File

@ -96,13 +96,8 @@ QgsRasterLayer::QgsRasterLayer(QString path, QString baseName)
return;
}
if( gdalDataset->GetGeoTransform( adfGeoTransform ) == CE_None )
{
#ifdef DEBUG
printf( "Origin = (%.6f,%.6f)\n", adfGeoTransform[0], adfGeoTransform[3] );
printf( "Pixel Size = (%.6f,%.6f)\n", adfGeoTransform[1], adfGeoTransform[5] );
#endif
}
//just testing remove this later
getMetadata();
double myXMaxDouble = adfGeoTransform[0] + gdalDataset->GetRasterXSize() * adfGeoTransform[1] +
gdalDataset->GetRasterYSize() * adfGeoTransform[2];
@ -326,6 +321,8 @@ bool QgsRasterLayer::hasBand(QString theBandName)
void QgsRasterLayer::draw(QPainter * theQPainter, QgsRect * theViewExtent, QgsCoordinateTransform * theQgsCoordinateTransform)
{
//Dont waste time drawing if transparency is at 0 (completely transparent)
if (transparencyLevelInt==0) return;
//
// ---------------------------------------------------
//These are typical assignements made in this routine:
@ -602,22 +599,25 @@ void QgsRasterLayer::drawSingleBandGray(QPainter * theQPainter,
int myGrayValInt=myGdalScanData[myColumnInt*theRasterViewPort->drawableAreaXDimInt + myRowInt];
//remove these lines!
//if (myColumnInt==0)
//std::cout << "Checking if " << myGrayValInt << " = " << myRasterBandStats.noDataDouble << std::endl;
//std::cout << "Checking if " << myGrayValInt << " = " << noDataValueDouble << std::endl;
//dont draw this point if it is no data !
if (myGrayValInt != noDataValueDouble)
//gdal should return -9999 when a cell is null, but it seems to return 0 rather
if (myGrayValInt != 0) //noDataValueDouble)
{
// We need to make sure the values are 0-255
myGrayValInt = static_cast<int>((255/myRangeDouble) * myGrayValInt);
if (invertHistogramFlag)
{
myGrayValInt=255-myGrayValInt;
}
myQImage.setPixel( myRowInt, myColumnInt, qRgba( myGrayValInt, myGrayValInt, myGrayValInt, transparencyLevelInt ));
}
else //render no data as 100% transparent
{
//0 alpha = completely transparent
myQImage.setPixel( myRowInt, myColumnInt, qRgba( 255, 255, 255, 0 ));
//myQImage.setPixel( myRowInt, myColumnInt, qRgba( 255, 127, 255, 127 ));
}
}
}
@ -706,7 +706,8 @@ void QgsRasterLayer::drawSingleBandPseudoColor(QPainter * theQPainter, RasterVie
myGreenInt = 255;
int myInt=myGdalScanData[myColumnInt*theRasterViewPort->drawableAreaXDimInt + myRowInt];
// draw this point if it is not no_data !
if (myInt!=noDataValueDouble)
//gdal should return -9999 when a cell is null, but it seems to return 0 rather
if (myInt != noDataValueDouble)
{
//double check that myInt >= min and <= max
//this is relevant if we are plotting within stddevs
@ -771,7 +772,7 @@ void QgsRasterLayer::drawSingleBandPseudoColor(QPainter * theQPainter, RasterVie
else //nodata so draw transparent
{
//0 alpha = completely transparent
myQImage.setPixel( myRowInt, myColumnInt, qRgba( 255, 255, 255, 0 ));
//myQImage.setPixel( myRowInt, myColumnInt, qRgba( 255, 255, 255, 0 ));
}
}//end of columnwise loop
}//end of towwise loop
@ -1939,3 +1940,60 @@ void QgsRasterLayer::initContextMenu(QgisApp *theApp){
popMenu->insertSeparator();
popMenu->insertItem(tr("&Remove"), theApp, SLOT(removeLayer()));
}
QString QgsRasterLayer::getMetadata()
{
QString myMetadataQString = "<html><body>";
myMetadataQString += "<table>";
myMetadataQString += "<tr><td bgcolor=\"gray\">";
myMetadataQString += tr("Driver:");
myMetadataQString += "</td></tr>";
myMetadataQString += "<tr><td bgcolor=\"white\">";
myMetadataQString += QString(gdalDataset->GetDriver()->GetDescription());
myMetadataQString += "<br>";
myMetadataQString += QString(gdalDataset->GetDriver()->GetMetadataItem( GDAL_DMD_LONGNAME )) ;
myMetadataQString += "</td></tr>";
myMetadataQString += "<tr><td bgcolor=\"gray\">";
myMetadataQString += tr("Dimensions:");
myMetadataQString += "</td></tr>";
myMetadataQString += "<tr><td bgcolor=\"white\">";
myMetadataQString += tr("X: ") + QString::number(gdalDataset->GetRasterXSize()) +
tr(" Y: ") + QString::number(gdalDataset->GetRasterYSize()) +
tr(" Bands: ") + QString::number(gdalDataset->GetRasterCount());
myMetadataQString += "</td></tr>";
if( gdalDataset->GetProjectionRef() != NULL )
{
myMetadataQString += "<tr><td bgcolor=\"gray\">";
myMetadataQString += tr("Projection: ");
myMetadataQString += "</td></tr>";
myMetadataQString += "<tr><td bgcolor=\"white\">";
myMetadataQString += QString(gdalDataset->GetProjectionRef() );
myMetadataQString += "</td></tr>";
}
if( gdalDataset->GetGeoTransform( adfGeoTransform ) == CE_None )
{
myMetadataQString += "<tr><td bgcolor=\"gray\">";
myMetadataQString += tr("Origin:");
myMetadataQString += "</td></tr>";
myMetadataQString += "<tr><td bgcolor=\"white\">";
myMetadataQString += QString::number(adfGeoTransform[0] );
myMetadataQString += ",";
myMetadataQString += QString::number(adfGeoTransform[3] );
myMetadataQString += "</td></tr>";
myMetadataQString += "<tr><td bgcolor=\"gray\">";
myMetadataQString += tr("Pixel Size:");
myMetadataQString += "</td></tr>";
myMetadataQString += "<tr><td bgcolor=\"white\">";
myMetadataQString += QString::number(adfGeoTransform[1] );
myMetadataQString += ",";
myMetadataQString += QString::number(adfGeoTransform[5] );
myMetadataQString += "</td></tr>";
}
myMetadataQString += "</table>";
myMetadataQString += "</body></html>";
return myMetadataQString;
}

2
src/qgsrasterlayer.h
View File

@ -651,6 +651,8 @@ public:
QPopupMenu *contextMenu();
/** \brief Emit a signal asking for a repaint. */
void triggerRepaint();
/** \brief Obtain GDAL Metadata for this layer */
QString getMetadata();
private: