QgsRasterRenderer* QgsPalettedRasterRenderer::create( const QDomElement& elem, QgsRasterInterface* input )
{
if ( elem.isNull() )
{
return nullptr;
}
int bandNumber = elem.attribute( QStringLiteral( "band" ), QStringLiteral( "-1" ) ).toInt();
int nColors = 0;
QRgb* colors = nullptr;
QVector<QString> labels;
QDomElement paletteElem = elem.firstChildElement( QStringLiteral( "colorPalette" ) );
if ( !paletteElem.isNull() )
{
QDomNodeList paletteEntries = paletteElem.elementsByTagName( QStringLiteral( "paletteEntry" ) );
QDomElement entryElem;
int value;
nColors = 0;
// We cannot believe that data are correct, check first max value
for ( int i = 0; i < paletteEntries.size(); ++i )
{
entryElem = paletteEntries.at( i ).toElement();
// Could be written as doubles (with .0000) in old project files
value = ( int )entryElem.attribute( QStringLiteral( "value" ), QStringLiteral( "0" ) ).toDouble();
if ( value >= nColors && value <= 10000 ) nColors = value + 1;
}
QgsDebugMsgLevel( QString( "nColors = %1" ).arg( nColors ), 4 );
colors = new QRgb[ nColors ];
for ( int i = 0; i < nColors; ++i )
{
entryElem = paletteEntries.at( i ).toElement();
value = ( int )entryElem.attribute( QStringLiteral( "value" ), QStringLiteral( "0" ) ).toDouble();
QgsDebugMsgLevel( entryElem.attribute( "color", "#000000" ), 4 );
if ( value >= 0 && value < nColors )
{
colors[value] = QColor( entryElem.attribute( QStringLiteral( "color" ), QStringLiteral( "#000000" ) ) ).rgba();
QString label = entryElem.attribute( QStringLiteral( "label" ) );
if ( !label.isEmpty() )
{
if ( value >= labels.size() ) labels.resize( value + 1 );
labels[value] = label;
}
}
else
{
QgsDebugMsg( QString( "value %1 out of range" ).arg( value ) );
}
}
}
QgsPalettedRasterRenderer* r = new QgsPalettedRasterRenderer( input, bandNumber, colors, nColors, labels );
r->readXml( elem );
return r;
}
QgsRasterRenderer *QgsPalettedRasterRenderer::create( const QDomElement &elem, QgsRasterInterface *input )
{
if ( elem.isNull() )
{
return nullptr;
}
int bandNumber = elem.attribute( QStringLiteral( "band" ), QStringLiteral( "-1" ) ).toInt();
ClassData classData;
QDomElement paletteElem = elem.firstChildElement( QStringLiteral( "colorPalette" ) );
if ( !paletteElem.isNull() )
{
QDomNodeList paletteEntries = paletteElem.elementsByTagName( QStringLiteral( "paletteEntry" ) );
QDomElement entryElem;
int value;
for ( int i = 0; i < paletteEntries.size(); ++i )
{
QColor color;
QString label;
entryElem = paletteEntries.at( i ).toElement();
value = static_cast<int>( entryElem.attribute( QStringLiteral( "value" ), QStringLiteral( "0" ) ).toDouble() );
QgsDebugMsgLevel( entryElem.attribute( "color", "#000000" ), 4 );
color = QColor( entryElem.attribute( QStringLiteral( "color" ), QStringLiteral( "#000000" ) ) );
color.setAlpha( entryElem.attribute( QStringLiteral( "alpha" ), QStringLiteral( "255" ) ).toInt() );
label = entryElem.attribute( QStringLiteral( "label" ) );
classData << Class( value, color, label );
}
}
QgsPalettedRasterRenderer *r = new QgsPalettedRasterRenderer( input, bandNumber, classData );
r->readXml( elem );
// try to load color ramp (optional)
QDomElement sourceColorRampElem = elem.firstChildElement( QStringLiteral( "colorramp" ) );
if ( !sourceColorRampElem.isNull() && sourceColorRampElem.attribute( QStringLiteral( "name" ) ) == QLatin1String( "[source]" ) )
{
r->setSourceColorRamp( QgsSymbolLayerUtils::loadColorRamp( sourceColorRampElem ) );
}
return r;
}
